About usOptimus Search is working with a forward-thinking IoT company in the energy sector that's 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. They're 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.TasksDevelop 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.Profile2+ 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).