Java is a versatile, object-oriented programming language that is widely used for software development across various industries. Java Developers can help clients create anything from complex web applications to automated trading bots and mobile apps. With their advanced skills and knowledge, they can turn your vision into reality, providing you with tailored solutions that align with your business goals. Here are some recent projects that our expert Java Developers made real:

  • Developing custom GUIs for existing codebases
  • Creating encrypted, secure crypto apps
  • Designing cross-platform audio merging tools for mobile devices
  • Building sophisticated trading bots for the cryptocurrency market
  • Implementing open-source virtual machines in C
  • Collaborating as senior developers on large-scale Android projects
  • Solving server request errors for mobile applications
  • Running and optimizing code from Git repositories
  • Designing and implementing web services for seamless integration

Hiring Java Developers on Freelancer.com gives you access to a global pool of talented professionals who can deliver high-quality solutions tailored to your needs. Our platform makes it easy and convenient to find, hire, and collaborate with skilled Java experts from around the world. So why wait? Bring your ideas to life by posting your own project and hiring a Java Developer on Freelancer.com today!

Sur 243,198 commentaires, les clients ont évalué nos Java Developers 4.9 sur 5 étoiles.
Embaucher des Java Developers

Java is a versatile, object-oriented programming language that is widely used for software development across various industries. Java Developers can help clients create anything from complex web applications to automated trading bots and mobile apps. With their advanced skills and knowledge, they can turn your vision into reality, providing you with tailored solutions that align with your business goals. Here are some recent projects that our expert Java Developers made real:

  • Developing custom GUIs for existing codebases
  • Creating encrypted, secure crypto apps
  • Designing cross-platform audio merging tools for mobile devices
  • Building sophisticated trading bots for the cryptocurrency market
  • Implementing open-source virtual machines in C
  • Collaborating as senior developers on large-scale Android projects
  • Solving server request errors for mobile applications
  • Running and optimizing code from Git repositories
  • Designing and implementing web services for seamless integration

Hiring Java Developers on Freelancer.com gives you access to a global pool of talented professionals who can deliver high-quality solutions tailored to your needs. Our platform makes it easy and convenient to find, hire, and collaborate with skilled Java experts from around the world. So why wait? Bring your ideas to life by posting your own project and hiring a Java Developer on Freelancer.com today!

Sur 243,198 commentaires, les clients ont évalué nos Java Developers 4.9 sur 5 étoiles.
Embaucher des Java Developers

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    90 missions trouvées

    I need an AI-driven solution that can automatically take multiple-choice quizzes on my behalf. The system should read each question, evaluate the provided options, and select the most probable correct answer without human intervention. My main interest is the automation of the quiz-taking process itself, not the generation of new questions. If you have built similar bots, scripts, or machine-learning models for assessment platforms, please let me know how your past experience aligns with this task. I’m open to the underlying technology—Python with Selenium or Playwright, headless browser automations, or a custom model—so long as it consistently submits accurate answers and can be adapted to different quiz interfaces. Key deliverable: a working, documented solution I can...

    €14 - €114
    €14 - €114
    0 offres

    I need a Telegram OTP bot integrated with Asterisk that includes a Caller ID feature. Key Requirements: - The bot should send and verify OTPs, as well as log OTP requests. - The Caller ID feature should display incoming caller numbers on just one device. Ideal Skills and Experience: - Experience with Asterisk and Telegram bot development - Familiarity with OTP generation and verification - Knowledge in implementing Caller ID functionalities

    €819 Average bid
    €819 Offre moyenne
    92 offres

    I’m looking for a streamlined way to reach new finance professionals on LinkedIn without living in my browser all day. The end-goal is simple: • Automatically send personalised connection requests to prospects who clearly sit inside the Finance industry. • Once they accept, trigger a short, customisable follow-up message sequence—ideally with delays I can tweak. Please build a small, reliable solution that can pull Finance-related profiles (for example via Sales Navigator filters, CSV uploads, or another compliant method), queue the invitations, and then handle the post-accept messaging. I’m open to your favourite stack—Python + Selenium, Puppeteer, PhantomBuster, or a SaaS you already trust—so long as it respects LinkedIn limits and keeps my...

