Expertise or strong knowledge in modern front-end technologies (React/Angular/Vue, ES6/Typescript, Redux or similar state management libraries, GraphQL a plus)
Strong experience in various types of testing approaches and code quality tools: TDD/BDD and unit, integration, end-2end and contract testing, linting etc...
Experience with build tools (webpack, yarn/npm, node) and familiarity with Node ecosystem.
Familiarity with CSS Preprocessors (SASS/LESS) and CSS organization methodologies (BEM, OOCSS, SMACSS)