Senior Software Developer, Java/Kotlin, Spring Boot

etalytics

Senior Software Developer at etalytics developing and maintaining backend solutions using Java/Kotlin for energy management. Contributing to microservice architecture and mentoring junior developers in a collaborative environment.

Posted 5/5/2026full-timeDarmstadt • 🇩🇪 GermanySenior💰 $103,000 - $169,000 per yearWebsite

Tech Stack

Tools & technologies

CloudDockerJavaJUnitKotlinKubernetesMockitoPostgresSpringSpring BootSpringBootSQL

About the role

Key responsibilities & impact

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

What you’ll need

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
Nice-to-have: Hands-on experience with Docker and container-based architectures
Experience with Kubernetes and cloud-native platforms
Experience with asynchronous architectures or event-driven systems
German language skills are a plus

Benefits

Comp & perks

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

ATS Keywords

✓ Tailor your resume

Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard Skills & Tools

JavaKotlinSpring BootREST APIsSQLdata modelingPostgreSQLCI/CDautomated testingasynchronous architectures

Soft Skills

mentoringcollaborationcommunicationtechnical ownershipknowledge sharingproblem-solvingadaptabilityleadershipteamworklearning