Proven commercial experience working with React and Node. Experienced in JavaScript, including asynchronous programming, closures, and ES6. Experience with GraphQL. Experience in distributed version control systems (e.g., Git). Experience in databases (both relational and schema-less). Strong focus on continuous integration and delivery. Focus on test-driven development (TDD). Building high-performance and scalable applications. Good understanding of RESTful web services. Familiarity with performance monitoring tools. Ability to debug production issues calmly.