Optimus Search has partnered with a ground-breaking IoT company in the energy sector! Their revolutionary new product helps customers achieve their net-zero climate goals by reducing heating energy consumption in both new and existing buildings. They are looking for a Senior Full-Stack Software Developer skilled in C#.NET to strengthen their team. As a Microsoft Gold Partner, they leverage cutting-edge technologies, and in this role, you will have the opportunity to work in the cloud! Your Responsibilities as a Backend Cloud Developer: 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 a LoRaWAN-based IoT infrastructure. Collaborate with frontend developers to create customer-focused applications for multiple platforms. Your Profile: Several years of proven experience in developing backend applications using C# and ASP.NET Core. Strong proficiency with databases such as PostgreSQL and CosmosDB. 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. Advanced German language skills (B2 level or higher).