📍 Job Overview

Job Title: IT Netzwerk Administrator/ IT Network Engineer (w/m/d)
Company: Drees & Sommer SE
Location: Frankfurt, Hesse, Germany
Job Type: Hybrid (Stuttgart & Frankfurt)
Category: IT Infrastructure & Networking
Date Posted: July 30, 2025
Experience Level: Mid-Senior Level (2-5 years)
Remote Status: On-site (with mobile working option)

🚀 Role Summary

Maintain and manage network infrastructure for a leading international consulting and engineering firm.
Collaborate with cross-functional teams to ensure high network availability and performance.
Contribute to innovative network strategies and architecture development.
Provide second-level support and troubleshoot network issues.
Monitor and optimize network performance using modern network management tools.

📝 Enhancement Note: This role requires a strong focus on teamwork, communication, and customer service, as you'll be supporting both internal and external clients. Your ability to work independently and proactively manage network performance will be crucial for success.

💻 Primary Responsibilities

Network Infrastructure Management: Operate and maintain network infrastructures, including Cisco, LAN, WLAN, and ISE, ensuring high availability and performance.
Project Implementation: Plan, implement, and configure new systems independently, with a focus on stable and highly available network operations.
Innovative Network Strategies: Develop and implement innovative network strategies and architectures to meet business needs.
Technical Support: Serve as a point of contact for technical questions and troubleshoot network issues from the second-level support.
Network Performance Optimization: Monitor network performance proactively, ensuring communication performance, recoverability, and network security through continuous optimization.
Network Analysis & Diagnostics: Conduct detailed network analyses and diagnostics using modern network management tools to identify and resolve issues, and plan for capacity.
AudioCodes Session Border Controllers (SBC) Management: Manage a decentralized, modern communication infrastructure based on AudioCodes SBCs.

📝 Enhancement Note: Your ability to analyze complex network issues, troubleshoot, and optimize performance will be essential for success in this role. Familiarity with network management tools and a proactive approach to network monitoring will be highly valued.

🎓 Skills & Qualifications

Education: A degree in computer science, IT, or a related field, or relevant professional experience.

Experience: At least three years of experience in network administration, with a focus on Cisco, routing, switching, and firewalling.

Required Skills:

Proficient in Cisco network administration (CCNA certification is a plus)
Strong knowledge of Microsoft and Linux operating systems
Experience with SIEM and UC systems
Familiarity with Microsoft Teams, SIP, and SBCs (AudioCodes)
Excellent analytical and problem-solving skills
Strong communication and teamwork skills
Fluent in German and English, both written and spoken

Preferred Skills:

Experience with network management tools
Knowledge of scripting languages (e.g., Python, PowerShell)
Familiarity with cloud-based networking (e.g., AWS, Azure, or GCP)
Certifications in network administration (e.g., CCNA, CCNP)

📝 Enhancement Note: While not required, certifications in network administration and experience with cloud-based networking can significantly enhance your competitiveness for this role. Familiarity with scripting languages can also be beneficial for automating network tasks and improving efficiency.

📊 Web Portfolio & Project Requirements

Portfolio Essentials:

Document your experience with network infrastructure management, focusing on Cisco, routing, switching, and firewalling.
Highlight your ability to troubleshoot complex network issues and optimize performance using modern network management tools.
Demonstrate your experience with SIEM, UC systems, Microsoft Teams, SIP, and SBCs (AudioCodes).
Showcase your understanding of network security principles and best practices.

Technical Documentation:

Provide detailed documentation of your network infrastructure projects, including network diagrams, configuration files, and troubleshooting steps.
Include case studies demonstrating your ability to analyze network performance, identify bottlenecks, and implement optimizations.
Highlight your experience with network management tools and any scripting or automation you've used to streamline network administration tasks.

📝 Enhancement Note: Tailor your portfolio to the specific network infrastructure requirements of this role, emphasizing your experience with Cisco, routing, switching, firewalling, and network management tools. Include examples of your ability to troubleshoot complex network issues and optimize performance.

💵 Compensation & Benefits

Salary Range: €50,000 - €70,000 per year (gross), depending on experience and qualifications. This estimate is based on market research for mid-senior level network administrator roles in Frankfurt, Germany.

