• Design and evolve backend and frontend architecture using Node.js and JavaScript. • Apply architectural patterns (microservices, event-driven design) based on real constraints. • Design systems with failure in mind, using resilience patterns like circuit breakers and rate limiting. • Build, ship, and maintain backend services and web interfaces in production. • Deliver new features end to end — from requirements to release. • Optimize applications for performance, scalability, and reliability. • Ensure high code quality through reviews, testing, and clean architecture. • Write and maintain unit, integration, and end-to-end tests. • Improve test coverage and reliability of existing systems. • Identify performance bottlenecks and drive optimization initiatives. • Ensure secure coding practices and basic application security. • Partner with product managers, designers, and engineers to deliver business outcomes. • Translate requirements into technical solutions with clear trade-offs. • Contribute to planning, estimation, and iterative delivery in Agile environments. • Share technical context and documentation with the team. • Mentor junior engineers and support technical growth within the team. • Participate in technical discussions and continuous improvement initiatives. • Stay current with modern JavaScript, Node.js, and web development practices.