Shubhanshu Kumar — Senior Software Engineer
ABOUT

I build software from architecture to production.

I'm Shubhanshu Kumar, also known online as Shubhanshu Barnwal. I'm a Senior Software Engineer with a strong foundation in React Native and native iOS. My work spans mobile and web applications, backend APIs, relational databases, and cloud infrastructure — connecting product requirements to maintainable systems.

I design systems from scratch, build services with Node.js and Express, and work with PostgreSQL, MySQL, and Redis. I configure AWS infrastructure including EC2, RDS, and S3, work with GCP, and build CI/CD pipelines for reliable delivery.

Code reviews, debugging, observability, and performance are part of how I keep software dependable. I also maintain open-source React Native tools and contribute improvements to the libraries I use.

#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

WEB

ReactNext.jsTypeScriptJavaScript

LANGUAGES

TypeScriptJavaScriptSwift

BACKEND

file_type_nodeNode.jsfile_type_nodeExpressREST APIsSocket.io

DATABASES

databases-and-servers/databases/mysql Created with Sketch. PostgreSQL databases-and-servers/databases/mysql Created with Sketch. MySQLRedis databases-and-servers/databases/mysql Created with Sketch. SQL

CLOUD

AWSEC2RDSS3GCP Firebase

DELIVERY & TOOLS

GitHub ActionsCI/CDDeployment automationCodePush / OTAGit Xcode

DESIGN & QUALITY

System designAPI designDatabase modelingPR reviewsObservabilityPerformance
#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.