Data Engineer (DV Security Clearance)
At CGI, you'll help protect critical systems by designing and operating data pipelines that enable real-time security insight across complex defence environments. Working on a secure programme, you'll take ownership of on-premise data ingestion and processing solutions that underpin a SIEM platform built on the Elastic Stack. You'll collaborate closely with security and infrastructure specialists, apply creative problem-solving to diverse log sources, and continuously improve how data is captured, enriched and analysed. 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. Due to the secure nature of the programme, you will need to hold UK Security Clearance or be eligible to go through this clearance. In this role, you will design, build and maintain on-premise data ingestion and processing pipelines that feed a SIEM platform used for real-time security monitoring and analytics. You'll take responsibility for ensuring critical log sources are reliably parsed, normalised and enriched, enabling high-quality data to support operational and security decision-making. Working alongside security, operations and infrastructure teams, you'll onboard new data sources, improve existing pipelines and help shape standards across the platform.
You will also contribute to the long-term robustness and performance of the data platform by documenting designs, improving data flows and supporting operational teams through clear runbooks and shared knowledge.
Design & build Logstash pipelines for ingesting data into Elasticsearch
• Develop & manage Apache NiFi flows for routing, transformation and enrichment
• Develop & optimise Python scripts for enrichment, automation and alerting
• Collaborate & support security and IT teams to onboard new log sources
• Document & maintain pipeline designs, data standards and operational runbooks
You will be an experienced data engineer with a strong background in log ingestion, data processing and analytics within secure or enterprise environments. You should be comfortable taking ownership of complex data flows, communicating clearly with stakeholders, and continuously improving how data platforms operate.
3+ years' experience in data engineering or a related development role
• Proficiency in designing and optimising data flows in large-scale environments
• Strong Python skills for data processing, enrichment and automation
• Willingness to obtain, or hold, MOD high-level security clearance
Experience with Apache NiFi data flow design and management
• Familiarity with Windows event logging and syslog collectors
• Good understanding of Linux system administration and network protocols
Come join our team-one of the largest IT and business consulting services firms in the world.