Juha-Matti Rajala worked on the City-of-Helsinki/tilavarauspalvelu-core repository, focusing on improving the reliability of error tracking and debugging workflows. He addressed a critical issue in the Sentry source maps upload process by aligning release names between the UI and Admin UI, ensuring that error events are accurately attributed. This was achieved by prefixing release names with service identifiers, which eliminated misattribution and streamlined incident triage. Juha-Matti applied his expertise in CI/CD and DevOps, utilizing YAML to implement the fix. The work demonstrated a targeted approach to resolving a nuanced problem in production monitoring and deployment pipelines.