Senior Mobile Engineer

Hamza Zafar

Senior React Native Developer | Full Stack Mobile Engineer

Building Scalable Apps, One Commit at a Time

Senior React Native Developer & Full Stack Mobile Engineer. 6+ years building iOS and Android apps with React Native, TypeScript, and Node.js. 50+ production apps shipped focused on performance, clean architecture, and on-time delivery.

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Hamza Zafar
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Experience

Experience

Results-driven Full Stack Mobile Engineer with 6+ years of experience building high-performance cross-platform iOS and Android apps using React Native. Delivered 50+ production applications, improving stability by 70%+ and reducing load times by 50%+. Specialized in TypeScript, Redux/Zustand, Firebase/Supabase, and scalable backend systems (Node.js/NestJS, GraphQL). Proven track record of leading teams, maintaining 60 FPS performance, and shipping pixel-perfect, production-ready applications in fast-paced Agile environments.

SitePod

Senior Mobile App Developer

SitePod

Oct 2024 – Oct 2025

USA (Remote)

  • Spearheaded complete mobile UI redesign in a high-pressure 5-day sprint using React Native + Tailwind, maintaining consistent 60 FPS performance across devices and boosting user satisfaction scores by 90%.
  • Engineered Firebase deep linking, dynamic push notifications, and real-time analytics integrations, driving 25% higher active user engagement and retention metrics.
  • Diagnosed and eliminated critical performance bottlenecks through code profiling and optimization (code-splitting, memoization), resulting in significantly improved app responsiveness and zero major crashes post-launch.
D12 Solutions

Full Stack Mobile App Developer

D12 Solutions

Feb 2023 – Oct 2024

Pakistan

Jeux Developers

Mobile App Developer

Jeux Developers

Jul 2022 – Jan 2023

Pakistan

Capabilities

Skills

Cross-platform mobile development, MERN stack, and end-to-end product delivery from architecture to App Store deployment.

Mobile & Frontend

React NativeExpoTypeScriptReact.jsNext.jsReduxZustandContext APITailwind CSSReact Navigation

Backend & Integrations

Node.jsNestJSExpress.jsGraphQLREST APIsFirebaseSupabaseMongoDBSQLWebSocketsStripeIn-App PurchasesOpenAI / GenAIClarifaiPush NotificationsBluetooth / Smart Devices

Tools & DevOps

AWSVercelNetlifyGitCI/CDJestSentryXcodeAndroid StudioJiraFastlane

Other

Performance OptimizationUnit / E2E TestingApp Store & Play DeploymentAccessibilityAgile / ScrumTechnical LeadershipCode Review & Mentoring

Selected Work

Projects

Production mobile apps and web products built with React Native and a modern full-stack toolchain.

Mobile Apps

Loading live store stats and ranking by downloads and rating.

Aheev Performance

Acheev empowers athletes with cutting-edge performance tracking and personalized training insights, optimizing their journey to peak fitness.

GraphQLReact & React NativeNode JSFirebase

Barcelona Guide

Unlock Barcelona's treasures with our comprehensive travel guide app. Explore attractions, historic sights, and travel details seamlessly in one place.

React & React NativeJavaScriptPHPFirebase

ClearPast: AI Photo Enhancer

Turn blurry, low-quality photos into stunning high-resolution images instantly using powerful AI enhancement.

React & React NativeTypeScriptAI / ML

CRBO Inc.

A taxi App where people can rent thier cars with drivers for short and Long Trips. If Sign Up as a User, people can use this Uber like service

React & React NativeFirebaseJavaScriptStripe

Dialed Resistance

An IoT-powered fitness app that connects with a resistance monitor to bring smart resistance tracking to standard spin bikes.

AndroidJavaOneSignalIn-App Purchases

FMHero

Mobile HVAC documentation tool built by techs — cut paperwork time in half, stay compliant, and keep service records for life.

