Led the engineering team building Direct.One from the ground up. Owned the full stack — from a Next.js front end and a Node.js service layer to the PostgreSQL data model and AWS infrastructure. Shipped a real-time messaging pipeline handling millions of events a day, cut p95 latency by 60% through caching and query tuning, and mentored four engineers while setting the team's code-review and CI standards. Drove the migration to a modular service architecture that let the team ship features independently and safely.