Artur Przychodzeń
Senior Engineer turning ideas into working product
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KSeF System — full-stack application for managing and submitting invoices to Poland's mandatory National e-Invoice System. Features a web dashboard (Thymeleaf + HTMX) with invoice pipeline tracking, PDF import via custom parser, and complete submission lifecycle: FA_VAT XML generation, XAdES digital signature, OAuth2 authentication, and government API integration. Built with DDD across 8 modules including offline mode with automatic retry queue and a CLI tool for batch processing.
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Automated code review platform that integrates with GitHub via webhooks. When a PR is opened, the system fetches changes, runs static analysis (security + performance), retrieves historical context using RAG (pgvector), and uses LLM agents to generate actionable findings — published directly as inline GitHub comments.
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