We have an existing React.js website and need help fixing one small responsive UI issue. The page is already built and functioning correctly, but the header/navigation does not display properly on mobile devices. On smaller screens, the navigation links overflow the container and the menu button is slightly misaligned. We will provide the current source code and a screenshot showing how the mobile header should look to the selected candidate. This is a very small frontend task and should only require changes to one component and its related CSS. The final result should display correctly on both desktop and mobile without horizontal scrolling or overlapping elements.

We are seeking an elite, senior-level Full-Stack Developerto engineer a high-velocity, real-time horse racing web platform from the ground up. The core application loop revolves around a fast-paced snake draft for individual horse races, complete with an integrated, synchronized sub-second live video stream of the race. Following official track results, the platform automatically executes structured financial payouts to users using Venmo/PayPal Payout rails. The entire tech stack must be built utilizing a unified all-JavaScript environment (MERN stack) optimized to eliminate database race conditions and handle volatile real-time traffic spikes. Core Key Milestones & Project Deliverables: Milestone 1: Backend Infrastructure & User Security (15%) Set up a Node.js/Express.js application environment and establish a scalable MongoDB Atlas architecture. Implement user registration, secure JWT/bcrypt authentication, profile management, and verified phone-number registration and/or email registration. Milestone 2: Sports Data Ingestion & Automation (25%) Establish integration with a third-party commercial horse racing API (e.g., Equibase or Sportradar). Build persistent background workers (using BullMQ, Redis, or Node-Cron) to automatically ingest daily race cards, scratches, gate changes, and final official race metrics. Milestone 3: Real-Time Draft & WebRTC Video Integration (40%) Develop an interactive React.js draft dashboard utilizing Socket.io for live, synchronized state management. Implement our custom mathematical snake draft logic featuring a strict 20-second user-pick countdown timer. Build server-side automatic timeout handlers to auto-assign choices if a user disconnects or freezes. Embed an ultra-low latency HTML5 video canvas layer leveraging WebRTC (via WHIP/WHEP protocols) to ingest an RTMP stream from a media server (e.g., Ant Media or Wowza) ensuring sub-500ms video playback. Milestone 4: Venmo Payout Integration & Compliance Guardrails (20%) Seamlessly integrate the official PayPal/Venmo Payouts API to programmatically distribute money from our platform wallet directly to users' accounts and/or phone numbers. This can be worked around using a p2p format, if necessary due to compliance and regulation. Code a reliable system ledger that deducts a custom platform percentage rake prior to finalizing winner distributions. Implement an IP geo-fencing gateway (such as MaxMind GeoIP2) to block real-money contest entry from illegal jurisdictions. Technical Stack Requirements: Frontend: React.js (Next.js preferred), Tailwind CSS, Socket.io-client. Backend: Node.js, Express.js, Socket.io, Node-Cron or BullMQ.Database & Memory: MongoDB (Mongoose), Redis (for lightning-fast leaderboard and timer caching). Streaming Protocols: WebRTC, WHIP/WHEP, RTMP stream handling. Integrations: PayPal/Venmo Payouts SDK, REST/JSON Sports Data APIs, GeoIP lookup utilities. Strict Operational Code Quality Terms: 1. Repository Ownership: All codebase code and architectural modules must be pushed to our private company GitHub repository at least three times a week. Milestone releases will only be approved after clean local compilation and inspection. 2. IP Assignment: By applying for and accepting this position, you acknowledge that 100% of the developed application logic, system schemas, and code components represent a dedicated Work-for-Hire owned exclusively by the client. 3. ACID Database Transactions: You must guarantee and demonstrate via unit testing that the MongoDB schema handles marketplace swaps and concurrent drafting selections via absolute ACID Transaction Sessions to totally prevent double-spend or double-draft race conditions. To Apply, Please Answer the Following 3 Screening Questions: 1. How do you plan to structure the server environment and React architecture to keep a 30-second live countdown timer perfectly synced down to the millisecond for 4 or more different players concurrently browsing via WebSockets? 2. Please share a summary or a live link of a project you built from scratch that handled live WebRTC ultra-low-latency video delivery or complex stream handshakes. 3. What is your specific experience with financial ledger architectures? Explain how you intend to protect the MongoDB operations against multi-user transactional conflicts.

