SIEM Content Development Specialist

The SIEM Content Development Specialist plays a critical role in advancing the Cyber Security Operations Center's ability to detect and respond to cybersecurity incidents. This role focuses on designing and developing cutting-edge detection content leveraging a wide array of security technologies and telemetry to identify malicious activity and guide security analysts through effective response playbooks. Working within a threat-led framework, the specialist collaborates across teams to translate threat intelligence into actionable detection logic and response workflows. The position demands strong technical acumen, analytical thinking, and problem-solving capabilities, along with the ability to communicate clearly with peers, leadership, and cross-functional stakeholders. Key accountabilities and decision ownership: Contribute to continuous improvement initiatives across multiple technologies by developing and refining content that enhanced threat detection and response capabilities. Contribute to the development and optimisation of threat detection content, including the tuning of threat and vulnerability management technologies and the continual refinement of SIEM rules and logic to enhance detection accuracy and operational performance. Lead and contribute to the optimisation and modernisation of SIEM content, supporting the adoption of next-generation SIEM technologies and cloud-native security tools. Manage the lifecycle of detection content, including development, testing, release, and retirement, using version control and documentation best practices. Collaborate with DevOps/SecOps teams to integrate security content into broader CI/CD workflows Collaborate with the CSOC Manager to support improvements in security operations through effective content contributions. Support security event analysis by participating in and may drive security event analysis activities to address current cyber threats. Assist in threat response activities, providing analytical input from a blue team perspective to help identify potential threat group behaviours. Contribute to the creation of cyber security reports and advisories, ensuring timely and accurate dissemination to key stakeholders. Participate in residual risk assessments, supporting post-incident analysis and the documentation of operational and technical lessons learned. Collaborating with data owners and customers on understanding data sources and use cases and successfully translating requirements to actionable content. Minimum of 2-5 years' experience in SIEM content (rule logic and code) development role Minimum of 2 years of SOC analyst experience (Level2 or above) required. In depth and extensive hands-on experience in security event analysis, create and refine SIEM/EDR rules and deliver efficiency within the SIEM and all other technologies used within the team. Deep knowledge of IPv4/IPv6, TCP networking protocols Deep knowledge of Windows/Linux operating systems Exceptional working knowledge of security technologies such as SIEM (ArcSight, Sentinel, QRadar, LogRhythm, Splunk), EDR (Microsoft Defender, FireEye, Tanium), IDS/IPS, firewalls, proxies, web application firewalls, anti-virus, etc. Comprehensive understanding of Window Security Event logs and Syslog Excellent familiarity with endpoint/perimeter security attack vectors and detection (blue/purple teaming) Excellent familiarity with standard security frameworks such as MITRE, cyber kill chain and APT campaign strategies Outstanding knowledge of cloud platforms such as Azure, O365, Google cloud, AWS, Oracle Experience with modern SIEM platforms, including cloud-native or hybrid solutions Hands-on experience with CI/CD pipelines and automation tools for security content deployment. Proficiency in version control systems (e.g., Git) for managing SIEM content. Excellent working knowledge of regular expression development Scripting and programming experience is highly desirable Kusto or SQL knowledge, including rule/query optimisation Proven ability to prioritise workload, meet deadlines and utilise time effectively Good interpersonal and communication skills, works effectively as a team leader and the ability. Experience in security event analytics, for example Elastic, Azure Sentinel or Splunk. Demonstrable experience in critical thinking and data or logical analysis. Knowledge of: typical security devices such as firewalls, Intrusion detection system, anti-virus, anti-spam, Cyber threat concepts e.g. cyber kill chain, attack methods, threat actors. Cloud systems and Windows and Linux OS. Experience with investigating intrusions in Linux and cloud environments 3 years or above related experience Excellent verbal and written communication skills Highly disciplined and motivated, able to work independently or under direction Deep understanding of threat actor techniques and tools