    €62 Average bid
    €62 Offre moyenne
    45 offres

    ## Project Title **AI + Node.js Developer Required for Ecommerce Platform** ### Project Overview We are looking for an experienced **AI + Node.js developer** to build and enhance a modern, scalable **ecommerce platform**. The developer should have strong experience with Node.js, ecommerce APIs, databases, AI integrations, and third-party services. ### Key Responsibilities * Develop a scalable ecommerce backend using **Node.js** * Build secure REST APIs / APIs for frontend and mobile applications * Integrate AI features such as: * AI product recommendations * AI-based search * Product/content generation * Customer support chatbot * Personalized shopping experience * Develop product, category, cart, checkout and order management systems * Integrate payment gateways * Integrat...

    €979 Average bid
    €979 Offre moyenne
    182 offres

    Description: We are looking for knowledgeable CS professionals, recent graduates, or students to join our platform as subject experts on a flexible, part time basis. What you'll do: Help students learn CS topics and resolve academic doubts through short on demand sessions Optionally conduct technical mock interviews for students preparing for placements. Subjects needed: Python, Java, DSA, DBMS, AI/ML, CN, OS, Cloud Computing, Spring Boot, C++, OOPS — and any other CS subject you're strong in. Who can apply: Students, recent graduates, or working professionals Strong knowledge in at least one CS subject Good communication skills and ability to explain concepts clearly Reliable internet and a device with camera What you get: Flexible working hours — your time, ...

    €1 / hr Average bid
    €1 / hr Offre moyenne
    8 offres

    Necesito un mod para Java Fabric 26.1.2 que añada un nuevo “Trial Spawner” únicamente obtenible en creativo. Al colocarlo, quiero que se pueda abrir un menú interactivo (usable solo en modo creativo) con las siguientes funciones: • Seleccionar tipo de mobs (solo mobs estándar por ahora). • Configurar el loot entregado al jugador (permitir definir objetos personalizados). • Ajustar la frecuencia de spawn. El spawner debe recordar su configuración individualmente y comportarse como un bloque vanilla: activa cuando hay jugadores cerca, consume la lista de mobs indicada y reparte el loot configurado al morir cada oleada. La interfaz debe ser clara, con pestañas o botones para cada sección, y bloquearse completame...

    €38 Average bid
    €38 Offre moyenne
    13 offres

    Necesito un mod para Java Fabric 26.1.2 que añada un nuevo “Trial Spawner” únicamente obtenible en creativo. Al colocarlo, quiero que se pueda abrir un menú interactivo (usable solo en modo creativo) con las siguientes funciones: • Seleccionar tipo de mobs (solo mobs estándar por ahora). • Configurar el loot entregado al jugador (permitir definir objetos personalizados). • Ajustar la frecuencia de spawn. El spawner debe recordar su configuración individualmente y comportarse como un bloque vanilla: activa cuando hay jugadores cerca, consume la lista de mobs indicada y reparte el loot configurado al morir cada oleada. La interfaz debe ser clara, con pestañas o botones para cada sección, y bloquearse completame...

    €98 Average bid
    €98 Offre moyenne
    26 offres
    Logo design
    6 jours left

    Build a full-featured voice chat application that runs smoothly on Android and ships with the complete source code. Core features to implement • Phone-number verification as the only login method, followed by secure session handling. • User profiles that can be expanded later (start with photo, name, bio, interests). • Public chat rooms with high-quality, low-latency voice. • One-to-one private voice calls plus real-time text messaging. • Push notifications for invites, messages, follow requests, wallet events, and admin broadcasts. • In-app wallet able to hold balances, process top-ups, and trigger withdrawal requests; history must be visible to the user and editable from the back office. • Web-based admin panel to manage users, rooms, trans...

    €422 Average bid
    €422 Offre moyenne
    90 offres

    The project involves building a native Android application from the ground up. I already clarified that the scope is specifically Mobile app development and, at this stage, I want to target Android only. Key needs • A clean, intuitive user interface that follows current Android design guidelines. • Robust, well-structured Kotlin or Java code (whichever you are most comfortable with) that is easy to maintain and extend. • All standard mobile essentials: responsive layouts for multiple screen sizes, offline handling where appropriate, and thoughtful permission management. • End-to-end support—planning, UI/UX, coding, testing, and a guided hand-off for Google Play deployment. Deliverables 1. Full Android Studio project with readable source code. 2. Sign...

