5+ years of professional development with Node.js & TypeScript. Strong understanding of asynchronous patterns (Promises, streams, RxJS preferred). Experience with messaging systems (Kafka, RabbitMQ) and distributed systems. Solid work with RDBMS (MySQL/PostgreSQL), NoSQL (DynamoDB/MongoDB/Redis), and columnar/analytics DBs (ClickHouse/Redshift). Proven delivery of production-ready solutions, including testing (unit/e2e), observability, and performance tuning. Hands-on with Kubernetes and containerization (Docker). Good grasp of system design, API design, and network protocols. Commercial experience with React (and Redux or modern alternatives). Comfortable with HTML/CSS/SCSS (BEM/SMACSS or similar methodologies). Ability to translate product requirements into usable, accessible UIs. Degree in Computer Science or related field (or equivalent experience). Excellent knowledge of CS fundamentals, database theory, and code-testing practices. Experience building and reviewing clean, testable, performant code across the stack.