ArcSight SIEM Engineer; DV Security Clearance

Overview

At CGI, we’re redefining how technology protects the nation. As an Arc Sight SIEM Engineer, you’ll play a vital role in a major defence programme—modernising secure data platforms, driving automation, and strengthening the UK’s cyber resilience. Working at the forefront of national security, you’ll design and support cutting-edge systems that enable faster, smarter threat detection and decision-making. You’ll be part of a close-knit team that thrives on collaboration, innovation, and technical excellence—where you’ll have the freedom to take ownership of your work, the opportunity to create lasting impact, and the support of a global organisation committed to your growth.

CGI was recognised in the Sunday Times Best Places to Work List 2025 and has been named a UK ‘Best Employer’ by the Financial Times. We offer a competitive salary, excellent pension, private healthcare, plus a share scheme (3.5% + 3.5% matching) which makes you a CGI Partner not just an employee. We are committed to inclusivity, building a genuinely diverse community of tech talent and inspiring everyone to pursue careers in our sector, including our Armed Forces, and are proud to hold a Gold Award in recognition of our support of the Armed Forces Corporate Covenant.

Join us and you’ll be part of an open, friendly community of experts. We’ll train and support you in taking your career wherever you want it to go.

Due to the secure nature of the programme, you will need to hold UK Security Clearance or be eligible to go through this clearance. This is a full-time onsite position in Basingstoke (no hybrid/remote working).

In this role, you will be instrumental in modernising and maintaining key defence platforms, ensuring data collection and analysis systems are secure, efficient, and future-ready. Working within a collaborative client-site environment, you will develop, configure, and optimise Arc Sight SIEM toolsets, ensuring the seamless integration of new capabilities to support national security operations. You will also automate release and deployment processes to improve quality and delivery speed, while maintaining rigorous standards for documentation and compliance.

• Develop & Optimise:
  Modernise data collection, processing, and storage systems using tools like Kafka, Kubernetes, and Zookeeper.
• Automate & Enhance:
  Streamline and automate release processes with Ansible and Azure Dev Ops for greater reliability and quality.
• Configure & Maintain:
  Support, configure, and troubleshoot Arc Sight SIEM components, including filters, Smart Connectors, and ESM.
• Collaborate & Align:
  Liaise with internal teams to translate security requirements into effective technical solutions.
• Document & Support:
  Create and maintain detailed technical and support documentation for ongoing system improvements.

You should bring a strong foundation in systems engineering, a proactive approach to automation and security, and hands-on experience with Arc Sight or SIEM technologies. A background in Dev Ops, data engineering, or infrastructure modernisation will help you thrive in this environment.

• Proven experience with Arc Sight SIEM configuration, support, and troubleshooting
• Strong knowledge of RHEL and Windows environments
• Experience automating releases via Ansible and Azure Dev Ops
• Familiarity with Kafka, Kubernetes, and distributed systems
• Strong written and verbal communication skills
• Understanding of data engineering (SQL or Big Data)
• Scripting ability (Power Shell, Bash) advantageous
• Active HLC/DV clearance required