Shahzad Code

I’m an Android Engineer focused on building production-grade Android applications using Kotlin, MVVM, and Clean Architecture. I rely on Dependency Injection (Hilt) and Kotlin Coroutines to deliver concurrency-safe, lifecycle-aware features.

In my project work, I delivered a full-stack booking platform integrating 30+ REST APIs with Jetpack Navigation, Room, and DataStore. I also implemented real-time slot availability using Socket.IO across Android and backend, plus user notifications via Firebase Cloud Messaging.

For reliability and data integrity, I engineered Redis Distributed Locking with reservation windows to prevent race conditions in concurrent bookings, including automated cleanup jobs. On the backend side, I supported JWT-based authentication, RBAC across four roles, and MongoDB multi-document transactions paired with cron jobs for wallet operations and no-show/timeout handling.

I’m product-minded with a strong Data Structures & Algorithms foundation (220+ problems solved), and I’m comfortable owning features end-to-end—Android UI through backend service—using tools and systems design practices geared toward performance, reliability, and user experience.