Senior Developer – Join Our Global Team and Shape the Future of Fiber Broadband!

About COS Systems

We are a global software company that helps our clients connect people to high-speed fiber broadband, enabling their full participation in today’s digital world and economy. Our headquarters are located in Umeå, Sweden, but we have a global presence with team members in the USA, which together with Canada, is our most important market. You will work in an international environment where innovation and collaboration are key.

About the role

As a Senior Developer at COS Systems, you will play a crucial role in designing, developing, and maintaining our industry-leading software solutions. You will work closely with our product, support, and test teams to build scalable and high-performing applications that drive the fiber broadband industry forward. Your expertise will contribute to solving complex challenges and improving system architecture.

This is an exciting opportunity for an experienced developer who thrives in a dynamic environment and wants to make a significant impact on both technology and business growth. You will have the chance to influence product development, optimize performance, and ensure our solutions remain at the forefront of the market

We’d love to hear from you if you

Have extensive experience in software development, preferably with a background in web-based applications and cloud solutions.
Are proficient in modern programming languages such as C#, JavaScript/TypeScript, and frameworks like .NET and React.
Have strong skills in database management (SQL, NoSQL) and system architecture.
Thrive in a collaborative, agile environment and enjoy working closely with colleagues to drive innovation.
Have experience with DevOps, CI/CD pipelines, and cloud platforms such as Azure or AWS (a plus).
Are a problem solver who enjoys analyzing complex technical challenges and finding efficient solutions.
Have excellent communication skills and can effectively work with international colleagues across different time zones.
Are fluent in both written and spoken English.
Have experience with Microsoft’s development environments (C#, MS-SQL, Azure DevOps).

We offer you:

A unique opportunity to be an important part of a fast-growing global tech company.

A dynamic work environment with a strong company culture that values collaboration and expertise.

A fun and very nice office environment in central Umeå, with the flexibility to work partially remotely.

A supportive manager who encourages your personal and professional growth and gives you the freedom to achieve great results in your own way.

A competitive salary and benefits package.

Are you the experienced developer we’re looking for? Apply now and join our global team!

Questions about the position are welcomed and directed to Mattias Viberg,

Head of Software Engineering: mattias.viberg@cossystems.com

Department: Development

Role:Senior Developer (full-time entry-level)

Location: Umeå

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