C++ Engineer, Mid (+Java)

What you work on today shapes where you’ll be tomorrow. Looking for your next challenge as a C++ Engineer, Mid ? We may have the right opportunity for you. At B3, we start with people and their experience. We match projects to your skills and professional growth path. Our consultants work across a wide range of industries and technologies, delivering IT projects both in Poland and internationally. This allows you to build your career in a deliberate way - not by chance. We are part of an international organization listed on Nasdaq Stockholm, operating in 11 countries. In Poland, we operate with full autonomy. We choose our technologies, processes, and ways of working while maintaining the highest professional standards. Join us today. What we offer Work in a Scandinavian culture built on logic, trust, and open dialogue. Health and sports benefits tailored to your needs. Speed Coaching – short sessions designed to provide new perspectives and solutions. Sports training, an internal team, and opportunities to take part in competitions. Scope of the role: Building a new licensing model in C++ - developing a solution created from scratch, responsible for checking user entitlement to particular product features, working with large data sets (fetching, comparing, accepting or rejecting) Integrating the solution with existing tools - interface-based integration into desktop, web, server and batch applications; some of them are Java-based, so work at the seam between the technologies is done in Java Quality and cooperation with product teams - participation in test development (unit, integration, regression), code review, requirements adjustments, infrastructure updates and internal technical documentation What you need to join us: Must have: Strong C++ knowledge - the foundation of the role, around 80% of the work At least basic, hands-on Java experience (e.g. a year or two in a project where Java was used) - expert level is not expected English at C1+ level - fluent day-to-day communication in an international, distributed team Openness to working with other technologies (Java, JavaScript, Python), work in Polish business hours A team-oriented attitude - solving problems together, sharing ideas, staying in touch with the team rather than working in isolation Ability to work from the territory of Poland (citizenship, residence card, visa, etc.) Nice to have: JavaScript Python - used among others in tests and scripts REST API Knowledge of OAuth2, OpenID, IdP Experience working with large data sets