Senior Java Backend Developer – Cloud-Native Microservices & Cryptography
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.
- Knowledge of client application development (e.g., mobile or desktop clients interacting with backend APIs).
- Background in financial services, payment systems, or digital currency projects.
This role is ideal for a senior backend engineer who enjoys working on secure, high-availability microservices, is comfortable with advanced cryptography, and wants to drive automation and quality across the entire delivery lifecycle.
What we offer
- CULTURE: Join a professional, dynamic environment where collaboration, teamwork, and innovation are valued.
- PHILOSOPHY: Be part of a team where your ideas and contributions have real impact.
- SCHEDULE: Mon–Thu 8:30–17:30h, Fri 8:30–15:30h (1h flexible start time). Hybrid work options available.
- CONTRACT & BENEFITS: Permanent contract, annual training plan, summer intensive schedule, company parking, flexible compensation (transport, childcare, training, health insurance).
- CANTEEN: 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.
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