Freelance Software Development Services
I’m Andrej Gajdos, a freelance full-stack developer and software architect with 10+ years building and scaling web applications for startups through fortune 500 companies, including Apple and Binance. Depending on what your project needs, I step in as a hands-on developer, a specialist consultant, or a technical leader. Below is how I can help, follow any service for details, case studies, and pricing.
Development
Hands-on building from a first MVP to a production system at scale.
- Custom MVP development – Have an idea but no product yet? I take startups from concept to a launched MVP, choosing the right minimal feature set and a stack that won’t slow you down.
- Node.js & back-end development – APIs, integrations, and back-end systems built to scale. I’ve optimized Node.js platforms from tens of thousands to over a million users.
- Chrome extension development – Custom browser extensions, from API integrations to detection-resistant tools, built and shipped to the Chrome Web Store.
- Leaflet & map development – High-performance interactive maps and geospatial apps in React and Leaflet.js, handling large datasets without slowing down.
Consulting & Technical Leadership
Senior guidance when you need judgment, not just hands.
- Fractional CTO – Part-time technical leadership for startups: roadmap, architecture, hiring, and code quality, without a full-time hire.
- Software Architect – Design scalable, maintainable systems and fix performance bottlenecks before they get expensive.
- React.js consulting – Expert help with React architecture, performance, and best practices for your team.
- JavaScript consulting – Framework-agnostic JavaScript, Node.js, and TypeScript expertise for complex web apps.
- Front-end consulting — UI architecture, design systems, and front-end performance for teams that need to level up.
Want proof? Browse my full portfolio of 20+ delivered projects or get in touch to talk through what you’re building.