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Ich betreibe [login to view URL] – zurzeit nur als inserat eine Auktions- und Marktplatzplattform für Fahrzeuge – und möchte das Angebot um mehrere konkrete Funktionen erweitern. Die Website ist zurzeit mit einem app verbunden für android und ios Ich brauche auch im adminpanel erweiterte Funktionen für seo Umfang 1. Neue Auktionsoptionen • Sofortkauf: Bietende sollen ein Fahrzeug direkt erwerben können, ohne das Ende der Auktion abzuwarten. • Reservepreis: Verkäufer geben einen Mindestverkaufspreis an; liegt das Höchstgebot darunter, wird das Fahrzeug nicht verkauft. • Auktionsverlängerung: Wird kurz vor Auktionsende geboten, verlängert sich die Laufzeit automatisch um ein definiertes Zeitfenster. 2. Zusätzliche benutzerfreundliche Features • Suchfunktion mit Filtern (Marke, Modell, Baujahr, Preis u. a.). • Nutzerkommentare auf Fahrzeuginseraten. • Personalisierte Empfehlungen auf Basis bisheriger Suchen, Beobachtungen und Gebote. Rahmenbedingungen • Bitte prüft vorab die bestehende Website, um Kompatibilität und technischen Stack einzuschätzen. • Ich erwarte sauberen, dokumentierten Code sowie eine kurze Einweisung, wie ich die neuen Module aktiviere bzw. verwalte. • Tests (Unit / Integration) für Kernabläufe der neuen Auktionsoptionen sind gewünscht, damit künftig Updates problemlos eingespielt werden können. Lieferables – Vollständiger Quellcode der neuen Funktionen – Datenbank-/Schema-Anpassungen (falls nötig) – Installations- oder Migrationsanleitung – Kurze Funktionsdokumentation für Admin- und Endnutzeroberfläche Macht mir bitte ein verbindliches Angebot inklusive Zeitplan; der hier angezeigte Preis dient nur als Platzhalter. Ich freue mich auf eure Vorschläge und Rückfragen.
Project ID: 40717275
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127 freelancers are bidding on average $170 USD for this job

Hi Valuable Client, CnEL India can help extend Autokorb with the requested auction and marketplace features while preserving the existing website and mobile app functionality. Our methodology would be: • First audit the existing website, app integration, backend, database, and current auction workflow. • Design and implement Buy Now, Reserve Price, and automatic auction-extension logic with proper validation. • Enhance vehicle search with structured filters for brand, model, year, price, and other relevant fields. • Add comments and personalized vehicle recommendations based on user activity. • Extend the admin panel with appropriate SEO controls and management options. • Update database/API structures where required while maintaining compatibility with the existing app. • Add unit and integration testing for critical bidding, auction, and purchase workflows. • Perform regression, security, and performance testing before deployment. • Provide clean source code, migration instructions, documentation, and admin/user guidance. We can first review the current technical stack and codebase, then provide a realistic timeline and fixed quotation based on the actual scope. Regards, Chanchal CnEL India
$140 USD in 15 days
9.0
9.0

Good day!!-----Ich kann Ihre bestehende Fahrzeug-Auktionsplattform gezielt um Sofortkauf, Reservepreis und automatische Auktionserweiterung erweitern und dabei Website, Android/iOS-App sowie Adminpanel berücksichtigen. Auction Logic • Marketplace • API Integration • Search & Filters • Recommendations • SEO Admin • Database • Unit/Integration Testing Ich prüfe zuerst den bestehenden Stack und die aktuelle API-Struktur, damit die neuen Funktionen sauber integriert werden und die bestehenden Abläufe stabil bleiben. Gerne erstelle ich nach der Prüfung einen verbindlichen Zeit- und Kostenplan. Thanks!! Parminder
$228 USD in 2 days
8.2
8.2

Good Day! I have carefully analyzed your project and can extend AutoKorb with Sofortkauf, Reservepreis, Auktionsverlängerung, advanced search filters, comments, personalized recommendations, and enhanced SEO controls while maintaining compatibility with your existing Android/iOS app and admin panel. I’ll first review the current stack, then provide clean documented code, schema updates, core unit/integration tests, documentation, and a clear implementation timeline. I am eager to contribute my expertise and deliver top-notch results for your project. Let's discuss the project further in chat or let's have a quick call! Best regards, M Adeel.
$100 USD in 3 days
8.1
8.1

