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App369 is one senior Flutter developer, Simon Dziak, working to a fixed scope at listed prices. He builds and fixes Flutter apps for iOS, Android and web from one Dart codebase, with Firebase behind them, from Miami. It's the stack he uses to build and run Workspace369.

Fixed prices

All fixed-price offers

Something else? Describe your project

How to hire

Ways to hire a Flutter developer

Pick the route that matches what you have now. Every price below is the listed price; nothing is billed by the hour.

  • One bug fixed in a Flutter app you already have

    App Fix Ticket

    Price: $450 diagnosis, credited toward the $1,200 fix

    Timing: 3 business days for the diagnosis, then 5 for the fix

  • Ongoing work on a Flutter app you already have

    Monthly Dev Subscription

    Price: from $1,495/month

    Timing: Most requests back in about 2 business days. Pause or cancel anytime.

  • A new Flutter app for iOS and Android

    Written scoping, then a fixed quote

    Price: Quoted in writing after the scoping

    Timing: Dates are in the quote

  • An app built in FlutterFlow that needs a developer

    Hire a FlutterFlow developer

    Price: $450 diagnosis, credited toward the $1,200 fix

    Timing: Needs the exported code; the diagnosis takes 3 business days

  • A first version built as a web app

    Web App MVP Sprint (Vue/Nuxt or React)

    Price: from $6,000, after a $450 scoping

    Timing: About 4 weeks from the signed quote

What you get

  • One developer, Simon, from the scope to the release.
  • A written scope and a fixed price before any work starts.
  • Code as pull requests to your own repository, with a note on what changed and how it was tested.
  • A regression test with every bug fix.

What isn't included

  • New features inside a bug-fix ticket
  • Guaranteed App Store or Google Play approval
  • Your hosting, Firebase, Stripe or AI bills
  • More than one request in progress at a time on the monthly plan
  • Calls, except paid consultations ($100 per 15 minutes, paid upfront)

What Simon builds

Flutter Development Services

01

Cross-Platform App Development

Build one Flutter codebase that deploys to iOS, Android, web and desktop. Flutter compiles to native machine code on mobile and draws its own UI, so screens look and behave the same on every platform without a second team.

02

Widget-Based UI Development

Flutter's composable widget system enables pixel-perfect, brand-consistent interfaces across platforms. Simon builds custom widget libraries, complex animations, and adaptive layouts that follow Material Design 3 and Cupertino guidelines simultaneously.

03

Firebase Integration

Full backend integration with Firebase including Firestore real-time database, Authentication, Cloud Functions, Cloud Messaging for push notifications, and Crashlytics for monitoring.

04

State Management & Architecture

Scalable app architecture using Riverpod or BLoC patterns with clean architecture principles. This approach keeps the code testable and maintainable as it grows from MVP to enterprise, without rewrites.

05

Custom Animations & Motion Design

Flutter's Impeller renderer, the default on iOS and on Android API 29+ since Flutter 3.27, precompiles shaders so animations don't stutter on first run. Simon builds custom implicit and explicit animations, hero transitions, and micro-interactions that improve user experience beyond what standard native development offers.

06

Plugin & Package Development

When existing packages don't meet requirements, Simon builds custom Flutter plugins using platform channels to access native iOS and Android APIs directly. These plugins integrate with device hardware including cameras, Bluetooth, NFC, and biometric sensors.

How it works

The process

  1. Discovery & Requirements

    Simon analyzes your business goals, target platforms, and feature requirements to define the Flutter project architecture, select the right state management approach, and create a detailed development roadmap.

  2. UI/UX Design & Prototyping

    Simon designs platform-adaptive interfaces in Figma that follow both Material Design 3 and Cupertino guidelines, validated through interactive prototypes and user testing.

  3. Flutter Development

    Simon builds your app using clean architecture patterns, custom widget libraries, and Firebase integration, with CI/CD pipelines from day one for continuous delivery.

  4. Testing & Quality Assurance

    Comprehensive testing including unit tests, widget tests, and integration tests using Flutter's built-in testing framework. Simon tests across multiple device sizes and OS versions.

  5. App Store Deployment

    Simon handles submission to both Apple App Store and Google Play Store from the single Flutter codebase, configure beta testing tracks, and optimize store listings for ASO.

  6. Maintenance & Iteration

    Ongoing support including Flutter SDK upgrades, dependency updates, performance monitoring via Firebase Crashlytics, bug fixes, and feature iterations based on user analytics.

