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Programming & Development Apps & Mobile

Mobile App Dev | iOS, Android, Flutter

$25/hr Starting at $1K

  • Build Powerful, User-Friendly Mobile Apps that Scale


At 20thFloor Technologies, we design and develop high-quality mobile applications that help startups, enterprises, and entrepreneurs capture their audience with seamless experiences across iOS and Android. From MVP prototypes to enterprise-grade apps, we ensure speed, performance, and business impact.

What we deliver:

✔ Cross-Platform Development – Fast, cost-efficient apps using Flutter and React Native.
✔ Native App Development – High-performance apps for iOS (Swift) and Android (Kotlin/Java).
✔ MVP Builds – Lean mobile apps that validate ideas quickly with early adopters.
✔ Backend & API Integration – Secure connectivity with CRMs, SaaS, and third-party APIs.
✔ Cloud-Connected Apps – AWS, Firebase, or Azure-powered mobile apps with push notifications.
✔ UI/UX Design – Wireframes, clickable prototypes, and user-tested interfaces for maximum engagement.
✔ App Store/Play Store Submission – End-to-end publishing and compliance support.
✔ Ongoing Support & Scaling – Continuous improvement, feature expansion, and performance tuning.

Why clients select us:

  • Startup & Enterprise Experience – Delivered apps across fintech, e-commerce, healthcare, and education.
  • Faster Time-to-Market – Agile delivery with weekly demos and milestone tracking.
  • Quality & Performance – Code reviews, testing pipelines, and scalability-first architecture.
  • Business-Oriented Approach – Apps designed not just for users, but for growth, retention, and ROI.
  • End-to-End Partner – From concept → design → development → launch → maintenance.


Skills & Expertises:

  • Mobile App Development

  • iOS App Development (Swift, Objective-C)

  • Android App Development (Kotlin, Java)

  • Cross-Platform Apps (Flutter, React Native)

  • MVP App Development

  • App Store & Play Store Submission

  • UI/UX for Mobile (Figma, Wireframes, Prototyping)

  • API Integration & Backend Connectivity

  • Push Notifications & In-App Messaging

  • Payment Gateway Integration

  • Cloud-Connected Mobile Apps (AWS, Firebase, Azure)

  • Mobile App Maintenance & Scaling


👉 Whether you need a cross-platform MVP, a native iOS/Android app, or an enterprise-scale mobile solution, we deliver apps that combine usability, performance, and impact.

About

$25/hr Ongoing

Download Resume

  • Build Powerful, User-Friendly Mobile Apps that Scale


At 20thFloor Technologies, we design and develop high-quality mobile applications that help startups, enterprises, and entrepreneurs capture their audience with seamless experiences across iOS and Android. From MVP prototypes to enterprise-grade apps, we ensure speed, performance, and business impact.

What we deliver:

✔ Cross-Platform Development – Fast, cost-efficient apps using Flutter and React Native.
✔ Native App Development – High-performance apps for iOS (Swift) and Android (Kotlin/Java).
✔ MVP Builds – Lean mobile apps that validate ideas quickly with early adopters.
✔ Backend & API Integration – Secure connectivity with CRMs, SaaS, and third-party APIs.
✔ Cloud-Connected Apps – AWS, Firebase, or Azure-powered mobile apps with push notifications.
✔ UI/UX Design – Wireframes, clickable prototypes, and user-tested interfaces for maximum engagement.
✔ App Store/Play Store Submission – End-to-end publishing and compliance support.
✔ Ongoing Support & Scaling – Continuous improvement, feature expansion, and performance tuning.

Why clients select us:

  • Startup & Enterprise Experience – Delivered apps across fintech, e-commerce, healthcare, and education.
  • Faster Time-to-Market – Agile delivery with weekly demos and milestone tracking.
  • Quality & Performance – Code reviews, testing pipelines, and scalability-first architecture.
  • Business-Oriented Approach – Apps designed not just for users, but for growth, retention, and ROI.
  • End-to-End Partner – From concept → design → development → launch → maintenance.


Skills & Expertises:

  • Mobile App Development

  • iOS App Development (Swift, Objective-C)

  • Android App Development (Kotlin, Java)

  • Cross-Platform Apps (Flutter, React Native)

  • MVP App Development

  • App Store & Play Store Submission

  • UI/UX for Mobile (Figma, Wireframes, Prototyping)

  • API Integration & Backend Connectivity

  • Push Notifications & In-App Messaging

  • Payment Gateway Integration

  • Cloud-Connected Mobile Apps (AWS, Firebase, Azure)

  • Mobile App Maintenance & Scaling


👉 Whether you need a cross-platform MVP, a native iOS/Android app, or an enterprise-scale mobile solution, we deliver apps that combine usability, performance, and impact.

Skills & Expertise

.NETAndroid App DevelopmentAndroid DevelopmentAndroid ProgrammingApp DevelopmentBusiness Android AppsCross Platform App DevelopmentHybrid Mobile ApplicationsiOS App DevelopmentiOS DevelopmentiOS Programmingipad DesignIpad DevelopmentIphone App DevelopmentIphone Application DevelopmentIphone DesignIphone DevelopmentIphone SdkJavaMobile App DevelopmentMobile Application DesignMobile Application DevelopmentMobile DevelopmentMvpSwift

3 Reviews

  • Matiang 2

    Matiang 2 says,

    Excellent job! Couldn't have done it without the help. Very polite and easy to work with. And communication is outstanding, daily and on point to the project objectives. He knows exactly what he does. I will hire him again

    for Css fix job for 20thfloor on Apr 06, 2020

  • Hu 6

    Hu 6 says,

    Wow. This guy is tops in this platform. We thought this issue would take days to fix. This expert dug in, got to work, and pumped out a fixed solution within hours. We are SO pleased, relieved, and ready to do more work with this awesome programmer! Excellent job! Couldn't have done it without the help. Very polite and easy to work with. And communication is outstanding, daily and on point to the project objectives. He knows exactly what he does. I will hire him again and highly recommend anyone to hire him for his great skills and good communication! Will use again. FIVE STARS!! TEN STARS!!

    for CSS fixing on Mar 19, 2020

  • Ofer 5

    Ofer 5 says,

    Good quality, good communication, will do the job and will not run away. trustable.

    for Delivery System on May 20, 2016