About this role
<p><strong>About Bull</strong></p> <p> </p> <p>Bull is a story. One with a century of European innovation and a working environment where experts design powerful, sustainable, and sovereign digital solutions, enabling states and industries to retain full control over their data and their AI.</p> <p> </p> <p>Bull is also thousands of engineers, researchers and passionate tech people shaping the future of high‑performance computing, AI, and quantum technologies.</p> <p> </p> <p>Every day, our teams push the boundaries of what is technologically possible – from next‑generation HPC architectures to exascale supercomputers – supported by world‑class R&D, more than 1,600 patents, and unique end‑to‑end capabilities spanning hardware design, software engineering, data science and quantum research.</p> <p> </p> <p>We are a people‑centric, innovation‑driven company, where collaboration spans Europe, the Americas and India. We share a common vision of a responsible and sustainable innovation that delivers concrete impact for our customers.</p> <p> </p><p> </p> <p><strong>Role Overview</strong></p> <p><br>Bull is looking for a motivated and proactive <strong>Back‑end Developer & Analyst</strong> 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.</p> <p> </p> <div> <p><strong>Key Responsibilities</strong></p> <ul> <li>Design, develop, test, and maintain backend services using <strong>Kotlin / Java</strong>, <strong>microservices</strong>, and <strong>REST APIs</strong>.</li> <li>Participate in the full <strong>software development lifecycle</strong> within an Agile environment (Scrum).</li> <li>Contribute to <strong>analysis and definition of technical requirements</strong>, user stories, and solution design.</li> <li>Implement and integrate <strong>security and identity‑related solutions</strong>, including Proofs of Concept (PoCs).</li> <li>Work with <strong>CI/CD pipelines</strong> to support automated testing and deployment (Docker‑based environments).</li> <li>Collaborate with cross‑functional teams, including architects, DevOps, and product stakeholders.</li> <li>Ensure clean, maintainable, and well‑documented code following best practices.</li> <li>Support troubleshooting, performance optimization, and continuous improvement of backend systems.</li> </ul> <p> </p> <div> <p><strong>Required Skills & Experience</strong></p> <ul> <li>Bachelor’s degree in <strong>Computer Science, Software Engineering</strong>, or a related technical field.</li> <li><strong>2+ years of professional experience</strong> in backend development using <strong>Kotlin and/or Java</strong>.</li> <li>Strong experience with <strong>microservices architecture</strong>, <strong>REST APIs</strong>, and <strong>Swagger/OpenAPI</strong>.</li> <li>Experience working in <strong>Agile/Scrum</strong> development environments.</li> <li>Solid experience with <strong>CI/CD tools</strong> and automated pipelines, including <strong>Docker</strong>.</li> <li>Good understanding of backend system integration and testing.</li> <li>Fluent <strong>English</strong> (written and spoken).</li> </ul> <p> </p> <div> <p><strong>Other Desirable Skills</strong></p> <ul> <li>Ability to quickly adapt to new frameworks, technologies, or programming languages.</li> <li>Experience with <strong>Kubernetes</strong>, including cluster lifecycle management, networking, security, and storage.</li> <li>Experience with <strong>Spring / Spring Boot</strong> and cryptographic libraries.</li> <li>Knowledge of <strong>Linux system administration</strong> and troubleshooting distributed systems.</li> <li>Experience with <strong>digital identity technologies</strong>, including <strong>Self‑Sovereign Identity</strong>, <strong>OIDC</strong>, <strong>OAuth 2.0</strong>, <strong>FIDO</strong>, and <strong>PKI certificates</strong>.</li> <li>Exposure to <strong>research and innovation projects</strong> (e.g. Horizon Europe / H2020 / FP7).</li> </ul> <p> </p> <div> <p><strong>Personal Skills</strong></p> <ul> <li>Proactive, autonomous, and solution‑oriented mindset.</li> <li>Strong analytical and problem‑solving skills.</li> <li>Team‑oriented attitude with good communication skills.</li> <li>Willingness to learn and grow in an innovative R&D environment.</li> </ul> <p> </p> <div> <p><strong>Location: Madrid or Barcelona</strong>, or remote within Spain.</p> <p> </p> <div> <p><strong>Benefits</strong><strong> </strong></p> <ul> <li>Flexible work schedule half-day Fridays and an intensive summer workday supporting work life balance.</li> <li>Learning and Growth Opportunities to work with advanced technologies in an innovative and supportive R&D environment.</li> </ul> </div> <p><span style="color:white"><span>#Bull</span> </span></p> </div> </div> </div> </div> </div><p> </p> <p><strong>Join us!</strong></p> <p> </p> <p>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.</p>