About us Optimus Search is working with a forward-thinking IoT company in the energy sector thats developing technology to help reduce heating energy use in both new and existing buildings. Their product plays a key role in helping customers reach net-zero climate goals. Theyre looking to hire a Backend .NET Developer to support their growing team. As a Microsoft Gold Partner, they work with modern tools and technologies, and this role offers the chance to develop solutions in a cloud-based environment. Tasks * Develop scalable, reliable, and efficient backend services for our cloud-native IoT platform. * Take ownership of entire functional areas or services and guide them through the full development lifecycle. * Actively shape system architecture and select the most suitable frameworks and technologies. * Work closely with data scientists to optimize and implement algorithms that directly impact the user experience. * Operate in a state-of-the-art technology environment with ASP.NET Core and IoT infrastructure. * Collaborate with frontend developers to create customer-focused applications for multiple platforms. Profile * 2+ years of proven experience in developing backend applications using C# and ASP.NET Core. * Strong proficiency with databases. * Passion for implementing and optimizing complex algorithms. * Experience in Domain-Driven Design (DDD) and event-driven architectures. * Hands-on experience with messaging technologies such as Kafka, Azure Event Hub, and MQTT in production environments is an advantage. * Advanced German language skills (B2 level or higher).