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I will build mobile app development app developer flutter react native ai app creation
Jason Hammer
Level 2
4.9
4.9
Gig Summary
About this gig
Premium Mobile App Development | iOS, Android & Flutter
Have a great app idea and need a team that can turn it into a polished, launch-ready product?
I'm Jason, CO-Founder of Onism a product-focused software development agency specializing in high-quality mobile applications.
We build modern iOS and Android apps with a strong focus on UI/UX, performance, scalability, and clean engineering. From MVPs to full-featured applications and website-to-app transformations, we handle the product journey from concept to launch.
What We Build
- iOS & Android Applications
- Flutter & Cross-Platform Apps
- Custom UI/UX Design
- Backend & API Integration
- Web-Based Admin Panels
- App Store & Google Play Deployment
Why Me?
- Founder-Led Quality: Every project receives direct strategic oversight.
- Custom Development: No templates or shortcuts just clean, maintainable code.
- Scalable Architecture: Built with future growth and new features in mind.
- Launch Support: 60 days of post-launch maintenance included.
Whether you're validating an MVP or building your next serious product, well help turn your vision into a mobile experience that looks great, performs reliably, and is built to scale.
Get to know Jason Hammer
Jason Hammer
Building high performance apps that move industries forward
Level 2
- FromPakistan
- Member sinceNov 2019
- Avg. response time1 hour
- Last delivery2 weeks
Languages
English
With 7+ years of experience, I build polished mobile products designed for real-world users and business growth. My work spans food delivery, fitness, social, and e-commerce, including apps featured on TechCrunch, Google Play’s Top 10, and App Store’s “App of the Day”.
I specialize in React Native and Flutter, building fast, scalable iOS and Android apps with clean UX and reliable performance. Whether you’re launching an MVP or scaling an existing product, I focus on one thing: turning your idea into a premium mobile experience that users love.
My Portfolio
Reviews
75 reviews for this Gig
| (73) | ||
| (0) | ||
| (1) | ||
| (1) | ||
| (0) |
Rating Breakdown
- Seller communication level
- Quality of delivery
- Value of delivery
Sort By
Most relevant
S sorrynomike
United States
Ongoing collaborationJason delivered a complete full-stack iOS and Android app, and I could not be happier with him or the entire experience. I came in with an idea, and Jason truly helped me bring that vision to life. He built the whole thing in React Native and Expo with a TypeScript and Redux codebase, stood up a Supabase...
$1,000-$2,500
Price
1 day
Duration
Helpful?S snackooze
United Kingdom
Ongoing collaborationAlways a pleasure working with Jason. He has been extremely helpful in completing the project within the scope and time agreed
$400-$600
Price
8 days
Duration
Helpful?T trellisapps
United States
Excellent experience. Very satisfied with the outcome. Highly recommend Jason’s service.
$1,000-$2,500
Price
3 days
Duration
Helpful?S sorrynomike
United States
Ongoing collaborationCan't go wrong here. Great experience working together.
$100-$200
Price
1 day
Duration
Helpful?S sorrynomike
United States
Ongoing collaborationI've been working with Jason for just about a month. In that time he has delivered four milestones to my exact specifications. I came into this project with no technical background and a build that included React Native, Supabase edge functions, AsyncStorage persistence, RevenueCat paywall integration,...
$1,000-$2,500
Price
1 day
Duration
Helpful?
Reviews
75 reviews for this Gig
| (73) | ||
| (0) | ||
| (1) | ||
| (1) | ||
| (0) |
Rating Breakdown
- Seller communication level
- Quality of delivery
- Value of delivery
Sort By
Most relevant
S sorrynomike
United States
Ongoing collaborationJason delivered a complete full-stack iOS and Android app, and I could not be happier with him or the entire experience. I came in with an idea, and Jason truly helped me bring that vision to life. He built the whole thing in React Native and Expo with a TypeScript and Redux codebase, stood up a Supabase...
$1,000-$2,500
Price
1 day
Duration
Helpful?S snackooze
United Kingdom
Ongoing collaborationAlways a pleasure working with Jason. He has been extremely helpful in completing the project within the scope and time agreed
$400-$600
Price
8 days
Duration
Helpful?T trellisapps
United States
Excellent experience. Very satisfied with the outcome. Highly recommend Jason’s service.
$1,000-$2,500
Price
3 days
Duration
Helpful?S sorrynomike
United States
Ongoing collaborationCan't go wrong here. Great experience working together.
$100-$200
Price
1 day
Duration
Helpful?S sorrynomike
United States
Ongoing collaborationI've been working with Jason for just about a month. In that time he has delivered four milestones to my exact specifications. I came into this project with no technical background and a build that included React Native, Supabase edge functions, AsyncStorage persistence, RevenueCat paywall integration,...
$1,000-$2,500
Price
1 day
Duration
Helpful?
