Senior individual contributor on a 14-developer B2B product team; temporarily led a subgroup and supported engineers through code reviews, pair programming and technical troubleshooting. Built and maintained production web applications and backend services across Node.js/TypeScript, Python and Java microservices, deployed with Docker on AWS. Designed and shipped solo an AI-powered document-processing pipeline for handwritten text recognition, owning it from prototype through two production architectures. Implemented a cross-platform payment module integrated across web and mobile via SSO, processing thousands of dollars daily for tens of thousands of users. Designed and optimized the PostgreSQL queries backing real-time user ledgers for approximately 60,000 daily transactions. Set up and maintained CI/CD pipelines on AWS, working daily with product managers and QA.

Designed and deployed solo a serverless Next.js and MongoDB platform on Vercel, replacing a manual paper process with one-click registration for approximately 300 people. Built the notification path as an asynchronous serverless pipeline.

Designed solo a Redis StreamAdapter and native WebSockets architecture for distributed ticket management, reaching sub-100ms latency across server nodes in a high-throughput environment. Migrated an entire JavaScript codebase to TypeScript, introducing Cypress end-to-end tests first. Reduced production error volume from 6-7 incidents per day to 0-1 per day. Led solo a redesign of location and route-tracking logic that cut Google Maps and GCP API costs by approximately 40%. Led frontend integration of live streaming features in React.

Delivered frontend-heavy React features backed by Node.js/Express and PostgreSQL. Mentored a junior developer who went on to independently ship a feature adopted across the core project; taught React, Node.js, Nest.js, PHP and SQL to junior developers.