Join our growing Madrid team and work on meaningful .NET and cloud-based solutions for Danish and international clients, while collaborating with skilled colleagues across Spain and Denmark. We're looking for a Senior .NET Developer who wants to build impactful software solutions and help solve complex business challenges through technology.

As part of Mjølner Informatics, you'll join a company with a strong technical culture, a people-first mindset, and exciting opportunities ahead as we become part of Accenture, while still maintaining the collaborative and down-to-earth culture that defines Mjølner today.

Why Mjølner?

At Mjølner, you'll find a strong technical community, a high degree of trust, and the freedom to take ownership of your work while continuing to grow professionally.

What you'll get

- Competitive salary
- Yearly bonus
- Private health insurance
- 30 business days of vacation
- Hybrid setup with a minimum of 2 days per week in our central Madrid office
- A culture that genuinely values work-life balance and flexibility
- Possible trips to Denmark to collaborate with colleagues and experience our culture firsthand
- Strong professional communities and guilds within Backend, Frontend, Architecture, Security, and more
- Opportunities to influence technical decisions and continue developing your expertise
- A people-first culture where you'll grow as a developer while making a real impact

Your day-to-day You'll join a variety of projects for Danish and international clients, working closely with developers, consultants, and project managers across our Spanish and Danish offices.

Most of our projects are built on .NET, Azure, and modern cloud-native technologies, but industries, project scopes, and technical challenges vary.



We value freedom with responsibility, so you'll have significant influence over how you structure your work and solve technical challenges.

You'll also have the opportunity to share knowledge, attend technical meetups, and contribute to our professional communities.

What you'll bring

- University degree in Computer Science, Software Engineering, or a related field (or equivalent professional experience)
- Minimum 5 years of experience as a .NET developer, with solid expertise in C# and the .NET ecosystem
- Experience with backend architecture and design patterns, including building and maintaining RESTful APIs
- Solid understanding of relational databases and experience with data modelling and query optimisation
- Experience with microservices, containerisation, and cloud environments (Azure and/or AWS)
- Familiarity with Azure DevOps, Terraform, Kubernetes and/or CI/CD pipelines is an advantage
- High proficiency in English, both written and spoken
- Familiarity with AI tools and technologies, and the ability to leverage them effectively in day-to-day work
- A curious, solution-oriented mindset and a genuine interest in continuous learning and technical growth

About Mjølner Mjølner is an IT consultancy and software house with offices in Denmark and Spain. We are around 400 specialists helping customers solve complex business challenges through technology.

Founded in 1988, we've combined deep technical expertise with a people-first approach, helping our customers turn complex challenges into high-quality software solutions.

Interested?

If you'd like to learn more about the position, please contact Department Manager Asmae Arsmouk at [email protected].

We look forward to hearing from you!

📌 Senior Dotnet Developer (Madrid)
🏢 Mjølner Informatics
📍 Madrid