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Hossam Elrifaei

@hossamelrifaei

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I build scalable Android and mobile platforms for fintech, e-commerce, mobility, and super apps.

Egypt

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I've architected and scaled Android products at Careem and Gojek, including Careem Food and 0-to-1 mobile architecture for GoPay and GoBiz. My work supports high-throughput transactions, complex super-app experiences, and large-scale mobile platforms.

Across 15+ years, I've built with Kotlin, Kotlin Multiplatform, Jetpack Compose, modular architecture, and performance observability. I also lead refactors, mentor engineers, and deliver mobile products from early architecture through production.

Experience

Work history, roles, and key accomplishments

Current

Senior Android Consultant & Mobile Architect

Current

Freelance / Independent Consulting

May 2024 - Present (2 years 4 months)

Engineered high-performance Android solutions using Kotlin and Jetpack Compose, focusing on scalable MVVM/MVI architectures and robust dependency injection. Designed a 0-to-1 mobility platform with IoT via BLE and real-time telematics, and developed an AI-powered contact management app.

Kotlin Jetpack Compose MVVM MVI Dependency Injection Bluetooth Low Energy Telematics AI

Senior Android Engineer

Careem

Apr 2023 - May 2024 (1 year 1 month)

Architected and scaled core features for the Careem Food vertical using Kotlin, Coroutines, and Flow to manage high-concurrency order processing. Modernized legacy tracking infrastructure, led complex refactors, and mentored junior engineers.

Kotlin Coroutines Flow Performance Profiling Code Review Mentorship

Senior Product Engineer

Gojek

Nov 2018 - Mar 2023 (4 years 4 months)

Owned the 0-to-1 mobile architecture for GoPay and GoBiz, driving modularization for high-throughput fintech transactions. Optimized merchant payment reliability with MVI patterns and Coroutines-based concurrency, and championed TDD and mentoring.

Kotlin MVI Coroutines Modularization Test Driven Development Fintech Code Review

Senior Android Developer

AppSynth

May 2018 - Oct 2018 (5 months)

Revitalized the Shopat24 e-commerce platform by refactoring monolithic legacy code into a clean, modular architecture, enhancing stability and reducing crash rates with reactive programming.

Android Refactoring Reactive Programming Modular Architectures

Senior Android Developer

Iglu

Feb 2018 - May 2018 (3 months)

Engineered hardware-software communication protocols via Bluetooth to process real-time biometric data, translating sensor inputs into actionable treatment recommendations.

Bluetooth Biometrics Android

Senior Android Developer

Lazada Group

Jun 2016 - Jan 2018 (1 year 7 months)

Collaborated in a large cross-regional engineering organization to maintain one of Southeast Asia's largest Android apps, optimizing CI/CD pipelines and supporting 50M+ users. Enhanced scalability with design patterns maintaining 99.5% crash-free sessions.

Android CI CD Design Patterns Scalability

Mobile Application Developer

Previous Experience

Jan 2011 - Dec 2016 (5 years 11 months)

Directed technical delivery of pharmaceutical applications at SCOPE Communications, led a remote team for a pediatric health platform, and prototyped Android apps at IVAS/Logicsware/Beshara Group.

Android iOS Team Leadership Project Management