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# Back-end Developer & Analyst

- **Company:** Bull Bull
- **Location:** Madrid, Spain (Remote available)
- **Contract:** Permanent contract
- **Skills:** Java (Programming Language), Agile Methodology, Automation of Tests, Continuous Integration, DevOps, Distributed Systems, OAuth, OpenID, Performance Tuning, Public Key Infrastructure, Scrum Methodology, Swagger, Software Engineering, Systems Integration, Openapi, Delivery Pipeline, Spring-boot, Backend, Kotlin, Kubernetes, Information Technology, Restful APIs, Workday, Docker, Programming Languages, Microservices
- **Published:** August 11, 2026
- **Apply:** https://es.trabajo.org/oferta-4021-8b8810430853181437b4cbe4921b3f0f

## About the Role

stakeholders. - Ensure clean, maintainable, and well-documented code following best practices. - Support troubleshooting, performance optimization, and continuous improvement of backend systems. Required Skills & Experience - Bachelor's degree in Computer Science, Software Engineering, or a related technical field. - 2+ years of professional experience in backend development using Kotlin and/or Java. - Strong experience with microservices architecture, REST APIs, and Swagger/OpenAPI. - Experience working in Agile/Scrum development environments. - Solid experience with CI/CD tools and automated pipelines, including Docker. - Good understanding of backend system integration and testing. - Fluent English (written and spoken). Other Desirable Skills - Ability to quickly adapt to new frameworks, technologies, or programming languages. - Experience with Kubernetes, including cluster lifecycle management, networking, security, and storage. - Experience with Spring / Spring
Boot and cryptographic libraries. - Knowledge of Linux system administration and troubleshooting distributed systems. - Experience with digital identity technologies, including Self-Sovereign Identity, OIDC, OAuth 2.0, FIDO, and PKI certificates. - Exposure to research and innovation projects (e.g. Horizon Europe / H2020 / FP7). Personal Skills - Proactive, autonomous, and solution-oriented mindset. - Strong analytical and problem-solving skills. - Team-oriented attitude with good communication skills. - Willingness to learn and grow in an innovative R&D environment. Location: Madrid or Barcelona, or remote within Spain. Benefits - Flexible work schedule half-day Fridays and an intensive summer workday supporting work life balance. - Learning and Growth Opportunities to work with advanced technologies in an innovative and supportive R&D environment. Bull Join us Here, your ideas, your curiosity and your technical excellence directly shape the next era of
advanced computing - unlocking enterprise value, accelerating scientific progress and driving positive impact for society.

## Description

motivated and proactive Back-end Developer & Analyst to join our international R&D team. In this role, you will take ownership of the implementation, integration, and testing of backend and security solutions, contributing to next-generation cloud and HPC platforms. You will work in a dynamic, innovative environment, collaborating closely with technical and business stakeholders. Key Responsibilities - Design, develop, test, and maintain backend services using Kotlin / Java, microservices, and REST APIs. - Participate in the full software development lifecycle within an Agile environment (Scrum). - Contribute to analysis and definition of technical requirements, user stories, and solution design. - Implement and integrate security and identity-related solutions, including Proofs of Concept (PoCs). - Work with CI/CD pipelines to support automated testing and deployment (Docker-based environments). - Collaborate with cross-functional teams, including architects, DevOps, and product


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