Strong background in backend development with PHP and MySQL, applying DDD principles. Previous experience with React and TypeScript. Deep understanding of API design (RESTful, GraphQL) and web application layer protocols. Understanding and application of best practices in CDN usage, cloud storage, caching, and scalable architecture. Experience in contract and interface definition. Skilled in writing unit and integration tests, with a solid grasp of error handling, logging, and observability. Familiar with testing frameworks and component composition best practices.