Petar Todorov focused on backend development for the kyma-project/application-connector-manager, where he addressed a critical issue in the Compass Runtime GraphQL integration. He identified and resolved a syntax error in a GraphQL query by removing unnecessary parentheses from the configuration field, which restored reliable configuration retrieval from the GraphQL endpoint. Working primarily with Go and GraphQL, Petar ensured that the fix improved runtime stability without disrupting existing workflows. His work was reviewed and merged with minimal impact on the broader system, demonstrating a careful and targeted approach to maintaining backend reliability during the month-long engagement on the project.