    €239 Average bid
    €239 Offre moyenne
    85 offres

    Low-Code BPM Governance & Approval Workflow POC – Professional Enterprise UI We are looking for an experienced BPM / BPMS / Low-Code developer to build a Proof of Concept for a Governance & Approval Workflow Platform. The core workflow is: Submission → EXO Review → Committee Review → Board Review → Decision → Minutes Verification → Audit We are specifically looking for a solution that can deliver as much functionality as possible through an existing low-code/BPMS platform, with minimal custom development. PLATFORM We are open to platforms such as: - Joget - Bonita - Flowable - ProcessMaker - Other suitable open-source or self-hosted BPMS platforms You should recommend the platform you believe is best suited for this requirement and explai...

    €1843 Average bid
    €1843 Offre moyenne
    128 offres

    My latest build was rejected for “Unclear ads/offers: Ads or in-app purchase offers aren’t clearly different from your app’s content.” Google has already sent me detailed policy feedback with screenshots and exact paragraphs they believe I am violating. I need a specialist who can: • Analyse the Play Console report and the current APK/AAB to pinpoint every element Google flagged. • Modify the layouts, labels or flow so that banner, interstitial or native spots are unmistakably identified as ads/IAP and never mimic gameplay or menu assets. • Re-compile and test the updated build in Android Studio with the Google Mobile Ads SDK to be sure no new policy issues are introduced. • Prepare the final, signed AAB together with a short change log...

    €23 Average bid
    €23 Offre moyenne
    21 offres

    Saya ingin membuat sebuah aplikasi mobile khusus untuk platform Android. Fokus utama tahap awal ini adalah mendapatkan versi dasar yang sudah bisa dijalankan agar ide aplikasi dapat segera diuji. Lingkup kerja yang saya harapkan: • Menyusun arsitektur proyek di Android Studio (Java atau Kotlin). • Mendesain wireframe sederhana untuk alur layar utama. • Membangun prototipe fungsional dengan setidaknya dua layar yang saling terhubung. • Menyiapkan dokumentasi singkat tentang struktur kode dan langkah build + install ke perangkat. Harap lampirkan file source code lengkap, APK debug, dan panduan setup singkat saat pengiriman.

    €43 / hr Average bid
    €43 / hr Offre moyenne
    3 offres

    We are looking for an experienced Lead Architect/Developer with a minimum of 10+ years in Java, Angular UI, database management, and enterprise application architecture. The role requires strong technical expertise as well as leadership experience to guide development teams and deliver scalable and high-performance applications. Key Responsibilities: - Lead the design and implementation of end-to-end enterprise software architecture for web applications. - Oversee backend development using Java, Spring Boot, Spring Security, JPA/Hibernate, and RESTful APIs. - Direct frontend development leveraging Angular, TypeScript, HTML5, CSS3, and modern frameworks. - Design efficient database schemas and optimized data models from business requirements. - Create architecture documents and technical s...

    €639 Average bid
    €639 Offre moyenne
    105 offres

    I already have a working macro script, but it only fires when Spiritvale is the active window. I want the same logic rebuilt or wrapped so it keeps sending its keyboard-and-mouse events while the game is minimized or running in the background. The game client must remain fully playable and stable, with no noticeable performance hit or crash risk. You can choose any language you’re comfortable with—Python, C++, Java, even a mixed approach—so long as the final build runs on Windows 10/11 without extra installs. An internal DLL plus a lightweight injector, or an external overlay that hooks the game process, are both acceptable; pick whichever you can deliver most reliably. Please show me past work that proves you have done input emulation, DLL injection, botting tools, or ...

    €117 Average bid
    €117 Offre moyenne
    92 offres

    I am looking for an experienced hackathon professional/technical/student consultant to work with me for 5–6 days on a Cognizant non-hackathon/solution challenge. What I Need Help With: * Understanding and analyzing the given problem statement * Designing a proper, practical, and innovative solution * Backend architecture and system design * Helping with Java/Spring Boot backend planning and implementation * AI integration/AI-based solution approach where required * Defining the overall technical architecture and project flow * Preparing a professional PPT/presentation * Preparing the required project report/documentation * Helping prepare the solution for evaluation/presentation * Providing guidance throughout the 5–6 day development period Ideal Candidate: * Has previous h...

    €12 Average bid
    €12 Offre moyenne
    11 offres

    I need a senior-level programmer to build a bootable Android virtual phone image that mirrors the experience of a physical device while running entirely inside a host system (similar in spirit to VMOS). Core requirements • The virtual environment must present itself as a standard Android handset. • Google Play Store has to work out of the box, and I must be able to install any additional APKs of my choice. Internet browsing is not critical; the focus is on app execution. • Instead of a live camera feed the system should expose a video carousel: a predefined folder of clips that loop automatically, appearing to any app as if they were coming from the camera. • The host environment must stay hidden so installed apps treat the image as genuine hardware—no...

