.NET Lead Software Engineer | Contract / B2B (Highload & Distributed Systems, Microservices) [Remote] Poland (EU work permit). Team Lead / Architect. 15+ years experience
I help product companies solve expensive engineering problems: a platform that cannot keep up with growth, a legacy monolith that slows every release, a team that must grow without losing speed, and security risks. 15+ years in software, promoted to a lead role at each of my last three companies.
How I have solved them: • Growth: designed and built a SaaS platform of 30+ microservices from scratch on .NET 10, RabbitMQ, PostgreSQL, Redis and Kubernetes, with millions of objects. • High load: scaled a public web platform with millions of users to up to 300K document checks a day at peak and 50+ requests per second. • Legacy: moved a legacy monolith onto new services step by step, without stopping the business. • Teams: led a team of 20+ at a Swiss InsurTech; now I lead a team of up to 8 engineers. Hiring, mentoring, predictable delivery. • Security: security audits of applications and infrastructure, OAuth2 / OpenID Connect, SSO, networking. • Delivery: Docker, Kubernetes, Helm, Terraform, GitLab CI, Grafana, Loki. I set up whole environments myself, including VPN and backups. • Full-stack: React, Next.js and TypeScript on top of .NET. • AI: I use AI tools every day for coding and code review, work with LLM APIs through OpenRouter, and built a personal trading system with a trained ML model on real-time market data.
Recent work: Construction-tech SaaS: designed and built 30+ microservices: authentication, billing, notifications, search, file storage with access levels and more. Full CI/CD and observability. Kasko2Go (Swiss InsurTech): built the billing system from scratch, core services and partner integrations; led a team of 20+.
What I am looking for: Remote B2B roles: Software Architect, Engineering Manager or Lead .NET / Full-Stack Engineer. Based in Poland (CET), available in 2–4 weeks.
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