Resume - Md Aslam Hossin - Android Engineer

Professional Summary

Android engineer with 9+ years building high-performance mobile applications in Kotlin and Java. Proven fintech expertise through PayPay project work (network security, SDK integration) and current in-house operations at Rakuten. Strong ownership track record: led Java-to-Kotlin migration (60% conversion, 3% crash reduction) and architectural refactoring initiatives. Experienced in TDD, agile practices, and cross-functional collaboration.

Key Qualifications

9+ years Android development; expert in Kotlin, Java, Jetpack Compose, coroutines, Flow, MVVM, Redux State Management, Clean Architecture
Advanced expertise in Redux architecture pattern for scalable state management; inspired by Redux.js foundation with proven implementation across multiple production apps
Fintech experience: PayPay network security implementation, SDK integrations (Sendbird, Firebase); current role at Rakuten fintech ecosystem
Proven ownership: Led Java-to-Kotlin migration (60% codebase, 3% crash reduction); refactored Rakuten core features resolving technical debt
Test-Driven Development: Hands-on TDD experience on PayPay and Rakuten projects; JUnit5, MockK with CI/CD pipelines
Strong REST API integration, agile development, code reviews, and in-house service operation
Business conversational English; actively learning Japanese

Work Experience

Application Engineer (Android)

Oct 2024 - Present

Rakuten (via Robert Walters Japan KK) • Tokyo, Japan

Feature development for Rakuten Ichiba storefront apps

Identified and refactored core feature with technical debt; designed Clean Architecture solution
Integrated Modiface SDK for AR virtual try-on features with optimized performance
Translate Figma designs into production code using Compose and View system
Implement coroutines/Flow pipelines and REST API integrations with Retrofit
Practice TDD with JUnit5 and MockK for robustness

Senior Mobile Engineer

Nov 2018 - Sep 2024

Monstarlab • Dhaka, Bangladesh

Delivered projects for international clients across ride-sharing, fintech, health, and retail

PayPay (Japan): Integrated Sendbird SDK, reviewed network security, practiced TDD
TAXA 4x35 (Denmark): Led Java-to-Kotlin migration (60% conversion), reduced crashes by 30%
GeneLife 3.0 (Japan): Built genome visualizations with complex animations - Good Design Award 2019 winner
Mitsukoshi Isetan (Japan): Launched remote video chat for personal shopping - $276M revenue FY2020
Applied Kotlin coroutines and Flow across projects; participated in agile ceremonies

Software Developer

Sep 2016 - Oct 2018

DODOCK LLC • Dhaka, Bangladesh

Developed Android app for media streaming platform

Integrated Wowza SDK for live streaming with memory optimization
Profiled with Android Studio Profiler and LeakCanary
Built REST/JSON integrations for authentication and user management

Education

Master of Science in Information Technology

2016 - 2017

Jahangirnagar University

Bachelor of Science in Information Technology

2011 - 2016

Jahangirnagar University

Kotlin Coroutines and Flow for Android Development

2023

Udemy

Certificate: UC-8be9ea26-4fbe-4fc9-90b3-deb65bc0f552

Technical Skills

Android

Kotlin, Java, Jetpack Compose, View System, RecyclerView, Coroutines, Flow, Room, WorkManager, Navigation, Lifecycle

Architecture

MVVM, Redux (State Management), MVI, Clean Architecture, Repository Pattern, DI (Hilt/Koin), OOP

Performance & Optimization

Memory Management, Heap Analysis, LeakCanary, Profiler, ANR Prevention

SDK Integration

Modiface, Sendbird, Firebase, Analytics SDK, Wowza, Google Maps, Location Services

Testing & CI/CD

TDD, JUnit5, MockK, Integration Testing, Bitrise, GitHub Actions, Crashlytics

E-commerce

Inventory Management, Cart Management, Payment Integration, Product Catalog, Stock Handling

Tools

Android Studio, Gradle, Git, Profiler, LeakCanary, Jira, Figma

Languages

Business English, Japanese (Learning)

Currently Learning

🚀 Emerging Tech

Kotlin Multiplatform Mobile (KMM), Jetpack DataStore (replacing SharedPreferences)

🚀 Advanced Patterns

Model-View-Intent (MVI), Feature Flags & A/B Testing

🚀 Backend Integration

GraphQL, WebSocket Real-time Communication

🚀 AI/ML

TensorFlow Lite for Mobile, On-device ML Models