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Subhash703/README.md

> whoami

name: Subhash Chandra
role: Software Engineer @ Juspay
focus: Payment SDK Infrastructure & Integrations
location: India

I design and ship scalable software solutions across mobile and backend — from architecting payment SDK infrastructure to building end-to-end product features that serve millions of users. I thrive at the intersection of engineering depth and product impact.

> cat skills.json

{
  "languages": ["TypeScript", "Kotlin", "Swift", "Java", "JavaScript"],
  "mobile": ["Android", "iOS", "React Native", "Flutter", "Cross Platform Plugins"],
  "frontend": ["HTML5/CSS","React", "Next.js", "Tailwind CSS"],
  "backend": ["Node.js", "NestJS", "Microservices", "REST APIs"],
  "infra": ["Docker", "CI/CD"],
  "architecture": ["System Design", "SDK Architecture", "API Design"]
}

> ls projects/

🌎 Pix Payment Journeys — LATAM Expansion

Leading frontend & mobile SDK efforts for Brazil — owning end-to-end Pix payment flows (ITP / consent-based) across mobile SDK, plugin integrations, and backend coordination.

Kotlin Swift Pix Server-Driven UI

🛡️ 3DS 2.0 Secure Payments SDK

Developed 3D Secure 2.0 SDK for card payment authentication with server-driven UI flows across native Android & iOS apps.

3DS2 Kotlin Swift Card Payments

🔌 Cross-Platform Plugin Suite

Designed & owned React Native plugin end-to-end. Solely built and shipped Capacitor & Flutter plugins from scratch — architecture, native bridges, and cross-platform compatibility.

React Native Flutter Capacitor Kotlin Swift

📱 iOS UPI SDK

Developed an iOS SDK for UPI QR and In-App payments in Swift, enabling instant payment capabilities on Apple platforms.

Swift UPI QR Payments iOS

⚙️ Android SDK Stability Overhaul

Rewrote the logger and thread pool to handle concurrency correctly — significantly reducing crash rates across a 250M+ device fleet.

Kotlin Concurrency Performance Android

🚀 Core Mobile SDK — SWAT Team

Core member of a 5-engineer team managing Juspay's mobile SDK deployed across 250M+ devices. Mentoring engineers and standardizing clean, modular architecture across SDK versions.

SDK Architecture Code Reviews 250M+ Devices

> cat interests.md

╔══════════════════════════════════════════════════════════════╗
║  🧩 Developer Experience (DX)    🏗️ System Design          ║
║  📱 Mobile Architecture          🔧 Productivity Systems   ║
║  🧠 Psychology & Observation     🎯 Performance Tuning     ║
╚══════════════════════════════════════════════════════════════╝

📊 GitHub Stats


github contribution snake animation



// building things developers love to use

Pinned Loading

  1. Event_Booking_App Event_Booking_App Public

    This is a responsive event booking app

    CSS

  2. GeekForGeeks GeekForGeeks Public

    C++ 1

  3. UMS_LOGIN_LAYOUT UMS_LOGIN_LAYOUT Public

    CSS

  4. Web-Mania-Project Web-Mania-Project Public

    JavaScript

  5. WhatsHeppeningCardUI WhatsHeppeningCardUI Public

    A website challenge from UIdesignDaily

    HTML

  6. scfy-HTML-CSS-Javascript scfy-HTML-CSS-Javascript Public

    HTML