    €1766 Average bid
    €1766 Offre moyenne
    119 offres
    Automation Software Development
    5 jours left
    Vérifié

    Looking for Automation developer who has experince in phyton and exe file.

    €58 Average bid
    €58 Offre moyenne
    65 offres

    I have a game idea planned out for a Roblox game however I am clueless on coding and how studio works as a whole I have attempted a little too many times now to bring my game to life and wondering if there is anyone/team out there that is willing to help in this project.

    €197 Average bid
    €197 Offre moyenne
    66 offres

    I'm looking to develop a simple yet efficient Android application for printing lab certificates on card size using my printer. The application should be user-friendly and encompass essential features for seamless operation. Key Features: - Certificate Template Selection: The app should provide various templates for different types of certificates. - Database of Certificate Entries: A built-in database to keep track of all certificate entries, making it easy to print duplicates or track issued certificates. -Printing Preview: A feature that allows users to preview the print before actually printing, ensuring accuracy and saving resources. User Interaction: The application should be designed for manual data entry within the app. Users should be able to input data for the certificates ...

    €80 Average bid
    €80 Offre moyenne
    66 offres

    I’m wrapping up a secure communication app built on a Java Spring Boot back-end with a React front-end and a companion Android client. The remaining work is focused on three areas: • Razorpay gateway: hook up the new API keys, route payments through the existing purchase flow, and return clean success / failure callbacks to both the mobile and web layers. • Code clean-up: identify and squash the lingering bugs that block a production build. Most issues have already been isolated in the repo and just need solid fixes and regression checks. • Google Play closed testing: run the mandatory 14-day closed test track, concentrating on performance. You’ll configure the Play Console, gather metrics, and iterate on any findings so we end the cycle with a stable, compl...

    €181 Average bid
    €181 Offre moyenne
    82 offres

    Software Engineer- Social App Platform Location : Mumbai/Hybrid Type : Part Time Experience : 2+ Years We are looking for a Software Engineer with minimum of 2 years of experience to help us build and scale a social networking app, a platform designed for real time chat/local discovery. In this role, you will design low- latency, high-concurrency system that power our core social experience - from dynamic feeds and real time messaging to notification systems and user discovery. What We're Looking for :- Tech Stack : Proficiency in React Native, Flutter ,Swift (ios) and Android . Proficiency in Node.js,Go,Python or Java. Real Time experience: Demonstrates experience building or integrating real time messaging , websockets, notification systems and live media streaming Database &...

    €221 Average bid
    €221 Offre moyenne
    64 offres

    I need a single Android application that combines two core utilities: an efficient memory optimizer and an antivirus module. On the cleaning side, the app should intelligently free RAM, close unnecessary background processes, and provide clear before-and-after stats so users see how much memory was reclaimed. The process must be quick, unobtrusive, and light on battery. For safety, I want a built-in antivirus engine offering real-time scanning and automatic definition updates. As soon as a new file is downloaded, installed, or modified, it should be checked against the latest signatures and heuristics without noticeable lag. Updates to the virus database have to run silently in the background over Wi-Fi or mobile data, with fallback scheduling if the network is unavailable. I’d ...

    €202 Average bid
    €202 Offre moyenne
    31 offres

    I’m putting together a horror-themed experience for Minecraft Java Edition and need a dedicated plugin written from scratch. The goal is to add genuinely scary mechanics that go beyond what existing public plugins offer. Think of atmospheric effects, surprise events, or any original twist that can make players feel uneasy—but I’m open to your creative suggestions and will refine the final feature list together with you. Scope • Build for the latest stable release of Minecraft Java Edition and keep the code ready for minor version bumps. • Make sure the plugin runs independently with no external dependencies beyond Spigot/Paper APIs (unless we agree otherwise). • Clear configuration files so I can tweak timings, chances, or intensity of each horror element ...

    €19 Average bid
    €19 Offre moyenne
    22 offres

    Developer Brief Build a secure, cloud-based sports performance data platform that consolidates data from multiple technology providers into one dashboard. This is an example dashboard I have built The initial scope is to integrate Catapult Sports, VALD, and Teamworks. The platform must support both API-based data ingestion and manual or automated uploads of Excel/CSV files. API connections should retrieve approved data on a scheduled basis, while spreadsheet imports should validate, map, and standardise fields before storage. Create a central database with a consistent athlete profile and identifiers, enabling data to be matched across systems. Athlete matching should prioritise unique IDs and verified email addresses, with an administrator review process for unmatched or duplicate rec...

