Backend Developer (Rust), SensorFu

**Interested in building a cybersecurity product where your code directly impacts real-world network security? We are now looking for a Backend Developer to join SensorFus growing team.** _SensorFu is a Finnish cybersecurity company focused on securing mission-critical networks. We develop solutions that help organizations ensure their isolated networks truly remain isolated, continuously testing network segmentation and detecting potential leaks before they turn into real security incidents. Our customers operate in industries such as energy, infrastructure, and defense, where even small vulnerabilities can have serious consequences. Our approach is built on transparency, innovation, trust, and simplicity in design, with a focus on practical security that works in real environments._ **Would you be our new Backend Developer?** In this role, you will work on the backend of SensorFus core product, the Beacon Home component, which acts as the central service responsible for managing Beacons, handling incoming data, and exposing APIs for monitoring and alerting. You will develop functionality using Rust and work closely with databases and HTTP APIs. You will work closely with the founding team and other developers, collaborating on day-to-day development, reviewing each others code, and contributing to how the product evolves. While this is a hands-on development role, an interest in architecture and technical decision-making is seen as a benefit. Depending on your background and interests, you may also contribute to the UI side or bring in expertise related to Windows or Android environments. The tech stack is built around Rust as the primary backend language (using Tokio for asynchronous programming), with HTTP APIs developed using Axum and SQLite as the database. The position is a full-time, permanent role, and you will be employed by Biisoni. The role is ideally based in Oulu, where the team meets at the office once a week. We hope youre able to join these on-site days, but remote work within Finland is also possible. **What are we looking for?** To succeed in this role, you have at least a couple of years of experience in software development and some hands-on experience with Rust. You dont need to be a senior Rust expert, but you should be familiar with the language and able to work with it in practice. Experience with low-level programming languages such as C or C++ is also considered an advantage, especially if you are transitioning towards Rust. You have experience in backend development and are familiar with building HTTP APIs and working with SQL databases such as SQLite. You are comfortable working with both existing code and new development, and you have a solid understanding of how backend systems function in practice. Experience with Windows or Android environments, as well as familiarity with network protocols, is considered a plus. In this role, you will work as part of a small team, which requires both independence and collaboration. You take ownership of your work, approach problems with a solution-oriented mindset, and move things forward proactively. You are comfortable asking questions when needed and contributing to shared goals as part of a team. You communicate fluently in English, and Finnish is considered an advantage. **Why join us?** At SensorFu, you will work on a meaningful cybersecurity product where your contribution has a real and visible impact. You will join a small but highly skilled team, where everyone plays a key role in building the product and moving the company forward. The team operates with low hierarchy and quick decision-making, allowing you to influence both the technical direction and ways of working as the company grows. You will have genuine ownership of your work and the opportunity to challenge yourself in a hands-on environment. As the company grows, you will have the opportunity to shape your role based on your strengths and interests, whether that means deepening your technical expertise or taking a larger role in architectural decisions. The salary range for this position is 3500-5000 €/month, depending on your experience and skills. **Are you interested?** Does this sound like your next step? Please submit your application via the link either in English or Finnish as soon as possible, but no later than 17.5.2026. We will begin interviews during the application period. The recruitment process is carried out in cooperation with Biisoni. For more information, please contact Biisonis Recruitment Consultant Nea Repo (050 476 8137 or **nea.repo@biisoni.fi**).