I worked at the System Software Team. Here are some highlights:

• On-robot Full Disk Encryption (FDE, LUKS, TPM, clevis, LVM, Linux): canaried in the robot fleet, analyzed performance metrics (with dashboards), evaluated and reviewed performance impact with cross-team stakeholders, and eventually rolled out with minimal downtime, hardening robot security and protecting intellectual property and privacy.

• Simplified and unified RobotConfig (GCL, protobuf, bazel, C++), a schema and system to store params and calibration data for various IPC modules, making it more flexible and manageable.

• End-to-end development of PowerManagementModule from scratch (C++) to enable scheduled shutdowns on robots, reducing power consumption and disk corruptions.

• On-robot Wifi/Network (Linux, Android, SELinux): improved network availability (supporting IPv6), stability and security (firewall), increasing operation uptime.

• Rapid prototyping/experimentation on Wifi RTT localization using IEEE 802.11mc protocol (Android, C++), unlocking new possibilities to help with localizing in ambiguous environment.

• OS update rollout Automation (Android, OTA, Python): worked on A/B booting, Android update on next boot, auto reboot after OS update etc, significantly reducing the manual effort and time.

I worked on Google Maps Data Quality. Here are some highlights:

• Full stack development on scalable and efficient internal map editor used by thousands of operators: Java Swing OpenGL frontend and Java gRPC microservices as backends. Critical for map update and moderation.

• Street view enhancement on the internal map editor (Java, OpenGL): integrated new image sources, implemented and improved the renderers, increasing operator productivity with faster loading and display.

• Road geometry for hyper-detail maps (Java, C++): designed and implemented data schema, generation algorithms/workflows, editing tools, distributed batch data processing pipelines (Flume/Map Reduce), and map tile rendering. One of the key features of the new Japan Maps.

• End-to-end backend development from scratch on a Java gRPC microservice: designed and developed the APIs and config specs, enabling sophisticated QC sampling for our map edits. Estimated to save millions of dollars on operations.

• Multiple dependency migrations of high complexity and scope: coordinated with teams, refined requirements, strategized migration plan, and smoothly landed with zero downtime.

• Amazon Mobile Shopping App for iOS (Objective-C)

• Xcode Build System (Ruby on Rails), which builds, signs, packages, and publishes most of Amazon iOS apps

• App Review Monitor (Python), which collects, translates, and store our app rating and review on AppStore, generates daily email digest, and produces charts that help product manager gauge user feedback

• Helped launch Prime Now app for iPhone, Amazon's one-hour delivery service