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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, transactions, and content reports. • Clean, modern UI that matches current Material Design guidelines. Technical expectations • Android Studio project written in Kotlin (Java is acceptable if you have strong reasons). • Scalable real-time backend (Firebase, Agora, WebRTC, or a proven alternative) with REST/GraphQL endpoints for non-RTC data. • Push via FCM or OneSignal. • Secure storage of media and profile assets on AWS S3, Firebase Storage, or a comparable solution. • Source code must be well-documented and delivered in a private Git repository at project hand-off. Deliverables 1. Signed APK for testing. 2. Production-ready APK. 3. Complete source code (mobile, backend, admin panel) with build instructions. 4. Brief deployment guide covering server setup, domain, SSL, and notification keys. 5. One-week bug-fix window after final delivery. Acceptance criteria • Phone verification works end-to-end using OTP. • Voice quality remains clear with <300 ms latency under normal 4G conditions. • No crash or memory leak after 1-hour stress test on mid-range devices. •
Project ID: 40644684
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109 freelancers are bidding on average $526 USD for this job

With an impressive portfolio that showcases my ability to develop concise and impactful visual identities, I believe I am the ideal candidate to design your project's logo.I've developed diverse logos for various industries and understand the importance of a brand identity aligning with the client goals. Regarding your app development needs, Although logo design is my core forte, I have a strong technical background that compliments this project. I am well-versed in Android Studio and proficient in both Kotlin and Java languages. Drawing from my experience with scalable backends like Firebase, WebRTC, and even REST/GraphQL for non-RTC data retrieval, I guarantee a smooth, top-tier voice chat application. To ensure exceptional work quality, I am committed to delivering robust code with detailed documentation, all hosted in a private Git repository. By adhering to Material Design guidelines, I'll present a clean and modern UI that blends intuitively with the system's platform. Finally, through rigorous testing on various devices before the final delivery, like stress tests on budget-friendly devices to ensure no memory leak or crashes occur under extreme conditions reassure you of a high-performance application.
$750 USD in 2 days
8.9
8.9

Hi there, I understand you're building a real-time social audio app. Operationally, a user signs up via phone OTP, manages a profile, and can then join public voice chat rooms or start private 1-on-1 calls with text chat. The system includes an in-app wallet for balances and withdrawals, with a central web admin panel for managing users, rooms, and transactions. Technical approach: Native Kotlin (MVVM) for the Android app. A Node.js or Spring Boot backend will handle the REST API (profiles, wallet) with PostgreSQL. For the real-time voice, we'd integrate the Agora SDK to ensure low latency and scalability. The admin panel would be built with React. Core modules: - Auth & Profiles: OTP flow using Twilio or Firebase Auth, with secure JWT sessions. - Real-time Voice: Agora-powered rooms for group chat and private calls. - Wallet System: Secure endpoints for top-ups (e.g., Stripe integration) and a logged withdrawal request flow. - Admin Panel: A dashboard to moderate content, manage users, and view financial transactions. Relevant systems: We developed "Android Call Management Software" integrating directly with a FreeSWITCH server and built "SecureCom," a mobile app for E2E encrypted voice and text communication, demonstrating our experience in this domain. Our strategy is to build the core auth and public voice room MVP first, then expand to private calls and wallet features. This ensures the core loop works perfectly before adding complexity. Regards, Rohit
$250 USD in 75 days
8.1
8.1

With extensive experience in Android app development and real-time communication technologies, I understand the need to create a robust voice chat application for Android. My past projects involved integrating secure login methods, real-time messaging, and push notifications. Question: Have you considered any specific SDK or API preferences for the real-time backend to ensure optimal performance and scalability for the voice chat feature? Regards, Rakibul Hoque
$350 USD in 3 days
7.8
7.8

As an experienced designer with over 10 years in the field, I am more than prepared for the challenge that your project presents. My proficiency in Adobe Illustrator, Adobe Photoshop, Corel Draw, among others have made me adept in producing exceptional designs across various mediums. And I’m proud to say I have pleased around 1450+ clients till now. To achieve satisfactory results for you, I not only promise but also pursue open and regular communication. With this application, I would be focusing on maintaining an up-to-date interface consistently while making it adhere to current Material Design guidelines. This balance between style and substance is something I believe really sets a design apart.
$251 USD in 1 day
7.4
7.4

