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BostonApp & Custom Software Development in Boston

Software development for Boston. We build innovative mobile apps and websites for New England's top businesses and startups.

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

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A phone standing on a dark grid floor showing a simple map with a light blue location pin
Fiverr
5.0 · 127 reviews
Own product
Workspace369
Fixed-price offers from
$450

Same fixed prices wherever you are

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

FL
Based in Miami, Florida
ET
Eastern Time working hours
Fixed
Price in writing before work starts
1
Codebase for iOS, Android and web

Why App369

Why Boston Businesses Choose App369

What Boston teams should know before working with App369.

Serving Boston, Cambridge, and Greater Boston area

Focus on biotech, healthcare, and education tech

Understanding of Boston's innovation landscape

What Simon builds

Software Development Services in Boston

From Kendall Square to the Seaport, we build software that powers Boston's most innovative companies.

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

The 4-Phase Development Process

A written scope and four clear phases keep Boston 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 the build starts.

  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 Boston 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 App369 offers maintenance that covers bug fixes, iOS and Android OS updates, security patches, dependency upgrades and small feature work, so your Boston app keeps working as the platforms change.

What's your pricing model?

Fixed-price offers are paid in full before work starts, at the prices published on the fixed-price page. Larger builds start with a paid scoping and are then quoted in writing, with their payment schedule, and start only with your yes.

Can you work with existing projects?

Yes. Simon takes over existing codebases, especially Flutter and Firebase apps, for code audits, bug fixes, new features and migrations. Boston 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 Simon integrates 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 App369 takes 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, I serve clients across Boston and nationwide.

Start Your Boston Project

Get in Touch View Pricing

Fiverr reviews / 95 on app work

What buyers said about working with Simon

Read 126 of the 127 reviews
  • “Excellent client service!!! We talked through messaging and placed a modest order to speak on the phone to discuss more detailed details. I'm looking forward to finishing the project's final stages. It comes highly recommended!”
    Dustin, United States, July 2021. Custom order on Fiverr
  • “szymondziak is a very competent developer. Communication was perfect. Will definitely recommend. Thanks for the great job szymondziak”
    A buyer in Germany, June 2021. App development on Fiverr
  • “Very good work on the design. Looking forward to working with Szymon on the app development! Highly recommend!”
    Eric, United States, June 2021. App design on Fiverr

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