Ruby on Rails engineer with nearly four years of production experience across founder, startup, and consultancy settings. Recent work includes resumable, idempotent backend workflows and LLM evaluation pipelines. English native, German C2.
Designed and built a production Ruby on Rails foreign-language reading platform with adaptive per-user rendering, durable vocabulary/progress state, and a multi-pass language-processing pipeline.
Engineered resumable workflows using transactional checkpoints, row locking, idempotency, and operator repair tooling to survive restarts and provider failures.
Built a deterministic LLM evaluation harness using adversarial fixtures, repeat-run variance testing, and quality/cost/latency criteria to select production models.
Developed and maintained features across a complex Ruby on Rails B2B platform supporting commerce between a major telecommunications company and German public-sector customers
Worked across backend, database, and frontend layers, implementing business logic and user-facing functionality in a large, established production codebase
Collaborated in a German-speaking agile team to clarify requirements and deliver features in a complex business domain
Built interactive frontend functionality with Hotwire and Stimulus.js