Worked on Facebook Stories Camera Experience for Android

Improved video discoverability by showing suggested Live videos, using the Litho

Improved fullscreen watch time by 0.5% by implementing a fullscreen button

Developed feature to tag and invite friends in comments

Decreased client data usage by 0.6% by allowing users to mute comments via a button

Redesigned comment composer as part of app-wide redesign

Implemented live graphs to show measurements in real-time, and provide greater insight into trends

Exposed the root cause of device latency by adding events to Android Systrace

Created accelerometer latency measurement in Arduino C++ for VR devices

Introduced automated testing by starting a JUnit test suite, with Mockito

Automated uploading of measurement data by developing a Python server

Reduced Messenger background data usage by 1-2% overall by using Invertible Bloom Filters for set reconciliation. Previously, to reconcile the client's data with the server, the server would send down the entire dataset. With this change, the client sends up a bloom filter of the hashes of the objects it has, and the server probabilistically decodes this and sends down the missing/changed objects.

Optimized state logic and throttling to reduce round-trip requests

Benchmarked and investigated Zstandard dictionary compression for the library and wrote a script to train zstd dictionaries from production data

Investigated the internals of Flatbuffers vs Thrift to debug why Flatbuffers were larger for the same schema

Prevented leaks of internal URLs in open-source documentation by transforming URLs in the document generator

Added logging to track library data usage

Optimized Cassandra queries, and applied distributed systems concepts

Increased production data archival speed by 10x by implementing concurrency

Improved SLA metric accuracy and reduced transient alerts