• Tech lead for the 8-person team handling card issuance, auth and clearing, and digital wallets.• Led the team's work to make Brex a first-party card issuer and processor connected directly to Mastercard, eliminating reliability costs and financial costs of third-party intermediaries.• Represented the team in a company-wide design discussion to create a credit card that has a dynamic billing currency–groundbreaking work. Designed the team’s part of the system in detail.• Led a team of engineers to build a framework that allows other teams to independently add logic to the card authorization flow without risk of breaking authorizations.

• Designed and built native iOS and Android apps backed by a serverless AWS stack.• Integrated the apps with open source libraries and service providers’ APIs.• Managed a team of five developers to accelerate feature development while maintaining code quality.

• Owner of a distributed system that allowed trading engines to recover when network packets from the stock exchanges were dropped. Increased network-wide throughput of the recovery system by 33%.• Wrote code to handle different stock exchanges’ wire protocols.

• Owner of the Windows kernel’s timer system and its I/O manager.• Delivered a minifilter to support fair rather than FIFO disk I/O scheduling in Windows 10.• Created new classes of timers to support high-precision timeouts and to improve energy efficiency.• Previously the owner of the boot graphics library, which renders images before the primary graphics stack is in place and while the system is performing a controlled crash.

Prototyped improvements to the user-managed scheduling system that allows clients such as SQL Server to schedule their own threads.

Increased the productivity of the TvAds team by creating a tool that allowed developers to view the TvAds user interface’s performance statistics and know where they should improve performance.