(Senior) Backend Developer (m/f/d) · with Fullstack affinity in Bonn

On behalf of our client, we are seeking a (Senior) Backend Developer (m/f/d) with full-stack expertise for their Bonn location (including a flexible mobile office model). Our client is a leading solutions provider in the field of highly secure IT infrastructure and cryptography. In this role, your focus will be approximately 80% on backend development (Java, Spring Boot, PostgreSQL, security & network architecture), complemented by contributing to the user interface design using React.

Your responsibilities will include: contributing to the further development of a central management platform for network-wide security and device management (client-server architecture based on React and Spring Boot); developing modern user interfaces in close collaboration with the UX/UI team; designing and implementing backend services, including data migration from legacy systems; software development and integration on Linux-based systems; and designing and implementing automated software tests.

• Completed studies in computer science / a comparable field or comparable vocational training
• Several years of solid experience in professional software development
• Practical experience in agile teams (e.g., Scrum framework)
• Excellent knowledge of TypeScript, JavaScript and Java
• Secure use of frameworks and standards such as React, Spring Boot and REST APIs
• Familiarity with development and collaboration tools ( e.g., Git, GitLab, Jira, Confluence, Linux environments, relational databases such as PostgreSQL )
• Knowledge in the field of Identity & Access Management (e.g. Keycloak)
• Basic understanding of network protocols and technologies (VPN, TCP/IP, routing) as well as cryptographic concepts (asymmetric encryption, certificate management)
• Very good German and good English skills, both spoken and written.