    €668 Average bid
    LDN
    €668 Offre moyenne
    121 offres

    i need to customize a Quiz earn Android app and upload work Add gk current affairs support math Hindi questions Change logo name color and design Add upi ads and refer earn Must give full source code keystore file Payment in 3 milestone only budget To Play Store sports 20000 25000

    €205 Average bid
    €205 Offre moyenne
    45 offres

    I need a lightweight Android application that lets two users share one device’s screen in real time with crisp 1080p video and clear, low-latency audio. While the session is live, participants should also be able to exchange text messages in a small chat pane that can be shown or hidden without interrupting the stream. Core requirements • Runs smoothly on current Android versions, handling typical 30 fps desktop-class rendering without stutter • Uses efficient codecs (e.g., H.264 / AAC via WebRTC or a comparable stack) to keep bandwidth below 3 Mbps whenever possible • One-tap “Start session / Join session” workflow—no complicated log-ins or room creation needed • In-session text chat with message history retained only for that session (...

    €27 Average bid
    €27 Offre moyenne
    17 offres
    PDFBox Rendering Layout Bug Fix
    5 jours left
    Vérifié

    My application relies on Apache PDFBox for generating and displaying PDFs, but the current build renders pages with an incorrect layout— it renders over other components in user interface. I need a developer who knows the internals of PDFBox, its Renderer (PDPageContentStream, PageDrawer, etc.), and the Java graphics pipeline to identify and patch the root cause of this layout problem. The problems is related to -method. It may be reproduced by adding a JSplitpane into a JFrame, then rendering to the left component. It renders over the right component, too. It is wrong. It also relates to PageDrawer and its setClip() -method. Even if we apply the initial clip, it still renders wrong, see code below. AffineTransform at = (); (); Shape shape = (initialClip); (shape); Moreover, if w...

    €432 Average bid
    €432 Offre moyenne
    104 offres

    We are looking for an experienced Software / System Architect to design and review the architecture of a closed-loop financial platform. The platform includes user accounts, balances, transactions, deposits/withdrawals, trading, payments, wallet functionality, and administration. We already have a development team and an existing system. We need an architect who can review the current setup, identify gaps, design the overall system architecture and flows, and provide clear technical guidance and architecture documentation for our developers. Experience with FinTech, payment systems, trading platforms, digital assets, banking, or other transaction-heavy financial systems is highly preferred. Please share relevant architecture experience and examples of similar systems you have worked on...

    €121 Average bid
    €121 Offre moyenne
    40 offres

    I have a RecyclerView driven by a LinearLayoutManager. Card taps are currently picked up through an OnPress handler, and I already keep the underlying data in a ViewModel. The problem is simple: when a user opens a detail screen from any card and then presses the back button, the list always jumps back to the very top instead of revealing the card they originally tapped. I need the list to remember its exact scroll position so that returning feels seamless. You’re free to solve it however you feel is cleanest—saving and restoring the layout manager state, using the Navigation component’s back-stack handling, or any other proven method—as long as: • the previous scroll position is restored every time, • orientation changes don’t break the fi...

    €9 Average bid
    €9 Offre moyenne
    26 offres

    I’m commissioning a full-featured American Roulette game that runs smoothly on both Android devices and modern browsers. The wheel must include 0 and 00 pockets and spin with a believable, casino-grade animation. Players should be able to place every standard bet—straight, split, street, corner, red/black, odd/even, dozens, and columns—and see results resolved instantly by a secure random number generator tied into a persistent balance system. Visual style: think classic casino—rich greens, polished brass, crisp typography—rather than minimalist or futuristic. I’m happy to provide reference tables, but I’m counting on you to capture that familiar Las Vegas feel. Core build expectations • Responsive UI built once and shared across Android (...

    €10 / hr Average bid
    €10 / hr Offre moyenne
    48 offres

    I need a skilled Android developer to transform my concept into a fully functional, Play-Store-ready application. The project targets the latest Android releases, so solid knowledge of native Android (Kotlin or Java) is essential. I’m open to modern frameworks such as Flutter if you can guarantee a smooth Android-only build. Scope • Translate my wireframes and user-flow notes into an intuitive UI that runs smoothly across common screen sizes. • Build the complete feature set we finalise together; possibilities may include push notifications, secure user sign-in, or even in-app purchases, so prior experience with Firebase, Google Play Billing, or similar services is valuable. • Integrate any necessary back-end APIs, set up local data caching, and ensure the app remains...

