Senior Software Developer (m/f/d) Java/Kotlin with Spring Boot

Do you want to build software that truly makes an impact? At etalytics, we develop intelligent energy management solutions that help industrial companies reduce energy consumption, lower CO₂ emissions, and cut costs. With our AI- and data-driven products, we actively contribute to a more sustainable future.As a Senior Software Developer, you will join our backend team in Darmstadt and work on our etaONE® platform. You will take technical ownership, actively contribute to architectural decisions, and support the growth of our engineering team with your experience. If you care about clean code, modern architectures, and meaningful software, you will feel right at home with us.Tasks:Design, develop, and maintain scalable backend features – from REST APIs to the persistence layer – using Spring Boot with Java and/or KotlinActively contribute to the evolution of our cloud-native microservice architectureContinuously improve our system landscape using modern technologies such as Docker, Kubernetes, CI/CD pipelines, and asynchronous pub/sub mechanismsProvide technical and functional input for new product and solution ideas, including architecture and technology decisionsEnsure high code quality and long-term maintainability through test-driven development, automated testing (e.g., JUnit, Mockito, MockK), and static code analysisMentor and support junior developers while fostering a strong engineering culture focused on learning and knowledge sharingCollaborate closely with product management, developers, and domain experts to translate business requirements into scalable technical solutionsActively participate in internal knowledge exchange and continuously stay up to date with backend, cloud, and software engineering trendsMust-have:At least 5 years of professional experience in backend software development with Spring Boot or comparable frameworksStrong proficiency in Java and/or KotlinExperience in building RESTful APIs as well as working with SQL and data modelingHands-on experience with relational databases, ideally PostgreSQLSolid understanding of software architecture, clean code principles, and modern software engineering practicesExperience with CI/CD pipelines and automated testing (e.g., JUnit, Mockito, MockK)Experience in taking technical ownership, mentoring, or supporting less experienced developersFluent English skills, both written and spokenNice-to-have:Hands-on experience with Docker and container-based architecturesExperience with Kubernetes and cloud-native platformsExperience with asynchronous architectures or event-driven systemsGerman language skills are a plusBenefits:Purpose-driven work: Support industrial companies in becoming more efficient and sustainableFlexibility: Hybrid working with home office options and flexible working hoursTeam spirit: A supportive, collaborative environment with plenty of room for exchange and cooperationCommunity: Regular team events and shared activitiesWork-life balance: 30 days of vacation plus a flexible, agile work cultureWell-being: Tax-free benefits card, subsidized local gym membership and the option of a job bikeFind Jobs in Germany on Arbeitnow