Backend Developer (Spring / Kotlin)

• Work on a large-scale Customs Management System processing thousands of declarations every day
• Design and build modern backend services with Spring Boot, Kotlin, and cloud-native technologies
• Take ownership of technical solutions and contribute to architectural decisions
• Work with modern technologies such as Kubernetes, Docker, Kafka/RabbitMQ, and Microsoft Azure
• Collaborate closely with international, cross-functional teams in an agile environment
• Opportunity to shape engineering standards and improve system reliability
• Drive technical innovation and contribute proactively with your ideas
• A culture that values ownership and continuous learning
• High level of flexibility and autonomy in how you approach technical challenges
• Fully remote setup with flexible working hours and regular team events in European cities

Do you have experience in TypeScript?, * Strong experience with Spring Boot; Kotlin experience preferred (or willingness to learn)

• Solid knowledge of relational databases (e.g. PostgreSQL, SQL Server), SQL, schema design, and ORMs such as Hibernate / Spring Data JPA
• Experience with HTTP/REST APIs, SFTP, and API design/documentation (OpenAPI / Swagger)
• Commitment to clean, maintainable code (Clean Code, SOLID, design patterns, code reviews) and automated testing (unit, integration, end-to-end)
• Experience with Git workflows and modern development practices
• Experience with microservices and event-driven architectures (e.g. Kafka, RabbitMQ) and cloud-native development, ideally on Microsoft Azure
• Familiarity with Kubernetes, Docker, and CI/CD pipelines (GitLab CI/CD, GitHub Actions) as well as basic understanding of application security (OAuth2, JWT, secure API design)
• Experience with monitoring, logging, and tracing tools (e.g. Grafana, Prometheus, ELK, OpenTelemetry) and understanding of scalability, resilience, and performance optimization
• Agile mindset with experience in Scrum/Kanban and tools such as Jira or Confluence, willingness to support frontend topics (Vue.js / TypeScript is a plus)
• Strong communication skills in English

Pulled from the full job description

• Work from home
• Flexible schedule

rent24 bietet flexible Coworking- und Coliving-Lösungen für Freiberufler, Startups, Gründer, Unternehmen und Firmen gleichermaßen. Mit den aktuellen Coworking-Standorten in Berlin, Bremen, Dortmund, Hamburg und Amsterdam bietet rent24 eine Vielzahl offener und geschlossener Büroräume, kreativ eingerichtete Tagungs- und Konferenzräume, einen Activity Room mit Tischtennisplatte, Tischfußball und Nintendo Wii sowie mehrere Loungebereiche und ein privates Kino.