John F.
FreelancerTop Rated PlusAbout Me
I have 25+ years of experience as a CEO, fractional CTO, technical consultant, and Mobile App Development project leader. I specialize in Android, iOS, and cross-platform apps using Java, Kotlin, Swift, Objective-C, React Native, Flutter, Firebase, MongoDB, TypeScript, AI, EHR, FHIR, HL7, and HIPAA-compliant solutions.
As an experienced Flutter Developer, IOS Developer, and Mobile App specialist, I help clients turn ideas, existing codebases, and best Figma designs into scalable, production-ready products. My focus covers architecture, Mobile App Development, backend systems, QA, deployment, App Store / Google Play release, and long-term support.
Our Agency
Since July 2017, my wife, our talented 55+ team members, and I have been delivering world-class digital solutions.
- 150+ apps delivered across multiple platforms in the last year
- $4M+ turnover on Upwork
- 500+ successful projects and 15,000+ hours worked
- Close to a 100% success rate
- Worked with 7, 8, and 9-figure businesses
- Clients in 50+ countries
- 10+ awards and recognitions
Our Expertise
Mobile App Development
• Android Development using Kotlin and Java
• IOS Developer expertise using Swift and Objective-C
• Cross-platform Mobile App Development using Flutter and React Native
• Backend development with Node.js, Firebase, MongoDB, PostgreSQL
• Cloud deployment, APIs, authentication, payments, AI, GPS, Maps, BLE, WebRTC
• App Store and Google Play deployment
Flutter Developer
As a Flutter Developer, I specialize in high-performance cross-platform applications for iOS and Android. Flutter is one of our strongest technologies, and our Flutter Developer team has delivered hundreds of Mobile App projects.
When you hire a Flutter Developer through SolidAppMaker, you are not relying on one programmer. Our Flutter Developer resources are supported by UI/UX designers, backend engineers, QA specialists, DevOps, and project managers.
IOS Developer
Our IOS Developer team works with Swift, Objective-C, Flutter, React Native, Apple APIs, subscriptions, in-app purchases, push notifications, authentication, HealthKit, third-party APIs, and App Store deployment.
United States#370 / 149,029Top 0.25%
John F. earns an estimated $13k/mo. That's 11× the typical freelancer and more than 99.94% of everyone we track.