IT Architect / .NET Developer

IT Architect / Senior .NET System Developer

B2B Contract | Örebro, Sweden | Hybrid (3 days on site) | Feb 2027 to Jan 2031

We are partnering with a large Swedish public sector organisation to find a Senior IT Architect with strong hands-on .NET development experience. This is a long-term assignment of around four years, working in agile teams that develop, maintain and modernise business-critical systems.

The role combines IT architecture, hands-on development, technical leadership and knowledge sharing. You will work closely with product owners, architects, developers and business stakeholders to design solutions aligned with enterprise architecture principles. The environment is primarily C#/.NET, alongside migrated mainframe systems built on the Asysco AMT framework.

What you will be doing

• Designing and maintaining solution and system architectures in line with enterprise standards

• Working across the full lifecycle: requirements, design, coding, testing, integration and implementation

• Building and maintaining applications in C#, .NET, ASP.NET MVC, Web API, SQL Server and WCF

• Automating processes and development activities with PowerShell

• Applying TDD and automated testing practices

• Maintaining and further developing migrated mainframe systems on Asysco AMT

• Leading technical activities within Scrum teams and mentoring colleagues

What you will need

• Senior level experience, typically 9 to 12 years in a similar role, with proven technical leadership

• 6+ years with C#, SQL Server, WCF and ASP.NET MVC

• 4+ years each of PowerShell automation, Microsoft Web API development and TDD / automated testing

• 3+ years in agile environments

• 4+ years with the Asysco AMT framework, including further development of migrated mainframe systems

• Good spoken and written Swedish

Nice to have

• A current IT architecture certification

• Recent Asysco AMT experience in a mainframe environment

• Previous assignments for a government agency or an organisation with 1,000+ employees

• Integration experience with WCF and REST

Good to know

• Start: 1 February 2027 at the earliest

• Security-classified assignment: Swedish security screening must be completed before start

• On site in Örebro at least 3 days per week

• A reference assignment will be required

If this sounds like you, apply now or message me directly to find out more.