Optimized a hotpath (messaging) service for performance, durability, and consistency, reducing write latencies by 20%. Investigated and root-caused data inconsistencies, fixed race conditions.

Built infra components to enable privacy features rollout

Improved WhatsApp’s E2E testing infra used by all server engineers

Drove the effort to achieve 100% E2E, as well as unit and integration, testing

Improved app responsiveness in poor network conditions. Optimized multiple image downloads in a collection view by implementing a priority queue to prioritize visible views.

Designed an infinite scroll view and optimized it for performance and user experience.

Profiled the performance of data-persistence utility components used across multiple teams and applications to uncover bottlenecks. Presented my findings at an internal knowledge-sharing session with company-wide iOS engineers.