Hi, I'm Felix 👋

Software engineer working across systems programming and backend/infra tooling. I like working in complex systems and making the kind of change that meaningfully simplifies them and makes them more resilient — not just adds another layer. I trust stats and numbers over gut feeling, and I'd rather spend time finding and fixing the root cause of a problem than patch the symptom and move on.

What I work with

Professional

• Languages: TypeScript, Go, Kotlin
• Actively used (last years): SpringBoot, Express/Hono, AWS + CDK + CloudFormation, Prometheus, Grafana, SOAP, OTEL, CodePipeline, GitHub Actions
• Experience with, less recently: Kubernetes, Keycloak, Angular, Svelte, Ansible, Concourse, Python

Private

• Languages: Rust primarily, also experimented with Haskell, C, Java
• Currently: agents and agent sandboxing
• Historically: light embedded work, self-hosting, coding puzzles (Advent of Code, LeetCode)

Highlight projects

Period	Product	Team	Role	Highlights
2016–2020	B.Sc. Information Engineering, dual study program (Studium im Praxisverbund)	Security team/CERT, then IDP team	Working student / thesis student	Dual study program alternating academic terms with business integration phases Several optional additional courses in software engineering Business integration phases primarily with the internal security team/CERT Changed to the IDP team; wrote thesis there on a graph of people trusted to know each other, usable as a source of affirmation for other people's actions as a form of multi-factor authentication
2019–2021	Groupwide IDP for internal users	IDP team	Core developer	Keycloak-based identity provider Go based customer self-service Deployed with Ansible + Kubernetes across private OpenStack and AWS for hot standby
2022–2024	product for car workshops globally as legacy replacement	feature team	software engineer	High business-complexity, high-importance components Migrated from internal app-hosting platform to AWS Simplified logic and remedied technical debt while improving availability and performance
Jun 2024–Dec 2024	product for car workshops globally as legacy replacement	feature team	Senior sofware engineer	Optimized import process for building a current view of data from delta update packages sent by a legacy editorial system Made the view performant and the import process fast and resilient
2025–2026	product for car workshops globally as legacy replacement	Platform Team	Senior software engineer	Standardized AWS CodePipeline abstraction (declarative config, transparent caching) Centralized monitoring and alerting Established operations best practices and post-mortems Early adopter of agentic coding; multiplied it across the org via a shared default opencode setup Worked on making internal business and technical knowledge available to agents Shared learnings and tips for working with agents

Currently exploring

• Sandboxing and safety boundaries for autonomous coding agents

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Commit activity (private + professional history merged, generated with a self-built Rust/DuckDB CLI)