Rajan Kumar
Open to work8 years experienceSenior Frontend Developer
Senior Frontend Developer | React · React Native · Web3
Standing Rank
Rank Not Available
Developer Badges
Badges Pending
Skills & Technologies
43 skillsGitHub Activity Evidence
GitHub Footprint Not Connected
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Work Experience
Senior React Native Developer
YP Club
- Owned end-to-end development of a production React Native membership app (iOS & Android) from architecture decisions to App Store/Play Store releases.
- Designed scalable mobile architecture with React Navigation, modular screens, shared component libraries, TanStack Query, Zustand, and MMKV for offline-friendly data.
- Built wallet/payment flows including card management, Apple Pay (custom native iOS module), Telr SDK integration, and secure asset handling.
- Implemented real-time messaging via GraphQL subscriptions and WebSocket for live chat, presence, and push notifications; added biometric auth via Keychain.
- Optimized rendering, list virtualization, and bundle size; resolved production issues using Sentry and participated in code reviews across dev/staging/production.
Senior Frontend Developer
SperaxDAO
- Led frontend development for SPERAX, a DeFi/Web3 protocol - owning feature design, implementation, and production delivery (sperax.io).
- Built crypto wallet integrations with Wagmi and Ethers.js - wallet connect, transaction signing, and on-chain asset interactions.
- Delivered responsive interfaces for staking, yield, and protocol flows; collaborated with smart-contract and backend teams on API and blockchain data.
- Established code reviews, automated testing, performance monitoring (Lighthouse), documentation, and mentored junior developers to improve release velocity.
Associate Frontend Developer
Rapid Innovation
- Shipped 5-6 full products from scratch, translating Figma/Adobe XD designs into pixel-perfect, production-ready React applications.
- Built high-performance frontend features with strong focus on UX, accessibility, and maintainable component architecture.
- Wrote Jest unit and Cypress E2E tests for critical user journeys; partnered with cross-functional teams on tight launch timelines.
Projects
YP Club
- Production membership app with real-time chat, wallet/payments, biometrics, GraphQL/WebSocket messaging, and iOS/Android store releases (ypclub.com).
Sperax (DeFi / Web3)
- DeFi protocol frontend enabling wallet connect, on-chain transactions, staking UI, and yield interactions for live protocol users (sperax.io).
PICO Wallet (Web3)
- Non-custodial crypto wallet supporting asset management, transaction signing, wallet connect, and secure Web3 interactions.
KIMO AI (E-learning)
- AI-powered e-learning platform with interactive courses, personalized learning paths, and user progress tracking.
Leaderboard Standings
Leaderboard Position Pending
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Assessment Highlights
Assessments Not Completed
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AI Collaboration Score
AI Collaboration Score Pending
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Role Compatibility Profile
Role Compatibility Analysis Pending
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Achievements
Achievements Not Earned
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About Details
Professional Bio
Senior frontend developer with 8+ years of experience building production web and mobile applications across React, React Native, and TypeScript. Experienced in Web3/DeFi and shipping products from zero to production for iOS, Android, and web platforms.
B.Tech
MSIT, New Delhi, India (2014 - 2018)