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kolezka/README.md

Senior / Lead Full-Stack Engineer with 8+ years of experience building and delivering production systems across web, mobile, and backend.

Profile Views

🎯 Currently

  • Lead Full-Stack/Staff Engineer on a mobile platform for an enterprise pharmaceutical client (via STX Next) — React Native, FastAPI, Azure, operating at level
  • Senior Full-Stack Engineer (Contract) via Toptal — top 3% of engineers (2026)
  • Principal Engineer & Founder at raqz.pl — my software engineering practice

🏆 Selected past

  • Mobile Lead Engineer at DirectDental (2023–2025) — sole-dev'd the React Native app that contributed to the company's acquisition by Henry Schein (Fortune 500, NASDAQ: HSIC)
  • Senior Engineer via Sofomo (2021–2026) for US startups and scale-ups:
    • Dynamic.xyz (a16z-backed Web3 infrastructure) — multi-chain wallet SDK (Ethereum, Solana, Cosmos)
    • Globality ($310M funded autonomous sourcing platform) — frontend for Fortune 500 / Global 2000 clients
    • Willow (FemTech, $145M funded) — frontend lead on digital health platform
    • PublicSQ — frontend lead on US social marketplace

🛠️ Stack

Core: TypeScript, Python, React, Next.js, React Native, Node.js (NestJS, Fastify), FastAPI, PostgreSQL (incl. pgvector), Redis

Systems & Architecture: distributed systems, workflow engines, async processing (Trigger.dev), event-driven architecture, real-time (WebSockets, SSE), monorepos

Cloud & Infra: Azure, AWS, Docker, CI/CD, self-hosted infrastructure (Coolify, Cloudflare Tunnel, Tailscale)

Mobile: React Native + Expo, New Architecture, EAS Build, iOS/Android release pipelines, Apple enterprise distribution

AI / Data: RAG, LLM integrations (OpenAI, LangChain), embeddings & vector search, AI-augmented engineering workflows (Claude Code, custom MCP tooling)

📫 Connect

Pinned Loading

  1. NL5H00X NL5H00X Public

    Firmware analysis and modification tools. Bypass security restrictions, install custom launchers, and safely modify locked-down Chinese projector devices with comprehensive backup and recovery scri…

    Shell 7 1

  2. fastfetch-builder fastfetch-builder Public

    TypeScript 2

  3. Complete list of MSP commands and pr... Complete list of MSP commands and protocol constan for Betafl
    1 
    /**
    2 
     * MSP (MultiWii Serial Protocol) Configuration for Betaflight
    3 
     * Complete list of MSP commands and protocol constants
    4 
     * 6th December 2025
    5 
     */