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Chowdhury Md Rajib Sarwar

Senior Mobile Solutions Architect | iOS & Android

Architecting scalable mobile ecosystems, automating CI/CD pipelines, and modernizing legacy codebases.
I specialize in transforming monolithic architectures into highly maintainable, multi-variant mobile platforms across iOS and Android, bridging the gap between native development and robust DevOps practices.


🕋 Featured Indie Project: Qibrah

Qibrah App Banner

Download on the App Store

Qibrah is a comprehensive, production-grade iOS application that showcases advanced native capabilities, high-performance rendering, and modern declarative design.

  • Architecture & State Management: Architected entirely with SwiftUI and modern reactive frameworks (Combine, async/await), establishing robust data flow and state management for complex, data-heavy interfaces.
  • Custom UI & Advanced Layouts: Engineered highly customized, dynamic UI components—including complex flow layouts and dynamic Right-to-Left (RTL) rendering engines—overcoming standard framework limitations to deliver pixel-perfect designs.
  • Hardware & Framework Integration: Integrated advanced iOS capabilities, including AVAudioEngine and SFSpeechRecognizer, to build real-time, highly responsive interactive features with seamless hardware synchronization.
  • Performance Optimization: Optimized app footprint by implementing efficient data decoding, caching strategies, and structured concurrency to ensure smooth 60fps scrolling on complex list views.

🚀 Core Engineering Prowess

As a Senior Engineer, my focus extends beyond UI implementation into full-scale mobile system architecture, concurrency, and platform security.

  • iOS Architecture & Modernization: Spearheading migrations from legacy UIKit to SwiftUI, building reactive, state-driven interfaces using MVVM and Clean Architecture.
  • Android Build Systems & DevOps: Architecting multi-dimensional build variants using Gradle Kotlin DSL. Engineering matrix-strategy GitHub Actions pipelines and Fastlane for automated concurrent builds, dynamic cryptographic signing, and zero-touch deployments.
  • Dependency & Scale Management: Resolving complex multi-variant dependency conflicts, utilizing Swift Package Manager (SPM) for iOS modularization, and isolating SDK-specific components to support extensive white-label applications.
  • Complex Integrations: Building advanced GPS routing solutions (GraphHopper, CoreLocation) and optimizing secure, low-latency payment systems (Payrix, Apple Pay, Google Pay, NFC hardware integrations).

🛠️ Technical Ecosystem

🍎 iOS Stack Swift Objective-C SwiftUI UIKit Combine async/await AVFoundation CoreLocation SPM

🤖 Android Stack Kotlin Java Jetpack Compose Coroutines Room Hilt / Dagger KSP Gradle KTS

⚙️ DevOps, Architecture & Backend GitHub Actions Fastlane Xcode Cloud Play App Signing MVVM Clean Architecture Firebase Spring Boot MongoDB REST APIs


💼 Featured Engineering Impact

  • Limosys LLC (Senior Software Engineer): Architected the core mobile infrastructure powering ride-sharing applications used by 200+ companies. Optimized complex payment gateways (Apple Pay/NFC) and dynamic routing algorithms, significantly reducing transaction failures and crash rates.
  • Multi-Variant App Ecosystems: Built dynamic routing and centralized utility structures leveraging BuildConfig generation and iOS target configurations to handle diverse application logic across multiple active build flavors.
  • NJIT Dana Project (Team Lead): Directed a cross-functional engineering team to transform a sprawling digital archive system into high-performing native mobile applications.
  • Affle Vizury SDK (Engineering Manager): Scaled mobile SDK solutions for commerce marketing, optimizing push notification delivery, payload handling, and background processing.

📊 GitHub Analytics


🤝 Let’s Connect

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