App LogoApp name
RK

Rajan Kumar

Open to work8 years experience

Senior Frontend Developer

New Delhi, IndiaTarget Roles: Backend Engineer • Full-Stack Developer • Frontend Specialist

Senior Frontend Developer | React · React Native · Web3

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Standing Rank

Rank Not Available

Developer Badges

Badges Pending

Skills & Technologies

43 skills
reactreact nativereact jstypescriptjavascriptnext.jsnode.jstailwindiosandroidgraphqlrestwebsockettanstack queryreduxzustandmmkvwagmiethers.jswallet connectdefiweb3blockchain integrationsjestcypresssentrygitci/cdfigmafirebasereact navigationcursorclaude codechatgptgithub copilotprompt engineeringai pair programmingopenai apianthropic apillm integrationvercel ai sdkai-assisted developmentai code review

Work Experience

Senior React Native Developer

YP Club

Aug 2025 - May 2026 Remote (Dubai)
  • 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

Sep 2022 - Jul 2025 Remote (USA)
  • 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

Jun 2018 - Aug 2022 Noida, India
  • 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

React NativeTypeScriptGraphQL
  • Production membership app with real-time chat, wallet/payments, biometrics, GraphQL/WebSocket messaging, and iOS/Android store releases (ypclub.com).

Sperax (DeFi / Web3)

View Project
ReactWagmiEthers.js
  • DeFi protocol frontend enabling wallet connect, on-chain transactions, staking UI, and yield interactions for live protocol users (sperax.io).

PICO Wallet (Web3)

ReactWeb3Ethers.js
  • Non-custodial crypto wallet supporting asset management, transaction signing, wallet connect, and secure Web3 interactions.

KIMO AI (E-learning)

ReactTypeScriptAI
  • AI-powered e-learning platform with interactive courses, personalized learning paths, and user progress tracking.

Leaderboard Standings

Leaderboard Position Pending

Global test scores, peer standing percentiles, and algorithm leaderboard ranks are updated dynamically.

Assessment Highlights

Assessments Not Completed

Coding evaluations, system assessment results, and conceptual score badges will appear here after taking a test.

AI Collaboration Score

AI Collaboration Score Pending

Developer coding behavior, assistant cooperation, and AI pair-programming indicators are evaluated during live coding sessions.

Role Compatibility Profile

Role Compatibility Analysis Pending

Custom matching reports, candidate role compatibility percentiles, and core engineer strength profiles are processed once conceptual code screenings are complete.

Achievements

Achievements Not Earned

Special rewards, developer badges, system recognition certificates, and conceptual milestones will display here.

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 in Software Engineering, Data Structures, Web Technologies, Database Systems

MSIT, New Delhi, India (2014 - 2018)

Languages: English, Hindi
Email: Locked
Rajan Kumar - Profile | Swiftcruit