Junior Back-end Developer

Työpaikkakuvaus Who we are Kassavirtanen Oy is a growing invoicing service company that designs and develops its own systems, websites, and digital services for businesses. We operate from a modern office in the heart of Helsinkis Kamppi district, where teamwork and open communication are at the core of everything we do. We focus on high-quality code, long-term development, and understanding our clients' businesses. You will have the opportunity to work on meaningful projects that matter to us and our clients. Your role with us We are now looking for a Back-End Developer who is passionate about building scalable and efficient back-end systems. You will work as part of our development team, designing and implementing back-end services and APIs that power both our own systems and custom web services for our clients. In collaboration with front-end developers and designers, you will help build powerful solutions that provide smooth and seamless user experiences. Technologies we use: C# / .NET – for back-end development SQL – working with databases and integrations JavaScript – basic knowledge for handling API integration and client-side logic REST APIs – building and maintaining APIs for web services and systems Familiarity with cloud platforms (Azure, AWS) and DevOps practices is a plus What we expect from you: Previous experience in back-end development (at least 2 years) Strong knowledge of C# / .NET and SQL databases Experience with designing and building REST APIs Ability to write clean, efficient, and maintainable code Experience working with version control (Git) Understanding of application architecture and scalability Teamwork skills and a willingness to learn Fluent in Finnish or English What we offer you: Interesting projects with the opportunity to influence their implementation A supportive work environment and colleagues who will help you grow A modern workspace in a cozy office in the heart of Kamppi Interested? We review applications and conduct interviews throughout the application period, so we encourage you to apply as soon as possible via our online application form. You are also welcome to send us an open application, as we are always interested in hearing from talented people. Please remember to indicate in your application which position you are applying for. About Us Kassavirtanen Oy is a Helsinki-based company founded in 2016 that offers affordable and hassle-free invoicing services as well as simplified entrepreneurship solutions. Our service allows you to invoice for your work without needing your own business ID, so our clients can focus on their work while we handle the paperwork. Kassavirtanen takes care of invoicing, paperwork, insurance, and collections on your behalf. The service costs just 3% of the invoice amount excluding VAT, and there are no separate charges for sending invoices or debt collection. We operate as part of Vastuu Groups Trusted Partner service and act as an agent for the Mutual Employment Pension Insurance Company Elo in matters related to YEL insurance. This ensures that our operations are transparent, reliable, and secure for our clients. Kassavirtanen Oy primarily serves freelancers as well as those working on a project or seasonal basis across various industries. Our main areas of expertise include HR consulting, IT services, and financial management services for light entrepreneurs. Kassavirtanen is a partner that makes invoicing a breeze—so you can focus on what you do best. Please fill the application via online application form https://account.jobportal.fi/tyopaikat/kassavirtanen-oy/171983/junior-back-end-developer/215187