User Interface (UI) Software Developer III

User Interface (UI) Software Developer IIIPrinceton, New Jersey 08540Pay Rate: $55/hr on w2 all inclusiveClient: Educational Testing ServiceRequired:• Must be able to obtain Public Trust clearance• Strong/Expert level proficiency in JavaScript/TypeScript, HTML5, CSS with knowledge of internals with minimum of 5 years of experience developing world class user interfaces.• Strong understanding of ReactJS and its core principles and at least two years of experience in building applications using React and Angular.• Strong experience in application state management and store design like Redux and Saga.• Understanding of JavaScript Design patterns, transpilers and module bundlers.• Sound knowledge of ECMAScript specification.• Understanding of Object-oriented programming, asynchronous and functional programming.• Understanding of authentication and authorization between multiple systems, servers, and environments.• Robust debugging skills and experience of automated testing platforms and unit tests.• Knowledge of other JavaScript client-side frameworks like Angular, Vue, Chart.js, D3.js a plus.• Strong expertise integrating UI with backend services. Experience in development of, and/or integration with web services and RESTful APIs.• Experience in developing accessible and Section 508 compliant UI interfaces is desired.• Strong analytical skills, problem solving aptitude and good communications skills.• Strong plus: Experience building/deploying server-side applications and APIs with Node.js• Huge plus: Experience in building cross platform desktop apps using ElectronJS.