We’re looking for an experienced Full-Stack Developer to build and refine a modern, responsive web application. You should be comfortable owning both the front end and back end, working independently, and turning clear requirements into a polished, reliable product. What You’ll Do Build and maintain the web application from front end to back end Create a clean, fast, mobile-responsive UI Develop backend functionality, APIs, and database integrations Implement user authentication and account functionality Integrate third-party APIs/services as needed Test, debug, and optimize performance Deploy and maintain the production application What We’re Looking For Strong full-stack web development experience Excellent JavaScript/TypeScript skills Experience with modern frameworks such as React/Next.js Strong backend and database experience Experience with APIs, authentication, cloud deployment, and Git Ability to write clean, scalable, well-documented code Strong communication and ability to work independently Important: We want a developer who can think through problems and recommend solutions—not someone who simply waits for step-by-step instructions. When applying, please send 2–3 examples of web apps you personally built, briefly explain your role in each, and include your availability and hourly rate.

We're looking for an experienced developer or small team to build out a Next.js/TypeScript travel industry platform. A meaningful head start already exists, real, working code and detailed specs, which we're providing so you can quote accurately and start productively rather than from a blank page. Full technical specs and existing codebase available to serious applicants upon request." The platform has two structurally separate systems: 1. Advisor / Commission Engine side Eleven real, type-checked pages already exist as a foundation (login, account picker, advisor dashboard, booking registration, supplier directory, and more), all sharing a common layout and sidebar. The work here is connecting this to live data: Airtable, MongoDB Atlas for authentication, Cloudinary, Webflow CMS, and Calendly. There's also a confirmed, spec-required admin screen (per-operator column visibility toggles) that still needs to be built. 2. Membership CRM side A real backend API already exists for creating Affiliate and Member records with atomic pairing logic. The frontend is a full build from the ground up: a Broker dashboard, an Affiliate view, two separate booking tables with different column sets, and an admin/broker panel for manually creating records (Brokers, Affiliates, Advisors, Members, Bookings). Both sides share some infrastructure (a single admin control point, shared login/routing logic), which is documented in detail. We're attaching a complete package: two written developer briefs (one per system) that clearly separate what already exists from what needs to be built, plus all existing code and the relevant spec documents. We've put real effort into making this scope accurate, please review everything attached before quoting rather than quoting off this summary alone. Given the range of technical domains involved (frontend, auth, multiple third-party integrations, an external API integration with a business partner), we're open to a solo developer but are especially interested in hearing from small teams or firms who can speak to experience across more than one of these areas.

Full-Stack Developer — EdTech Subscription Platform (Next.js + Supabase) · USA Only Overview I am building a production-grade subscription learning platform for students and parents. A complete BRD is available under NDA after initial screening. Looking for a skilled US-based developer or small team who can deliver a polished, secure, scalable product. Tech Stack (Non-Negotiable) Next.js 14 (App Router) · TypeScript strict · Tailwind CSS · Supabase (PostgreSQL + Auth + Storage) · Stripe Billing + Stripe Tax · Vercel · PostHog (self-hosted) · Resend · PDF.js WordPress, PHP, and MySQL are explicitly prohibited. Core Deliverables 1. COPPA-compliant parent-child account system — parental consent flow, 1+ child profiles per account, post-login profile picker, parent dashboard with billing and data rights controls. 2. Public marketing site — homepage, pricing, blog, FAQ, contact, and supporting pages. Full SEO, Core Web Vitals compliant, fully responsive. 3. Subscription billing — Stripe Billing + Stripe Tax, PayPal secondary, free trial, promo codes, dunning, all admin-managed without code changes. 4. Secure content library — in-browser PDF viewer, server-side dynamic watermarking, multi-filter search, favorites, download counter. 5. Educational games integration. 6. CMS and admin panel — two roles (Moderator, Super Admin), full content and subscriber management, promo codes, analytics, editable email templates. What I Provide Complete BRD (under NDA) · brand assets · all content files · all third-party service accounts · attorney-reviewed legal text before launch. What I Expect From You US-based — required Excellent understanding of COPPA compliance Full source code to my private GitHub — I retain full ownership No vendor lock-in, no proprietary frameworks Prior subscription SaaS or edtech experience preferred Fixed-price or milestone-based quote with breakdown To Apply Relevant work samples (Next.js + Supabase preferred) Estimated timeline for full scope Fixed price or milestone breakdown Confirmation you are US-based Short, specific proposals only. Generic bids will not receive a response.

