Back-End Developer: C#, REST APIs & Scalable Systems

Kassavirtanen Oy

Helsinki

On-site

EUR 55,000 - 75,000

Full time

12 days ago
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Benefits offered by this job

Competitive salary
Modern Kamppi office
Supportive team
Career growth

Job summary

Kassavirtanen Oy in Helsinki seeks a Back-End Developer who enjoys building scalable services. You will design and implement back-end systems and REST APIs powering our platforms, working with front-end developers to deliver smooth user experiences.

Required: 2+ years with C# / .NET and SQL, writing clean, maintainable code, and contributing to architecture. Git experience and a willingness to learn are essential in our collaborative, modern Kamppi office.

Qualifications

  • 2+ years of back-end development experience.
  • Strong knowledge of C# / .NET and SQL databases.
  • Experience designing and building REST APIs.
  • Write clean, efficient, maintainable code.
  • Experience with Git version control.
  • Understanding of architecture and scalability.
  • Fluent in Finnish or English.

Responsibilities

  • Design and implement back-end services powering our systems.
  • Build APIs for web services and client projects.
  • Collaborate with front-end developers and designers.
  • Ensure code quality and maintainability.
  • Contribute to DevOps and cloud deployment practices.

Skills

Back-end development
C# / .NET
SQL databases
REST APIs
Git
Software architecture
Teamwork
English or Finnish

Tools

Azure/AWS

Job description

Kassavirtanen Oy in Helsinki seeks a Back-End Developer who enjoys building scalable services. You will design and implement back-end systems and REST APIs powering our platforms, working with front-end developers to deliver smooth user experiences.

Required: 2+ years with C# / .NET and SQL, writing clean, maintainable code, and contributing to architecture. Git experience and a willingness to learn are essential in our collaborative, modern Kamppi office.

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