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

Kassavirtanen Oy; Helsinki; On-site; EUR 55,000 - 75,000; Full time

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.