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.

**Senior React / Next.js Developer Needed for 4–6 Week Contract** We’re looking for an experienced React and Next.js developer to join an existing project for a 4–6 week contract. The project is a complex web-based dashboard with multiple repositories, several third-party integrations, and a fairly involved infrastructure setup. The immediate goal is to help us catch up on outstanding deliverables, complete in-progress features, resolve bugs, and support the project through QA and release. This is best suited for a senior developer who can quickly understand an existing codebase, work independently, and contribute without requiring extensive onboarding. **Responsibilities** * Build and complete features in React and Next.js * Work across multiple repositories and shared services * Debug issues across the frontend, backend integrations, and deployment environment * Review and improve existing code where necessary * Address QA feedback and resolve bugs efficiently * Help stabilize features ahead of release * Communicate progress, blockers, and technical risks clearly * Coordinate with the existing team throughout development and QA **Required experience** * Strong professional experience with React and Next.js * Experience working in large or complex existing codebases * Comfortable navigating multiple repositories * Strong JavaScript or TypeScript skills * Experience consuming and debugging APIs * Familiarity with modern deployment and CI/CD workflows * Ability to work independently and deliver within an established project structure * Strong attention to detail during QA and release preparation **Experience with the following is a plus** * Vercel * Cloudflare Workers * Mailgun or Mailjet * Twilio SMS integrations * Email delivery and notification systems * Serverless infrastructure * Authentication and permissions for dashboard applications * Third-party API integrations * Monitoring, logging, and production debugging **Project details** * Contract length: approximately 4–6 weeks * Project type: complex website dashboard * Engagement: short-term contract, with the possibility of additional work based on project needs * Start date: as soon as possible * Work arrangement: remote When applying, please include: * A brief summary of your React and Next.js experience * Examples of complex dashboard or SaaS projects you have worked on * Experience working across multiple repositories * Any relevant experience with Vercel, Cloudflare Workers, Mailgun, Mailjet, or Twilio * Your availability over the next 4–6 weeks * Your hourly rate Please begin your proposal with the phrase **“Next.js Dashboard”** so we know you read the full posting.

Full-stack developer (Node.js/TypeScript, React) with cloud/DevOps experience, and comfortable with PostgreSQL, S3-compatible storage, and Google Cloud service accounts. This is to support solid mobile app built for dual platforms, with a full ML comparison pipeline, and the supporting infrastructure. Initial Task will be an infrastructure migration (DevOps). Second task will be several front end and backend app updates.

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.

I’m looking for an experienced Next.js developer to help update and improve my existing website. The site has already been built in Next.js, and I’m looking for someone who can work with the existing codebase not rebuild it from scratch. This will begin as a small project, but I’m looking for someone I can continue working with long-term as we add new features and make ongoing improvements. Responsibilities ● Update and improve our existing Next.js website ● Make design and content changes ● Create new pages and sections as needed ● Improve mobile responsiveness ● Optimize website speed and performance ● Fix bugs and troubleshoot issues ● Ensure SEO best practices are followed ● Deploy updates through Git/Vercel (or similar) Required Skills ● Strong experience with Next.js ● React.js ● JavaScript/TypeScript ● HTML/CSS ● Tailwind CSS (preferred) ● Git/GitHub ● Experience deploying with Vercel ● Strong attention to detail ● Excellent communication in English Bonus Skills ● Experience with Stripe integrations ● CMS experience (Sanity, Contentful, etc.) ● SEO optimization ● Experience with luxury brands or high-end website design ● UI/UX design experience What I’m Looking For ● Someone who communicates well and responds promptly ● Someone who takes pride in clean, organized code ● Someone who can make recommendations rather than simply follow instructions ● Reliable and available for ongoing work To Apply Please include: 1. Links to Next.js websites you’ve built. 2. Your portfolio or GitHub. 3. How many years you’ve been working with Next.js. 4. Your hourly rate or fixed-price estimate. 5. Your availability. 6. Please start your proposal with the word “Charleston” so I know you’ve read the entire post. I’m looking forward to building a long-term relationship with the right developer.

What you will do: (Responsibilities) - Develop and maintain frontend web applications using React, Next.js and TypeScript, leveraging an in-house design system built with TailwindCSS and Radix UI. - Integrate with internal API SDKs to fetch and manage data efficiently using our state management approach. - Develop custom React components for dynamic data presentation. - Create intuitive data visualizations to enhance user experience and present information concisely. - Contribute to our shared design system, including designing, updating, and optimizing reusable components What we need from you: (Required Skills/Abilities) - React experience with strong understanding of hooks, context, and component lifecycle - Frontend State Management for efficient data fetching and caching. - Component Architecture – Ability to design scalable, maintainable, and reusable component libraries. - Performance Optimization – Deep knowledge of: - Reducing re-renders and optimizing reconciliation - Using React Profiler and Lighthouse for performance analysis - Strong TypeScript skills for type-safe, maintainable frontend development. - CSS expertise, including experience with TailwindCSS, CSS Modules, or Styled Components.

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.

We're looking for a senior full-stack engineer to take on hands-on work across our web platform, architecting features, building APIs, and delivering polished, performant UI. Looking for someone that can do full stack but is heavy UI developmenet leaning. You'll be doing: Building full-stack features end-to-end (dashboards, booking, payments, admin tools, etc.) Modernizing existing code and reducing technical debt Node.js services, REST APIs. Performance optimization across front-end and backend CI/CD, automated testing, container-based deploys You should have: 8+ years building production web apps Strong TypeScript across a modern framework (React) Solid Node.js / Express backend experience AWS or GCP, Docker, and CI/CD experience Comfort with PostgreSQL Automated testing (Jest, Vitest, or similar) Bonus: AdonisJS, Golang