System Administrator – Firewall Administration EA-1340

NAXCON GmbH, located in the heart of Freiburg, is at the forefront of the German IT and engineering industry. Our experts have extensive knowledge in software and hardware development, state-of-the-art electronics, and future-oriented technologies such as artificial intelligence and virtual reality. We are not only dedicated to project work for our customers, but also intensively pursue in-house innovation projects as well as research & development. Renowned companies from a wide range of German industries place their trust in us - demonstrating the outstanding expertise and commitment of our engineers. Position : System Administrator – Firewall Administration Location : Berlin, Bonn Hardtberg, Frankfurt, Leipzig, Munich, Rheinbach, Wilhelmshaven Field : Defence Type : Full-time/20% Remote Project / Department Overview The System / Firewall Administrator is responsible for reviewing, implementing, testing, and documenting firewall rule requests within an IT infrastructure environment. The main objective of the role is to enable required network communication for applications in a secure, controlled, and compliant manner, while ensuring that IT security policies and operational standards are not compromised. The position focuses on firewall administration, network security, change implementation, documentation, and coordination with application owners, requestors, and network teams. Responsibilities The System / Firewall Administrator will be responsible for the following tasks: Analyze and process incoming firewall rule requests, for example from ticketing systems. Review technical and functional requirements, including source systems, target systems, ports, protocols, and communication direction. Coordinate with requestors, application owners, and network teams in case of unclear or incomplete requirements. Assess firewall requests from an IT security perspective in line with applicable security policies. Configure and implement firewall rules on central and decentralized firewall systems. Modify existing firewall rule sets while following least-privilege principles. Execute firewall changes in accordance with defined change management processes. Ensure that changes have minimal impact on existing network communication. Perform functional tests to validate implemented firewall rules. Analyze network traffic and firewall logs for troubleshooting and error diagnosis. Support business or technical departments during the validation of network communication. Fully document all implemented firewall rules in ticketing systems or configuration documentation. Maintain firewall rule sets and update network documentation. Ensure that all changes are documented in a traceable manner according to audit and compliance requirements. Regularly review existing firewall rules with regard to necessity and security. Identify and clean up outdated, redundant, or unnecessary firewall rules. Required Qualifications and Certifications Cisco CCNP certification in routing and switching, or a comparable certification in the network security environment. Good understanding of network technologies, firewall concepts, routing, switching, ports, protocols, and network communication flows. Knowledge of IT security principles, especially firewall rule management and least-privilege concepts. Understanding of change management processes in IT infrastructure environments. Ability to work with ticketing systems and technical documentation tools. Required Professional Experience The candidate should have: At least 2 years of professional experience in a network environment , for example as a Network Administrator, System Administrator, or Firewall Administrator. Practical experience with firewall rule implementation, firewall request analysis, and firewall documentation. Experience in analyzing network traffic, firewall logs, and communication issues. Experience in coordinating technical changes with requestors, application owners, and network/security teams. Language Requirements German: C1 level according to CEFR. English: B1 level according to CEFR. Proof of language skills may be provided through a CV, certificate, reference, self-declaration, or equivalent evidence. Native speakers are exempt from providing separate proof for the respective language. Required Project Reference Information If project references are required, they should include the following information: Industry Project title Short project description Duration of the candidate's assignment Detailed description of the candidate's tasks and responsibilities in the project Required Soft Skills The candidate should demonstrate: Strong teamwork and collaboration skills. Professional and appropriate communication style. Clear and structured verbal expression. Accuracy and attention to detail in technical documentation. Security-conscious and process-oriented working style. Ability to communicate clearly with both technical and non-technical stakeholders. Reliability, responsibility, and a structured approach to task execution. Ability to work independently in a remote or hybrid environment. What we offer: • Join a cosmopolitan and internationally mixed team: We welcome individuals from all backgrounds and cultures to contribute their unique perspectives and talents to our team. • Polish your German language skills: If you are looking to improve your German language skills, we offer a supportive environment where you can practice and develop your language abilities: whether you are a beginner or an advanced speaker. • Benefit from a fixed contact person from the company: We understand the importance of having a reliable point of contact within the company. That's why we assign a dedicated contact person who will provide guidance and support throughout your employment with us. • Professional growth and development: With us, our engineers can immerse themselves in new industries or projects after just 1-2 years and actively transfer knowledge. • Enjoy regular team events with the company: We believe in the power of team building and fostering positive relationships within the workplace. That's why we organize regular team events to promote collaboration and strengthen our team bonds. • Competitive compensation package: At NAXCON, we believe that our engineers are our greatest asset. That's why we offer a comprehensive and competitive compensation package that includes a salary commensurate with experience and expertise.