Uber’s Fulfillment platform: It powers real-time global scale shopping and logistics systems. I as a tech lead in the Finalization domain led the team to deliver many cross-org and intra-org initiatives to deliver a new Finalization stack and modernize the existing core endpoint stack for Fulfillment. Projects included delivering a newer Finalization stack with onboarding Rides, and 3rd party supply (UK taxis - Autocab, NYC taxis - CMT) onto it with different pricing strategies ex. Uber setting a price or 3p setting its price. Built it as a generic Finalization stack to enable Eats onboarding. This layer enables long-term persistence, and money movement for both Rides and Eats. Team size: 9 people. Some of the other projects in the Fulfillment domain include: 1) Redesigning core trip endpoints by establishing a newer Fulfillment layering architecture 2) Failed orders payout resolution 3) Cross-selling primitive in Fulfillment 4) Critical path analysis of the Fulfillment endpoints; Published paper (https://drive.google.com/file/d/1d0AAsKP7ROUeXtPc-5OlyHgiDp3I6rOW/view?usp=sharing) in USENIX ATC (https://www.usenix.org/conference/atc22/presentation/zhang-zhizhou); Received Uber developer platform technology award.

Marketplace Edge Gateway platform: It exposes any API to the world for all teams at Uber. I as a tech lead of the Edge gateway platform led the delivery of the platform overall in production. It serves currently 1600 APIs. To enable this scale, iteratively delivered on many other platform features across themes of Developer experience, Scalability, Reliability like backward compatible mobile interfaces, build optimization, unified testing strategy, onboarding external partners API, codeless push message onboarding, security pipeline, meltdown prevention, and building internal stack’s edge community. Uber eng blog post [1] [2] featured on ycombinator news front page. Financial platform: Built leading a team of 4 solving for accurate streaming aggregations of events (3x Uber's trip scale). Real-time P&L platform powers slice and dice of economic metrics across various dimensions.

InMobi Book keeping system: Architected, built leading a team of 4; capable of handling peak QPS of 2500. Channel Ad Server : Single handedly Re-Architected along with performance optimization in 3 months which increased request handling capacity from 300 million to over 2 billion daily.

Smartpay Redesigned platform by breaking a monolith single service into 5 different services like online transaction system, post processing, and subscription renewal systems handling 10 million transaction daily. Full rewrite of over 1 lac line of code was done in 4 months, with 30 % code written by me. Performance improved by 350%.

Evolution: Open source email, calendar and address book in one application. Implemented advance search and show options capability for Task/Memo/Calendar Management. My name got listed in a GNOME Evolution product credit list.