During a two-month period, Sebastian Riesenberg focused on improving reliability and maintainability in Netflix’s dgs-framework and dgs-codegen repositories. He enhanced type resolver validation in dgs-framework by ensuring unregistered type resolvers are detected only after all @DgsRuntimeWiring configurations are applied, using Java and Kotlin to implement the fix and add regression tests for strict mode. In dgs-codegen, he stabilized the build process by removing a deprecated configuration option and its failing test, reducing CI flakiness and simplifying configuration management. His work demonstrated depth in build automation, code generation, and testing, addressing subtle issues that impact developer experience and pipeline stability.