Lead and scale critical growth initiatives such as onboarding flows, referral systems, guest browsing, notification systems. Design and own end-to-end systems, from backend services to frontend experiences, that impact millions of users. Drive architectural decisions to ensure systems are reliable, scalable, and extensible. Work across product, marketing, and data science to identify high-leverage growth opportunities and rapidly iterate on experiments. Instrument, monitor, and improve funnels to drive measurable lifts in new user conversion and retention. Mentor other engineers and contribute to raising the bar for engineering excellence.