About the Role: Lumina AI is an interactive companion & educational platform with a live Next.js web application running in production. We need an experienced Cross-Platform Mobile Developer to package our web app into native iOS and Android builds, configure native microphone permissions, and set up Apple TestFlight & Google Play Internal Testing. Key Deliverables: Mobile App Packaging: Wrap live Next.js app using Capacitor or React Native for iOS/Android with 100% feature parity. Native Permissions: Configure iOS/Android microphone permission bridges so real-time voice features work seamlessly without browser loops. Apple Connect (iOS): Signed .ipa, provisioning profiles, TestFlight setup, ATT & AI disclosures. Google Play (Android): Signed .aab, keystore management, Internal Testing track, Data Safety forms. Store Support: Assist with Apple/Google review feedback to ensure store approval. Qualifications: Proven track record wrapping React/Next.js apps & publishing to App Store/Google Play. Deep experience with native iOS/Android microphone stream permissions. Up-to-date with Apple ATT/AI policies & Google Data Safety requirements. Budget & Timeline: $500 Fixed-Price | 5–7 Days to Beta Build

I'm the founder of a social group-planning app for deciding where to go out with friends. The frontend is already built and deployed: Next.js, TypeScript, Tailwind, hosted on Vercel. I'm looking for one experienced developer to take it from working prototype to App Store. Scope (this is the whole engagement): 1. Code and security review of the existing codebase, flag the top risks 2. Replace localStorage with a real backend: database, auth, and API (Supabase or Firebase preferred) covering auth, profiles, friends, group sessions, ratings, and notifications 3. Wrap the app for iOS using Capacitor and get it running in TestFlight 4. Support through App Store submission and review Not in scope: new features, redesigns, or a rebuild from scratch. The product is feature-frozen for launch. Requirements: US-based Strong React/Next.js and TypeScript experience Has personally shipped at least 2 apps currently live in the App Store (send links) Experience with Supabase or Firebase Capacitor experience a plus How I'll hire: shortlisted candidates get repo access after signing an NDA and IP assignment. I'll ask you to spend 30 minutes in the code and tell me the 3 biggest risks you see. Contract is milestone-based: 30% backend live, 40% iOS build in TestFlight, 30% App Store approved. Please include: links to your 2 shipped apps, your estimated timeline for this scope, and a fixed-price bid.

We are looking for an experienced full-stack developer with strong expertise in React Native and backend development to help identify, troubleshoot, and resolve several issues in our production mobile application. The application is already live, but users are experiencing intermittent problems related to API communication, authentication, and data synchronization. The ideal candidate should be comfortable analyzing both the React Native frontend and the backend services to determine the root cause of bugs rather than simply applying temporary fixes. Your responsibilities will include reviewing the existing codebase, debugging REST API requests and responses, identifying issues related to authentication (JWT/OAuth), investigating server-side errors, optimizing database queries where necessary, fixing inconsistent data returned by the APIs, and ensuring proper error handling throughout the application. You will also be expected to diagnose performance bottlenecks, improve response times, resolve crash reports, and ensure seamless communication between the mobile client and backend services. Experience with Node.js, Express.js or NestJS, PostgreSQL or MongoDB, Firebase, Git, and API testing tools such as Postman is highly desirable. In addition to resolving the current issues, we expect clean, maintainable code that follows industry best practices. Please document the problems you identify, explain the solutions implemented, and provide recommendations for preventing similar issues in the future. Strong debugging skills, attention to detail, and excellent communication are essential. This project may lead to long-term collaboration for future feature development, maintenance, and application enhancements if the initial engagement is successful.

Join our team to develop a social travel app, Kite, using React Native (Expo), Node.js, TypeScript, and PostgreSQL. You'll work on both mobile and backend development, enhancing user experience and implementing new features. Collaborate with our team to ensure seamless integration and high-quality delivery. This is a part-time, ongoing project with a focus on innovation and user engagement.

We're looking for an experienced Full-Stack Web Development Consultant to provide technical guidance on modern web applications. Tech Stack: React Node.js Python AWS Docker AI/LLMs (OpenAI, Claude, Gemini, LangChain, RAG, AI Agents) Requirements: 5+ years of full-stack development experience Strong architecture and problem-solving skills Excellent communication Project Type: Short-term Payment: Fixed price per consultation session Please include a brief summary of your relevant experience when applying.