Hi, I understand you’re looking for a complete Android voice-chat platform with OTP authentication, public/private voice calls, messaging, wallet, push notifications, admin panel, and a scalable real-time backend. This is a substantial full-stack application requiring Kotlin/Android development, RTC infrastructure such as Agora/WebRTC, backend APIs, secure wallet/transaction handling, Firebase/FCM, storage, and an admin dashboard. I’ve been actively bidding on Freelancer.com for the past 3 years. Unfortunately, I haven’t yet had the opportunity to work on a project through the platform. I’m now looking for my first opportunity to prove my skills, and I’m ready to give the project my full commitment. However, my primary professional experience is in logo, branding, and visual design, rather than complex Android and real-time backend development. I therefore don’t want to misrepresent my technical expertise. If you’re also looking for UI/UX or visual branding support for the application, I’d be happy to contribute. Portfolio: https://www.freelancer.com/u/arabinduray2021 Thank you!
$5,500 USD in 2 days
7.3
7.3

Understanding the goal of creating a full-featured voice chat application, our team is ready to deliver a secure and engaging platform. We focus on ensuring high-quality voice communication and user-friendly interfaces that foster community interaction. We'll implement phone-number verification for secure logins and develop user profiles with expandable features. Our approach will prioritize latency optimization for smooth voice calls and real-time messaging. Our expertise in Kotlin, combined with scalable backends like Firebase or WebRTC, will ensure seamless performance. Also mention that communication, quality, and on-time delivery are priorities. If you'd like, I can also share similar work we've completed and discuss the best approach for your project. Regards, JP
$400 USD in 7 days
6.8
6.8

Hello, Hope you are well. I have read your project description carefully. For this logo project of yours, I am confident to create a quality unique logo with my best creative skills. I will help you create the logo you want to create. I will show you the creative logo and get the job done with 100% satisfaction. Finally I will provide you all files ai,eps,jpeg,png,pdf,svg. So let's work together to realize your dream now and take your brand to unique heights. I have 5 years of experience in logo design, Illustration, Photoshop, Graphic Design and Illustrator. You can view my previous work freelancer.com protfolio link. https://www.freelancer.com/u/CD0097 Click the chat button & Lets start the work! Best Regards, Rohul
$255 USD in 2 days
7.0
7.0

Hi, I understand you need a complete Android voice-chat platform, not just the mobile UI — including OTP authentication, public voice rooms, private calls, messaging, wallet, notifications and a web-based admin panel. I’m Jitendra, a full-stack developer with 10+ years of experience, and I have already built similar real-time communication applications with voice/video calling, chat, OTP authentication, wallets and admin dashboards. I’d recommend Kotlin for Android, Agora/WebRTC for low-latency voice, Node.js/NestJS + PostgreSQL for the backend, FCM for notifications and AWS S3 for media. The architecture will keep RTC and financial/user data separated for better scalability and security. I’ll deliver the Android app, backend, admin panel, signed APKs, complete source code, deployment documentation and the requested post-launch bug-fix period. I can start immediately and work through clear milestones from OTP → voice/chat → wallet → admin → testing and production. Thanks, Jitendra
$1,000 USD in 7 days
6.3
6.3

Hi I will be able to help you. Please message me so that we will have detail technical discussion. I have 9+ years of combined experience in Mobile Application development, Website development, Desktop application development, 3rd party Artificial Intelligence api, AR/ VR, Chatbot, Blockchain- Cryptocurrency, CRM & ERP, Game Development and any other Software development. I am having expertise in Native on Android Java, kotlin and IOS Swift, and For Hybrid Cross platform on Flutter Dart & React- Native, and for web and backend on react js and node js, Python Django. Please consider me and initiate a chat for further detailed discussion. Regards, Anju
$400 USD in 7 days
6.6
6.6

