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We are looking for a Senior Security Engineer with demonstrated expertise across enterprise security engineering, Microsoft Azure and on-premises infrastructure protection, incident response, and compliance frameworks including ISO 27001:2022 and CMMC. This role requires hands-on technical execution alongside architectural oversight — you will design and operate security controls, drive threat detection capabilities, and own compliance program delivery end-to-end. Security operations must align with NATO cybersecurity standards and requirements.Key Responsibilities<ul><li>Security Engineering &amp; Architecture</li></ul>Design and operationalize enterprise security controls spanning network, endpoint, cloud, and application layers. Lead security architecture reviews for new systems and infrastructure. Implement Zero Trust architectures, network segmentation, IAM, MFA, and least-privilege access models across Microsoft Azure and on-premises/local resource environments. Ensure security configurations align with NATO security standards and requirements.<ul><li>Threat Detection &amp; Incident Response</li></ul>Develop and tune SIEM detection logic, correlation rules, and alerting pipelines. Lead investigation and containment of security incidents including phishing, malware, unauthorized access, and data exfiltration. Own post-incident reviews, root cause analysis, and remediation tracking. Perform digital forensics as required.<ul><li>Vulnerability Management</li></ul>Operate vulnerability scanning programs using tools such as Nessus, Qualys, or Tenable. Conduct risk assessments, prioritize findings by exploitability and business impact, and drive remediation with IT and DevOps teams. Track patching cadence and configuration hardening progress.<ul><li>DevSecOps &amp; Automation</li></ul>Integrate security controls into CI/CD pipelines. Develop automation using Python, Bash, PowerShell, or Terraform for security operations, alerting, and remediation workflows. Implement secrets management, SAST/DAST scanning, and container security controls.<ul><li>CMMC &amp; ISO 27001:2022 Compliance</li></ul>Lead implementation and operational alignment with ISO 27001:2022, including Annex A control mapping, ISMS policy and procedure ownership, internal and external audit coordination, and management reviews. Support CMMC assessment readiness, including control gap analysis, evidence collection, corrective action tracking, and continuous improvement activities. Ensure ongoing compliance with applicable regulatory, contractual, NATO, and customer cybersecurity requirements.<ul><li>Technical Leadership</li></ul>Mentor junior engineers and analysts. Provide technical leadership across security projects and incident response efforts. Collaborate cross-functionally with Engineering, IT, Product, and Leadership on security-by-design initiatives. Work closely with IT and external consultants to achieve security targets and program objectives.Required Qualifications&nbsp;<ul><li>5+ years in cybersecurity engineering or security operations roles</li><li>Strong proficiency in network security fundamentals: firewalls, IDS/IPS, VPN, DNS, TCP/IP</li><li>Hands-on experience with SIEM platforms (Splunk, Microsoft Sentinel, QRadar, or Elastic)</li><li>Deep knowledge of Windows, Linux, Active Directory, Microsoft Azure, and local on-premises infrastructure security</li><li>Practical experience with vulnerability management tools (Nessus, Qualys, or Tenable)</li><li>Demonstrated experience implementing or auditing ISO 27001 ISMS frameworks</li><li>Working knowledge of CMMC or equivalent cybersecurity maturity frameworks</li><li>Familiarity with NATO cybersecurity standards and information security requirements</li><li>Scripting proficiency in Python, PowerShell, or Bash</li><li>Experience with IAM, MFA, SSO, and RBAC implementations</li><li>Strong analytical reasoning and documented written communication skills</li></ul>

Senior Security Engineer

Are you a dynamic and results-driven Project Manager with a passion for security systems? G4S, as part of Allied Universal, the world's leading security services provider, is expanding its team in Metamorphosis, Attica, Greece, and we're seeking a talented individual to join our Installations &amp; Large Projects Team.As a Project Manager, you'll play a pivotal role in ensuring the successful delivery of complex security projects. You'll coordinate people, processes, and resources to achieve on-time, within-budget, and high-quality project outcomes.Responsibilities:<ul><li>Project Leadership:<ul><li>Manage end-to-end project lifecycles, from planning and execution to completion</li><li>Develop comprehensive project plans, defining scope, timelines, and budgets</li><li>Proactively identify and mitigate project risks</li><li>Monitor and control project progress, ensuring adherence to quality and safety standards</li></ul></li><li>Stakeholder Management:<ul><li>Build and maintain strong relationships with clients, subcontractors, and internal teams</li><li>Effectively communicate project status and updates to all stakeholders</li></ul></li><li>Operational Excellence:<ul><li>Optimize resource allocation and utilization</li><li>Maintain accurate project documentation and reporting</li><li>Contribute to continuous improvement initiatives</li></ul></li><li>Coordination:<ul><li>Oversee the coordination of installation and commissioning of security systems</li><li>Manage subcontractor performance and quality</li></ul></li></ul>Job requirementsQualifications:<ul><li>3 years of experience as a Project Manager, ideally within the security or engineering sectors</li><li>Understanding of security systems and infrastructure networks (or a willingness to learn)</li><li>Proven ability to manage complex projects and deliver results</li><li>Excellent communication, interpersonal, and negotiation skills</li><li>Proficiency in MS Office and Google Workspace</li><li>Fluency in Greek and English</li><li>PMP or PRINCE II certification (Preferred)</li><li>Attention to detail and strong organizational skills</li></ul>We Offer:<ul><li>Competitive salary and performance-based bonus</li><li>Comprehensive private health and life insurance</li><li>Company vehicle and travel expense coverage</li><li>Ongoing professional development and training</li><li>Opportunities for global career advancement</li><li>Dynamic and collaborative work environment</li></ul>G4S is committed to Equal Employment Opportunity! If you correspond to the above criteria please don’t hesitate to click the Apply button and send us your resume.

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