Freelance Full-Stack Web App Developer

Mindrift

1d • Remote

About The Position

Mindrift is seeking skilled Full-Stack Web App Developers with expertise in JavaScript/TypeScript and Python or Node.js to join the Tendem project. The role involves building interactive browser-based applications for real-world use cases, applying full-stack engineering skills to design, build, and maintain functional, robust, and user-friendly web applications. This is a part-time, remote opportunity for professionals experienced in modern frontend frameworks, backend APIs, databases, and end-to-end web product development. The Mindrift platform connects specialists with innovative technology projects, aiming to develop high-quality AI technologies by combining global professional expertise with advanced AI development. As a freelance developer for the Tendem project, you will design, build, and refine browser-based applications with logic, state, persistence, and user input, including habit trackers, budgeting tools, internal dashboards, mini-SaaS tools, and AI-powered apps. You may also develop standalone Python applications and data-processing scripts.

Requirements

• At least 3 years of relevant experience in full-stack web development or shipping interactive web applications (required).
• 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).
• 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.
• Portfolio of shipped web applications (required).
• English proficiency: Upper-intermediate (B2) or above (required).

Nice To Haves

• Bachelor's or Master's Degree in Computer Science, Engineering, Information Technology, or related technical fields is a plus.
• Experience integrating LLM APIs or other AI services into product features is a strong plus.

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.

Benefits

• Work fully remote on your own schedule with just a laptop and stable internet connection.
• Apply your expertise to real-world technology projects while gaining experience building high-quality solutions for a global platform.
• Participate in performance-based bonus programs that reward high-quality work and consistent delivery.

What This Job Offers

• Job Type: Part-time
• Career Level: Mid Level
• Education Level: Associate degree