Open to full time opportunities in Pakistan, GCC, Europe, and worldwide remote roles.

Senior Android Engineer Building Mission-Critical Native Apps at Scale.

Senior Android Engineer with 5+ years of experience building native Android apps in Kotlin and Jetpack Compose, with a focus on Clean Architecture, modular design and production stability. Built five SaaS e-commerce, food-ordering and B2C apps with in-app payments through Checkout.com, and SAR/YamamaCM, an offline-first workforce management app for the Saudi Ministry of Transport used during Hajj 2025 and 2026. Results include 99.99% crash-free sessions, ~90% fewer ANRs and ~50% faster cold start. Works with teams across Saudi Arabia, Egypt and India.

HAHammad Ahmed
βœ“
Hammad Ahmed
Islamabad, Pakistanβ€’Master of Computer Science (NUST)
Get in Touch
WhatsApp (+92 311 9069464)
Stability
99.99% Crash-Free
Performance
~90% ANRs Cut
Production
5 SaaS Apps
09:41
SAR
YamamaCM
Hajj 1446H Operations
Masha'er Hajj SectorShift: 08:00 – 16:00
Supervisor In-Charge: Capt. Fahad Al-Otaibi
Candidate Roster (Take Attendance)Tap to update status
Hammad AhmedSAR-101
Lead Crowd Controller
πŸ“ Mina Platform Aβ€’Check-in: 07:54 AM
present
Faisal Al-ZahraniSAR-102
Station Safety Specialist
πŸ“ Mina Platform Aβ€’Check-in: 07:58 AM
present
Tariq MansoorSAR-103
Crowd Flow Marshal
πŸ“ Jamarat Post 4β€’Check-in: 08:12 AM
break
Sultan Al-GhamdiSAR-104
Emergency Responder
πŸ“ Muzdalifah Sector 2β€’Check-in: -
absent
Omar Al-HarbiSAR-105
Platform Marshaller
πŸ“ Mina Platform Bβ€’Check-in: 08:05 AM
present
Live Interactive Android Demo Simulator
Proven Engineering Outcomes

Quantifiable Impact in Production

Hiring managers value results over buzzwords. Here is what I have systematically delivered across 5+ years of shipping enterprise Android apps.

Verified Metric
99.99%
Crash-Free Rate

Maintained across production releases through modular architecture and SOLID codebases

Verified Metric
~90%
Fewer ANRs

Eliminated UI freezes by moving heavy tasks off main thread via Coroutines & Flow

Verified Metric
5 SaaS Apps
Live on Google Play

End to end delivery of e commerce, F&B, B2C, and digital wallet solutions with integrated checkout.

Verified Metric
Hajj 25/26
SAR / YamamaCM App

Built an offline first app for Saudi Ministry of Transport with Room based data sync for critical field operations.

Verified Metric
~50%
Faster Cold Starts

Optimized memory, startup traces, and dependency injection using Android Profiler.

Verified Metric
50+ Tools
In <15MB Package

Developed a lightweight toolbox with 50+ utilities, device monitoring, and anti theft features and more

Senior Android Engineering Services

Engineering Capabilities & Contract Specializations

Delivering high-reliability native Android systemsβ€”from mission-critical government offline platforms to multi-tenant e-commerce architectures on Google Play.

Specialized

Native Android App Development

From idea to Play Store, built in Kotlin

End-to-end development of production-ready Android apps using Kotlin and Jetpack Compose. I turn product requirements into fast, maintainable apps that follow current platform standards.

Key Deliverables
Production-ready Android app
Clean documented source code
Play Store release setup
Post-launch support
KotlinJetpack ComposeMaterial 3
Discuss Android Requirements
Specialized

Clean Architecture & Scalable App Design

Structure that keeps growing apps maintainable

Designing app architecture with clear Presentation, Domain, and Data layers so features can be added, tested, and changed without breaking existing code.

Key Deliverables
Architecture blueprint and module structure
MVVM / MVI implementation
Dependency injection setup
Team coding guidelines
Clean ArchitectureMVVMMVIHilt
Discuss Android Requirements
Specialized

Firebase, REST API & Third-Party Integrations

Connect your app to the services it needs

Integrating Android apps with backends and third-party services: REST APIs, Firebase, push notifications, authentication, maps, and payment gateways. Reliable, secure, and easy to maintain.

Key Deliverables
REST API integration with error handling
Firebase Auth Firestore and push notifications
Payment gateway and Google Maps setup
Secure token and session handling
FirebaseRetrofitFCMGoogle Maps
Discuss Android Requirements
Specialized

Performance Optimization & Stability Audits

Faster startup, smoother UI, fewer crashes

Profiling and improving existing apps for startup time, memory use, UI smoothness, and crash rate, with fixes prioritized by real impact.

Key Deliverables
Performance and crash audit report
Prioritized fix list
Implemented optimizations
ProfilerCrashlyticsBaseline ProfilesLeakCanary
Discuss Android Requirements
Specialized

Legacy App Modernization & Refactoring

Move from old code to a modern stack safely

Incrementally migrating legacy Java and XML apps to Kotlin, Jetpack Compose, and a layered architecture, without disrupting live users or releases.

