Worked on enhancing Slack integration APIs by improving type safety and data fidelity across two repositories, slackapi/node-slack-sdk and slackapi/bolt-js. Focused on TypeScript-based event handling and type definitions, the work included expanding the AppMentionEvent files property typing, adding huddle_state_call_id to UserHuddleChangedEvent, and introducing an enterprise field to MemberJoinedChannelEvent. In bolt-js, enabled threaded messaging by adding thread_ts to the RespondFn type, supporting richer user interactions. These targeted features increased reliability and observability for Slack apps, with a technical approach centered on precise API development and robust type modeling to support enterprise-grade integrations and maintainability.