Cyber Detection Use Case Engineer

Sun Life Financial; Ireland; On-site; EUR 75,000 - 115,000; Full time

Job summary

Sun Life Financial is hiring a Cyber Use Case Developer to design, develop, test, and improve security monitoring use cases with emphasis on network security, telemetry, and threat detection across enterprise environments.

You will collaborate with Security Operations, Threat Hunting, and Incident Response teams to translate network behaviors and operational requirements into high-quality alerts, reducing false positives and enabling timely investigations.

Qualifications

• Post-secondary education in Cyber Security, Information Technology, Computer Science, Information Systems, or a related field, or equivalent practical experience.
• Experience in security operations, detection engineering, threat hunting, incident response, cyber threat intelligence, network operations or a related cyber security function.
• Hands-on experience working with network security tools and telemetry, including firewalls, proxies, DNS logs, DHCP logs, VPN platforms, IDS/IPS, NAC, packet capture, or similar technologies.
• Experience writing detection logic or search queries using languages such as SPL, KQL, SQL, Sigma, YARA, Python, PowerShell, or similar.
• Strong understanding of network security concepts, common attacker behaviours, malware techniques, persistence methods, lateral movement, credential abuse, phishing, data exfiltration, cloud or identity-based attacks, and how these behaviours appear in network telemetry.

Responsibilities

• Develop, enhance, and maintain cyber security detection use cases across SIEM, EDR, XDR, cloud, identity, endpoint, and network security data sources.
• Translate adversary tactics, techniques, and procedures into practical detection logic aligned to MITRE ATT&CK.
• Map detection use cases to MITRE ATT&CK framework to ensure comprehensive adversary coverage.
• Write, test, and tune detection rules, search queries, analytics, and alert logic.
• Perform use case lifecycle management, including requirements gathering, design, development, validation, deployment, tuning, documentation, periodic review and retirement.
• Analyze network security telemetry, logs, alerts, packet metadata, flow data, and incident data to identify suspicious patterns.
• Create detections for network-based threats such as C2, lateral movement, beaconing, port scanning, suspicious remote access, anomalous DNS, data exfiltration, and policy violations.
• Collaborate with network security and engineering teams to understand network architecture, segmentation, traffic patterns, security controls, and logging requirements.
• Partner with Threat Hunting team to convert hunt findings into permanent detection use cases.
• Partner with Threat Intelligence team to operationalize intelligence into monitoring content and proactive detection capabilities.
• Collaborate with Defensive Security and Incident Response teams to ensure use cases generate actionable, high-fidelity alerts with clear triage guidance.
• Conduct false-positive analysis and continuously tune detection content to improve precision, reduce noise, and increase operational efficiency.
• Document use case logic, data source dependencies, alert handling instructions, validation results, and performance metrics.
• Support purple team, attack simulation, tabletop, and control validation activities to test and improve detection coverage.
• Track use case performance through metrics such as alert volume, true-positive rate, false-positive rate, coverage, and mean time to detect.
• Stay current on emerging threats, attack techniques, vulnerabilities, and security monitoring best practices.

Skills

SPL

KQL

SQL

Sigma

YARA

Python

PowerShell

Education

Post-secondary education in Cyber Security

Tools

Firewalls

Proxies

DNS Logs

DHCP Logs

VPN Platforms

IDS/IPS

NAC

Packet Capture

Job description

Sun Life Financial is hiring a Cyber Use Case Developer to design, develop, test, and improve security monitoring use cases with emphasis on network security, telemetry, and threat detection across enterprise environments.

You will collaborate with Security Operations, Threat Hunting, and Incident Response teams to translate network behaviors and operational requirements into high-quality alerts, reducing false positives and enabling timely investigations.