Senior Java Backend Developer – Cloud-Native Microservices & Cryptography
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We are looking for a Senior Java Backend Developer to lead the design, development, and maintenance of secure, scalable, cloud-native microservices for our Trusted Service Manager (TSM) platform. This role focuses on backend development with Spring Boot 4, cryptographic operations, automation, and test-driven practices in a Kubernetes-based environment.
Key Responsibilities
Lead the 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
Spring Data
Implement and maintain API-first architectures (REST, OpenAPI), ensuring clear contracts and maintainable integrations.
Build, deploy, and operate cloud-native applications using:
Docker containers
Kubernetes (K8s)
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:
TDD and BDD
Unit, integration, and end-to-end test automation
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.
Required Skills & Experience
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:
RESTful services
OpenAPI/Swagger specifications
Deep understanding of cryptography concepts and tooling:
PKI, X.509 certificates
Secure key management and cryptographic protocols
Experience in agile teams (Scrum) with:
TDD and BDD
Automated testing strategies
Security testing (SAST, DAST)
Familiarity with large-scale, high-availability, enterprise-grade systems.
Hands-on experience with Atlassian and DevOps tooling:
Jira, Confluence
Git (GitLab/GitHub)
SonarQube, Jenkins, Nexus, 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. xqbhyrx
Knowledge of client application development (e.g., mobile or desktop clients interacting with backend APIs).
Background in financial services,

📌 Senior Java Backend Developer - Cloud-Native Microservices & Cryptography (Barcelona)
🏢 Giesecke+Devrient
📍 Barcelona