Summary: We are building Sphere Inc., an AI-powered SaaS platform focused on the real estate industry. The product is currently in the MVP stage, and we are looking for a strong full-stack developer who can help us build, refine, and launch the first working version. The platform is designed to help real estate businesses automate daily operations, improve decision-making, and use AI agents to support workflows such as property management, lead handling, deal analysis, document processing, reporting, and business automation. This is not a basic website project. We are building a real SaaS product with a modern frontend, reliable backend, AI-powered workflows, and scalable AWS infrastructure. Current Project Status: The product vision and core direction are already defined. We are currently shaping the MVP workflows, user experience, and technical structure. At this stage, our main need is execution. We need someone who can help turn the concept into a working MVP that can be tested with real users. Some workflows are still being refined, so we are looking for a developer who can contribute both technically and practically — not just write code from fixed tickets. Current Progress & Bottlenecks We have a clear direction, but need support with - Structuring the MVP architecture - Building the frontend and backend features - Designing practical AI agent workflows - Connecting AI features with real estate data and user actions - Setting up AWS infrastructure for development and deployment - Creating a clean experience for non-technical business users - Prioritizing the most important MVP features The main bottleneck right now is moving from concept/prototype stage into a stable, usable product. We are looking for someone who has experience with - Building SaaS products from MVP to production - Full-stack development with Python, Node.js, JavaScript, and TypeScript - Frontend development using React, Next.js, or similar frameworks - Backend APIs, database design, authentication, and user roles - AI agents, LLM integrations, workflow automation, or RAG - AWS deployment, storage, monitoring, and security - Real estate platforms, CRMs, property data, document workflows, reporting, or automation tools - Writing clean, maintainable, and scalable code Tech Stack: Python, Node.js, JavaScript/TypeScript, React or Next.js, PostgreSQL, AWS, REST APIs, and AI/LLM tools such as OpenAI, Anthropic, AWS Bedrock, LangChain, LangGraph, or similar frameworks. Responsibilities: - Build frontend and backend features for the MVP - Design and implement AI-powered workflows and agent features - Connect APIs, databases, authentication, and user roles - Set up or improve AWS infrastructure - Help prioritize features and identify technical risks - Communicate progress clearly and regularly Some Knowledge That Is a Plus: - Real estate CRM, property management, brokerage, acquisitions, or leasing platform experience - AWS Bedrock, LangChain, LangGraph, or vector databases - Multi-tenant SaaS architecture - Stripe or subscription billing - DevOps, Docker, CI/CD, and testing - Analytics dashboards, reporting tools, or document automation The ideal candidate is a reliable full-stack developer who can work independently, understand the product vision, ask smart questions, and help us make practical technical decisions during the MVP stage. We need someone who is comfortable in an early-stage environment and can help turn a clear idea into a working SaaS product for real estate users. Please include: 1. Your GitHub, portfolio, or examples of previous work 2. A brief description of your related SaaS experience 3. Examples of AI agent, AI automation, or LLM-powered products you have built 4. Your AWS experience 5. Any real estate platform, CRM, data, or automation experience 6. Your availability and preferred working style We are looking for someone who can help us build the MVP now and potentially continue with us as the platform grows.

