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deen john

@deenjohn

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I build high-traffic React platforms with faster performance and scalable frontend architecture.

India

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I'm currently building faster e-commerce experiences at Sephora, improving SEO, caching, rendering, and Core Web Vitals with Next.js. I also integrate GraphQL APIs and product-search chatbot capabilities.

At Yieldmo, I modernized four legacy applications into an Nx monorepo with a shared Material UI library, cutting code duplication by 40% and accelerating feature delivery by 25%. I also architected a Next.js micro-frontend platform using SSR/ISR.

At Tokopedia, I owned frontend architecture for a high-traffic marketplace, improved Core Web Vitals by 30%, and led a 10-member frontend team. My work included subscription flows, search and PDP modules, API integration, Akamai caching, and an A/B testing framework that increased conversion by 5%.

Across Art Basel, Philips-Medisize, Derivco, freelance projects, and Mphasis, I've built React, Angular, and Node.js applications, mentored engineers, and delivered reliable releases for customer-facing products.

Experience

Work history, roles, and key accomplishments

Current

Fullstack Frontend Developer

Current

Sephora

Jul 2025 - Present (1 year 2 months)

Optimized SEO and leveraged Next.js for advanced caching and rendering, enhancing Core Web Vitals and application speed. Collaborated with design teams using Figma and Material UI to build responsive components, and integrated Apollo GraphQL API and a RAG-based chatbot.

React Next.js SEO Core Web Vitals Figma Material UI Apollo GraphQL RAG Chatbot

Senior Frontend Developer

Yieldmo

Aug 2022 - Jun 2025 (2 years 10 months)

Modernized legacy applications into a Nx monorepo with a shared UI library and migrated REST APIs to GraphQL, reducing code duplication and accelerating feature delivery. Architected a scalable Next.js micro-frontend platform on Vercel and mentored engineers.

Nx (Monorepo)Material UI GraphQL Next.js Vercel SSR ISR CI CD Code Review Mentorship

Team Lead-Frontend

Tokopedia

Jan 2021 - Jul 2022 (1 year 6 months)

Owned frontend architecture for a high-traffic marketplace, improving Core Web Vitals and leading a 10-member team. Implemented CI/CD, containerized services, and led architecture during the Tokopedia–Gojek merger, including subscription flows and A/B testing.

React Core Web Vitals CI CD Docker Kubernetes A B Testing Architecture Mentorship Akamai

Senior Software Engineer

Digital Management, Inc

Dec 2019 - Dec 2020 (1 year)

Developed React apps with multi-event calendars, exhibitor apps, viewing rooms, and reusable modules, including i18n and deep linking. Mentored 3 engineers in React/ES6, boosting team velocity.

React i18n Deep Linking Dynamic Filtering Mentorship

Senior Software Engineer

Zensar Technologies

Apr 2018 - Dec 2019 (1 year 8 months)

Delivered mobile and desktop gaming experiences using React, Redux, JavaScript, and Angular, and modernized legacy codebases. Led a 4-member team, mentoring engineers and collaborating with designers, product, QA, and customers.

React Redux JavaScript Angular Mentorship Code Quality

Freelance Developer

Freelance

Sep 2015 - Mar 2018 (2 years 6 months)

Worked on freelance projects using Angular, React.js, Node, and other technologies, integrating payment gateways and developing microservices. Achieved a 50% increase in online transaction rates through RazorPay and PayPal integration.

Angular React Node JavaScript ES6 ExpressJS MongoDB Webpack Razorpay PayPal Microservices MySQL

Software Engineer

Mphasis

Jul 2011 - Aug 2015 (4 years 1 month)

Wrote test cases for legitimate testing environments, worked closely with customers to resolve issues, and collaborated with peers to develop high availability solutions for mission-critical applications.

Testing Customer Support High Availability