Front-End Developer Senior

JOHN WINKER COOK

Senior Front-End Developer React Next.js JavaScript TypeScript UI/UX Expert **********.***@*****.*** +1-619-***-**** San Diego, CA https://www.linkedin.com/in/john-cook-243855354/ SUMMARY

Results-driven Senior Front-End Developer with 8+ years of experience building dynamic, high-performance web applications. Proficient in modern front-end technologies, frameworks, and development best practices. Successfully led teams, implemented scalable solutions, and delivered high-impact features that boosted user satisfaction by up to 40%. Highly experienced in creating intuitive, responsive, and accessible user interfaces while collaborating closely with designers, backend engineers, QA engineers, and stakeholders. Passionate about innovation, continuous learning, and driving product excellence. Skills & Tech Stack

• Languages: HTML5, CSS3, JavaScript (ES6+), TypeScript

• Frameworks & Libraries: React.js, Next.js, Vue.js, Angular, Redux, Zustand, Recoil, Three.js

• Styling: Tailwind CSS, Chakra UI, Material UI, SASS, Less, PostCSS

• API & Backend Integration: REST APIs, GraphQL (Apollo Client, Relay), gRPC, WebSockets, JWT, OAuth

• Tooling & Build Tools: Webpack, Vite, Parcel, Babel, ESLint, Prettier

• Testing & Debugging: Jest, React Testing Library, Cypress, Playwright, Vitest, Chrome DevTools

• Version Control & CI/CD: Git, GitHub, GitLab, Bitbucket, GitHub Actions, Jenkins, CircleCI

• Deployment & Hosting: Vercel, Netlify, AWS Amplify, Azure, Docker, Kubernetes

• Performance & Monitoring: Lighthouse, Sentry, LogRocket, Google Analytics, Amplitude, New Relic

• Architecture & Patterns: Component-Driven Development, Design Patterns, Monorepos, Micro Frontends, Atomic Design

EXPERIENCE

Senior Front-End Developer 03/2019 to 02/2025

Aptive Environmental

- Led a team of five senior front-end developers to build and maintain enterprise-level web applications, resulting in a 30% increase in customer satisfaction.

- Built scalable front-end architecture with React and Next.js, handling millions of users.

- Implemented complex UI features, including dynamic forms, data visualizations, and real-time updates using WebSockets and Apollo GraphQL.

- Developed reusable components using React Storybook to streamline development and ensure design consistency.

- Optimized front-end performance, reducing load times by 25% through lazy loading, code splitting, and Lighthouse audits.

- Conducted unit and end-to-end testing with Jest, Cypress, and Playwright to maintain 98%+ test coverage.

- Collaborated with DevOps to set up CI/CD pipelines via GitHub Actions and automate deployments to Azure and AWS.

- Mentored junior developers, conducted regular code reviews, and championed best practices in accessibility and responsive design.

- Interviewed and hired new engineers

- Developed onboarding processes to facilitate bring on new hires Front-End Developer 06/2017 to 03/2019

Clayton Homes Inc

- Built and maintained a high-traffic online platform using React, Redux, and TypeScript, enabling thousands of daily transactions.

- Integrated third-party services and APIs, including Stripe for payments and Firebase for real-time data syncing.

- Refactored legacy code to modern React patterns, reducing technical debt and improving app stability.

- Introduced React Testing Library and Cypress for testing, leading to a 20% decrease in production bugs.

- Implemented i18n and localization features, enabling the platform to expand into international markets.

- Developed responsive e-commerce sites using React, Node.js, and MongoDB, decreasing load times by 35%.

- Built a payment system integrated with PayPal and Stripe, handling secure transactions and reducing errors by 40%.

- Worked closely with UX/UI teams to implement designs and conducted A/B tests to improve user engagement.

- Introduced performance optimizations, including memorization and virtualized lists, resulting in a 30% increase in app speed. EDUCATION

Bachelor’s degree in computer science 07/2015

National University San Diego, CA

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