Freelance Full-Stack Web App Developer

Mindrift connects specialists with innovative technology projects. Our mission is to help develop high-quality AI technologies by combining real-world expertise from professionals across the globe with advanced AI development efforts.

About The Role

This is a freelance role for the Tendem project. As a Full-Stack Web App Developer, you'll design, build, and refine browser-based applications with real logic, state, persistence, and user input — from habit trackers and budgeting tools to internal dashboards, mini-SaaS tools, and AI-powered apps. You may also work on standalone Python applications and data-processing scripts that sit alongside or behind these products.

Responsibilities

• Build interactive web applications with frontend (React, Next.js, Vue, or similar) and a backend API (Python/FastAPI/Flask or Node/Express)
• Design and implement data models, schemas, and persistence layers using SQL (PostgreSQL, SQLite) or NoSQL stores
• Implement authentication, sessions, and basic role-based access where needed
• Integrate third-party APIs and AI/LLM services (OpenAI, Anthropic, or similar) into product features
• Handle state management, user input validation, error states, and loading states cleanly
• Build standalone Python tools and scripts where required by the task (data processing, API clients, lightweight backend utilities)
• Review, debug, optimize, and refactor full-stack applications to improve correctness, security, performance, and maintainability
• Write clear, testable code and debug end-to-end issues across frontend, backend, and database

Requirements

• At least 3 years of relevant experience in full-stack web development or shipping interactive web applications (required)
• Bachelor's or Master's Degree in Computer Science, Engineering, Information Technology, or related technical fields is a plus
• Strong foundation in full-stack web development, modern frontend frameworks, backend architecture, and building interactive browser-based applications end-to-end
• Strong problem-solving skills, attention to detail, and the ability to independently architect and ship complete features
• Portfolio of shipped web applications (required)
• English proficiency: Upper-intermediate (B2) or above (required)

Skills

• Strong command of JavaScript/TypeScript and at least one modern frontend framework (React, Next.js, Vue, Svelte, or similar)
• Solid backend experience in Python (FastAPI, Flask, Django) and/or Node.js (Express, NestJS)
• Hands-on experience with relational databases (PostgreSQL, MySQL, SQLite) and basic schema design
• Experience implementing REST APIs, request validation, error handling, and authentication flows
• Familiarity with deployment platforms (Vercel, Netlify, Render, Fly.io, Railway, or similar)
• Experience integrating LLM APIs or other AI services into product features is a strong plus
• Comfortable with version control (Git) and basic testing practices
• Strong attention to detail and commitment to building working, robust products — not demos
• Self-directed work ethic with the ability to architect, build, and ship features independently

Schedule

For this project, tasks are estimated to require around 10-20 hours per week during active phases, based on project requirements. This is an estimate, not a guaranteed workload, and applies only while the project is active.

Pay

On this project, contributors can earn up to $60 per hour equivalent, depending on their level and pace of contribution. Compensation varies across projects depending on scope, complexity, and required expertise.