System Engineer Domain Expert

28/10/2025

Our client is looking for a System Engineer (Domain Expert)

Project Description

The IT Infrastructure department is looking for a System Engineer (Domain Expert) to join the application team. This team is responsible for:

  • Deploying all in-house developed applications in acceptance and production environments
  • Managing system architecture
  • Capacity planning
  • Performance tuning of core shared applications and middleware (e.g. Microsoft SQL Server, MongoDB, RabbitMQ)

Responsibilities

  • Deploy and manage infrastructure for in-house developed applications in acceptance and production environments (including Windows IIS & SQL-based systems)
  • Participate in design and architectural discussions for new application deployments
  • Analyze requirements, drive design, and oversee setup/deployment of applications
  • Interface with technical clients to clarify requests and provide solutions
  • Provide escalated troubleshooting and root cause analysis for complex system issues
  • Configure F5 load balancing VIPs for web applications and optimize overall system performance
  • Support implementations of core applications: RabbitMQ, Redis Cache, and other shared technologies
  • Provide optimal 2nd/3rd level support (interface with Microsoft and other third parties)
  • Maintain documentation for system architectures and operational policies
  • Participate in the duty role (24/7, 1 week every 6 weeks)

Requirements

  • Fluent in English and either French or Dutch (English is mandatory for documentation and international meetings)
  • Recent experience in system administration and support on Windows Server (2012–2022)
  • Knowledge of Linux distributions (preferably RedHat) is a plus
  • Proven knowledge of IIS management, website deployments, and system integration
  • Experience with PowerShell and scripting in Windows and Linux environments (Bash/Python)
  • In-depth knowledge of MS-SQL, MongoDB, RabbitMQ, NEO4J or Redis Cache is a plus (on-site coaching/training will be provided)
  • Strong understanding of network protocols, VLANs, DNS, proxies, firewalls, and network load balancing
  • Strong understanding of security: passwords, ciphers, secret keys, TLS/SSL protocols, and encryption methods

Soft Skills

  • Team-oriented, yet capable of working independently
  • Strong troubleshooting skills for complex system architectures
  • Ability to analyze stakeholder requests and evaluate possible solutions
  • Ability to identify risks and propose mitigation strategies
  • Strategic mindset with strong stakeholder focus
  • Eager to learn new technologies (mastery expected within one year)
  • Capable of transferring knowledge to team members
  • Clear verbal and written communication skills

Practical Information

  • Location: Brussels (Schaerbeek), with occasional travel to Berlin (travel expenses covered)
  • Telework: 60% remote, 40% on-site
  • Duty role: 24/7, 1 week every 6 weeks
  • Driver’s license and car required (for duty role)
  • Mobile phone required
  • Start date: As soon as possible
  • Duration: 1 year (extendable)

 

Job specifications

ID: 11478

Duration: 01/12/2025 - 31/03/2026

Location: Brussels

Type: Freelance

Joël De Ben

IT Recruitment Consultant
This position is no longer accepting applications.