Shubhanshu Kumar — Senior React Native Engineer
ABOUT

I optimize for apps that stay fast and stay shipped.

I'm a senior engineer focused on React Native — building cross-platform apps that hold up in production, not just in a demo. Over the last three years I've gone from building products end-to-end to leading architecture on apps that live on the App Store and serve 100k+ people daily.

Most of my best work is unglamorous: migrating a live app to the New Architecture without breaking it, making payments reliable across multiple providers, keeping native iOS modules healthy, and cutting the render and memory costs that users actually feel. When I hit a problem worth solving twice, I extract it into a package and open-source it.

#1 — EXPERIENCE

Where I've worked.

Jul 2025 — Present

Senior Software EngineerIllumine

React Native and native iOS development for production apps serving 100k+ users.

  • Drove the migration to React Native's New Architecture (Fabric & Hermes); upgraded RN 0.73 → 0.84.
  • Refactored legacy class components into functional components with hooks, cutting complexity.
  • Integrated multi-provider payments (Stripe, Adyen, CC Avenue, Easebuzz) with native Swift iOS handling.
  • Built and maintained native iOS modules in Swift for platform-specific capabilities.
  • Optimized performance, memory, and responsiveness across native and cross-platform layers.
  • Diagnosed and resolved production issues, improving crash-free sessions and release quality.

Dec 2023 — Jun 2025

Lead App DeveloperWiingy

Owned end-to-end mobile development for Wiingy's student and tutor platforms.

  • Built cross-platform apps from Figma to production and led architectural decisions.
  • Built end-to-end real-time chat and in-app customer support (Node.js, Socket.io, AWS S3) that lifted conversion by ~60%.
  • Shipped OTA releases via CodePush for faster, more reliable deployments.
  • Integrated Firebase Cloud Messaging for notifications and automated reminder workflows.

Jun 2023 — Nov 2023

React Native DeveloperMidknight Studios

Built a cross-platform social app with a Next.js admin panel, from scratch.

  • Implemented Redux state management and a real-time backend (Node.js, Socket.io, SQL).
  • Integrated AWS S3, SMTP, and SMS gateways for full-stack functionality.
  • Enabled category-based data retrieval and collaborated via Firebase and Figma.

Sep 2022 — Dec 2022

AWS Cloud InternF13 Technologies

Earned AWS certifications and deployed React web apps on AWS.

  • Earned multiple AWS certifications across global and regional services.
  • Deployed ReactJS web apps on AWS S3 using native AWS tooling.
#2 — SKILLS

What I work with.

MOBILE

React NativeSwiftiOSAndroid-color Created with Sketch. AndroidUIKit

LANGUAGES

TypeScriptJavaScriptSwift

BACKEND

file_type_nodeNode.jsSocket.io databases-and-servers/databases/mysql Created with Sketch. SQLfile_type_nodeExpress

INFRA & TOOLS

AWSGCP FirebaseCodePush / OTAGit Xcode
#3 — EDUCATION

Background.

2020 — 2023

B.E. in Computer ScienceHKBKCE, VTU
  • Coordinator — College Welfare Committee (CWC).
  • Coordinator — Literary Club and Farewell 2k22.

2017 — 2020

Diploma in Computer ScienceSVIET, PSBTE
  • Coordinator — Spontania Fest and Aahvan Fest.
  • Core Team — Zonal Youth Fest.