    €411 Average bid
    €411 Offre moyenne
    242 offres

    Position Summary: We are seeking a highly skilled and experienced Senior Integration Developer on Contractual basis (6-12 months) for an Australian company to contribute to the design, development, and deployment of enterprise integration solutions. Note: We are not looking for full stack developers. We need candidates with strong, hands-on Integration Developer experience in Apache Camel, Groovy/Java, Spring Boot, JUnit 5, and Azure Integration Patterns with strong focus on building scalable, secure, and maintainable integration services. Key Responsibilities: • Design and implement integration solutions using Apache Camel and Spring Boot. • Develop and maintain microservices and APIs using Groovy/Java. • Deploy and manage containerized applications using Azure Containe...

    €14 / hr Average bid
    €14 / hr Offre moyenne
    115 offres

    I need a skilled Python developer to develop a professional Python-based project. The project should have clean, well-structured, and maintainable code. I need help with development, debugging, testing, and deployment. Experience with Python, automation, data analysis, APIs, and AI/ML would be preferred. Please provide a clear project timeline, milestones, and estimated cost.

    €512 Average bid
    €512 Offre moyenne
    82 offres

    I’m looking for a skilled software developer to create a mobile application for Android devices. The main goal is to turn my concept into a reliable, user-friendly app that meets current Google Play standards. Key objectives: • Translate my idea into clear technical requirements and a development roadmap. • Build the Android application, using Kotlin or Java—or another modern stack you recommend—to ensure smooth performance on recent Android versions. • Implement a clean, intuitive user interface that follows Material Design guidelines. • Connect any necessary APIs or back-end services and handle data storage securely. • Test across multiple screen sizes, fix bugs, and prepare the final APK/AAB for submission to Google Play. Deliverabl...

    €434 Average bid
    €434 Offre moyenne
    226 offres

    Tenho um aplicativo em Python dividido em cinco componentes — Launcher em Tkinter, Executor, Overlay, banco de dados SQLite e automação Playwright. Quero que tudo funcione como um único produto coeso. Meu objetivo principal é Adicionar novas funcionalidades, mas antes disso preciso de uma revisão completa da arquitetura para garantir que os módulos atuais estejam bem estruturados, sem bugs ocultos e fáceis de manter. Escopo geral • Revisar a fundo Launcher (Tkinter), Executor e Overlay, identificando gargalos de desempenho, dependências circulares ou violações de boas práticas. • Corrigir qualquer bug encontrado, documentando o problema e a solução aplicada. • Refatorar para...

    €128 Average bid
    €128 Offre moyenne
    126 offres

    The role We're hiring a Senior Full-Stack Developer to help take our web games to the next level — building new gameplay, tightening performance, and growing the services behind accounts, scores, and matchmaking. You'll work across the whole stack: the React front end, the HTML5 canvas game engine, and the Node/Express + SQLite backend that powers it all. What you'll do - Design and build new game features and polished, responsive UI in React + TailwindCSS. - Write and optimize HTML5 Canvas game logic — physics, input, rendering, and a smooth 60 fps loop. - Build and maintain backend services: REST APIs, authentication, persistence, leaderboards. - Profile and fix performance bottlenecks across load time and interaction (large lists, render cost, network wat...

    €5892 Average bid
    €5892 Offre moyenne
    175 offres

    I need an experienced Android reverse-engineer to take an existing mobile app, remove its subscription checks, unlock every premium feature, and disable ads in a way that leaves the rest of the functionality untouched. This is a fully obfuscated APK that performs online licence verification, integrity tests, and signature validation, so you will have to bypass anti-tamper code, rebuild, align and re-sign the package so it installs cleanly on Android 8 through 14. I will provide the latest APK and, if helpful, a video walkthrough of the areas I want freed. You can use any combination of JADX, Apktool, Smali/Baksmali, Frida, or your own in-house tooling—as long as the final build is stable and the method is reproducible. Deliverables • Patched, installable APK with subscriptio...

