Available for Opportunities

Barath
Erulappan

React Native Engineer building production mobile apps — 200K+ users across iOS, Android and Huawei AppGallery.

200K+
Active Users
2+yr
Experience
2★
Awards Won
3
Platforms
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🏆Star Performer of the Year 2026
🥇Star Rookie of the Year 2025
📱200,000+ Active Users
🔐Cleared Client Security Review
🚀3 App Stores Shipped
⚡30% Faster App Launch
✍️Published on Hashnode & Dev.to
🏆Star Performer of the Year 2026
🥇Star Rookie of the Year 2025
📱200,000+ Active Users
🔐Cleared Client Security Review
🚀3 App Stores Shipped
⚡30% Faster App Launch
✍️Published on Hashnode & Dev.to
About Me

Engineer.
Owner.
Mobile Builder.

I'm a React Native engineer with 2+ years of experience. I owned the mobile app of a live fintech product used by 200,000+ people across Android, iOS and Huawei AppGallery — recognised with two consecutive company awards.

I work at the intersection of complex product requirements and clean engineering — from custom Swift native modules for Apple Pay to financial-grade encryption.

📱
Mobile First
React Native engineer shipping production apps on iOS, Android and Huawei AppGallery.
🔒
Security Expert
AES-256 encryption, biometric auth, jailbreak detection and secure key storage.
⚡
Performance
30% faster launch, 60 FPS animations via Hermes, lazy loading, and Reanimated.
🚀
Full Ownership
Figma to App Store — I own the build, the release pipeline and post-launch stability.
Stack

Skills & Technologies

Languages
Core Languages
JavaScriptTypeScriptSQLSwiftPython
Mobile
Mobile Development
React NativeReact NavigationRedux ToolkitZustandContext APIReanimatediOSAndroidHuawei
Web
Web Development
ReactTailwind CSSNode.jsExpressREST APIs
Backend & Cloud
Server & Cloud
PythonFastAPIFirebaseREST APIsSQL
DevOps
Release & Automation
GitHub ActionsFastlaneCrashlyticsGitPostmanFigma
Security
Security & Compliance
AES EncryptionBiometric AuthApple PayJailbreak DetectionSecure Key Storage
Career

Work Experience

Cogniwide
Jun 2024 – Sep 2026 · 2+ yrs
Software Engineer
Cogniwide · Dec 2024 – Sep 2026
  • Owned the mobile app of a live fintech money exchange product serving 200,000+ active users across Android, iOS and Huawei AppGallery.
  • Integrated Apple Pay through a custom Swift native module, plus KNET payments, biometric auth (Face ID / fingerprint), Firebase push notifications, PDF generation, media upload and interactive maps.
  • Implemented AES-256 encryption, jailbreak detection and secure key storage; the app cleared the client's security review before release.
  • Cut launch time by 30% and kept animations at 60 FPS using Hermes tuning, lazy loading and Reanimated.
  • Reviewed Firebase Crashlytics weekly and shipped monthly releases to the App Store, Google Play and Huawei AppGallery via Fastlane and GitHub Actions.
  • Architected the frontend (React, Vite, Tailwind CSS) and Python (FastAPI) backend of an enterprise Visa Management System and managed 4 junior developers through delivery.
  • Designed the architecture for a School Management app (React Native) and guided 2 junior developers.
  • Awarded Star Rookie of the Year (2025) and Star Performer of the Year (2026) at Cogniwide.
Associate Software Engineer
Cogniwide · Jun 2024 – Nov 2024
  • Built the frontend of the money exchange app from Figma designs, including folder structure, navigation and state management (50+ screens).
  • Gathered requirements from clients and internal leads and turned them into frontend solutions.
React NativeTypeScriptRedux ToolkitFirebaseSwiftFastlaneReactPython
Work

Projects

📱 Mobile · Production
01
Money Exchange App

A production-grade full-stack fintech app that I owned end to end — from Figma designs to live stores across Android, iOS and Huawei. Handles real financial transactions with security built in.

200K+
Users
3
Stores
50+
Screens
React NativeSwiftFirebaseTypeScript
💱
Biometric Authentication
Apple Pay via Custom Native Module
Real-time Currency Exchange Rates
Interactive Maps & Branch Locator
In-app Multi-language Translation
PDF Receipt Generation
🌐 Web · Full Stack
02
Visa Management System

An enterprise web application for visa management. I architected the frontend and the Python backend, and managed a team of 4 junior developers through delivery. UAT completed.

4
Developers Led
UAT
Completed
ReactViteTailwind CSSPythonFastAPI
🧪 Personal Project
03
SpendWise: AI Expense Tracker
🤖 Gemini AI · In Development

An AI-powered personal finance app with Gemini integration, category-wise expense logging, monthly budgets and visual charts. Firebase backend, with MMKV and Zustand for offline-first local storage.

Watch Demo
React NativeTypeScriptGemini AIFirebaseZustandMMKV
🧪 Personal Project
04
App Lock
📱 React Native

A security app that lets users lock individual apps with PIN or pattern protection. Clean UI with smooth animations and settings management.

Watch Demo
React NativeTypeScript
Writing

Published Articles

✍️ Technical Article · 2025
🍎
How I Integrated Apple Pay in React Native After Every Package Failed Me

How I built a custom Swift native module to wire up Apple Pay when no third-party package could do the job, and shipped it to production.

Swift · React Native
Native Modules
Apple Pay
Read on Hashnode Read on Dev.to
PKPaymentAuthorizationController
→ Custom Native Module → React Native Bridge ✓
Recognition

Awards & Honours

🏆
2026 · Cogniwide
Star Performer of the Year
Recognised for owning the flagship mobile product (200K+ users) and for architecting and leading delivery of additional products.
🥇
2025 · Cogniwide
Star Rookie of the Year
Recognised in year one for building the frontend of a live production app from Figma designs.
🔐
Security Milestone
Client Security Review Cleared
Implemented AES-256 encryption, jailbreak detection and secure key storage; the app cleared the client's security review before release.
Milestones

Achievements

🌍
200,000+ Users Across 3 Platforms
Launched and maintained a live fintech app on Google Play, App Store, and Huawei AppGallery — as the owner of the mobile app.
⚡
30% Faster Launch & 60 FPS
Delivered measurable performance gains through Hermes engine, lazy loading, bundle optimisation, and Reanimated animations.
🛡️
Client Security Review Cleared
Implemented AES-256 encryption, biometric auth, jailbreak detection and secure key storage; cleared the client's review before release.
🎯
Owned a Cross-Platform Product, Figma to 3 Stores
Took a complete cross-platform product from designs to Google Play, the App Store and Huawei AppGallery.
Background

Education

2020 – 2024
Mepco Schlenk Engineering College
B.E. in Computer Science and Engineering
CGPA: 7.85 / 10
Data Structures · Algorithms · OS · DBMS · OOP · Networks · ML
May 2020
Hilton Matric Higher Secondary School
Higher Secondary Certificate — Computer Science
92.17%

Ready to
Build Together?

Open to React Native roles and collaborations. Let's talk.

✉ barath.e2003@gmail.com 📞 +91 74020 07591 ⌥ github.com/Barath333 in linkedin.com/in/barathe31 ✍️ buildwithbarath.hashnode.dev