Benefits:

Mobile working option to balance work and life
Individual training and development opportunities through the Drees & Sommer Academy
Health support, including a bonus for sports activities or a gym membership subsidy
Sustainable mobility options, such as job bike leasing, public transportation subsidies, or company cars (depending on the position)
Attractive corporate benefits, including discounts and a employee referral program with attractive rewards
Childcare subsidies and additional benefits for special private events

Working Hours: Full-time position with standard working hours (usually 8:00 AM - 5:00 PM, Monday to Friday). Some flexibility may be available for deployment windows and maintenance tasks.

📝 Enhancement Note: The salary range provided is an estimate based on market research for mid-senior level network administrator roles in Frankfurt, Germany. Actual compensation may vary depending on the candidate's qualifications and experience.

🎯 Team & Company Context

🏢 Company Culture

Industry: Drees & Sommer is a leading international consulting and engineering firm, focusing on sustainable and innovative solutions for the real estate, infrastructure, and energy sectors.

Company Size: Medium to large (6,000+ employees worldwide)

Founded: 1970

Team Structure:

The IT team consists of various departments, including network administration, which is responsible for maintaining and managing network infrastructures.
The network administration team works closely with other IT departments, as well as with internal and external clients, to ensure high network availability and performance.
The team is structured hierarchically, with team leaders and managers providing guidance and support to team members.

Development Methodology:

Agile methodologies are used for project management, with a focus on continuous improvement and collaboration.
Network administrators work closely with other IT teams to ensure that network infrastructure projects are delivered on time and within budget.
Regular code reviews, testing, and quality assurance processes are in place to ensure the delivery of high-quality network solutions.

Company Website: https://www.dreso.com/

📝 Enhancement Note: Drees & Sommer's focus on sustainability and innovation makes it an attractive employer for network administrators interested in working on cutting-edge projects that have a positive impact on the environment and society.

📈 Career & Growth Analysis

Network Administrator Career Level: Mid-Senior Level

Responsible for the day-to-day management of network infrastructures, including Cisco, LAN, WLAN, and ISE.
Collaborates with internal and external clients to ensure high network availability and performance.
Implements innovative network strategies and architectures to meet business needs.
Troubleshoots network issues and optimizes network performance using modern network management tools.

Reporting Structure: Reports directly to the team leader or manager of the network administration department.

Technical Impact: Has a significant impact on the company's network infrastructure, ensuring high availability, performance, and security. Contributes to the development of innovative network strategies and architectures.

Growth Opportunities:

Technical Growth: Deepen your expertise in network administration, with a focus on Cisco, routing, switching, and firewalling. Explore emerging technologies and trends in network infrastructure to stay up-to-date and expand your skillset.
Leadership Development: Develop your leadership skills by taking on more complex projects, mentoring junior team members, and contributing to strategic decision-making processes.
Architecture & Design: Expand your role to include network architecture and design, working closely with other IT teams to develop and implement network strategies that meet business needs.

📝 Enhancement Note: Drees & Sommer offers excellent opportunities for career growth and development, with a focus on technical expertise, leadership, and architecture. Network administrators can expect to work on challenging and innovative projects that have a significant impact on the company's network infrastructure.

🌐 Work Environment

Office Type: Modern, collaborative office spaces with a focus on sustainability and employee well-being.

Office Location(s): Stuttgart and Frankfurt, Germany

Workspace Context:

Collaborative Workspace: The network administration team works closely with other IT teams and internal/external clients, fostering a collaborative and inclusive work environment.
Technical Workspace: Network administrators have access to modern hardware, software, and tools to perform their jobs effectively, including network management tools, virtualization platforms, and cloud-based services.
Team Interaction: The network administration team works closely with other IT teams, such as system administration, database administration, and software development, to ensure seamless integration and collaboration.

Work Schedule: Full-time position with standard working hours (usually 8:00 AM - 5:00 PM, Monday to Friday). Some flexibility may be available for deployment windows and maintenance tasks.

📝 Enhancement Note: Drees & Sommer's focus on sustainability and employee well-being creates a modern and collaborative work environment that fosters innovation and creativity. Network administrators can expect to work in a dynamic and inclusive team setting, with access to modern hardware, software, and tools.