    €220 Average bid
    €220 Offre moyenne
    31 offres
    Android Group Chat Messaging App
    4 jours left
    Vérifié

    I’m building a stripped-down social networking experience that centres entirely on text messaging. The goal is an Android-only app where users can exchange real-time text messages and spin up group chats without the heavier extras of photo sharing or profile feeds. Here’s what I need from you: • A clean Android Studio project (Java or Kotlin) that compiles out of the box. • Core screens for recent chats, one-to-one threads, and group conversations. • Real-time delivery of text messages, synced across devices even on spotty connections. • The ability for any user to create, name, and invite others to a group chat. • Push notifications for new messages. • Basic message history stored securely in the cloud (Firebase, Supabase, or a compara...

    €16 / hr Average bid
    €16 / hr Offre moyenne
    255 offres

    I’m building a modern, scalable web platform and need a developer who can take the lead on the React.js front end while still speaking the language of a Java/Spring Boot back end. Your main focus will be crafting a clean, responsive interface—complete with custom animations and intuitive interactions—then wiring it seamlessly to our APIs. Here’s how I picture the collaboration: • Front end: Design and code React components that work flawlessly on desktop and mobile, respect accessibility guidelines, and feel smooth thanks to well-placed animations and transitions. • Back end touchpoints: When the UI needs data, you’ll help create or refine the necessary Spring Boot REST endpoints, handle authentication/authorization flows, and jump into performanc...

    €8 / hr Average bid
    €8 / hr Offre moyenne
    92 offres

    I have a RecyclerView driven by a LinearLayoutManager. Card taps are currently picked up through an OnPress handler, and I already keep the underlying data in a ViewModel. The problem is simple: when a user opens a detail screen from any card and then presses the back button, the list always jumps back to the very top instead of revealing the card they originally tapped. I need the list to remember its exact scroll position so that returning feels seamless. You’re free to solve it however you feel is cleanest—saving and restoring the layout manager state, using the Navigation component’s back-stack handling, or any other proven method—as long as: • the previous scroll position is restored every time, • orientation changes don’t break the fi...

    €11 Average bid
    €11 Offre moyenne
    28 offres

    I already have the core screens in place for an Android agri-tech application that will serve three field-side user roles plus one admin panel. What I need now is an experienced Android developer who can take the project from this UI prototype through to a production-ready release on Google Play. Scope of work • Wire the existing layouts to a robust back end so that every user can input data, monitor it in real time and receive analytic dashboards that make sense in the field. • Build an alert and notification flow (push & in-app) to keep farmers instantly informed of anything that demands attention. • Integrate a payment gateway so transactions inside the app run securely and are audit-ready. • Prepare all artefacts required for Google Play publication, gu...

    €120 Average bid
    €120 Offre moyenne
    68 offres

    I’m building a new social-networking experience focused on fast, reliable messaging for Android. The scope is a native Android app where users can register, find friends, and chat one-to-one or in groups with text, emojis, and read receipts. Core deliverables • An Android Studio project written in Kotlin (Java is acceptable if you strongly prefer) • Clean, modular architecture (MVVM or similar) with clear documentation • Firebase, Supabase, or another real-time backend wired up for authentication and message sync • Basic material-design UI: login/signup, contact list, chat screen, settings • APK and source code ready for submission to Google Play, plus a brief hand-over guide While the first milestone covers messaging only, I’d like the codeb...

    €5 / hr Average bid
    €5 / hr Offre moyenne
    73 offres

    I want a self-contained software agent that, when I feed it the name or domain of a medium-sized enterprise, automatically pieces together the company’s full organisational chart and returns a verified corporate email and number for every person it finds. The agent may explore open data reservoirs—our internal databases, public directories and employee social profiles—but it should not rely on any authenticated endpoints, API keys or user log-ins. You are free to choose the language and stack, though Python plus libraries such as Scrapy, Beautiful Soup, Selenium or similar web-automation tools would make sense. The final output needs to be delivered in both machine-readable (JSON or CSV) and human-friendly form: a hierarchical tree or graph that clearly shows reporting ...

    €72 Average bid
    €72 Offre moyenne
    25 offres

    FlutterFlow Developer Required — Cross-Platform Mobile App Pilot I am looking for an experienced FlutterFlow developer to develop a cross-platform mobile app pilot. The application has a data-driven architecture, AI/API integration, reusable dynamic screens and database-driven content, and will require deployment to both Android and iOS. I have prepared a detailed development brief covering the application flow, architecture, functionality, AI integration, testing, source-code ownership and app-store deployment. I am looking for an India-based, preferably Chennai-based, individual developer or small development team with proven experience in: * FlutterFlow * Supabase and/or Firebase * AI/API integration * Dynamic and data-driven mobile applications * Reusable components and data...

