Subham Bikash Behera
Senior Android Developer/Kotlin · Jetpack Compose · MVVM · Coroutines /Spring Boot & Full Stack /FinTech, Crypto & Healthcare systems
Senior Android Developer with 4+ years of experience building scalable, secure Android applications, now extending into full-stack development with Java & Spring Boot. Developed and deployed Pi42, India's first Crypto-INR perpetual futures app, reaching 100K+ Play Store downloads and $6B+ in transaction volume. Contributed core banking features for Mauritius Commercial Bank, serving millions of daily users, and built warehouse mobility solutions for Globus Medical on Zebra handheld devices. Strong expertise in real-time systems, secure financial applications, REST API design, and performance optimization across the stack.
Languages
Frameworks & Libraries
Backend & Full Stack
Architecture & Concepts
Tools & Expertise
- Developed and optimized high-scale fintech payment modules serving millions of active users with secure, reliable transaction processing.
- Built core banking features: QR-based Scan to Pay, bill payments, prepaid card systems, scheduled payments, and PayPal international integration.
- Implemented SSL certificate pinning and secure API communication to harden mobile transaction security.
- Collaborated with cross-functional onsite teams in agile sprints to ship stable, production-ready banking features.
- Built enterprise-grade warehouse mobility solutions for Zebra handheld devices with barcode-driven, real-time scanning workflows.
- Engineered a scalable multi-modular Android system with reusable BLE and Wi-Fi integration layers for IoT extensibility.
- Replaced costly third-party enterprise plugins with in-house solutions, cutting annual operational costs by ~$24,000.
- Published reusable modular Android libraries on JitPack following Clean Architecture and versioning best practices.
- Built a high-performance Auto-Sync engine handling 20,000+ media files with near real-time, background synchronization.
- Designed a scalable upload architecture using WorkManager for reliable transfers, retries, and network failure handling.
- Mentored and coordinated a team of 3 Android engineers across feature delivery cycles.
- Migrated Morphone, D180, and Wiseasy P3 codebases to Kotlin with MVVM Clean Architecture.
- Developed an IRIS Scanner app for biometric fintech transactions with the Wiseasy China team.
- Implemented JWT-based encryption for secure financial transaction processing across POS devices.
A cryptocurrency trading platform built from scratch following MVVM Clean Architecture and SOLID principles. Freelance, Jan – Mar 2026.
- WebSocket connection pooling with auto-reconnection for real-time order book & trade data.
- Multi-layer caching (Room DB + in-memory) cutting server load by 60%.
- Custom Canvas-based candlestick, line & area chart rendering.
- Market / Limit / Stop-Loss orders, 2x–150x leverage, live P&L calculation.
- Biometric auth, 2FA, certificate pinning, AES-256 encryption.
14 JUN 2026
LaunchedEffect, DisposableEffect, and rememberCoroutineScope — when to use which.
30 JUN 2026
Finding leaks, handling bitmaps, and profiling for low-end devices in production apps.
COMING SOON
A framework for approaching Android system design rounds.