Data structures, Aws Services, Java 8, HTML, CSS, Algorithms, Typescript, Redis, MySQL, Mariadb, Python, Spring Framework, Vaadin, PostgreSQL, MongoDB, Automated unit testing frameworks, Java web development, Web scraping techniques, NoSQL databases

Strong experience of modern JavaScript Web APIs Experience writing JavaScript tests (Jest, etc) Sass / Bootstrap Debugging using JavaScript debuggers JavaScript dependency management and packaging (WebPack) Git Basic understanding of PHP and OOP Experience building UIs for web-based business applications, Cucumber-JS