• Built a fully-automated credit underwriting engine: leveraged multiple ML models and built a future-proof framework to make nuanced credit decisions at Stripe’s scale. $16 M+ incremental profit in a 5-month A/B test

• Redesigned the risk reserve money-movement rails & shipped the "reserves for platforms" API: rewrote the reserves system that moves billions of dollars annually, scaling to >1 K RPS and hundreds of thousands of writes per day. Productized the internal reserve system into a public API for platforms

• Automated the highest-volume manual credit review: cut vendor handling time by 50 %, drove 3× faster completions, and enabled rapid workflow iterations by replacing 80 % of a 20-page process with code

• Extended the underwriting platform to fraud decisioning: worked across teams to expand the credit decisioning framework to fraud, built foundational tools and pushed the project across the finish line

• Led delivery of a cross-org credit-risk backtesting framework: replaced legacy tooling, eliminated many data-integrity bugs, and provided out-of-the-box backtesting support for our future risk policies

• Team leadership & operational excellence: onboarded/mentored 4 + engineers, ran 20+ interviews, facilitated multi-team working groups, and built dashboards & go-live checklists to improve our reliability posture

Reported directly to CTO, Implemented multiple architecture and tech changes:

• Clean Architecture + GraphQL (whole codebase)

• Typescript (whole codebase)

• CI/CD: testing strategy: unit/integration/e2e tests

• Accelerated transition from Angular to React

• Drove transition to newer bundlers: Snowpack, Vitejs

• Supporting transition to Tailwind + Design System

Built foundational features & design practices that enabled rapid iterations & more complex features to be built on top:

• Search / filtering framework: built complex lists with filtering, sorting, full text search & csv export

• Activity Feed: tracked changes in the system and allowed clients, ops & support teams to communicate via messages ('@' mentions, email responses and delivery status)

• Report builder: config-defined reporting with plan to allow users to build their own reports & dashboards

Backend development (1y)

• Development of a GraphQL API gateway with NodeJS

• Development of a distributed CCTV system: migration from C++ application to Golang micro-services (+ unit tests)

Frontend development (2y)

• Migration of an existing AngularJS codebase to ReactJS (FlowType, Redux, Redux-Sagas, tests)

• Migration of a medium-sized AngularJS codebase to newer toolchain (Webpack, ES6 imports)

• Development of a web-based 3D building viewer with real-time rendering of heat maps

• Development of a CCTV web-application in AngularJS (+unit tests)