Prerak Mathur
Developer + Full-Stack Engineer, Frontend Developer, Backend Engineer, Open Source Contributor, and Problem Solver
Hi there
I'm Prerak, a Full-Stack Engineer at Walmart Global Tech with 2+ years building production systems end-to-end. I work across the stack — React, TypeScript, and Next.js on the frontend; Java, Spring Boot, Kafka, and GCP on the backend. I care deeply about component architecture, system design, and performance.
Outside of work I maintain Tokis, an open-source React UI library with 500+ weekly downloads, and contribute to projects like Internet Archive and CircuitVerse. I'm also a Codeforces Specialist and Google Summer of Code 2022 contributor. Always happy to chat about full-stack engineering, open source, or distributed systems!
Send me a message
Where I've worked
- Built an internal analytics dashboard (React, TypeScript, GraphQL) with Redux state management and lazy-loaded modules — reducing on-call reliance by 40% and cutting initial bundle load time by ~35%.
- Designed reusable React component library and data-fetching patterns adopted across internal tooling, enforcing consistent UI contracts and accelerating feature delivery.
- Automated data re-ingestion and audit workflows on GCP via Java and Kafka, eliminating 10–12 DevOps hrs/week and reducing manual operations by 75%.
- Contributed to Walmart’s catalog aggregation backend — reactive Kafka + Cassandra services with 35% peak surge reduction monitored via Grafana.
- Built a returns lifecycle tracking dashboard (React, GraphQL, Axios) with real-time order status UI and Redux state management, cutting ticket resolution time by ~30%.
- Built dependency management tooling and secure CI/CD identity key generation for Walmart’s internal platform, improving access governance and security.
- Architected a Java Spring Boot gateway filter enforcing authorization policies for sensitive internal APIs, preventing unauthorized downstream access.
- Developed SEO-optimized web apps and admin dashboard with Next.js SSR, building responsive, accessible UI components and improving Core Web Vitals across devices.
- CGPA: 8.6 / 10
What I work with
Frontend
- React
- TypeScript
- Next.js
- JavaScript
- HTML / CSS
- Redux
- GraphQL
- Tailwind CSS
- Vite
- Webpack
- Jest
- Storybook
- Axios
- CSS Custom Properties
Backend & Infra
- Node.js
- Java
- Spring Boot
- Apache Kafka
- PostgreSQL
- Redis
- Cassandra
- Docker
- Kubernetes
- GCP
- AWS
- Git
Concepts
- Component Architecture
- SSR / SSG
- Performance Optimization
- Accessibility (WCAG)
- WAI-ARIA
- Core Web Vitals
- Micro-frontends
- System Design
- Event-Driven Architecture
- Observability
- CI / CD
Tokis – Open Source React Component Library
Built and published a zero-runtime, token-based React UI library on npm with 500+ weekly downloads — accessible WAI-ARIA components, CSS custom properties theming, and a tree-shakeable bundle.
Self-Hosted Cloud Streaming & Storage
Deployed a containerized streaming platform using Docker with encrypted remote access via Cloudflare Tunnels — implementing a zero-trust architecture with no exposed network ports.
Drone Development & Data Classification
Led a government-funded project for India's Ministry of Science and Technology, developing an open-source drone platform for agricultural ML data analysis. Patent Pending.