• Designed and built the Risk Controls platform from scratch, which became the golden path for freezing and unfreezing seller funds across Square; closed critical regulatory gaps while reducing churn by improving seller and agent experience; migrated >100 codepaths to the platform using Claude Code, cutting months from pre-AI estimates

• Drove platform reliability and performance: reduced main service p99 latency from 500ms to 10ms, and halved infra costs from $12k to $6k/year via single-region migration

• Became domain expert across Risk Controls, Square Card fraud evaluations (3DS and authorisations), and more; ramped up multiple team members through knowledge bases, runbooks, and regular knowledge-share sessions

• Delivered plan for launching Stripe into a new market (identified market requirements, mapped to solutions, split into projects, created timelines & execution plan, onboarded other engineers, derisked and led initial execution)

• Was the first engineer of novel team targeting self-serve UX in specific markets: identified issues in onboarding process, designed solutions and executed, leading to 80% drop in user confusion (selecting "Not sure" in UI)

• Company building: mentor of 2 teammates, during 1 quarter I held more interviews than 97% of engineers at Stripe

• Worked on a web application used to create and display different visualisations of processes and decide how fit they are for automation

• Led projects involving multiple engineers, notably a complete restructuring of the UI/UX for the main process visualisation tool, which led to the company's first successful client engagements

• Helped scale the web application to handle very large amounts of data (e.g by segmenting payloads of HTTP requests, leveraging browser cache etc.)

• Brought on multiple practices for reducing bugs and dev time (e.g unit and e2e testing, using typed languages, following well-known design patterns etc.)

• Mentored multiple colleagues to the extent that the team working on the web application grew from 2 to 8 people

• Made open-source contributions to Vis Network (graph visualisation library)

• Worked on multiple projects, notably created a user authentication and authorisation platform used by 3 different web applications

• Made open-source contributions to Californium (IoT networking library) and CodeceptJS (automated testing library)

• Worked on an award-winning business travel platform, specifically on a web application used by tens of thousands of users to mass book hotels/trains/airplanes

• Devised an algorithm that masks card details from logs, which helped platform achieve PCI compliance

• Was promoted to regular employee after 1.5 months as an intern (worked during university)