During December 2024, Markus Kieselmann focused on backend development for the powersync-ja/powersync-service repository, addressing a reliability gap by exposing probe endpoints across API routes for versions 1.0.0 and 1.1.0. He implemented a targeted fix in TypeScript, adding PROBES_ROUTES to the API routing logic to enable consistent health checks and monitoring visibility. This change improved observability and operational stability for production workflows, ensuring that monitoring tools could reliably assess service health. Markus’s work demonstrated attention to traceability and risk mitigation, with clear commit documentation and minimal disruption to existing features, reflecting a methodical approach to backend service maintenance.