We're building the next platform for SBL Nova, a company that already monitors tens of billions of dollars in securities collateral for banks, broker-dealers, and RIAs. The next version of that platform needs to handle collateral that lvives on-chain — tokenized real-world assets, stablecoin settlement, and AI agents that can act on risk in real time instead of just flagging it. We're not hiring someone to build this from a spec doc or a Figma file. We already built a working prototype ourselves — a real Next.js 16 / React 19 / TypeScript app with actual client-side state, a working wallet connect/disconnect flow, a live approve/deny queue for agent actions, working search and filtering, and a functioning notifications inbox. It runs with zero API keys or backend — clone it, npm install, npm run dev, and you can click through the whole thing in under a minute. What it doesn't have yet — and what we need you for — is everything below the surface: - Wiring up a real ERC-4337 smart wallet (ZeroDev, Alchemy Account Kit, or Safe) behind our existing wallet context, replacing our mocked address with a live, session-key-scoped account - Building a real policy engine for our "agentic ops" screen — the UI for approving/denying agent actions already exists, it just needs actual agents behind it reading live testnet events - Pulling real on-chain data into our collateral registry and activity feed via an indexer (The Graph) or an RPC provider (Alchemy/Infura) Standing up and auditing the actual smart contracts our security registry currently mocks (think Slither, Foundry, Echidna) - Replacing our AI risk-scoring mocks with a real model — even a solid heuristic or scikit-learn baseline on real testnet transactions would be a big step up - Adding real authentication, role-based access, and a persistence layer (API + database) so this isn't just in-memory React state anymore What we're looking for: - Someone comfortable across the full stack — Next.js/React/TypeScript on the frontend, and confident building real backend services and APIs - Solid hands-on experience with EVM chains (we're targeting Ethereum, Arbitrum, and Polygon zkEVM) and account abstraction / smart wallets - Experience writing or auditing Solidity contracts, or working closely with a security process (Slither/Foundry/Echidna/Certora are all fair game) - Some real AI/ML experience — not "I used ChatGPT," but building and shipping actual models or pipelines, even simple ones - Someone who can look at existing code, understand the shape of a half-built system, and just start extending it — not someone who needs a fully specced ticket for every step How we'll work together: We'll give you the full prototype repo up front so you can see exactly what's already built and exactly where the mocked pieces are. From there we'd want to move in scoped chunks — smart wallet integration first, then the policy engine, then real data feeds — rather than one giant undefined project. Ongoing engagement if it's a good fit, with clear milestones so both sides know where things stand. Looking forward to hearing from you!

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.

We have a healthcare platform that is already in use and are looking for a senior Full Stack Developer to help us review and improve a specific area of the product. This initial task is expected to take around 1–2 hours for an experienced developer and will focus on understanding the current setup, identifying the root cause of an issue and making the right improvement without unnecessary changes. If the collaboration goes well, there will be opportunities to continue supporting the platform as new features, improvements and technical challenges come up. As the platform grows, we are seeing the kind of real-world challenges that come after launch: workflows that need refinement, areas where data flow can be improved, integrations that need attention and new features that require changes across the frontend, backend and database. We are looking for someone who can understand the full system, build thoughtful solutions with technologies like React, TypeScript, Node.js, PostgreSQL and APIs and help us make reliable improvements without creating unnecessary complexity. Experience with healthcare applications, patient portals, SaaS platforms or workflow-based systems is a strong plus. We are also exploring AI-powered improvements such as medical document processing, intelligent search, patient data organization, workflow automation and LLM-based features that can reduce manual work and improve the overall healthcare experience. Experience integrating AI APIs or building AI-assisted products would be valuable.

