Turn your idea into a working application - from internal systems and SaaS platforms to mobile apps.
Application Development
We design and develop custom applications, SaaS platforms, internal systems and mobile apps for businesses - from idea and prototype to a production-ready solution.
Application development tailored to your business
Fastdev provides custom software development for companies looking to turn ideas and business needs into working applications. We build internal systems, SaaS platforms and mobile apps, either from scratch or by developing an existing product further.
Every project starts the same way: understanding the actual problem the application needs to solve, not just the feature list. When it's useful, we build a clickable prototype first, so functionality and user experience can be tested before development begins. Problems are much easier and cheaper to fix in a prototype than once development is underway.
Our target is a first version in production within six weeks. That's deliberate: real users testing something real this early tells you more than another month of internal debate ever will.
We've been building software since 2007, from our base in Stockholm - experience that helps us spot potential problems early and make better technical decisions from the start.
Three types of applications we build
Internal systems and business applications We develop custom systems that digitalise processes and improve workflows - from administrative systems and customer portals to booking solutions and other business-critical applications. We can integrate the application with your existing systems and external services, so it becomes part of a connected workflow rather than another standalone tool.
SaaS development We build SaaS platforms on a technical foundation designed to hold up as you add users, features and integrations - not just to work at launch. Depending on what the product needs, we can handle frontend and backend development, APIs, integrations and admin interfaces, together or separately.
Mobile app development for iOS and Android We develop mobile apps for iOS and Android, using native or cross-platform development depending on what makes the most sense for the project. We can handle the full application - from UI and the mobile app itself to APIs, backend systems, integrations and admin interfaces.
How our application development process works
1. Requirements and goals We start by understanding your business, your users and the problem worth solving. Together, we define what the first version actually needs to do - and, just as importantly, what it doesn't.
2. Prototype When it's useful, we build a clickable prototype so workflows, functionality and user experience can be tested before development begins. It's cheaper to change a prototype than shipped code.
3. Development We work iteratively and build the functionality that creates the most value first. The goal throughout is simple: get something real in front of real users as quickly as we responsibly can.
4. Launch Our target is to have the first version in production within six weeks of development starting. Real usage tells you more about what to build next than months of planning based on assumptions.
Built to evolve
Good custom software development isn't just about getting an application to work on launch day. It should stay easy to build on as your business, technology and users' needs change six months or three years later.
That's why we care about structure and architecture from day one. A well-built codebase is easier to test, maintain and extend when it's time to add the next feature or integration.
Read how we build maintainable mobile apps using MVVM and Clean Architecture
Expertise when the project needs it
Building an application often requires different expertise at different stages. We bring in the right technical and design skills as the project develops, from architecture and backend development to frontend, mobile development and UI/UX.
Already have a product and just need additional developers in your existing team? Explore our software developers and IT consultants
After launch
Launching the application doesn't have to be the end of the project. We can continue supporting, maintaining and developing it as new requirements emerge - or hand it over cleanly to your own team.
You can work with Fastdev throughout the application's lifecycle or only for the stages where you need us.
Frequently asked questions about application development
How long does it take to develop an application?
Our target is a first version in production within six weeks of development starting. This gets the application into the hands of real users sooner and lets further development be guided by actual feedback rather than assumptions.
How much does application development cost?
The cost depends on the scope of the application, required integrations and the team needed to deliver it. After an initial conversation, we can give you a concrete estimate based on your project.
Who owns the code and intellectual property after the project?
You do - full stop. That's true whether you take over maintenance internally afterwards or keep working with us.
Do we need a prototype before development starts?
Not always. When it's useful, we build a clickable prototype so workflows and user experience can be tested before development begins. This reduces the risk of expensive changes later.
Can you take over and develop an application we already have?
Yes. We regularly work with existing systems and applications - adding new functionality, improving what's already there and integrating them with external services.
What technologies do you use?
We choose the technology based on what the application needs in terms of performance, maintainability and scalability rather than using the same stack for every project. In practice, this commonly includes technologies such as React, .NET, Node and native iOS/Android, depending on the project.
Have an application you want to build?
Whether you have a new idea you want to turn into a working product or an existing application that needs further development, tell us what you're building and we'll help you figure out the right approach.