React & React NativeTypeScriptFirebase

Glowvia: AI Glow Up

AI glow-up coach with a personalized Glow Score, 30-day plans, and tools to optimize skin, face, hair, and style.

React & React NativeTypeScriptAI / ML

Goal'in

100% free sports predictions app with challenges, rankings, and rewards for football fans.

React & React NativeJavaScriptFirebase

ICR - IT Centre RYK

ICR provides a cutting-edge learning environment, offering hands-on experience and skills development for success in the evolving IT industry.

JavaScriptLaravelReact & React NativeOneSignal

Kohinoor Bazar

A digital presence for Kohinoor Bazar, an international grocery store in Budapest offering authentic South Asian, Middle Eastern, and global food products.

React & React NativeTypeScriptFirebaseNode JS

Luxurian KW

Your Gateway to Luxury Bags and Accessories Step into a world of opulence with LUXURIAN, the premier app designed exclusively for those who appreciate luxury.

React & React NativeCodeigniterOneSignal

Mangia Rewards | Dining Offers

Introducing Mangia Rewards: Explore local restaurants and get a free drink, appetizer, or dessert with every entree purchase, 7 days a week.

React & React NativeFirebaseJavaScriptStripe

Social Proof

Testimonials

What clients say about working together.

richard2022

Morocco
Third project with Hamza and same quality.

lorie_nelson

United States
I don't know why this developer has 4.9 stars. He should have 5.0 1000%. Fluid in English, fixes bugs instantly, goes above and beyond, understands coding issues very clearly, is very precise when issuing a fix, first developer that impressed me on Fiverr and I've worked with several. He's my new software developer and I already trust his expertise in anything I could throw at him. Will order from him again and again.

leonard1333

Germany
Thanks Hamza :) He fixed a Bug for me which I couldnt fix myself for 3 Days. He did found a good solution within hours.

kevin_dv

India
Amazing work, will definitely hire him again. Don't think hire him, you won't regret.

brendanciccone

United States
Hamza built a flawless React Native mobile app 1:1 to the designs I created in Figma, with all the requested APIs I wanted. On top of building exactly what I envisioned, he thought ahead of me and added some tasteful touches to the app that only made it even better, from animations to action sheets to toasts. He was accommodating to changes, understood all requirements of the project, and even suggested a few things that definitely saved us from several headaches. I will definitely hire him again in the future, and if you're in the market to have someone work on or create a React Native mobile app, this is THE developer to hire. Code was also really clean and bug-free.
Review 1 / 2

alexpaczeika

Romania
Hamza Dev did an AMAZING job with my mobile app development. The attention to detail and professionalism resulted in a flawless, bug-free product. Working with Hamza was a breeze, thanks to his politeness, timely delivery, and excellent cooperation!

gillinger

Sweden
Hamza Dev truly impressed me with his EXCEEDING expectations in mobile app development. His attention to detail and professionalism were outstanding, making our collaboration smooth and efficient. Working with him was a pleasure, thanks to his prompt delivery and excellent communication skills.

ajfelix1

United States
Never disappoints!

ermirlatifi

North Macedonia
Excellent work! Hamza quickly solved my problem with outstanding expertise. Highly responsive and delivered everything on time. Highly recommend!

Foundation

Education

Academic background and continuous learning.

SSEC
Khawaja Fareed University of Engineering and Information Technology

Bachelors in Software Engineering

  • My academic journey includes in-depth studies of core subjects like Data Structures, Database Management Systems (DBMS), Security, and Software Engineering.
  • Complementing this, I've successfully completed various courses focusing on Backend, Web, and Mobile App Development
  • Applying the knowledge gained from my Software Engineering course, I've successfully implemented several projects showcasing practical application of these concepts

Impact

Highlights

Key metrics and achievements from real production work.

50+

Production apps

70%

Stability improvement

50%

Faster load times

6+

Years experience

60 FPS

Target performance