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Usman Khan
@usmannisarkhan
Level 2
Mobile Application Developer
Pakistan
French, English
About me
Hi, I’m Usman an experienced Android app developer with 5+ years of expertise in Java and Kotlin. I have worked on utility apps with 200M+ global downloads, including QR scanners, PDF scanners, camera apps, and GPS/location-based apps. I specialize in creating custom Android applications with modern UI/UX, smooth performance, and bug-free code. From Firebase, APIs, Ads, and In-App Purchases to Google Maps and authentication systems, I deliver high-quality, scalable mobile apps.
Feel free to contact me for services.
Skills
Usman Khan
$20/hour
Offline •
Average response time: 1 hour
See my services
Android App Development
I will develop your android app or be your android app developer
Mobile App Customization
I will integrate admob ads and facebook ads in your android app
Want to work on an hourly basis?
Tell Usman Khan what you need.
$20
/
hourPortfolio
Work experience
Mobile Application Developer
9D Technologies • Full-time
Oct 2024 - Aug 2025 • 10 mos
• Architected in-app billing and ad mediation for 50+ apps, driving a 30% increase in total revenue. • Engineered reusable billing and advertising SDKs, significantly reducing integration time company-wide. • Managed large-scale updates and performance tuning for high-traffic applications totaling 200M+ downloads. • Mentored junior developers and spearheaded code reviews to ensure adherence to Clean Architecture.
Mobile Application Developer
Innovative Inside • Full-time
May 2024 - Oct 2024 • 5 mos
• Led full-cycle Android development utilizing Kotlin, Jetpack, MVVM and Clean Architecture. • Improved app ratings from 3.8 to 4.6+ by identifying and resolving performance bottlenecks and enhancing the UX. • Successfully published 5+ applications maintaining an average user rating of 4.5+.
Mobile Application Developer
9D Technologies • Full-time
Feb 2023 - May 2024 • 1 yr 3 mos
• Developed complex mobile features using MVVM, Clean Architecture, and CameraX. • Boosted daily user retention by 35% through targeted feature updates and performance optimizations. • Integrated Firebase suite (Analytics, Crashlytics, Performance, Remote Config) to monitor and enhance app stability and responsiveness.
208 Reviews
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Rating Breakdown
- Seller communication level
- Quality of delivery
- Value of delivery
1-5 out of 208 Reviews
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mdp_sr
United States
Exceptional work and he made sure we were on the same page as what was needed, and worked with me on the app development as needed and I am truly impressed with the speed and quality of work! Excellence! and recommend for your AD mob project for your google play app development.
Helpful?
pdelaunay78
Repeat Client
France
Rapidité, professionalisme, connaissance du codage permettant d'aller plus rapidement droit au résultat
Helpful?
ezbzsolutions
United Kingdom
Thank you Usman for your great piece of work, highly recommended
Helpful?
usmanmehmood527
Pakistan
Excellent communication and a deep understanding of the project requirements. The freelancer was very patient with revisions and ensured everything was perfect. I will definitely hire again!
Helpful?
mrmohdr
United Arab Emirates
Thanks for the work. I definitely recommend working with the freelancer.
Helpful?
