Freelance Full-Stack Web App Developer

Team: IT

Location: Brazil

Commitment: Part-time

Workplace Type: remote

Accountabilities:

The Full-Stack Web App Developer will be responsible for designing, developing, and improving complete web applications while ensuring quality, performance, security, and maintainability throughout the development lifecycle.

• Build interactive browser-based applications using modern frontend frameworks such as React, Next.js, Vue, Svelte, or similar technologies.
• Develop backend APIs and application logic using Python frameworks such as FastAPI, Flask, Django, and/or Node.js frameworks such as Express or NestJS.
• Design and implement database structures, schemas, and persistence solutions using SQL or NoSQL databases.
• Create application features involving authentication, sessions, role-based access, and secure user flows.
• Integrate third-party APIs and AI/LLM services into application features and workflows.
• Develop standalone Python tools, scripts, and backend utilities when required.
• Implement frontend state management, user validation, error handling, and optimized user experiences.
• Review, debug, refactor, and improve existing full-stack applications to enhance reliability and performance.
• Write clean, maintainable, and testable code while troubleshooting issues across frontend, backend, and database layers.
• Independently design and deliver complete features from concept to production-ready implementation.

Requirements:

The ideal candidate should have strong full-stack development experience and the ability to independently create and deliver complete web applications. The role requires technical versatility, problem-solving skills, attention to detail, and experience working with modern development tools and architectures.

• Minimum 3 years of professional experience in full-stack web development or building interactive web applications.
• Strong knowledge of JavaScript and/or TypeScript with experience using modern frontend frameworks such as React, Next.js, Vue, or similar.
• Solid backend development experience with Python (FastAPI, Flask, Django) and/or Node.js (Express, NestJS).
• Experience designing and consuming REST APIs, including request validation, authentication flows, and error handling.
• Hands-on experience with relational databases such as PostgreSQL, MySQL, or SQLite and basic schema design.
• Familiarity with deployment platforms such as Vercel, Netlify, Render, Railway, or similar services.
• Experience integrating AI services, LLM APIs, or third-party APIs into applications is a strong advantage.
• Comfortable using Git and applying basic software testing practices.
• Experience building and shipping production-ready web applications, supported by a strong portfolio.
• Ability to work independently, manage priorities, and deliver high-quality solutions with minimal supervision.
• Upper-intermediate English proficiency (B2 or above).
• Bachelor’s or Master’s degree in Computer Science, Engineering, Information Technology, or related technical fields is a plus.

Benefits:

• Fully remote freelance opportunity with flexible scheduling.
• Estimated workload of approximately 10–20 hours per week during active project phases.
• Compensation of up to $30 per hour equivalent, depending on experience and contribution level.
• Opportunity to work on real-world technology projects and build innovative digital solutions.
• Exposure to modern web development practices, AI integrations, and emerging technologies.
• Performance-based bonus opportunities rewarding quality work and consistent delivery.
• Flexibility to manage your work environment with only a laptop and stable internet connection required.