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Backend architecture
Microservices and APIs designed to handle millions of requests without unnecessary complexity.
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Senior Backend Engineer · High-traffic systems
Backend that scales with your business
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.
- years of experience
- 15+
- core languages
- 4
- first, then scale
- PoC
Technologies I work with
GET/about
Pragmatic engineering, measurable results
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.
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Data & databases
Data models, indexing and queries tuned for performance, from the first schema to production scale.
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Security & performance
Secure-by-default systems, profiled and optimised so they stay fast under real-world load.
Paweł Grzesiecki
Senior Backend Engineer
15+
years of experience
- Node.js
- Go
- PHP
- Python
- Elixir
GET/stack
Tools I trust in production
A proven set of languages and technologies I use to deliver reliable backend systems.
Node.js
Express, NestJS, Socket.io
Go
Gin, Fiber, Chi, gRPC, Asynq
PHP
Symfony, Laravel
Python
FastAPI, Flask
Databases
- PostgreSQL
- MySQL
- Redis
- Elasticsearch
DevOps & tooling
- Docker
- AWS
- Git
- CI/CD
APIs & protocols
- REST
- GraphQL
- gRPC
- WebSockets
GET/services
How I can help your product
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.
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API development
Well-designed REST and GraphQL APIs with clear contracts, documentation and automated tests that your frontend and partners can integrate with easily.
- RESTful API design
- GraphQL APIs
- Documentation & automated testing
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Cloud & infrastructure
Infrastructure that grows with demand: containerised deployments, automated pipelines and monitoring that gives you peace of mind.
- AWS / GCP deployments
- Container orchestration
- Auto-scaling & monitoring
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Database engineering
Data models and queries tuned for high traffic, from schema design and performance tuning to safe, predictable migrations.
- Schema design
- Query optimisation
- Data migrations
GET/ai
With AI or without it, depending on what your project needs
AI tools help me deliver faster, but the engineering decisions stay with me. When a project calls for it, I work just as well without them.
AI-assisted development
I use AI coding tools, vibe coding included, to speed up prototyping and routine work. My attention goes where AI can’t replace experience: architecture, security and performance.
- Faster proofs of concept
- Architecture designed by an engineer
- Security and performance kept in check
Engineering without AI
I wrote production code for years before AI assistants existed. When your policy, confidential code or the nature of the project requires it, I work entirely without AI tools.
- No AI tools when your policy requires it
- Every line written by hand
- The same process and quality
We choose the approach together during the discovery call.
GET/process
How we'll work together
A transparent process with no surprises: you always know what's being built, why, and what comes next.
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Discovery call
We talk through your goals, constraints and timeline. You get an honest assessment of what's worth building.
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Proof of concept
I validate the riskiest assumptions with a working prototype, so decisions are based on facts, not guesses.
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Development
Iterative delivery with regular demos, code reviews and tests, so you always know where the project stands.
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Launch & support
Production deployment, monitoring and hand-over documentation, plus ongoing support as your system grows.
GET/blog
Latest articles
Notes from everyday backend work: architecture, tooling and lessons learned in production.
The Digital Illusionist’s Trap: Why Vibe Coding in Microservices Leads to Architectural Chaos—and How to Tame It
Explore the risks of vibe coding in microservices. Learn how context harnesses, MCP, and contract testing prevent distributed architectural chaos.
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Ideas for Creating an API – Market Needs, Pros and Cons, and Monetization Strategies
Explore API creation: market needs, benefits, challenges, and diverse monetization strategies for maximizing tech opportunities
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Quick Guide: Creating AI Images Locally with Stable Diffusion and WebUI
Master local AI image generation using Stable Diffusion, WebUI, versatile tools, cost-saving, and optimized results with our guide
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How to convert HEIC to JPG format
Convert HEIC to JPG with ImageMagick's mogrify for compatibility and easier image manipulation
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Mastering Technical Interviews: A Focus on Backend Development
Master backend technical interviews; learn from real-life experiences and conduct effective interviews
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Generate RS512, RS384 and RS256 keys
It might seem like a simple thing - generate an RSASSA key. It is, but with snippets.
Read articlePOST/contact
Let's talk about your project
Tell me about your idea, product or technical challenge. I'll get back to you with concrete next steps.