Hybrid Senior Software Developer, Java/Kotlin, Spring Boot

at etalytics

• Job title: Senior Software Developer, Java/Kotlin, Spring Boot
• Job type: Full Time
• Experience level: Senior
• Salary: Not specified
• Degree requirement: Bachelor's Degree
• Tech skills: Cloud, Docker, Java, JUnit, Kotlin, Kubernetes, Mockito, Postgres, Spring, Spring Boot, SpringBoot, SQL
• Location requirements: Hybrid, Darmstadt, Germany

About the role

• Senior Software Developer developing scalable backend solutions using Java/Kotlin with Spring Boot for energy management. Joining the team in Darmstadt to improve system architecture and mentor junior developers.

Responsibilities

• Design, develop, and maintain scalable backend features – from REST APIs to the persistence layer – using Spring Boot with Java and/or Kotlin
• Actively contribute to the evolution of our cloud-native microservice architecture
• Continuously improve our system landscape using modern technologies such as Docker, Kubernetes, CI/CD pipelines, and asynchronous pub/sub mechanisms
• Provide technical and functional input for new product and solution ideas, including architecture and technology decisions
• Ensure high code quality and long-term maintainability through test-driven development, automated testing (e.g., JUnit, Mockito, MockK), and static code analysis
• Mentor and support junior developers while fostering a strong engineering culture focused on learning and knowledge sharing
• Collaborate closely with product management, developers, and domain experts to translate business requirements into scalable technical solutions
• Actively participate in internal knowledge exchange and continuously stay up to date with backend, cloud, and software engineering trends

Requirements

• At least 5 years of professional experience in backend software development with Spring Boot or comparable frameworks
• Strong proficiency in Java and/or Kotlin
• Experience in building RESTful APIs as well as working with SQL and data modeling
• Hands-on experience with relational databases, ideally PostgreSQL
• Solid understanding of software architecture, clean code principles, and modern software engineering practices
• Experience with CI/CD pipelines and automated testing (e.g., JUnit, Mockito, MockK)
• Experience in taking technical ownership, mentoring, or supporting less experienced developers
• Fluent English skills, both written and spoken
• Hands-on experience with Docker and container-based architectures (nice-to-have)
• Experience with Kubernetes and cloud-native platforms (nice-to-have)
• Experience with asynchronous architectures or event-driven systems (nice-to-have)
• German language skills are a plus (nice-to-have)

Benefits

• Purpose-driven work: Support industrial companies in becoming more efficient and sustainable
• Flexibility: Hybrid working with home office options and flexible working hours
• Team spirit: A supportive, collaborative environment with plenty of room for exchange and cooperation
• Community: Regular team events and shared activities
• Work-life balance: 30 days of vacation plus a flexible, agile work culture
• Well-being: Tax-free benefits card, subsidized local gym membership and the option of a job bike