Senior System Administrator – Secure Messaging EA- 1360

NAXCON GmbH, headquartered in Weil am Rhein with additional offices, including Stuttgart, is one of Germany's leading engineering and IT service providers.

Our experts possess extensive expertise in software and hardware development, modern electronics, and cutting-edge technologies such as Artificial Intelligence (AI).

In addition to delivering high-quality engineering solutions for our customers, we are passionate about driving our own innovation projects as well as research and development activities. Renowned companies from a wide range of industries place their trust in our expertise, reflecting the outstanding knowledge, professionalism, and commitment of our engineers.

Position: Senior System Administrator – Secure Messaging

Location: Berlin, Germany

Field: Defence

Type: Full-time / 50-75% Remote

Project and Service Environment

The position is part of a secure messaging operations team responsible for providing and operating the backend infrastructure of a Matrix protocol-based enterprise messenger platform.

The team ensures the stable, secure, and highly available operation of the messaging environment. Its responsibilities include maintaining backend components, ensuring the availability of functions and interfaces, performing cross-functional incident analysis, and providing second-level support.

A current focus of the team is the automation of operational processes and the improvement of root-cause analysis during live operations.

Responsibilities

The Senior System Administrator will be responsible for:

• Installing, configuring, commissioning, administering, and monitoring the secure messaging infrastructure.

• Operating the infrastructure in accordance with current security requirements and internal operational standards.

• Administering Red Hat-based Linux servers.

• Performing advanced troubleshooting and root-cause analysis in live production environments.

• Monitoring the availability, performance, capacity, and threshold values of IT services and infrastructure resources.

• Taking corrective action in the event of performance bottlenecks or availability issues.

• Supporting the achievement of agreed service levels and operational targets.

• Updating, maintaining, and improving technical and operational documentation.

• Automating recurring operational processes using technologies such as Ansible, Bash, and PowerShell.

• Implementing approved infrastructure changes within established change and release management processes.

• Following standard operating procedures during releases, deployments, and configuration changes.

• Recording infrastructure changes in the relevant configuration management databases.

• Analysing and resolving incidents and service requests escalated by first-level support.

• Performing detailed remote troubleshooting to identify underlying technical causes.

• Communicating with affected users or stakeholders when further information or coordination is required.

• Documenting solutions and troubleshooting procedures in the knowledge base.

• Supporting continuous improvement of operational procedures, automation workflows, and incident analysis methods.

• Working with infrastructure, network, security, application, and support teams to resolve cross-functional technical issues.

Required Qualifications

The candidate should have:

• Successfully completed vocational training or a university degree in information technology, computer science, system integration, or a comparable discipline.

• Alternatively, at least five years of relevant professional experience supported by suitable technical qualifications.

• A valid IT service management certification at ITIL Foundation level.

• A valid Linux administration certification at LPIC-1 level or higher.

• Relevant certificates must be valid at the time of application.

• Equivalent evidence may be accepted where formal certificates cannot be provided, provided that equivalence can be demonstrated.

Required Professional Experience

The candidate must have:

• At least five years of professional experience in system administration.

• At least five years of substantial practical experience with Linux systems and network technologies.

• At least two years of practical experience administering Matrix-based messenger platforms.

• At least two years of practical experience with infrastructure and operations automation using Ansible, Bash, PowerShell, or comparable tools.

• Experience administering Red Hat or comparable enterprise Linux environments.

• Experience operating business-critical or security-sensitive backend services.

• Experience with availability, performance, capacity, and service-level monitoring.

• Experience with incident, problem, change, release, and configuration management.

• Experience handling second-level support tickets and complex technical escalations.

• Experience maintaining configuration data, technical documentation, and knowledge base articles.

• Experience coordinating technical issues across infrastructure, network, security, application, and support teams.

The required experience should represent continuous, repeated, and substantial work in the relevant subject area rather than isolated or occasional assignments.

Technical Skills

• Linux administration

• Red Hat Enterprise Linux

• Matrix protocol

• Matrix-based messenger administration

• Secure messaging infrastructure

• Network fundamentals and troubleshooting

• Ansible

• Bash scripting

• PowerShell

• Infrastructure automation

• System monitoring

• Capacity management

• Availability management

• Performance monitoring

• Threshold monitoring

• Incident management

• Problem management

• Root-cause analysis

• Change management

• Release management

• Configuration management

• Configuration management databases

• Second-level support

• Remote troubleshooting

• Knowledge base management

• Technical documentation

• IT service management

• ITIL processes

• Security-conscious system operation

Language Requirements

• German: C1 according to CEFR

Native German speakers do not need to provide separate language certification. For other candidates, the language level should be demonstrated through the CV and a recognised certificate or equivalent evidence.

Required Soft Skills

The candidate should demonstrate:

• Strong ability to explain complex technical topics clearly and understandably.

• Excellent structured troubleshooting and root-cause thinking.

• High quality awareness.

• Strong accuracy and attention to detail.

• A systematic and analytical working style.

• Ability to work independently in production environments.

• Strong documentation discipline.

• Clear and professional communication with users, technical teams, and stakeholders.

• Ability to remain calm and solution-oriented during incidents and service disruptions.

• Strong collaboration skills across different technical disciplines.

• Reliability when implementing changes in security-sensitive environments.

Travel and Working Model

• Willingness to travel for up to approximately 10% of working time is required.

• Travel may be undertaken by private car, rental car, train, or other public transport.

• The expected remote-working proportion is approximately 50–75%, depending on operational requirements.

• On-site presence may be required for commissioning, troubleshooting, releases, security-related activities, workshops, or team coordination.

Security-Related Requirements

• Candidate profiles must include nationality information.

• Applicable security-related country-list restrictions must be observed.

• Country-specific travel or security restrictions may apply even where no formal security clearance is required.

• Eligibility for deployment in a security-sensitive environment must be confirmed before assignment.

• Failure to meet the applicable security requirements may result in exclusion from the recruitment process.

Project Reference Requirements

Where project references are required, each reference should include:

• Industry

• Project title

• Short project description

• Duration of the candidate's assignment

• Detailed description of the candidate's responsibilities and activities

• Linux and network administration scope

• Matrix-based messenger administration experience

• Automation activities using Ansible, Bash, PowerShell, or comparable technologies

• Incident, change, release, and configuration management responsibilities

• Second-level support and troubleshooting activities

What we offer:

• International Working Environment: Join a diverse and multicultural team where people from different backgrounds and cultures collaborate to achieve outstanding results.
• German Language Development: Whether you are a beginner or an advanced speaker, we provide a supportive environment to help you improve your German language skills.
• Dedicated Point of Contact: You will have a personal contact within the company who will support and guide you throughout your employment.
• Professional Growth: Our engineers have the opportunity to work on exciting projects across different industries, continuously expanding their expertise and developing new skills.
• Regular Team Events: We organize regular company events to strengthen team spirit, encourage collaboration, and create a positive working atmosphere.
• Competitive Compensation: We value our employees and offer an attractive compensation package that reflects your qualifications, experience, and performance.

Note:

• Travel expenses for on-site interviews are covered by the candidates themselves