Kajetan Chmielinski

I’m a Senior .NET Developer with 10+ years building complex systems—from modern event-driven banking to integrations with medical hardware. I specialize in stabilizing legacy platforms and migrating them to AWS, focusing on reliability, performance, and long-term maintainability.

In my recent work, I developed and evolved modular banking systems in an event-driven architecture (AWS SQS, .NET). I also migrated legacy components to microservices while keeping full backward compatibility, using Copilot/Codex to optimize development workflows and accelerate delivery without sacrificing quality.

When performance and stability matter most, I lead with pragmatic engineering. I optimized memory leaks and responsiveness on a Social Care platform, reducing infrastructure costs by 60% while maintaining 3000 active sessions at peak. I strengthened reliability with Canary Deployments and set up monitoring and alerting via Coralogix, ensuring issues surface early and don’t become production surprises.

I’m equally invested in team growth and modern ways of improving business processes. As a Buddy, SME, and knowledge-transfer lead, I emphasize clean code backed by TDD and code reviews, and I’ve introduced AI capabilities like voice-to-text using LLMs to automate form completion. On the product side, I work across stacks—.NET services, Angular/React front ends, and E2E testing with Playwright and Selenium—so systems perform end to end.