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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
$25/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.
$25
/
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.
210 Reviews
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Rating Breakdown
- Seller communication level
- Quality of delivery
- Value of delivery
1-5 out of 210 Reviews
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Most relevant
pdelaunay78
France
Ongoing collaboration
Helpful?
pdelaunay78
France
Ongoing collaboration
Rapidité, professionalisme, connaissance du codage permettant d'aller plus rapidement droit au résultat
5 weeks
Duration
Android App Development
Helpful?
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.
8 days
Duration
Android App Development
Helpful?
ezbzsolutions
United Kingdom
Thank you Usman for your great piece of work, highly recommended
5 weeks
Duration
Mobile App Customization
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!
5 weeks
Duration
Android App Development
Helpful?