Hello Client ! Just checked your project description about the development of a Mobile application. Developed Android and iOS applications for worthy clients like you on this platform our team is leading and on the top. Consider us for your project and i promise we won’t let you down. iOS Design and Development , Android Design and Development etc Please check my profile once for reference and expertise. It will be done perfectly Because , I am perfect on it ╰┈➤Android Studio, Native, Flutter , Dart , Firebase etc. Thank you
$251 USD in 2 days
6.0
6.0

With the emerging voice technology and its increasing presence in consumers' lives, designing a logo for your voice chat application requires meticulous understanding. As a seasoned graphic designer, specializing in branding, I am well-versed with the art of creating visuals that encapsulate a brand's essence. Therefore, teaming up with me for your project can guarantee the delivery of a logo that deftly conveys your app's purpose, innovation and sets it apart from the competition. Apart from my proficiency in crafting visually captivating designs, my digital graphics skillset will complement your project's requirements for a "clean, modern UI." My designs extend beyond aesthetics; I focus on user-centricity and ensure a seamless user experience through my UI/UX analytical approach. This makes me an ideal fit for creating not only an impactful logo but also consistent branding elements throughout your app interface. In conclusion, working with me means receiving not just any design, but one with creativity that aligns coherently with your vision. You will experience clear communication, meticulous attention to detail, fast turnaround times, and most importantly, uncompromising quality. Let's join hands to create an extraordinary and memorable brand identity for your voice chat application!
$270 USD in 2 days
5.6
5.6

Hello, We have reviewed your requirements for the Android Voice Chat Application and understand that you need a complete platform with OTP login, public voice rooms, private calls, messaging, wallet, notifications and an admin panel. Relevant Work: Neuromind Android App: Personality Test Android App: MeetMe – Social/Chat Platform: LoveMe – Dating/Communication Platform: PayPenny – Wallet/Payment Platform: MoneyFirst – Finance/Payment Platform: AIVantage Connect – AI/Communication Platform: CityBee – Location/Service Platform: How We Can Do It: We recommend Kotlin + Firebase/Node.js + Agora or WebRTC + FCM + AWS S3, with a secure backend and web-based admin panel. We will develop the complete user flow including OTP authentication, voice rooms, private calls, chat, wallet, notifications and admin management. We have experience building real-time, communication, finance and mobile applications, and can provide clean, scalable code with complete deployment documentation and post-launch support. Looking forward to working with you. Thank you, Deepika Sharma
$500 USD in 14 days
5.6
5.6

Hello Sir, I’ve carefully checked your requirements and really interested in this job. I’m working as a freelance graphic designer with U.S. and European teams. I have rich experienced in Photoshop, Illustrator, Visual Design, Social Media Marketing, Logo Design, Figma, Branding and Graphic Design. I’m ready to discuss your project and start immediately. Looking forward to hearing you back and discussing all details.. Thanks and Regards
$300 USD in 2 days
5.9
5.9

Hello, this is a fairly large Android real-time communications build, and the part that determines whether it succeeds is not the UI layer but the interaction between voice transport, session state, notifications, and wallet/admin operations under production conditions. The real engineering risk is keeping voice latency and session reliability stable while the app also handles OTP auth, room presence, private calls, push delivery, and transaction state without drift or edge-case failures. I usually structure systems like this by separating RTC, app state, and operational back office concerns rather than letting them collapse into one service boundary. The closest match in my background is AI Translator Plugin for the low-latency streaming side, and DocIntel AI — Document Intelligence & Event Extraction Platform for backend/admin architecture and production service separation. Given your Kotlin requirement, I would treat the Android client, signaling/session layer, messaging/wallet APIs, and admin panel as distinct surfaces with clear contracts. For the RTC path, the tradeoff is usually between faster integration and tighter control over latency, moderation, and call-state behavior. I approach systems like this for long-term production use, with explicit handling for reconnects, notification idempotency, auditability around wallet changes, and stress behavior on mid-range devices. If useful, I can sketch the service boundaries and call/session state model first. Clifton
$500 USD in 7 days
5.6
5.6

Hello, I can create/modify the app/web as you wish. I have 6.5+ years of experience in this field. Let's connect and discuss more about your requirements. Thank you.
$250 USD in 10 days
5.1
5.1

