At Kiona, we build technology that helps reduce unnecessary energy consumption, CO₂ emissions, and waste in buildings across Europe. By connecting existing systems and making data actionable, we enable customers to make better decisions – at scale.

We’re now looking for a Senior Software Engineer – Backend / Fullstack who wants to contribute to this mission by building robust, scalable solutions for one of our core products, and by using AI as a natural part of software development.

As a Senior Software Engineer at Kiona, you contribute through strong technical execution while also being a trusted, constructive team member. You’ll deliver complex features, maintain and modernise existing solutions, and take part in backend architecture decisions and shaping technical direction within the team, ensuring scalable, maintainable, and high quality results.

The role is primarily backend focused, while also involving work across the stack when needed. You’ll actively use AI tools, and collaborate closely with product, design, and engineering colleagues to align technical work with product goals. Solid engineering practices, performance considerations, and secure coding are treated as first class concerns.

You’ll be part of a distributed development team working across Norway, Sweden, and Lithuania, in an international environment where English is the primary working language. You’ll also support and guide less experienced engineers and contribute to continuously improving development practices across the team.

Just as important as what you build is how you work with others. We value engineers who take ownership, communicate clearly, and help create a pragmatic and collaborative engineering culture.

We are looking for someone who

• Has strong experience with backend development, primarily using .NET / C#;
• Has experience with frontend frameworks, such as React;
• Actively uses AI tools in the development process and helps drive good engineering practices;
• Has experience maintaining and modernising legacy systems in complex environments;
• Is solution oriented, pragmatic, and able to translate business needs into sound technical solutions;
• Communicates well across technical and non technical roles;
• Is reliable, confident in technical discussions, and supportive of others.

• Kiona is built on trust, curiosity, and creativity. We are problem-solvers who believe collaboration and openness are key to building great products – and a great workplace;
• The position is based at Kiona’s office in Kaunas, with a hybrid setup that allows some flexibility;
• You’ll join an international team working toward a clear purpose: making buildings part of a more sustainable future;
• Culture and well-being: Culture with Trust, curiosity & creativity; Nice colleagues with high competence; We are happy to pay attention to a colleague’s birthday, an anniversary or other fun event to celebrate; Coffee & fruit in the office; Christmas celebration; After Work or similar social activities; We contribute to charitable causes;
• Health focus: Extended Health insurance including extra Wellness allowance;
• Additional benefits that add a silver lining: flexible working hours and hybrid working model; 2 days to be used in connection with holidays to get a longer leave and the opportunity for recovery; Competence development; Recruitment bonus.