Kalle Jokinen focused on enhancing audit logging and observability for the City-of-Helsinki’s kukkuu and hel-fi-drupal-grants repositories. He migrated audit logs to structured JSON format, introduced request ID tracing middleware, and implemented Elasticsearch-backed log transport with environment-based configuration using Python and Django. For the hel-fi-drupal-grants project, Kalle developed a resilient logger core in PHP, integrating it into the Helfi Audit Log module to manage unsent entries and ensure reliable audit trails. His work improved data integrity, compliance readiness, and scalable observability, demonstrating depth in backend development, logging, and service configuration across both Django and Drupal environments.