    €145 Average bid
    €145 Offre moyenne
    27 offres

    I will send you the complete ChaloTrain source as a ZIP. Your first task is to open the project in Android Studio, iron out every build error and bug, and verify that the app name, icon, package ID and other Android-specific settings are correct. Once the code compiles cleanly I need both a release-signed APK and a Play-ready signed AAB. I have gone through Play Console once before, so I know the basics, but I’d like you to take the lead this time—create or update the listing, upload the bundle, handle content ratings, privacy policy links and any review feedback, and stay on the job until the status reads “Published”. Deliverables • Project configured and building without errors • Release-signed APK and AAB provided • App successfully uploa...

    €16 Average bid
    €16 Offre moyenne
    42 offres

    I need a production-ready Android application that lets gamers enter Free Fire and BGMI single-elimination tournaments using a dual-currency system. Players will spend coins to register, earn diamonds for every kill and final position, then redeem those diamonds for Amazon, Flipkart, or Google Play gift cards inside the app. Core experience • Clean, modern UI with separate weekly and monthly leaderboards that reset automatically. • Email-and-password login only; no social or phone auth is required. • Coins and diamonds must be handled by a secure, server-side wallet so no values are stored locally. • Offerwalls (Timewall, CPAlead, Monlix) should credit coins instantly once their callbacks fire. • I will supply my unity account—ads keep the app comp...

    €48 Average bid
    €48 Offre moyenne
    26 offres

    I need a seasoned Java developer to turn a set of Excel-based data assets into a fully-functioning web application, plus a light desktop utility that handles database management tasks behind the scenes. Here is the flow I have in mind: • Extract and clean the data currently stored in several spreadsheets (I’ll provide the .xlsx files). • Design an intuitive, professional interface for the web front end; Figma or a similar tool is fine as long as the final look is modern and responsive. • Build the core web application in Java. I’m comfortable with Spring Boot, Jakarta EE, or plain Servlets—use whichever stack lets you move fastest while keeping the code clean and well documented. • Create a companion desktop module (also in Java) focused solely...

    €8 / hr Average bid
    €8 / hr Offre moyenne
    32 offres

    Role & responsibilities -Required Technical Skills Experience: 4 + Years Large US Healthcare Enterprise Client : Optum Long Term Product Development Backend - Java & Spring Boot Frontend - Angular CI/CD: Docker, Github Workflow, Kubernetes Cloud : Azure Strong hands-on experience in Java and object-oriented programming. Extensive experience with Spring Boot and Spring Framework. Experience in designing and developing microservices-based applications. Strong knowledge of RESTful API development and integration. Hands-on experience with Apache Kafka, including producers, consumers, topics, partitions, and message processing. Front-End Strong hands-on experience with Angular and the latest Angular versions. Proficiency in JavaScript or TypeScript, HTML5, and CSS3. Experience in...

    €9 / hr Average bid
    €9 / hr Offre moyenne
    117 offres

    I need a fully-functioning social networking app built natively for Android. The core idea is to let users create profiles, connect with others, share posts, and interact in real time through likes or comments—nothing cross-platform is required; the entire experience will live on Android. Here is how I picture the collaboration: • You handle the complete Android Studio setup, coding, and basic UI/UX so the first build is installable on a modern Android phone. • I will supply the branding assets, colour palette, and any wireframes you might need once we begin. • We will review progress in small, testable milestones until the app is stable enough for a Play Store beta. Deliverables • Clean, well-commented source code and project files • A signed, lau...

    €256 Average bid
    €256 Offre moyenne
    60 offres

    I need a simple, reliable document-scanner that runs on both Android and iOS and ships to the Play Store and App Store without hiccups. The core task is straight-forward: open the camera, capture one or multiple pages, detect the edges automatically, crop, enhance, then save or share the result as a single PDF. Key functions I must see working smoothly: • Auto-cropping and page-boundary detection so users don’t have to fiddle with manual corners. • Local file management: folders, rename, quick search and the option to delete or re-order pages before final export. • One-tap “Save as PDF”. No OCR or deep editing—just clean scans. • Although “cloud storage integration” was ticked, I actually want files to stay on the device for ...

    €72 Average bid
    €72 Offre moyenne
    57 offres

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