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StockholmTop App & Web Developers in Stockholm

Software development for Stockholm. We build professional mobile apps and web platforms for the Nordic unicorn factory, home to Spotify, Klarna, and King.

App369 is a founder-led software studio based in Miami, Florida. We build custom mobile apps, web platforms and AI features for businesses in Stockholm 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 · 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

Why App369

Why Stockholm Businesses Choose App369

What Stockholm teams should know before working with App369.

Serving Stockholm, the Nordics, and the Baltics from Europe's unicorn capital, with more billion-dollar startups per capita than any city outside Silicon Valley

Focus on fintech and gaming

GDPR-aware development for Swedish and EU data protection standards, including PSD2 for financial applications

What we build

Software Development Services in Stockholm

From Kista Science City to Södermalm's creative tech district, we build software that matches the ambition and quality of Stockholm's legendary startup ecosystem.

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 Stockholm 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 Stockholm 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 Stockholm 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. Stockholm 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 Stockholm and nationwide.

Start Your Stockholm Project

Get in Touch View Pricing

Fiverr reviews / 95 on app work

What buyers said about working with Simon

All 126 reviews
  • “I highly recommend this developer. He helped me create an amazing application, that is definitely going to help my business generate a lot more income. He is fast, intelligent, and hard-working. Look no further, you found the perfect developer for your project.”
    Mark, United States, March 2022. App development on Fiverr
  • “Thank you again, Simon, for another QUICK and SATISFACTORY delivery! I highly recommend this seller because he is fantastic! I'm also coming back to buy more services. My requests were a bit over the roof, but his understanding of the task is mouthwatering. Once I saw his delivery, I approved it immediately. And he was very responsive while discussing the details.”
    Mark, United States, March 2022. App development on Fiverr
  • “Incredible professional! I am really excited to be working with him on my new application. He will take the time to really understand what your project needs. Simon is the best!”
    Mark, United States, March 2022. Custom order on Fiverr

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