Showcase

Apps built with Flutter

Flutter isn't a niche choice. Google's own Flutter showcase lists production apps such as:

  • Google Pay: Google's payments app
  • NotebookLM: Google's AI research notebook
  • Toyota: in-vehicle infotainment
  • SoFi: a finance super app
  • Headspace: mental health and meditation
  • MGM Resorts: the guest app
  • LG Electronics: parts of webOS
  • Universal Studios: next-generation experiences

Built by Simon

Workspace369

A client-work platform (CRM, proposals, invoicing, payments, scheduling, inbox and AI) built by App369's founder, Simon Dziak. One Flutter codebase with iOS, Android, web and desktop targets; GetX for state and routing; Firebase Auth, Firestore, Storage, Cloud Messaging, Crashlytics and App Check; Stripe for payments. The backend is TypeScript on Cloud Functions (2nd gen), split into 24 separately deployed Firebase codebases.

See it on the App Store (published by Workspace369 LLC) or read the Workspace369 case study. For more examples, see these apps built with Flutter.

Technologies

  • Flutter
  • Dart
  • Firebase
  • Google Cloud
  • Riverpod
  • BLoC
  • GetX
  • Stripe

Error fixes

Flutter and Firebase errors Simon fixes

Each page explains the error from the vendors’ own docs, with what to change next.

Questions

Frequently asked questions

How much does a Flutter app cost?

It depends on scope: the number of screens, integrations, admin tools and how much backend work sits behind the app. The free app cost calculator turns those choices into a range with every assumption listed, and the fee structure page shows how projects are priced. One Flutter codebase usually costs less than two separate native apps because the UI and business logic are written once, though platform-specific work such as payments, push notifications and store setup is still done per platform.

Can I hire a Flutter developer in Miami?

Yes. App369 is a founder-led Flutter studio in Miami, Florida, working with clients in South Florida and across the US. You hire Simon for a defined scope rather than by the hour: a written scoping (from $450), then a fixed quote. As a rough estimate, not a quote, version one of an iOS and Android app from one Flutter codebase runs $9,000 to $14,000 before extra features and design. If you already have a Flutter app and need one bug fixed, the App Fix Ticket covers that at a fixed price.

Flutter vs React Native: which is better?

Both are solid. In the 2024 Stack Overflow Developer Survey, 9.4% of all respondents used Flutter and 8.4% used React Native. Flutter draws its own UI with its Impeller renderer and is written in Dart; React Native renders platform-native components and is written in JavaScript or TypeScript, which suits teams that already work in React. Simon builds in Flutter because one codebase covers mobile, web and desktop with the same UI. The Flutter vs React Native comparison goes deeper.

How long does it take to build a Flutter app?

It depends on scope. A focused MVP is measured in weeks to a few months; a full product with payments, admin tools and integrations takes longer. After the brief, Simon sends a milestone plan with dates, and the MVP development page explains how scope gets cut to ship sooner.

Is Flutter suitable for enterprise applications?

Yes. The official Flutter showcase includes Google apps such as Google Pay and NotebookLM, Toyota's infotainment work, SoFi, MGM Resorts and LG's webOS. What makes a Flutter app enterprise-ready is the engineering around it: authentication, offline handling, automated tests, CI/CD and monitoring, which Simon sets up from the first sprint.

Does Flutter support web and desktop apps?

Yes. Flutter's documentation lists Android, iOS, web, Windows, macOS and Linux as supported deployment platforms. Workspace369, which Simon built, keeps all of these targets in one Flutter project.

Can Flutter apps access native device features?

Yes. Flutter talks to native iOS (Swift or Objective-C) and Android (Kotlin or Java) code through platform channels, and pub.dev has packages for the camera, location, Bluetooth, biometrics, push notifications, NFC and more. When no package fits, Simon writes a small platform-channel plugin that calls the native API directly.

Prefer a fixed price?

Fixed scope, fixed price, paid upfront. The work happens in writing; no call needed.

Data and research

Start here

Build Once, Deploy Everywhere

Flutter runs apps from Google, Toyota and LG, and it runs Simon’s own product. Whether you need a startup MVP or a full-scale mobile application, try the free app cost calculator, get a detailed estimate by email, usually within one business day, or book a consultation ($100 per 15 minutes, paid upfront).

Get in touch View pricing

Fiverr reviews / 95 on app work

What buyers said about this kind of work

Read 126 of the 127 reviews
  • “Very detailed and professional. Understands full scope of project before advancing and has honest but critical feedback. such a pleasure with consultation and can't wait to get started.”
    A buyer in the United States, July 2024. Custom order on Fiverr
  • “Had a great consultation with Szymon. He knows his stuff and I have a deeper understanding of how my new mobile app can work.”
    A buyer in the United States, April 2024. Custom order on Fiverr
  • “Great consultation, had many of these types of meetings and definitely understood what nis needed to be done.”
    A buyer in the United States, July 2023. Custom order on Fiverr

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