John Deegan Email & Phone Number

- Worked with Walmart e-commerce team, provided robust, scalable front end solutions for 4M+ Walmart customers using React, TypeScript, Next.js, GraphQL, Docker and AWS.- Developed a smart store management web application that enables 10K+ Walmart store builders to easily build and manage their smart stores using React, Next.js and Node.js micro services.- Developed a new AI based product recommendation engine using React, GraphQL, Redis, PostgreSQL and Go, collaborating closely with cross-functional teams in fast paced Agile environment.- Migrated a faster and easier new checkout process using React, Redux Toolkit and Django, reducing the average checkout time by 50% and increasing the completion ratio by 10%.- Converted wireframes and mockups into pixel perfect, responsive UI using React, TypeScript and Tailwind CSS, achieving a 95% positive user feedback rate.- Developed individual micro services using Node.js, Python and Go, focusing on scalability and high performance while adhering to best practices of modern architecture.- Integrated automated testing suites utilizing Jest and Playwright with 80% of coverage.- Bridged communication gaps through cross-functional teams and mentored junior and mid-level engineers to grow technically and personally.

- Developed the easy-to-use front-end user interface for the self-driving car on Apple Autonomous team using React, TypeScript, GraphQL and C#.- Built the UI of Apple admin self-driving car monitoring application using React, TypeScript and Material UI.- Leveraged WebSocket and D3.js to intuitively visualize 2D/3D real-time data from the self-driving car's sensors.- Created a reusable front-end library with React, TypeScript and Material UI, streamlining UI across multiple projects and decreasing development time by 30%.- Employed lazy-loading and code-splitting techniques using Next.js, slashing average page load times and achieving a 95+ Lighthouse score.- Collaborated with backend engineers for optimized GraphQL API integrations and DevOps engineers for successful release of the application.- Played a key role in Agile development cycles, fostering effective cross-team communication and ensuring project delivery on time and above quality standards.

- Participated in the development of a React/Python 3 based server application that automated silicon test execution, increasing testing efficiency by 35% and reducing manual errors by 20%.- Crafted intuitive and responsive dashboards using React, enabling real-time visualization of silicon chip states, crucial for debugging hardware failures.- Designed and implemented high-performance REST APIs, enhancing data interchange between frontend and backend systems and improving API response time.- Administered and optimized PostgreSQL, MySQL and MongoDB databases, achieving a 20% improvement in query performance and ensuring robust data integrity.- Incorporated Test Driven Development (TDD) methodologies, contributing to reduction in software regressions and speeding up the QA cycle.