Freelance Full-Stack Web App Developer

Overview

About the Role

Key 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).
• Evaluate AI-generated full-stack code and refactor it for correctness, security, performance, and maintainability.
• Write clear, testable code and debug end-to-end issues across frontend, backend, and database.

Requirements

• and benefits
• 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
• Candidates should have a strong foundation in full-stack web development, modern frontend frameworks, backend architecture, and building interactive browser-based applications end-to-end. We are looking for specialists who can confidently work across frontend, backend, databases, and APIs, design robust application logic, and refine AI-assisted output into production-ready products.
• Strong problem-solving skills, attention to detail, and the ability to independently architect and ship complete features are essential
• 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
• Portfolio of shipped web applications (required)
• English proficiency: Upper-intermediate (B2) or above (required)
• Project time expectations
• 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.

Compensation

Compensation

• varies across projects depending on scope, complexity, and required expertise.
• Please note that other projects on the platform may offer different earning levels based on their requirements.
• Why this freelance opportunity might be a great fit for you?
• Work fully remote on your own schedule with just a laptop and stable internet connection.
• Gain hands-on experience in a unique hybrid environment where human expertise and AI agents collaborate seamlessly a distinctive skill set in a rapidly growing field.
• Participate in performance-based bonus programs that reward high-quality work and consistent delivery.