.NET
In short
Custom software is what Sirus was built on. Since 2011, our .NET team - the largest competence team at Sirus - has been designing and developing end-to-end custom solutions: from solid software architecture, backend and frontend development to secure, scalable cloud applications on Microsoft Azure. Whether you want to replace a legacy application, build a new platform from scratch, develop low-code or no-code solutions to optimize internal processes or strengthen your team with experienced .NET consultants, we are here to assist you with our expertise.
Why .NET?
Every organization depends on software, but standard tools rarely fit every process. Meanwhile, many business-critical applications are approaching the end of their lifecycle: they run on outdated technology, are hard to integrate and risky to change. The result? Rising maintenance costs, security gaps and software that slows your organization down instead of moving it forward.
That is where Sirus comes in. Sirus started in 2011 as a .NET & SharePoint development company, and .NET is still the foundation of everything we build. Our .NET developers and architects deliver end-to-end custom solutions, both frontend and backend, with a strong focus on a solid architecture that fits the needs of your application and the application landscape it has to live in. Whether you’re a small or large organization, you can count on our .NET experts to optimize your workflow.
Some of the things we can help you with
- Building end-to-end custom software solutions, from analysis and architecture to frontend and backend development;
- Replacing or modernizing legacy applications into one future-proof platform, including a secure migration of your existing data;
- Designing a solid software architecture that fits both the needs of your application and the landscape it has to fit into;
- Developing low-code and no-code solutions with the help of Power Platform to simplify and automate your internal processes;
- Strengthening your IT team with experienced .NET consultants who take on assignments directly within your organization;
- Executing complete implementation projects in-house: implementing, organizing and managing your project from start to finish;
- Advising honestly on the right solution through our architect and senior profiles: custom development where it adds value, a standard solution where it solves your problem just as well;
- Adding .NET expertise and customizations to Data, IoT and Microsoft 365 projects, because there are no walls between the Sirus teams.
Meet the .NET team
The .NET team is the largest and longest-standing competence team at Sirus. More than 26 experienced developers, consultants and architects are led by Team Lead Gert and Competence Leads Tim and Stieven. The team continuously invests in knowledge sharing through internal competence evenings, training and conferences, so every solution is built on shared experience rather than individual knowledge.
Some .NET reference cases
Travi
Agentschap Natuur en Bos
Sirus helps Agentschap Natuur en Bos streamline and modernize internal processes with low-code solutions that make daily work faster, smarter, and more efficient.
ConstruTraining
What our .NET clients say
Read more
Reflections on iSAQB Software Architecture Gathering 2025
Two weeks ago I — Filip Nuyts — had the privilege of attending the iSAQB Software Architecture Gathering 2025 in Berlin. A truly inspiring event that brought together architects, developers, and thought leaders from across the globe.
Upcoming .NET events
Frequently asked questions
What kind of software does Sirus build with .NET?
Is .NET still a future-proof choice for custom software?
Yes. .NET is a mature, open-source development technology that is actively developed and supported by Microsoft, runs cross-platform and integrates seamlessly with the Azure cloud. Sirus has been building on .NET since 2011 and keeps its knowledge sharp through an active competence program of training, internal sessions and conferences.
Can Sirus modernize or replace our legacy application?
Absolutely, this is one of our core activities. We migrate outdated or end-of-support applications to one future-proof platform, including a secure migration of your existing data. For Travi, for example, we merged two legacy training applications into one platform built with Angular and .NET on Azure, while keeping the interface users were familiar with.
Do you provide individual .NET consultants or complete project teams?
Both. You can strengthen your team with experienced .NET consultants who take on assignments directly within your organization, or you can outsource your project entirely: Sirus then implements, organizes and manages the project end-to-end, in its own hands.
Does a .NET solution integrate with Microsoft 365, Azure and our data platform?
Yes. As a Microsoft Solutions Partner, Sirus combines .NET, Data and Microsoft 365 expertise under one roof, and there are no walls between our teams. .NET customizations regularly strengthen our Data, IoT and M365 projects, so your custom solution fits perfectly within your broader Microsoft environment.
How do we get started with a custom .NET project?
It starts with a conversation. Our architects and senior profiles first explore your needs and all possible options, because sometimes a standard solution solves your problem just as well as a fully custom build one. You get honest advice, a solid architecture and a clear course towards a working solution.