📄 Application & Technical Interview Process

Interview Process:

Online Assessment: Complete an online assessment to evaluate your technical skills and problem-solving abilities. This may include network infrastructure scenarios, troubleshooting exercises, and multiple-choice questions.
Technical Phone/Skype Interview: Discuss your technical background, experience, and motivation for the role. Be prepared to answer questions about your experience with Cisco, routing, switching, firewalling, and network management tools.
On-site Interview: Meet with the hiring manager and team members to discuss your technical skills, cultural fit, and career goals. Be prepared to present your portfolio and discuss your approach to network infrastructure management, troubleshooting, and optimization.
Final Evaluation: The hiring manager will evaluate your performance throughout the interview process and make a final decision based on your technical skills, cultural fit, and career aspirations.

Portfolio Review Tips:

Highlight your experience with Cisco, routing, switching, firewalling, and network management tools.
Include case studies demonstrating your ability to troubleshoot complex network issues and optimize performance.
Showcase your understanding of network security principles and best practices.
Tailor your portfolio to the specific network infrastructure requirements of this role, emphasizing your experience with Cisco, routing, switching, firewalling, and network management tools.

Technical Challenge Preparation:

Brush up on your knowledge of Cisco, routing, switching, firewalling, and network management tools.
Practice network troubleshooting exercises and scenarios to improve your problem-solving skills.
Familiarize yourself with the latest trends and best practices in network infrastructure management.

ATS Keywords: Cisco, network administration, routing, switching, firewalling, network management, SIEM, UC systems, Microsoft Teams, SIP, SBCs, AudioCodes, network performance optimization, network security, Agile methodologies, cloud-based networking, scripting languages.

📝 Enhancement Note: Drees & Sommer's interview process is designed to evaluate your technical skills, problem-solving abilities, and cultural fit. By preparing for each stage of the interview process and tailoring your portfolio to the specific network infrastructure requirements of this role, you can increase your chances of success.

🛠 Technology Stack & Web Infrastructure

Network Infrastructure:

Cisco network infrastructure, including routers, switches, and wireless access points
LAN and WLAN networks, with a focus on high availability and performance
ISE (Identity Services Engine) for network access control and security
WAN connectivity, including MPLS, VPN, and internet access
AudioCodes Session Border Controllers (SBCs) for secure and reliable VoIP communication

Network Management Tools:

Cisco Prime Infrastructure for network management, monitoring, and automation
SolarWinds Network Performance Monitor for network performance monitoring and diagnostics
Nagios for network monitoring and alerting
Zabbix for network monitoring and automation

Server & Storage Infrastructure:

Virtualization platforms, including VMware vSphere and Microsoft Hyper-V
Cloud-based storage and computing services, including AWS, Azure, and Google Cloud Platform
On-premises storage and server infrastructure, including Dell EMC and HPE

📝 Enhancement Note: Drees & Sommer's network infrastructure is built on Cisco technology, with a focus on high availability, performance, and security. Network administrators can expect to work with modern network management tools and virtualization platforms to ensure seamless and efficient network operations.

👥 Team Culture & Values

Network Administrator Values:

Customer Focus: Prioritize the needs and expectations of internal and external clients, ensuring high network availability and performance.
Innovation: Embrace new technologies and trends in network infrastructure to drive continuous improvement and optimization.
Collaboration: Work closely with other IT teams and internal/external clients to ensure seamless integration and collaboration.
Reliability: Ensure high network availability and performance through proactive monitoring, troubleshooting, and optimization.
Security: Implement and maintain network security principles and best practices to protect the company's assets and data.

Collaboration Style:

Cross-Functional Collaboration: Work closely with other IT teams, such as system administration, database administration, and software development, to ensure seamless integration and collaboration.
Code Review Culture: Participate in regular code reviews and knowledge-sharing sessions to ensure high-quality network solutions and continuous learning.
Mentoring & Knowledge Sharing: Share your expertise and experience with junior team members to foster a culture of continuous learning and development.

📝 Enhancement Note: Drees & Sommer's network administration team values customer focus, innovation, collaboration, reliability, and security. By embracing these values and working closely with other IT teams and internal/external clients, network administrators can contribute to the company's success and drive continuous improvement and optimization.

⚡ Challenges & Growth Opportunities

Technical Challenges:

Network Performance Optimization: Identify and address network bottlenecks and performance issues to ensure high availability and responsiveness.
Network Security: Implement and maintain network security principles and best practices to protect the company's assets and data from cyber threats.
Emerging Technologies: Stay up-to-date with the latest trends and best practices in network infrastructure, including software-defined networking (SDN) and network functions virtualization (NFV).
Cloud-Based Networking: Expand your expertise in cloud-based networking, including AWS, Azure, and Google Cloud Platform, to support the company's hybrid and multi-cloud strategy.

