Hybrid Senior Software Engineer, Backend – Java/Kotlin, Spring Boot

at etalytics

• Job title: Senior Software Engineer, Backend – 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 creating scalable backend solutions for energy management with Java and Kotlin. Collaborating in a hybrid team environment focused on impact and sustainable development.

Responsibilities

• Design, develop and maintain scalable backend functionality — from REST APIs to the persistence layer — using Spring Boot with Java and/or Kotlin
• Actively shape and evolve 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 domain input to the development of 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
• Provide technical guidance, support and mentoring to junior developers and promote a learning-oriented engineering culture
• Work closely with product management, engineering and business stakeholders to translate domain requirements into scalable technical solutions
• Actively contribute to internal knowledge sharing and continuous development in backend, cloud and software engineering

Requirements

• At least 5 years of professional experience in backend software development using Spring Boot or comparable frameworks
• Strong proficiency in Java and/or Kotlin
• Experience developing RESTful APIs and working with SQL and data modeling
• Practical experience with relational databases, preferably 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 technical responsibility, mentoring or supporting less experienced developers
• Very good German skills and good English skills, both written and spoken

Benefits

• Meaningful work: Help industrial companies become more efficient and more sustainable
• Flexibility: Hybrid working with the option to work from home (two days per week) and flexible working hours
• Team spirit: A supportive, collegial environment with plenty of room for exchange and collaboration
• Community: Regular team events and shared activities
• Work–life balance: 30 days of vacation and a flexible, agile working culture
• Health: Subsidy for a local gym and the option to lease a company bike