Senior Infrastructure

ATS4IT supports its clients in their digital transformation initiatives and AI driven innovations, in different sectors and it's a part MoOngy Group, with over 9,500 employees across Europe, we bring extensive expertise across a wide range of IT domains. With teams in Belgium, Denmark, and a nearshore center in Portugal, we deliver proximity, agility, and real impact across Europe.

Senior Infrastructure / Linux Security Engineer

Location: Brussels (Hybrid)

Languages: C2 English

Nice to Have: French

Due to project-specific security and compliance requirements, only EU citizens are eligible to apply for this position.

About The Role

We are looking for an experienced Senior Infrastructure / Linux Security Engineer to join a dynamic team responsible for securing, maintaining, and evolving critical Linux-based infrastructure environments. The ideal candidate combines strong expertise in Linux administration, infrastructure security, vulnerability management, automation, and cloud technologies, with a proactive approach to ensuring system reliability and security.

Profile

• Bachelor's or Master's degree in Computer Science, Cybersecurity, Information Technology, or a related field.
• More than 10 years of experience in Infrastructure Engineering, Linux Administration, or IT Security.
• Strong analytical and troubleshooting skills.
• Excellent communication and collaboration abilities.
• Ability to work effectively in Agile and cross-functional environments.
• Security-focused mindset with a commitment to continuous improvement and operational excellence.

Requirements

Mandatory

• 10+ years of experience in Linux Infrastructure and Security.
• Strong expertise with Red Hat Enterprise Linux (RHEL) and Linux system administration.
• Experience with system hardening, vulnerability management, and patch management.
• Strong knowledge of Identity & Access Management (IAM) concepts.
• Experience with SIEM solutions, log analysis, and security monitoring.
• Good understanding of network security, firewalls, and secure communication protocols.
• Experience with shell scripting and automation.
• Knowledge of security frameworks and compliance standards.
• Experience investigating and resolving security incidents.

Strongly Preferred

• Experience with Microsoft Defender, CrowdStrike, Splunk, Elastic, or similar security platforms.
• Experience with Docker and container security.
• Experience working with AWS and/or Azure environments.
• Knowledge of Ansible, Terraform, or Infrastructure-as-Code practices.
• Experience with endpoint protection and vulnerability assessment tools.
• Knowledge of Zero Trust and modern security architectures.

Nice to Have

• French language skills.
• Security certifications such as Security+, CISSP, CEH, or equivalent.
• Experience with Kubernetes security.
• Experience in highly regulated or enterprise environments.

Key Responsibilities

• Manage, secure, and optimize Linux-based infrastructure environments.
• Monitor security events and investigate potential threats and incidents.
• Implement security controls, hardening standards, and vulnerability remediation plans.
• Maintain patching and update processes across infrastructure platforms.
• Automate operational and security-related tasks.
• Collaborate with infrastructure, cloud, and security teams to improve platform resilience.
• Support security audits, compliance initiatives, and risk assessments.
• Contribute to incident response and root cause analysis activities.
• Improve monitoring, logging, and threat detection capabilities.
• Promote security best practices across the organization.

Technical Environment

• Red Hat Enterprise Linux (RHEL)
• Linux Administration
• IAM
• SIEM
• Splunk / Elastic
• Microsoft Defender
• CrowdStrike
• Vulnerability Management
• Docker
• Bash / Shell Scripting
• Ansible / Terraform
• AWS and/or Azure
• Security Monitoring & Incident Response
• Agile/Scrum

What We Offer

• Permanent Contract (CDI)- Long-term stability.
• Attractive salary based on your experience and skills.
• Additional benefits: Meal vouchers and eco-vouchers (electronic), DKV hospitalization insurance, company laptop, holiday allowance, and year-end bonus.
• Free training (technical, behavioral, language) and certifications.
• Continuous and personalized career progression support.
• Opportunities to work on projects with cutting-edge technologies.

At Moong