GroupMe / AI product engineering / 2025 - 2026
Streaming chat summaries.
Incremental responses, caching and failure handling in the iOS client.
The problem
Summary text arrives in parts. The client needed to display it as it arrived, handle interrupted or failed requests, and avoid showing a cached response that no longer matched the conversation.
My contribution
- Owned iOS streaming for Copilot-powered chat summaries across incremental rendering, state, caching, failure handling and telemetry.
- Built automated tests around summary state and event behavior.
- Coordinated event handling and client behavior with backend and Android engineers.
Technical decisions
Explicit loading states
Handled loading, partial content, completion and failure separately, with tests around the state changes.
Cache freshness
Bounded cache size and checked whether a stored summary still matched the current conversation context before reusing it.
Separate timing events
Instrumented the arrival of the first content separately from completion, so the two stages could be measured independently.
The result
The summary UI displayed text as it arrived instead of waiting for the complete response.
My contribution was the iOS implementation, including state, caching, UI, error handling and tests.