𝗔𝗯𝗼𝘂𝘁 𝘁𝗵𝗲 𝗣𝗿𝗼𝗷𝗲𝗰𝘁: I'm building a modern SaaS workspace and ticket management platform focused on providing a clean, intuitive alternative to traditional ticketing software. The product definition is substantially complete. A comprehensive Product Requirements Document (PRD) and detailed Figma designs have already been prepared, allowing development to begin from a well-defined product foundation. Version 1 will initially be developed as a Shopify app. The architecture should be designed with modularity in mind so the platform can later evolve into a standalone web application with maximum code reuse. 𝗪𝗵𝗮𝘁 𝗬𝗼𝘂'𝗹𝗹 𝗗𝗼: The first milestone will focus on planning—not coding. You'll review the PRD and Figma designs, then propose: ★ System architecture ★ Database design (ERD) ★ Recommended technology stack ★ Infrastructure approach ★ Project milestones ★ Development timeline and estimates Once these proposals are reviewed and approved, development will proceed through fixed-price milestones. 𝗪𝗵𝗮𝘁 𝗜'𝗺 𝗟𝗼𝗼𝗸𝗶𝗻𝗴 𝗙𝗼𝗿: ★ Senior full-stack engineering experience building SaaS applications ★ Experience architecting applications from the ground up ★ Strong backend and database design experience ★ Experience designing scalable systems ★ Excellent communication and planning skills ★ Shopify app experience is preferred but not required 𝗣𝗿𝗼𝗷𝗲𝗰𝘁 𝗗𝗲𝘁𝗮𝗶𝗹𝘀: ★ Product Requirements Document provided ★ Detailed Figma designs provided ★ Fixed-price milestone project ★ Long-term opportunity for the right person ★ Code will be committed to a GitHub repository owned by the client I'm looking for someone who enjoys solving complex technical problems, communicates clearly, and takes pride in building scalable, maintainable software.

We run a live web platform used daily by dental clinics to manage their front desk — capturing leads, booking consults, and handling patient records. The engineering underneath is solid; what it needs now is a front-end that feels effortless. That is your job. This is a taste role, not an hours role. We are looking for a US-based senior product engineer who knows what an American professional user expects, has genuine UX judgment, and can ship high-quality interfaces fast using modern AI tooling. You will own the entire look and feel of the product as we scale toward a multi-clinic US rollout. WHAT YOU'LL OWN - The full front-end / UX layer: information architecture, layout, hierarchy, scannability, component consistency, and interaction. - Making the complex feel simple — a busy staffer should open the app and instantly know what to do next. Benchmark against the leading commercial platforms and beat them on usability. - Shipping fast with AI tooling (Cursor / Claude / v0 / Copilot) without leaving behind unmaintainable code. - A clean handoff with the backend team: you consume typed data and server actions; you never touch the database directly. - Iterating on a live product against real user feedback, week over week. THE STACK (matters for fit) Next.js App Router (monorepo, pnpm) on Vercel, TypeScript (strict), Tailwind + shadcn/ui, React server and client components, server actions, Clerk auth, Drizzle/Postgres behind a typed service layer. You own the UI/presentation layer; an offshore team owns the data, services, and integrations. The front/back boundary is already clean and type-enforced. MUST-HAVES - US-based, senior, with a portfolio of genuinely intuitive product UI (SaaS / dashboards / internal tools — not marketing sites). - Strong Next.js App Router specifically — server vs client components, server actions, working inside a TypeScript monorepo. This is NOT a classic React SPA + REST role. - Strong TypeScript and Tailwind (shadcn/ui a plus); ships production-grade, maintainable code. - Real product/UX taste — you can take something clunky and make it feel effortless, and explain why it is better. - Fluent with AI-assisted development and a point of view on using it well (speed without slop). - Native US-user sensibility and self-direction — you can own a lane with light oversight. NICE-TO-HAVES - Healthcare / practice-management / booking / scheduling / HIPAA-aware experience. - Design-system / component-library discipline; Figma-to-code fluency. - Startup / 0-to-1 speed. ENGAGEMENT Ongoing, long-term contract. Part-time and capped hours (roughly 15–25 hrs/week to start) with a minimum weekly commitment so availability is reliable. We are deliberately trading fewer hours of a strong senior engineer for taste and speed. TO APPLY, PLEASE ANSWER 1. Link 1–2 products where you owned the front-end/UX. Point to something you made dramatically more intuitive and explain the thinking. 2. How do you use AI coding tools in your workflow, and how do you keep AI-generated UI maintainable at scale? 3. Describe a before/after where you took something complex and made it feel simple. 4. Your US timezone, weekly availability, and hourly rate.

