John F.

Flutter Developer Mobile App Android Development IOS Developer PM

About 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. We can provide a dedicated IOS Developer, combine an IOS Developer with backend and QA resources, or assign a full Mobile App Development team. Android Development Android Development is another core capability. We build native Android applications using Kotlin and Java and cross-platform applications using Flutter and React Native. Our Android Development work includes architecture, UI implementation, API integrations, payments, subscriptions, Firebase, Maps, GPS, camera features, QR scanning, AI integrations, and Google Play deployment. Our Android Development specialists can work together with an IOS Developer and Flutter Developer when your Mobile App requires both platforms. Web & Full Stack Development • Front-End: React.js, Angular.js, Next.js, HTML5, CSS3, JavaScript, TypeScript • Back-End: Node.js, Laravel, Firebase, MongoDB, PostgreSQL • REST APIs, third-party integrations, AWS, WebRTC • Admin panels, SaaS platforms, marketplaces, dashboards UI/UX Design • Figma, Adobe XD, Photoshop, Sketch • User flows, wireframes, prototypes, design systems • Mobile App interfaces and responsive web applications Why Choose SolidAppMaker? Tailored approach for every project and budget Agile Mobile App Development with milestones and regular updates Dedicated Flutter Developer, IOS Developer, Android Development, backend, design, QA, and DevOps expertise Strong focus on quality, testing, security, and performance Experience taking over existing codebases and improving them Proven experience with MVPs, SaaS, AI, marketplaces, healthcare, fintech, and enterprise applications Highlighted Skills Flutter Developer | Mobile App | IOS Developer | Android Development | Mobile App Development | Flutter | React Native | Swift | Kotlin | Java | React.js | Next.js | Node.js | Firebase | MongoDB | PostgreSQL | AWS | REST APIs | SaaS | AI | ChatGPT | Authentication | EHR | FHIR | HL7 | HIPAA | Stripe | GPS | Maps | BLE | WebRTC | Figma | Agile | Scrum If you need a Flutter Developer, IOS Developer, Android Development specialist, or complete Mobile App Development team, I would be happy to discuss your project. Whether you need a new Mobile App, an existing Mobile App takeover, or ongoing Mobile App Development, our Flutter Developer, IOS Developer, and Android Development specialists can support the full lifecycle. Next Steps Would you be available for a free 30–60 minute consultation? During the meeting, we can review your project goals, technical needs, timeline, budget, and the best Mobile App Development approach. Send me a message through Upwork, and I’ll share my Upwork scheduler so we can arrange a convenient time. Best regards, John H Fijen