Backend Developer (Spring / Kotlin) (m/f/d)

Business Unit: BU ALS Customs Services Business Line: BL ALS Customs Services Target Hire Date: 2026-05-26 What You Can Expect: - 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 What You Bring: - 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 Apply To This Job