Hi there! I am a senior Full Stack Developer with 13+ years of experience in PHP and JavaScript, with strong experience in Laravel, MySQL, REST APIs, React.js and Flutter. I can review your existing AutoKorb platform and integrate the required auction and marketplace features without affecting the existing Android and iOS applications. I can implement: * Buy Now / Instant Purchase * Reserve Price * Automatic auction extension for last-minute bids * Advanced vehicle search and filters * Comments on vehicle listings * Personalized vehicle recommendations * Advanced SEO management in the admin panel * API updates for the existing Android and iOS apps * Required database/schema changes * Unit and integration tests for core auction workflows * Clean, documented and maintainable code * Installation, migration and feature documentation * Admin and user guidance I will first review the existing codebase, database, APIs and mobile app integration to ensure the new modules are compatible with your current system. I am available 40 hours weekly and can start immediately. Please message me for more discussion about your project. Thanks, Sachin.
$140 USD in 7 days
7.5
7.5

Ihre Plattform braucht an mehreren Stellen neue Kernlogik zugleich: Auktionsregeln, bessere Suche, Interaktion auf Inseraten und Empfehlungen auf Basis von Nutzerverhalten. Das Entscheidende ist dabei nicht nur die Entwicklung selbst, sondern dass die neuen Abläufe mit dem bestehenden System und der verbundenen Android-/iOS-App stabil harmonieren. Ich würde das in klaren Modulen aufbauen, inklusive Migrationen, Tests und verständlicher Admin-Dokumentation. Ich habe Erfahrung mit Erweiterungen an bestehenden Verkaufs- und Listing-Plattformen, bei denen man vorsichtig am Datenmodell und an zeitkritischen Prozessen arbeiten muss. Besonders bei Reservepreis und automatischer Verlängerung lohnt sich saubere Backend-Logik mit Tests, damit Gebote und Abschlussregeln später nachvollziehbar bleiben. Ich kann außerdem eine kurze Anleitung beilegen, wie die neuen Bereiche aktiviert und verwaltet werden. - Ist die aktuelle Website ein eigenes System oder basiert sie auf einem Framework/CMS? - Wie detailliert sollen die Fahrzeugsuche und Filter im ersten Schritt werden? - Haben Sie schon eine Vorstellung, nach welchen Signalen die Empfehlungen priorisiert werden sollen: Suche, Merkliste, Gebote oder Aufrufe?
$175 USD in 7 days
7.2
7.2

Hi, I went through your project details and understand what you're looking to achieve. I'd be interested in working with you on this. Based on the requirements you've shared, I can handle the project from start to completion while keeping the work aligned with your expectations, timeline, and desired outcome. My approach is straightforward: first, I'll make sure the requirements and expected deliverables are clear. Then I'll complete the work in structured stages, share progress along the way, incorporate your feedback, and deliver the final work after everything has been reviewed. Before we begin, I have a couple of questions about your requirements that will help me understand the scope more accurately. Feel free to message me so we can discuss the details and determine the best way to move forward. Best regards, Anum
$250 USD in 1 day
6.8
6.8

Your auction platform needs a bidding queue system that prevents race conditions when multiple users bid in the final seconds. Without proper transaction isolation, you'll get duplicate "winning" bids that create legal disputes. Quick questions - what's your current database engine (MySQL/PostgreSQL), and are you handling real-time bid updates via WebSockets or polling? Here is the architectural approach: - PHP BACKEND: Implement atomic bid validation with row-level locking to prevent overbidding conflicts during auto-extension windows. - API DEVELOPMENT: Build RESTful endpoints for Sofortkauf transactions with idempotency keys to avoid double-charging users on network retries. - DATABASE DESIGN: Add indexed reserve_price and bid_history tables with triggers that auto-close auctions when thresholds aren't met. I've built similar auction systems for 2 automotive marketplaces handling 500+ concurrent bids without data corruption. Let's schedule a 20-minute call to review your current codebase before I provide a fixed-price quote with milestones.
$130 USD in 3 days
7.2
7.2

Hello There! I’m Md Toriqul Islam, an experienced full-stack marketplace and auction platform developer with 10+ years of experience, and I’m excited to partner with you. I understand you need to extend Autokorb with Buy Now, reserve prices, automatic auction extensions, advanced vehicle filters, comments, personalized recommendations, and expanded SEO controls in the admin panel, while maintaining Android and iOS compatibility. I am skilled in Laravel, PHP, Node.js, React, REST APIs, PostgreSQL, MySQL, auction logic, mobile API integration, search systems, recommendation features, testing, and admin dashboards. I can review the existing stack, implement the auction workflows safely, update APIs and database schemas, add SEO management tools, write core unit/integration tests, and provide documented migrations and handover instructions. 1. Which backend technology, database, and mobile API architecture currently power Autokorb? 2. Are the Android and iOS apps maintained from the same API, and must all new auction features be available in both apps? Looking forward to hearing from you. Best regards, Md Toriqul Islam
$100 USD in 3 days
6.7
6.7

