● Responsible for building and developing performant web applications, mock website templates, and create new features.

● Leveraged React to architect SPA templates, based on atomic reusable components as a design principle to create scalable, performant front-end applications with a pure javascript library.

● Implemented CSS-in-JS with React components to declare reusable blocks of styling allowing for a more performant application with less files to fetch and promoting explicit and traceable dependencies that reduce collisions and style-leaking.

● Implemented the mobile-first design methodology to build out custom breakpoints and complex layouts as well as integrated UI libraries to allow for rapid prototyping and deployment that remained accessible, responsive for all devices.

● Used Node.js with Express.js library to create lightweight but powerful servers that respond to multiple HTTP requests by serving endpoints with custom middleware as a liaison to server-side logic, data stores (noSQL), and other backend services.

● Employed Jest and React Testing Library for test-driven development heavily using mock functions to separate concerns on testing environments while providing safety guards for production launches by ensuring proper component rendering with no undesired side effects before deployment.

● Implemented Redux middleware to handle asynchronous function calls and managing side effects caused by API calls resulting in application efficiency through non-blocking thread in JavaScript runtime.

● Utilize Reac and Css-in-JS to create flexible components which take dynamic styling as props to render UIs with conditional logic and reusable way.

● Leveraged React Router for dynamic routing with a slug to provide SEO benefits.

● Collaborated with engineers on the design of API infrastructures including defining Categories and Products data models implemented using

RES, AJAX, and JSON for client-server communication.

● Implemented unit testing to ensure the quality of code and facilitate safe refactoring using Jest and Github CI integration pipeline.

● Constructed React SPA by composing modular, reusable components based on the observer pattern to maintain a unidirectional data flow while displaying dynamic views and dispatching actions based on changes to state.

● Established Websocket protocol with a bidirectional client-server communication to improve the application performance for a real-time updated and continuous stream of data pushed by the backend server to the client end.

● Integrated OAuth 2.0 with passport.js to leverage the direct authentication pattern and

strategy for Spotify account authorization resulting in secure authenticated sessions managed

by a third-party platform for a seamless user experience.