I'm Paweł Grzesiecki, a backend engineer with over 15 years of experience. I design and build fast, secure and maintainable server-side systems in Node.js, Go, PHP and Python, ready for real production traffic.
I believe the best solutions are the simple ones. That's why every project starts with a proof of concept: we validate ideas quickly and cheaply, before investing in full-scale development.
Over 15 years I've worked with Node.js, PHP, Python, Go and Elixir, delivering systems for clients where handling heavy user traffic was business-critical. I focus on architecture that is easy to understand, test and grow, so your team can keep moving fast long after launch.
Microservices and APIs designed to handle millions of requests without unnecessary complexity.
Data models, indexing and queries tuned for performance, from the first schema to production scale.
Secure-by-default systems, profiled and optimised so they stay fast under real-world load.
A proven set of languages and technologies I use to deliver reliable backend systems.
Express, NestJS, Socket.io
Gin, Fiber, Chi, gRPC, Asynq
Symfony, Laravel
FastAPI, Flask
From the first API endpoint to a production platform serving heavy traffic, I take care of the backend so you can focus on your business.
Well-designed REST and GraphQL APIs with clear contracts, documentation and automated tests that your frontend and partners can integrate with easily.
Infrastructure that grows with demand: containerised deployments, automated pipelines and monitoring that gives you peace of mind.
Data models and queries tuned for high traffic, from schema design and performance tuning to safe, predictable migrations.
A transparent process with no surprises: you always know what's being built, why, and what comes next.
We talk through your goals, constraints and timeline. You get an honest assessment of what's worth building.
I validate the riskiest assumptions with a working prototype, so decisions are based on facts, not guesses.
Iterative delivery with regular demos, code reviews and tests, so you always know where the project stands.
Production deployment, monitoring and hand-over documentation, plus ongoing support as your system grows.
Tell me about your idea, product or technical challenge. I'll get back to you with concrete next steps.