Contract Full Stack Engineer – Manufacturing Data Platform Development Overview We are seeking an experienced full stack software engineer to design and implement a cloud-based manufacturing data platform to support device production testing, quality tracking, and manufacturing analytics. Our current manufacturing test workflow uses a Windows-based test application that logs production test data into Google Sheets. As we scale production and introduce contract manufacturing, we are transitioning to a structured cloud database architecture using Supabase and PostgreSQL. The contractor will be responsible for establishing the backend data infrastructure, assisting with integrating existing manufacturing test software with the new platform, and developing flexible data visualization and analytics tools for engineering and manufacturing teams. This is an opportunity to build a foundational manufacturing data system that will support production scaling, quality improvements, and future automation. Scope of Work 1. Database Architecture & Supabase Implementation Design and implement a production-ready database architecture using: Supabase PostgreSQL REST APIs Cloud-based authentication and security Responsibilities include: Define database schema for manufacturing test data Create tables and relationships for: - Device serial numbers - Production lots - Firmware versions - Hardware revisions - Test results - Calibration data - Operator information - Failure codes - Manufacturing history - Implement database indexing and optimization - Establish backup and data retention strategies - Configure user access permissions for internal teams and manufacturing partners 2. Manufacturing Test Software Integration Our existing Windows test application currently performs device testing and uploads results to Google Sheets. The contractor will: -Assist team members with replacing Google Sheets API integration with database/API integration -Develop secure REST API endpoints -Integrate authentication between the test application and backend -Design reliable data upload workflows -Handle offline operation and data synchronization considerations -Ensure robust error handling and logging Preferred experience: -C# / .NET desktop applications (current data gathering tools) -REST API development -Cloud database integration 3. Manufacturing Dashboard & Data Analytics Platform -Develop an intuitive interface for engineering, manufacturing, and quality teams. The platform should provide: High-Level Production Dashboards Examples: -Units tested per day/week/month -Production throughput -Pass/fail rates -First pass yield -Failure trends -Failure Analysis Tools Ability to analyze: -Failure categories -Failed test steps -Firmware correlation -Hardware revision correlation -Production lot trends -Time-based trends -Flexible Data Exploration The system should provide spreadsheet-like flexibility similar to Google Sheets pivot tables. Desired capabilities: -Dynamic filtering -Sorting -Grouping -Pivot-style summaries -Custom reports -Export capability (CSV/Excel) -User-defined views The implementation can be: -Web application -Desktop Windows application -Hybrid solution The priority is flexibility, maintainability, and ease of use by engineering teams. Technical Requirements Required experience: -PostgreSQL database design -Supabase platform experience -REST API development -Full stack application development -Data visualization/dashboard development -Cloud application architecture -Authentication and user management Preferred experience: -Quality systems -Production test software -Electronics manufacturing data -Statistical process control (SPC) -Yield analysis Preferred Technology Experience Backend: -PostgreSQL -Supabase -REST APIs -Python, Node.js, C#, or similar backend technologies Frontend: -React / Next.js -TypeScript -Dashboard frameworks -Data visualization libraries Desktop (optional): -C#/.NET -WPF -WinUI Analytics: -SQL reporting -Data aggregation -Pivot-style analysis tools Deliverables Phase 1 – Database Foundation -Supabase project setup -Database schema -Authentication system -API architecture documentation Phase 2 – Test Software Integration -Updated Windows tester integration -Data upload API -Error handling -Production validation Phase 3 – Manufacturing Dashboard -Production overview dashboard -Yield reporting -Failure analysis interface -Flexible data exploration tools Phase 4 – Documentation & Handoff -Database documentation -API documentation -Deployment instructions -Training for internal engineering team Contract position: Estimated duration: 3–6 months initially -Potential for ongoing support as manufacturing systems expand -Remote acceptable Ideal candidate: -Independent engineer comfortable owning architecture decisions -Able to work directly with engineering leadership -Comfortable building an initial system quickly while maintaining long-term scalability About the Product We are developing a battery-powered consumer electronics device transitioning from engineering prototypes into scaled manufacturing. The manufacturing data platform will become a critical component of our production infrastructure, supporting internal engineering teams and external manufacturing partners.