Over a two-month period, contributed backend and API development expertise to the neynarxyz/OAS and Effect-TS/effect repositories. Delivered a Notification Tokens API for neynarxyz/OAS, defining a clear OpenAPI Specification in YAML and TypeScript to support integration workflows and token lifecycle management. Enhanced API governance by updating versioning and ensuring traceability for auditability. In Effect-TS/effect, improved HttpServerResponse by refining redirect semantics and introducing explicit cookie expiration, focusing on correctness and developer experience. All work emphasized robust API design, client compatibility, and maintainability, leveraging Node.js and TypeScript to deliver features without introducing or resolving major bugs during the period.