Key Deliverables
Migration plan and roadmap
Java to Kotlin conversion
XML to Compose migration
Test coverage for refactored code
KotlinComposeRefactoringJUnit
Discuss Android Requirements
Specialized

Bug Fixing, App Maintenance & Play Store Publishing

Fix crashes, update your app, get it live

Fixing crashes, UI glitches, and build errors in existing Android apps, updating them for the latest Android versions, and handling Play Store release and policy rejections so your app goes live without delays.

Key Deliverables
Crash and bug fixes with a root-cause summary
Android version and SDK updates
Signed release build (AAB)
Play Console setup and rejection fixes
Android ProfilerBaseline ProfilesCrashlytics
Discuss Android Requirements
Engineering Discipline

Clean Architecture & Engineering Philosophy

How I structure Android applications to be testable, maintainable, resilient to network drops, and scalable for distributed teams.

Layer 01

Presentation & UI

Built with Jetpack Compose & Material Design 3, using unidirectional data flow, MVVM architecture, and StateFlow for reactive UI state management.

Jetpack ComposeStateFlowMaterial 3
Layer 02

Domain & Business Logic

A pure Kotlin module with no Android dependencies. Encapsulates business rules, validation, payment orchestration, use cases following SOLID principles and separation of concerns.

Use CasesSOLID PrinciplesPure Kotlin
Layer 03

Data & Infrastructure

Handles data access through repository implementations, Room for local persistence, and Retrofit for remote API communication.

Room DBWorkManagerRetrofit 2
Production Portfolio

Featured Systems & Applications

Real production systems architected and deliveredβ€”spanning government crowd management, multi-tenant e-commerce, and high-density utilities.

SAR / YamamaCM Hajj Platform
SAR / YamamaCM Hajj Platform
Enterprise
Wulooj / Saudi Ministry of Transport (SAR)

SAR / YamamaCM Hajj Platform

Role-Based Field Attendance & Candidate Duty Platform (Hajj 25/26)

Enterprise-grade field operation suite engineered for the Saudi Ministry of Transport and Saudi Arabian Railways (SAR). Deployed across Mina, Arafat, and Muzdalifah to track candidate attendance, verify train crew assignments, manage crowd controllers, and report track station hazards in real time.

Crash-Free Rate
99.99%
Offline Sync Latency
<100ms
KotlinRoom DB (Offline-First)Coroutines & FlowHilt+3
5 SaaS Mobile Ecosystems
5 SaaS Mobile Ecosystems
SaaS & E-Commerce
Wulooj Enterprise Clients

5 SaaS Mobile Ecosystems

End-to-End E-Commerce, Food & Beverage, and B2C Apps on Google Play

Developed and delivered five native Android applications for SaaS platforms across e-commerce, food ordering, loyalty programs, and digital payments, serving businesses across Saudi Arabia

Google Play Rating
4.7 / 5.0
Payment Success Rate
99.8%
KotlinJetpack ComposeCheckout.com Flow SDKTap Payments+2
Edge Lighting & Live Border Effects
Edge Lighting & Live Border Effects
Media & Utilities
Funsol Technologies Pvt Ltd

Edge Lighting & Live Border Effects

Hardware-Accelerated Canvas Rendering & Custom Android Overlays

A feature rich Android app for personalized screen aesthetics through dynamic edge lighting and immersive visual effects. Features custom shader rendering and adaptive notch calculations alongside animated particle borders and ambient lighting modes for a polished display experience.

Render Frame Rate
60 FPS steady
Memory Footprint
<45 MB
KotlinForeground ServicesCustom Views and CanvasAndroid Graphics and Shader APIs+1
All-In-One Toolbox
All-In-One Toolbox
System Tools
ShareHands

All-In-One Toolbox

50+ Specialized Device Tools Packaged in Under 15MB

A versatile Android utility suite bringing essential everyday tools into one lightweight app, from compass navigation and sound measurement to sensor diagnostics, flashlight effects, QR scanning, unit conversions, and anti-theft protection.

App Size
<15 MB
Supported Tools
50+ Tools
KotlinSensorManager APIAudioRecord APICameraX and ML Kit for QR scanning
Audiobook
Audiobook
Tools
Funsol Technologies Pvt Ltd

Audiobook

Enterprise Mobile Application

A feature rich audiobook platform designed for seamless listening with personalized playback controls, organized audio libraries, background playback, and an intuitive listening experience.

Crash-Free
99.99%
KotlinCoroutinesRoomMedia3 ExoPlayer+1
5+ Years Career Progression

Professional Experience & Track Record

A track record of engineering leadership, production stability, and collaborating with cross-functional product teams across Saudi Arabia, Egypt, India, and Pakistan.

Apr 2025 - Present99.99% Crash-Free

Senior Android Engineer

Wuloojβ€’Riyadh, Saudi Arabia (Remote)

Core Android Engineer driving mission-critical transportation software for the Saudi Ministry of Transport alongside enterprise multi-tenant SaaS e-commerce ecosystems across GCC.