Hello, I have already completed similar Android applications involving voice communication, real time messaging, user accounts, notifications, wallets, APIs, and admin dashboards. I have strong experience in web development, APIs, and scalable software solutions, so I can quickly understand your requirements and deliver exactly what is needed. I can develop the Kotlin Android app with OTP login, public voice rooms, private calls, text messaging, push notifications, wallet management, secure media storage, and a web admin panel. I will also focus on low latency voice communication, session security, and stable performance during extended testing. Will the wallet top ups and withdrawals use an existing payment provider or a custom API that you already have? I would be happy to discuss the architecture, voice solution, and backend flow in a quick meeting and get started. I will share my portfolio in chat I look forward to hear from you. Thanks Best Regards, Mughira
$500 USD in 7 days
5.2
5.2

As a seasoned Full Stack Developer with over 8 years in the industry, and your project's focus on delivering a high-quality voice chat application that runs smoothly on Android - I believe my expertise is a perfect fit. With deep knowledge in both Java and Mobile App Development, I have the skills necessary to ensure a professional product that meets all your specifications. I also pride myself on being able to create scalable solutions, which will be valuable for your project's core features, such as phone-number verification as the only login method, secure session handling, and clean UI matching Material Design guidelines. Lastly, with any software development, post-release support is crucial. You can trust me to stay committed even after project hand-off; I provide a one-week bug-fix window ensuring all parts work seamlessly together. That being said, I'm ready and excited to contribute towards your voice chat application's success! Let's discuss your project specifics further so we can realize something truly amazing together!
$300 USD in 7 days
4.9
4.9

Hi there, Your Android voice chat app needs reliable OTP login, low-latency voice, and a clean admin workflow from day one. I have strong expertise in Android App Development and Kotlin, and I can build this with secure phone verification, a scalable Agora-based voice layer, real-time text, FCM notifications, wallet flows, and a Material Design UI. I will structure the app, backend, and admin panel so profiles, reports, transactions, and media storage are all cleanly connected and documented for hand-off. Best regards, Ian
$555 USD in 3 days
4.2
4.2

I see you're looking for a robust voice chat application, and my experience building real-time communication platforms, including secure session handling and low-latency audio streaming similar to what's described, aligns perfectly with your project goals. I understand the critical need for a smooth Android experience and the value of complete source code. My technical approach will leverage Kotlin for native Android development, ensuring optimal performance. For real-time voice, I'll implement WebRTC, configured for low-latency and high-quality audio. Secure session handling will utilize JWTs, with Firebase Authentication for phone number verification. User profiles will be managed via a NoSQL database like Firestore, allowing for easy schema expansion. Push notifications will be handled by Firebase Cloud Messaging. To ensure we're on the same page regarding the user experience, what are your primary considerations for audio codec selection to balance quality and bandwidth? Also, have you identified any specific third-party services you'd prefer for wallet functionality, or would you like recommendations? I'm available for a brief call to discuss these details further.
$611 USD in 21 days
4.2
4.2

Hi, Your project is more than a standard Android app—the key challenges are low-latency voice communication, secure OTP authentication, real-time messaging, wallet transactions, push notifications, and a scalable admin/backend system. I’m a senior mobile app developer with 8+ years of experience building production-ready mobile applications, including social networking, real-time communication, booking, e-commerce, and location-based platforms. For your project, I can deliver: • Native Android app using Kotlin/Android Studio • Phone-number OTP authentication with secure sessions • Public voice rooms and 1-to-1 voice calls using a proven RTC solution such as Agora/WebRTC • Real-time private messaging • FCM push notifications • User profiles with photo, name, bio & interests • Secure wallet, top-ups, withdrawals and transaction history • RESTful backend APIs with scalable database architecture • Web-based admin panel for users, rooms, transactions and reports • Secure media storage using AWS S3/Firebase Storage • Clean Material Design UI • Complete source code, signed/production APKs and deployment documentation I understand the importance of your <300ms voice-latency target and 1-hour stability/stress testing. I’ll focus on performance, security and maintainable architecture throughout development. I’m available to work full-time and would be happy to build this as a long-term product partnership. Best regards, Vinod
$500 USD in 7 days
3.6
3.6

Kathmandu, Nepal
Member since Aug 31, 2025
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