Senior .NET Developer

Senior .NET Developer Where technology meets care Apply to B3 B3 Consulting's vision is to create a world of technology in which people come first. We come from Sweden, and our mission is to take care of how we live and work . Our "Care" philosophy results in technology meeting care, which allows us to build long-term relationships while creating innovative solutions. At B3, we unleash the potential of companies through IT outsourcing in a unique, Scandinavian model. We are one of the fastest growing companies in Poland, awarded the title of "Business Gazelle" in 2023 💪 If, like us, you value: 💥 Energy 💡 Logic 💻 Experience This is great - we fit together perfectly! The project comes from Natue/Forestry industry and concerns building a large-scale, real-time platform powering mobile apps, IoT devices, and backend services for hundreds of thousands of users — even under extreme peak loads. We’re looking for engineers passionate about building robust, long-lasting systems — not just shipping features. Your tasks: · Design, build, and operate backend microservices using .NET (C#, ASP.NET Core) · Build and evolve client-facing APIs with strong focus on: versioning; backward compatibility; long-term maintainability · Work with event-driven systems ( Google Pub/Sub, Kafka ) · Improve platform stability, performance, and scalability · Participate in production support and incident resolution · Collaborate closely with platform, product, embedded, and mobile teams · Take end-to-end ownership from design to production Your skills: ·Strong experience with .NET backend development (C#, ASP.NET Core) · Solid understanding of microservice architectures · Experience building production-grade APIs · Experience with messaging systems (Google Pub/Sub and/or Kafka) · Proven experience running and maintaining production systems · Strong testing and debugging skills (unit, integration, performance) · Comfortable with Git and modern development workflows (code reviews, CI/CD) · Clear communication and documentation skills · Strong ownership mindset — you care about what happens after deployment · Willingness to use AI tools responsibly to improve development productivity · Fluent in English communication On board with B3 you will receive: Health and sports benefits tailored to your needs Free running and swimming training, internal triathlon team, joint competitions (Warsaw) Tailor-made development activities to deepen expert knowledge Cyclical initiatives allowing development in IT fields other than the current one We are waiting for you! 🦓 Zespół Software Development & Digital Services Tryb pracy Zdalnie Warszawa