Mid-level .NET Developer
First seen by Alion on Sep 2, 2026. Twoday Oy scores B on the Alion truth index.
Twoday is the leading digital transformation partner in Northern Europe with a global presence. With approximately 3,000 specialists, we collaborate with some of the most admired private and public organisations to deliver cutting-edge digital solutions. Our expertise spans software engineering, Data & AI, cloud platforms, digital experiences and business applications.
We are now looking for a Senior Platform Engineer to help transform a large-scale development and deployment platform from traditional DevOps into a modern AI-assisted and agentic engineering setup.
Permanent position at Twoday | Copenhagen
Mid-level .NET Developer
Are you a .NET developer with a minimum of two and up to to five years of professional experience who would like to broaden your skills across the technology stack? Twoday is looking for a curious developer who enjoys building software and has not limited themselves to either frontend or backend.
This is a mid-level development role without senior, lead or architecture responsibility. You will join an experienced team where you can contribute independently while continuing to develop your technical skills.
Your responsibilities
Develop and maintain solutions using C# and .NET
Contribute to both frontend and backend development
Develop and integrate REST APIs
Write automated tests and participate in code reviews
Troubleshoot and improve existing applications
Collaborate with developers, testers and business stakeholders
Contribute to CI/CD and continuous improvement
Use AI-assisted development tools critically and responsibly
Your background
A minimum of two and up to approximately five years of professional C# and .NET experience
Motivation to work across different parts of the technology stack
Experience with REST APIs and relational databases
Familiarity with automated testing and version control
Frontend experience with Angular, React, Vue or TypeScript is an advantage
Experience with Azure, Azure DevOps or CI/CD is an advantage
A curious and constructive approach to AI-assisted development
Fluent spoken and written Danish
Able to work full-time onsite in Copenhagen
What we offer
At Twoday, you will become part of a collaborative professional environment focused on knowledge sharing, technical quality and continuous learning. You will work alongside experienced colleagues and have the opportunity to broaden your skills through meaningful development tasks.
The position is a permanent role at Twoday, working full-time onsite with one of our public-sector customers in Copenhagen.
Interested? We look forward to receiving your application.
About Twoday
Twoday operates from modern offices across 30 locations in Norway, Sweden, Denmark, Finland, and Lithuania. We have a strong and unique social environment with highly engaged employees. If you are the candidate we are looking for, you will play a central role with exciting opportunities to grow within an international and innovative group, working on cutting-edge technology and software solutions. You will also have the flexibility to occasionally work from one of our main offices in Oslo, Stockholm, Copenhagen, Helsinki or Vilnius.
Diversity & inclusion
Do you not meet all the requirements? Studies show that women and minorities are less likely to apply for a job if they don’t meet every qualification. At Twoday, we are committed to building a workplace and community where everyone is welcome. If you are excited about this role but your previous experience doesn’t perfectly align with the job description, we still encourage you to apply.