Senior Developer
Workplace: Umeå, Sweden
Expires: June 27, 2025
Senior Developer position at COS Systems AB, a global software company specializing in enabling high-speed fiber broadband connectivity. The role involves designing, developing, and maintaining industry-leading software solutions in a dynamic and international environment, working closely with product, support, and test teams to innovate and improve system architecture.
Main requirements:
  • Extensive experience in software development, preferably in web-based and cloud solutions.
  • Proficiency in modern programming languages such as C#, JavaScript/TypeScript.
  • Strong skills in .NET and React frameworks.
  • Experience in database management (SQL, NoSQL) and system architecture.
  • Experience with DevOps, CI/CD pipelines, and cloud platforms like Azure or AWS is a plus.
  • Problem-solving skills for complex technical challenges.
  • Excellent communication skills for working with international colleagues across time zones.
  • Fluency in both written and spoken Swedish and English.
  • Experience with Microsoft development environments (C#, MS-SQL, Azure DevOps).
Responsibilities:
  • Design, develop, and maintain industry-leading software solutions.
  • Collaborate closely with product, support, and test teams to build scalable, high-performing applications.
  • Contribute to solving complex challenges and improving system architecture.
  • Influence product development and optimize system performance.
  • Ensure solutions remain market-leading and innovative.
Required hard skills:
  • C# programming
  • JavaScript/TypeScript
  • .NET framework
  • React framework
  • SQL and NoSQL database management
  • System architecture
  • Microsoft development environments (MS-SQL, Azure DevOps)
Recommended hard skills:
  • DevOps practices
  • CI/CD pipelines
  • Cloud platforms (Azure, AWS)
Soft skills:
  • Collaboration and teamwork
  • Innovation mindset
  • Problem solving
  • Excellent communication skills
  • Adaptability to international and dynamic environments
Coding languages:
  • C#
  • JavaScript
  • TypeScript
Frameworks:
  • .NET
  • React
Natural languages:
  • Swedish (Proficient)
  • English (Proficient)
Cultural skills:
  • Working effectively in an international environment
  • Agile working methods
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