Senior Java Backend Developer - Cloud-Native Microservices & Cryptography

As a Senior Java Backend Developer at Giesecke+Devrient, you will lead the design, development, and maintenance of secure, scalable, cloud-native microservices for our Trusted Service Manager (TSM) platform. You'll focus on backend development with Spring Boot 4, cryptographic operations, automation, and test-driven practices in a Kubernetes-based environment.

What you'll do

• Lead end-to-end development and implementation of TSM backend services and microservices
• Design, develop, and optimize robust Java backend applications using Spring Boot 4 (including Spring Boot Actuator), Spring Cloud, and Spring Data
• Implement and maintain API-first architectures (REST, OpenAPI) with clear contracts and maintainable integrations
• Build, deploy, and operate cloud-native applications using Docker containers, Kubernetes, CI/CD pipelines, and automation tooling
• Implement secure cryptographic operations including PKI-based workflows, X.509 certificate lifecycle management, encryption, signing, and key management best practices
• Design data models and access layers using MongoDB for scalable, high-performance storage
• Drive automated testing and quality assurance through TDD and BDD, unit and integration testing, and security testing (SAST, DAST)
• Apply and advocate agile methodologies (Scrum), engineering best practices, and secure coding standards
• Collaborate closely with architects, product owners, QA engineers, and other developers to deliver high-quality solutions
• Guide and mentor other team members, promoting knowledge sharing and continuous improvement
• Contribute to observability and operations using Spring Boot Actuator and monitoring/logging tools

What you bring

• University degree in Computer Science, Software Engineering, or a related field
• Extensive experience as a senior backend Java developer
• Strong, hands-on expertise with Spring Boot (v4), including Spring Boot Actuator, Spring Cloud, and Spring Data
• Professional experience designing and implementing microservices in cloud-native environments
• Proficiency in MongoDB, including schema design, performance tuning, and operational considerations
• Solid knowledge of Docker and Kubernetes for containerized deployments and orchestration
• Proven track record building API-first solutions with RESTful services and OpenAPI/Swagger specifications
• Deep understanding of cryptography concepts and tooling, including PKI, X.509 certificates, secure key management, and cryptographic protocols
• Experience in agile teams (Scrum) with TDD and BDD, automated testing strategies, and security testing (SAST, DAST)
• Familiarity with large-scale, high-availability, enterprise-grade systems
• Hands-on experience with Atlassian tooling (Jira, Confluence), Git (GitLab/GitHub), SonarQube, Jenkins, Nexus, and Maven
• Strong problem-solving skills with the ability to troubleshoot complex distributed systems
• Excellent communication skills and a collaborative, team-oriented mindset
• Fluent English (spoken and written)

Nice to have

• Experience developing SDKs (Java or other languages) for external integration
• Knowledge of client application development (for example, mobile or desktop clients interacting with backend APIs)
• Background in financial services, payment systems, or digital currency projects

What we offer

• Permanent contract
• Hybrid work options available with flexible start time (1 hour flexibility). Schedule: Monday-Thursday 8:30-17:30, Friday 8:30-15:30
• Annual training plan
• Summer intensive schedule
• Company parking
• Flexible compensation options (transport, childcare, training, health insurance)
• Onsite cafeteria with breakfast and lunch at subsidized prices
• Location: El Prat de Llobregat, Mercabarna exit, accessible via Bus 88/110 from Barcelona or PR4 from El Prat

About Giesecke+Devrient

Giesecke+Devrient makes life safer for billions of people worldwide by creating trust in the digital era. With over 170 years as a trusted partner, the company develops integrated security technologies across Digital Security, Financial Platforms, and Monetary Technology. G+D is an international technology group with more than 14,000 employees in 40 countries.