Authentication Platform team, Security

• Established the Authentication Platform team from 1 to ~7 engineers with focus on maintaining, improving, and revamping Robinhood’s authentication framework and infrastructure.

• Led the team to ship WebAuthn (Passkeys) for Robinhood, which provided customers safe and fast access to their accounts with a delightful experience. This also made Robinhood the first Fintech company which adopts this security feature.

• Led the team to reduce ~50% of AWS cost (millions) for running the authentication services.

Trust and Safety team, Security

• Migrated the authentication service (high throughput, millions QPS at peak) from EC2 to kubernetes without causing downtime.

• Designed the entire backend architecture and APIs for Robinhood’s Device Approvals.

Auth Infra team (former Services Infrastructure team), Trust Membership

• Tech-leading Airbnb’s authentication infrastructure team, rebuilt the architecture from scratch, which included designing, implementing, maintaining, and improving the user authentication backend, signup/login backend, OAuth platform, and GDPR workflow.

• Providing mentorship on all other authentication related components, which include session management/tracking, OAuth presentation service, and cache invalidation pipeline.

• Designed, implemented, and rolled out a JWT-like but strongly typed internal authentication token which is cryptographically-protected and used to deprecate the plain text user id from authentication path.

• Secured Airbnb's APIs by defaulting all APIs to use a require_log_in filter, this also contributed to the company's anti-scraping initiative.

Search System Team

• Build the search engine for http://www.walmart.com/, using Solr as backbone and add some business logic on top of it. Modify Solr core when needed. Strive for making the search system fast, robust, and scalable.

• Involved in various distributed system related projects, including Liveupdate (internal configuration management mechanism), Nead Real-time Indexing, distributed rate limiting, etc.

• Work on Solr(an open source search engine) and Couchbase(an open source NoSQL database) plugin, which makes Solr to be able to implicitly index any document updates or changes that happen on Couchbase side, achieving real-time/near real-time search engine indexing. This project is also contributed to open source: https://github.com/LucidWorks/solr-couchbase-plugin/