▸ Migrated frontend from Create React App to Vite, cutting application load time by 40% — directly improving user retention metrics in a production environment. ▸ Built and shipped production-grade RESTful APIs and backend microservices using Node.js, Express, Prisma ORM, and PostgreSQL, enabling reliable frontend-backend integration at scale. ▸ Developed React.js component library and collaborated with the core team on UI/UX design, maintaining visual consistency across all user-facing surfaces. ▸ Contributed to system design decisions in a 0→1 startup environment — including database schema design, API versioning strategy, and service architecture planning. ▸ Conducted root cause analysis on production incidents, reducing downtime and improving system reliability through cross-functional collaboration with product and design teams.