Learning & Development Opportunities:

Technical Training: Participate in technical training and certification programs to deepen your expertise in network administration, including Cisco, routing, switching, firewalling, and network management tools.
Conferences & Events: Attend industry conferences and events to network with other professionals, learn about emerging technologies, and share best practices.
Mentoring & Coaching: Seek mentorship and coaching opportunities from experienced network administrators and other IT professionals to enhance your skills and career development.

📝 Enhancement Note: Drees & Sommer's network administration team faces a range of technical challenges, from network performance optimization and security to emerging technologies and cloud-based networking. By embracing these challenges and seeking out learning and development opportunities, network administrators can drive continuous improvement and optimization, as well as enhance their careers.

💡 Interview Preparation

Technical Questions:

Network Infrastructure: Describe your experience with Cisco network infrastructure, including routers, switches, and wireless access points. How have you ensured high availability and performance in your previous roles?
Routing & Switching: Explain your understanding of routing and switching protocols, including OSPF, BGP, and Spanning Tree Protocol (STP). How have you optimized network performance and reduced latency in your previous roles?
Firewalling & Security: Discuss your experience with firewalling and network security principles. How have you protected network infrastructure from cyber threats in your previous roles?
Network Management Tools: Describe your experience with network management tools, such as Cisco Prime Infrastructure, SolarWinds Network Performance Monitor, Nagios, and Zabbix. How have you used these tools to monitor and optimize network performance?

Company & Culture Questions:

Company Culture: How do you align with Drees & Sommer's values and culture, particularly in relation to sustainability, innovation, and customer focus?
Team Collaboration: Describe your experience working in a collaborative team environment. How have you ensured seamless integration and collaboration with other IT teams and internal/external clients?
Problem-Solving: Provide an example of a complex network issue you've faced in a previous role and how you approached troubleshooting and resolution. How did you ensure that the network remained stable and available during the process?

Portfolio Presentation Strategy:

Network Infrastructure: Highlight your experience with Cisco network infrastructure, including routers, switches, and wireless access points. Showcase your ability to design, implement, and manage network infrastructure projects that meet business needs.
Network Performance Optimization: Demonstrate your ability to analyze network performance, identify bottlenecks, and implement optimizations using modern network management tools.
Network Security: Showcase your understanding of network security principles and best practices, including firewalling, intrusion prevention, and access control. Highlight your experience implementing and maintaining network security measures in previous roles.
Emerging Technologies: Discuss your familiarity with emerging technologies in network infrastructure, such as software-defined networking (SDN) and network functions virtualization (NFV). Explain how you've stayed up-to-date with the latest trends and best practices in network administration.

📝 Enhancement Note: Drees & Sommer's interview process is designed to evaluate your technical skills, problem-solving abilities, and cultural fit. By preparing for technical questions, company and culture questions, and portfolio presentation strategies, you can increase your chances of success in the interview process.

📌 Application Steps

To apply for this IT Network Administrator/ IT Network Engineer (w/m/d) position at Drees & Sommer SE:

Update Your Resume: Tailor your resume to highlight your experience with Cisco, routing, switching, firewalling, and network management tools. Include specific examples of network infrastructure projects, troubleshooting, and optimization.
Prepare Your Portfolio: Tailor your portfolio to the specific network infrastructure requirements of this role, emphasizing your experience with Cisco, routing, switching, firewalling, and network management tools. Include case studies demonstrating your ability to troubleshoot complex network issues and optimize performance.
Research the Company: Familiarize yourself with Drees & Sommer's values, culture, and industry focus on sustainability and innovation. Prepare for company and culture questions by reflecting on your alignment with the company's mission and values.
Practice Technical Interview Questions: Brush up on your knowledge of Cisco, routing, switching, firewalling, and network management tools. Practice network troubleshooting exercises and scenarios to improve your problem-solving skills. Familiarize yourself with the latest trends and best practices in network infrastructure management.

📝 Enhancement Note: By following these application steps and tailoring your resume, portfolio, and interview preparation to the specific network infrastructure requirements of this role, you can increase your chances of success in the IT Network Administrator/ IT Network Engineer (w/m/d) position at Drees & Sommer SE.

IT Netzwerk Administrator/ IT Network Engineer (w/m/d)