I work primarily with the core services group which handles creation of / access to Users, Tweets, Relationships, and URLs.
My first year was spent working on the User Service and my capstone project was migration of the user creation flow out of the legacy codebase into our service for increased reliability and decreased maintenance costs. After this I moved to Tech Lead the Social Graph Service where I spent time dealing with both technical and organizational challenges. During my time leading SGS we launched several new user-facing features as well as making major improvements in our service architecture and culture around testing.
I recently transitioned SGS to the next Tech Lead and am currently helping cover User Services while they ramp up new team members and fill open reqs.