As a Full-Stack Developer with expertise in JavaScript and PHP, I'm confident about delivering the desired innovative auction features for Autokorb.com. Autokorb's interface's compatibility with the app (Android and iOS) is a great advantage facilitating ease of use between different platforms. My skills also include Node.js, React, Vue.js emphasizing my command over modern technology stack suitable to meet your requirements. Drawing from my past projects, I'm experienced in creating well-documented, efficient code, something specifically requested in your project. I strongly adhere to clean coding conventions while complying with the need for detailed instructions you've laid out. My strong points span from UI/UX design to backend, APIs, databases and beyond. This knowledge base will help me create personalized user recommendations while incorporating user comments on vehicle listings among other diverse additions mentioned in the project.
$140 USD in 1 day
6.6
6.6

Ich habe Erfahrung mit Auktionsplattformen, Marktplätzen, Suchfiltern, Benutzerfunktionen und komplexen Admin-Panels. Ich kann Ihre bestehende AutoKorb-Plattform prüfen und die neuen Funktionen sauber in die vorhandene Website und App-Struktur integrieren. Ich kann Sofortkauf, Reservepreis, automatische Auktionsverlängerung, erweiterte Fahrzeugsuche, Kommentare und personalisierte Empfehlungen umsetzen. Auch das Admin-Panel kann um umfangreiche SEO-Einstellungen und Verwaltungsfunktionen erweitert werden. Ich liefere sauberen dokumentierten Code, notwendige Datenbankanpassungen, Unit- und Integrationstests sowie Installations- und Bedienungsdokumentation. Nach Prüfung des bestehenden Systems kann ich Ihnen ein verbindliches Festpreisangebot mit einem realistischen Zeitplan erstellen.
$70 USD in 2 days
6.0
6.0

I've built auction platforms and integrated payment systems before, so this is right in my wheelhouse. I'll review the existing codebase, add the auction features (buy now, reserve price, auto-extension) with database updates, then implement the search, comments, and recommendations. I'll write unit tests for critical paths and document everything for admin use. I can start immediately. Thanks, Andrii.
$150 USD in 2 days
5.7
5.7

Hello, I can build the auction features for your platform by integrating a modular system that separates the auction logic from the existing marketplace code, avoiding tight coupling. I’ve added a similar auction extension for a car marketplace before—it reduced support tickets by 30% by using a reserve-price validation system that prevents accidental sales below the minimum. I’d approach this by creating a new auction module with hooks for the existing app, then adding the buy-now and reserve-price logic as middleware. The auto-extension will use a cron job to check bids in real time. This will let you add new auction types without rewriting the core marketplace. The biggest improvement will come from the personalized recommendations, which will increase repeat visits by 20%. I’ll provide a database schema update and test scripts to ensure compatibility with your existing setup. After delivery, I’ll walk you through the admin panel changes and leave documentation for future updates. If this approach works for you, I’d be happy to discuss the timeline and pricing in more detail. Thanks, Lazar.
$50 USD in 1 day
5.3
5.3

⚠️ Wenn Sie nicht zufrieden sind, zahlen Sie nicht. ⚠️ Hi, vielen Dank, dass Sie meine Vorschläge in Betracht ziehen und mir Ihre Anforderungen übermittelt haben. Ich kann Ihre Auktions- und Marktplatzplattform für Fahrzeuge mit erweiterten Funktionen unter Verwendung von PHP und MySQL aufbauen, mit einem benutzerfreundlichen und performanten Design. Ich werde liefern: • Sofortkauf-Option für sofortige Käufe • Implementierung eines Reservepreises für Verkäufer • Auktionsverlängerung bei Geboten kurz vor Ende • Ausgereifte Suchfilter für optimale Nutzererfahrung • Kommentare und Nutzerinteraktionen auf Inseraten • Personalisierte Empfehlungen basierend auf Nutzerverhalten • Vollständige Unit- und Integrationstests für Robustheit Zusätzlich erhalten Sie: • Kurze Einweisung zur Verwaltung der neuen Module • Detaillierte Dokumentation für Admin- und Endnutzer Ich bin zuversichtlich, Ihre Vision effizient umzusetzen. Freue mich auf die Diskussion über den Zeitplan und die nächsten Schritte. Best regards, Chirag.
$150 USD in 7 days
4.8
4.8

Hi, ich habe Erfahrung mit Auktions und Marketplace Plattformen, mobilen Apps sowie Admin Panels und kann bestehende Systeme erweitern, ohne die aktuelle Android und iOS Anbindung zu beeinträchtigen. Ich werde zuerst den bestehenden Stack und die API Struktur prüfen und danach Sofortkauf, Reservepreis, Auktionsverlängerung, Filter, Kommentare und personalisierte Empfehlungen sauber integrieren. Zusätzlich erweitere ich das Adminpanel um SEO Funktionen und liefere Tests, Datenbankanpassungen, dokumentierten Quellcode sowie eine kurze Anleitung. Zeitplan: 10 bis 14 Werktage nach Prüfung des bestehenden Codes. Das verbindliche Angebot erstelle ich nach dem technischen Check.
$70 USD in 2 days
5.2
5.2

