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MiamiTop App & Web Developers in Miami

A South Florida software development company. We build mobile apps and websites for Miami and South Florida businesses.

App369 is a founder-led software studio based in Miami, Florida. We build custom mobile apps, web platforms and AI features for businesses in Miami and beyond, working remotely on Eastern Time.

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Fiverr
5.0 · 126 reviews
Own product
Workspace369
Fixed-price offers from
$450
FL
Based in Miami, Florida
ET
Eastern Time working hours
50/50
Upfront and on delivery
1
Codebase for iOS, Android and web

Our home base

App369 is based in Miami

App369 LLC is a Florida company based in Miami. We work remotely and asynchronously on Eastern Time.

App369 LLC
1000 Biscayne Blvd
Miami, FL 33132
contact@app369.com

Why App369

Why Miami Businesses Choose App369

What Miami teams should know before working with App369.

Serving Miami, Fort Lauderdale, West Palm Beach, and all of South Florida

Understanding of Miami's diverse business landscape

Focus on tourism, real estate, finance, and hospitality sectors

Founder-led team based in Miami, Florida

Nearby Markets

Related Markets Around Miami

Nearby cities and the county hub, for context on neighboring markets.

County Hub

Miami-Dade County

App369 delivers app and web development across Miami-Dade County, Florida. Miami-Dade blends tourism, logistics, international trade, healthcare, real estate, and venture-backed startups that need multilingual, high-velocity digital systems.

What we build

Software Development Services in Miami

Whether you're a Miami Beach startup or a Coral Gables enterprise, we deliver software that helps your business thrive in South Florida's competitive market.

Mobile Apps

iOS and Android apps built with Flutter from one codebase, from concept to App Store launch.

  • iOS & Android
  • Cross-Platform
  • App Store Optimization
  • Maintenance & Updates
from $9k

Web Development

Fast websites and web applications, built for search and for phones first.

  • Custom Design
  • E-Commerce
  • SaaS Applications
  • SEO Optimization
from $6k

Custom Software

Internal tools, integrations and back-office systems engineered around how your team already works.

  • Enterprise Development
  • API Integration
  • Cloud Migration
  • Technical Consulting
from $1.2k

How it works

Our 4-Phase Development Process

A written scope and four clear phases keep Miami projects predictable.

  1. Discovery

    Understanding your vision, goals, and market requirements through stakeholder interviews and competitive analysis.

  2. Design

    Creating clear UI/UX with interactive prototypes you can click through before we build.

  3. Development

    Building with Flutter, Vue.js, Node.js, and GCP using 2-week Agile sprints with weekly milestone reviews.

  4. Launch

    Deployment to production with crash and uptime monitoring and ongoing maintenance.

Technologies

  • Flutter
  • TypeScript
  • Node.js
  • GCP
  • Firebase
  • Vue
  • JavaScript
  • Python

Questions

Frequently Asked Questions

How long does a typical project take?

It depends on scope. As a rough guide, a marketing website takes 4-8 weeks, a web application 2-4 months, and a mobile app 3-6 months. Every Miami project starts with a written scope and milestone plan, so you know the timeline before any build work starts.

Do you provide ongoing support?

Yes. After launch we offer maintenance that covers bug fixes, iOS and Android OS updates, security patches, dependency upgrades and small feature work, so your Miami app keeps working as the platforms change.

What's your pricing model?

App369 uses project-based pricing with a 50/50 payment structure: 50% upfront and 50% on completion. Current ranges are published on our fee structure page, and smaller fixed-price packages are available for well-defined work.

Can you work with existing projects?

Yes. We take over existing codebases, especially Flutter and Firebase apps, for code audits, bug fixes, new features and migrations. Miami businesses with an app that stalled or a developer who left can start with an audit before committing to a larger build.

What technology do you use?

Mostly Flutter for iOS, Android and web apps from one codebase, Firebase and Google Cloud for backends, and Vue/Nuxt for websites. For AI features we integrate large language models for assistants, document extraction and automation.

Simon Dziak - Founder of App369

Your Development Partner

Simon Dziak

As founder of App369, I personally oversee every project we take on, from scoping to launch. I build with Flutter, Firebase and Google Cloud, and I also built and run Workspace369, a client-management platform for freelancers and small businesses. Based in Miami, Florida, we serve clients across Miami and nationwide.

Start Your Miami Project

Get in Touch View Pricing

Fiverr reviews / 95 on app work

What buyers said about working with Simon

All 126 reviews
  • “Szymon is very professional, attentive to detail, and organized with his work. I appreciate the help with my project and I will be looking forward to our continued work together. THANK YOU!!!!”
    A buyer in the United States, January 2022. Custom order on Fiverr
  • “This seller is very responsive and listens to the clients needs. This is my second gig with this seller.”
    A buyer in the United States, December 2021. Custom order on Fiverr
  • “Amazing seller yet again! Looking forward to the next phase of the app development. I'm really excited. It's awesome to have a consultant I can trust!”
    A buyer in the United States, November 2021. Custom order on Fiverr

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