Developed 5 SaaS Android apps for e-commerce, food ordering, F&B and B2C businesses, from requirements to Google Play releases.
Integrated 120+ REST APIs using Retrofit and OkHttp in a single food-chain app, powering multi-branch browsing, categories, cart, multi-step checkout, order tracking and history, loyalty, rewards, wallet with send credit, gift cards and booking features.
Integrated Checkout.com and Tap Payments SDKs for secure in-app payments, with tokenized sessions, transaction validation and payment-failure handling.
Developed SAR/YamamaCM for the Saudi Ministry of Transport, an offline-first Hajj 2025–2026 workforce app using Room with automatic sync to manage attendance, duty stations, sessions, leave and meals.
Collaborated with business, product, backend, UI/UX and QA teams across Saudi Arabia, Egypt and India to turn specifications and designs into tested production releases.
KotlinJetpack ComposeCoroutines & FlowRoom DB (Offline-First)Hilt / DaggerCheckout.com SDKTap PaymentsClean ArchitectureANR OptimizationMVVM
Mar 2024 – Mar 2025

Android Engineer

Funsol Technologies Pvt Ltd

Improved Android app stability and maintainability through Clean Architecture, MVVM, modularization, and performance optimization.

Sep 2023 – Mar 2024

Android Developer

Join App Studio

Developed feature-rich Android applications, focusing on performance optimization, local data persistence, and automated testing.

Feb 2021 - Apr 20241M+ App Installs

Android Engineer

ShareHands

Developed and published consumer Android applications on Google Play, building responsive UIs and optimizing app performance across devices.

Technical Mastery

Core Competencies & Stack

A comprehensive breakdown of frameworks, platforms, and methodologies battle-tested in high-traffic production environments.

Architecture & Core

Foundational software design principles, concurrency, and modular architecture patterns.

Clean ArchitectureCore95%
Kotlin Coroutines & FlowCore90%
MVVM PatternsCore95%
Hilt & Dagger DICore92%
Multi-Module Projects85%
SOLID & Design Patterns85%

UI & Modern Frameworks

Next-generation declarative UI development alongside battle-tested native Android frameworks.

Jetpack ComposeCore84%
Material Design 386%
Android SDK & FrameworkCore95%
Custom Canvas & 2D Rendering88%
XML Layouts & ViewBinding98%
MotionLayout & Animations90%

Database & Storage

Mission-critical local persistence, offline caching, and reactive query streams.

Room DatabaseCore98%
Offline-First Sync EnginesCore96%
DataStore Preferences94%
Encrypted Storage (AES-256)95%
SQLite Optimization88%

Performance & Profiling

Ensuring 99.99% crash-free stability, eliminating ANRs, and boosting cold starts.

ANR Diagnostics & EliminationCore94%
Android Studio ProfilerCore90%
Memory Leaks & LeakCanary90%
Startup Time Optimization88%
Battery Optimization92%

Testing & Quality

Unit testing, mocking, automated code verification, and defensive coding.

JUnit Core90%
MockK & MockitoCore90%
Turbine (Flow Testing)84%
Firebase CrashlyticsCore94%
ProGuard / R8 Rules96%

SDKs & Integrations

Payments, maps, background workers, and RESTful cloud API architectures.

Checkout.com Flow SDKCore92%
Tap Payments SDKCore84%
WorkManager & Services90%
Retrofit 2 & OkHttp Core96%
Firebase Cloud Messaging96%
CameraX API88%
Academic Background

Education

Solid theoretical foundation combined with years of battle-tested production engineering.

2024 - Present (Evening / In Progress)

Master of Science in Computer Science (MS CS)

National University of Sciences and Technology (NUST)

Advanced research in distributed systems, mobile algorithm optimization, and high-performance software architectures while maintaining full-time senior engineering responsibilities.

2017 - 2021

Bachelor of Science in Computer Science (BS CS)

COMSATS University Islamabad

Comprehensive core curriculum encompassing Data Structures & Algorithms, Object-Oriented Software Engineering, Operating Systems, Database Systems, and Mobile Application Development.

Ready to Connect

Let's Build Something Exceptional

Open to Senior Android Engineer opportunities worldwide, with remote availability and flexible working hours across global time zones.

Contact Channels

Phone / WhatsApp
+92 311 9069464
Timezone Compatibility

Based in Islamabad (UTC+5), with flexible hours for collaboration across GCC, Asia, Europe, and North America.

View CV (PDF)

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HA
Hammad Ahmed
Senior Android Engineer

Senior Android Engineer with 5+ years of experience building native Android apps in Kotlin and Jetpack Compose, with a focus on Clean Architecture, modular design and production stability. Built five SaaS e-commerce, food-ordering and B2C apps with in-app payments through Checkout.com, and SAR/YamamaCM, an offline-first workforce management app for the Saudi Ministry of Transport used during Hajj 2025 and 2026. Results include 99.99% crash-free sessions, ~90% fewer ANRs and ~50% faster cold start. Works with teams across Saudi Arabia, Egypt and India.

Open to full time opportunities in Pakistan, GCC, Europe, and worldwide remote roles.

Get in Touch

Islamabad, Pakistan

Β© 2026 Hammad Ahmed. All rights reserved.
Senior Android Engineer Portfolio