Hello Sir, I have already worked on similar types of website and software development projects and I am confident that I can successfully handle your project. I am a full-time freelancer with **17+ years of experience** in web development, software development, automation, and API integrations. My expertise includes: * ASP.NET C# web and software development * Android app development * Python automation and web scraping (Amazon, Instagram, Facebook, Google Maps, LinkedIn, Telegram, and other custom scraping solutions) * JavaScript, jQuery, AJAX, Bootstrap, HTML5 * Microsoft SQL Server database development * Payment gateway integration * SMS, Email, Banking, Financial, and Insurance API integration * Custom automation bots and workflow automation software I focus on delivering **high-quality, scalable, and reliable solutions** with clean code and long-term support. Please contact me in private chat so we can discuss your requirements in detail. I can also show you a **demo of similar projects** I have completed. Looking forward to working with you. Thanks & Regards
$250 USD in 2 days
5.2
5.2

Hello, Thank you for considering my proposal for enhancing the functionality of autokorb.com. I understand that you’re looking to expand your vehicle auction platform with new features and improved SEO capabilities, while ensuring compatibility with your existing app for Android and iOS. I have extensive experience in developing and enhancing e-commerce and auction platforms, utilizing technologies such as PHP, JavaScript, and MySQL. My approach focuses on delivering high-quality, maintainable code that aligns with your project goals. To successfully complete the project, I propose the following steps: - Analyze the current website's architecture to ensure seamless integration of new auction options, including immediate purchase and reserve price features. - Implement user-friendly enhancements like advanced search filters and user comments to improve the overall experience. - Provide thorough documentation and training on how to manage the new modules, along with unit and integration testing to ensure reliability. I’m eager to start this project and am confident in delivering quality results within your timeline. I look forward to discussing your requirements in more detail and providing a formal proposal. Best regards.
$30 USD in 7 days
4.9
4.9

I build custom software solutions for startups, growing businesses, and modern companies that need reliable, scalable, and results-driven technology. With 7+ years of experience, I help clients create and improve digital products across AI, SaaS, web, mobile, eCommerce, automation, and backend systems. I support projects from planning and architecture to development, testing, deployment, and ongoing improvement. I help clients launch faster, automate workflows, and build dependable products that scale. I believe strong products come from clear communication, practical engineering, and consistent execution. My goal is to deliver solutions that are not only functional but dependable, maintainable, and ready for real business growth.
$140 USD in 2 days
4.6
4.6

Hello, I can help extend your existing vehicle auction and marketplace platform with the requested auction features, advanced search, comments, recommendations, and admin SEO functionality. I have experience with WordPress, custom functionality, APIs, databases, and responsive web development. I’ll first review the existing stack and Android/iOS integration to ensure compatibility before making changes. I can provide clean, documented code, database updates, testing for core auction flows, and clear admin/user documentation. I’m available to review the existing platform and provide a **fixed price and realistic timeline** after checking the current setup. Looking forward to discussing the project. Best regards, MD. AL AMIN
$99 USD in 3 days
3.7
3.7

Hi, adding a reserve price and instant buy option to an existing auction system often breaks the bidding logic if the database schema is not updated to handle multiple active states for a single item. I would start by auditing the current database structure to ensure the status field can support "active", "sold", and "reserved" simultaneously without data loss. I will build the instant buy feature to trigger a direct database update that locks the item and notifies the seller immediately, bypassing the standard auction timer. A common mistake developers make is treating the auction timer as a separate process that just checks the time, which causes race conditions where two people bid at the exact same second. I would implement the auction extension logic directly within the bidding event handler so the timer resets instantly and atomically. You can expect a clean codebase with unit tests for the bidding logic and a simple guide to enable the new modules in the admin panel.
$140 USD in 3 days
3.6
3.6

Hi, I'd build the auction extension time as its own scheduled job that fires when a bid lands inside the last few minutes, rather than checking it on every page load. That keeps the site fast even with a lot of bidding activity happening at once on a listing. Buy-now and reserve price both just need a couple new fields on the vehicle listing and some logic in the bid handler to check them before accepting a bid. Search filters and recommendations are more work since they touch how listings get indexed, but they're straightforward once I've looked at your current database structure. Comments are the easy part. I'll also add the SEO fields you want in the admin panel so you can edit titles and descriptions per listing without touching code. One thing to flag: since you've got a mobile app tied to the same backend, any database changes need to stay compatible with what the app expects, so I'll test both sides before anything goes live. Given the scope here, I'd plan on 2 days including testing and a short walkthrough of the new admin controls. Can start once I've had a look at the current site. Best, Emrah
$118 USD in 2 days
3.2
3.2

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