Title: Full-Stack SaaS Developer — React + Supabase + Stripe + Anthropic Claude API Description: We are building FreightSignal — an AI-powered freight sales intelligence platform for logistics professionals. The core product is already live at freightsignal.net with a working signal scanner, territory map, partner network page, and marketing site. We need a full-stack developer to build Phase 2: the complete SaaS dashboard with auth, payments, and core product features. What you'll build: User authentication and account management (Supabase Auth, single session security, login notifications) Signal intelligence dashboard — HOT/WARM/WATCH daily lead feed with AI-written outreach per signal Stripe subscription billing ($34/mo and $149/mo plans, 14-day trial, customer portal) Territory configuration — city radius, freight mode, cargo verticals, score threshold Simple pipeline tracker — 6 stages, CSV import, one-click Excel export FreightSignal Connect tab — exclusive partner network, document uploads, admin approval, AI matching Territory intelligence map integration — geofence alerts, trip outreach mode, mobile responsive Customs push engine — CBP AMS data processing, new importer signal cards Tech stack required: React + Tailwind CSS, Python FastAPI or Node.js Express, Supabase (PostgreSQL + Auth + Storage), Stripe, Anthropic Claude API, Netlify + Railway or Render, Leaflet.js + CartoDB What's already built: Live marketing site, working Python signal scanner (120+ RSS feeds), territory map HTML, partner network page, Privacy Policy. You are building the dashboard and SaaS infrastructure around these. What we're looking for: Strong portfolio showing React + Supabase + Stripe SaaS builds Experience with Anthropic or OpenAI API integration Ability to work milestone-based — not open-ended hourly Interest in ongoing work — Phase 3 features available after Phase 2 launch Clear English communication — you will work directly with the founder Budget: $9,500–$17,000 fixed price (milestone-based payments) Timeline: 8–12 weeks Engagement: Looking for a long-term partner, not a one-time hire To apply: Share relevant portfolio links showing SaaS work with auth, billing, and API integrations. Include your fixed price quote and estimated timeline. Detailed technical brief shared after initial screening.

I am building an AI automation system for roofing companies and need an experienced developer to help build the first version. The system will help roofing companies: - Capture and qualify leads automatically - Follow up with missed calls/texts - Schedule appointments - Use AI chat/voice automation - Track leads in a simple dashboard/CRM I already have the business model and sales strategy. I need a developer who can help turn the idea into a working product. Requirements: - Experience with AI automation - Experience with APIs (OpenAI, Twilio, etc.) - Experience building web applications - Ability to create clean, scalable systems - Good communication Preferred skills: - React/Next.js - Node.js - Python - Database experience - AI agent development I am looking for someone who could potentially become a long-term development partner as this grows. Please include: 1. Examples of AI systems you have built 2. Your preferred tech stack 3. How you would approach building this system 4. Your estimated timeline

We’re looking for an experienced Full Stack Developer to join our team on a project basis with potential for ongoing work. You should be comfortable working across both frontend and backend development, building reliable, scalable, and production-ready web applications. What You’ll Work On Develop and maintain full-stack web applications Build responsive, modern frontend interfaces Develop APIs, backend logic, and database integrations Integrate third-party APIs and services Debug, optimize, and improve existing applications Implement authentication, user roles, dashboards, and other application features Work with existing codebases and improve architecture where needed Ensure applications are secure, scalable, and performant Collaborate with our team on requirements, development, testing, and deployment Required Skills Strong experience with JavaScript / TypeScript Strong frontend experience with React / Next.js Backend development with Node.js / PHP / Laravel or similar Experience with REST APIs and third-party integrations Strong database experience with PostgreSQL, MySQL, or similar Git/GitHub and modern development workflows Experience deploying and maintaining production applications Ability to understand an existing codebase and troubleshoot issues independently Nice to Have Experience with Supabase Experience with AWS, Vercel, or similar cloud platforms Experience building SaaS applications AI/API integrations Mobile app development experience Experience with payment systems such as Stripe Strong understanding of UI/UX and responsive design What We’re Looking For We want someone who can take ownership of tasks, communicate clearly, think through problems independently, and deliver clean, maintainable code. Please apply with: A brief introduction about yourself Your relevant Full Stack experience 2–3 similar projects you’ve worked on Your preferred hourly rate Your weekly availability Links to your GitHub, portfolio, or relevant work We’re looking for quality and reliability, not just someone who can write code. This can become a long-term opportunity for the right developer.