Senior Cyber Use Case Developer

sunlife; Waterford; On-site; EUR 90,000 - 120,000; Full time

Job summary

Sun Life is seeking a Senior Cyber Use Case Developer to lead the design, development, testing and continuous improvement of advanced security monitoring use cases across SIEM, EDR, XDR, cloud, and identity telemetry sources.

You will translate adversary tactics and business risk into scalable, high-fidelity detection logic, collaborating with Security Operations, Threat Hunting, and Incident Response teams to mature detection capabilities and reduce false positives.

Qualifications

• 5+ years of experience in security operations, detection engineering, threat hunting, incident response, cyber threat intelligence, security engineering, or related function.
• Relevant certifications such as CISSP, GIAC, CompTIA CySA+ or MITRE ATT&CK Defender.
• Demonstrated experience leading or contributing to detection use case development and SIEM content engineering.

Responsibilities

• Lead development, enhancement, and lifecycle management of cyber security detection use cases across SIEM/EDR/XDR and cloud telemetry.
• Translate threat intelligence and business risk into high fidelity detection logic aligned to MITRE ATT&CK.
• Design, test, tune, and peer review advanced correlation rules, queries, analytics, and alert logic.

Skills

Security operations

Detection engineering

Threat hunting

Incident response

Cyber threat intelligence

Security engineering

Education

Post-secondary education in Cyber Security / related field

Tools

SIEM

EDR

XDR

MITRE ATT&CK framework

Job description

You are as unique as your background, experience and point of view. Here, you'll be encouraged, empowered and challenged to be your best self. You'll work with dynamic colleagues - experts in their fields - who are eager to share their knowledge with you. Your leaders will inspire and help you reach your potential and soar to new heights. Every day, you'll have new and exciting opportunities to make life brighter for our Clients - who are at the heart of everything we do.

At Sun Life, we're driven by our Purpose: helping our Clients achieve lifetime financial security and live healthier lives. Our values shape how we work: caring, authentic, bold, inspiring, and impactful.

When you join Sun Life, you'll work with passionate colleagues and empowering leaders who support your growth and celebrate your contributions, so you can make a meaningful difference in our Clients' lives.

Discover how you can make a difference in the lives of individuals, families and communities around the world.

Job Description:

The Senior Cyber Use Case Developer is responsible for leading the design, development, testing, and continuously improvement of advanced security monitoring use cases that detect suspicious activity, policy violations, and potential cyber threats across complex enterprise environments. This role provides subject matter expertise in detection engineering, threat-informed defence, telemetry analysis, and alert optimization, translating adversary behaviours, business risks, and operational requirements into actionable, high-fidelity detection logic.

The senior developer acts as a technical lead and trusted advisor for various teams, including Security Operations, Cyber Threat Hunting, Cyber Threat Intelligence, Incident Response. The role helps mature the organization's detection capability by improving coverage of priority threats, reducing false positives, standardizing use case lifecycle practices, and ensuring detections remain effective as threats, technologies, and business priorities evolve.

Key Responsibilities

• Lead the development, enhancement, and lifecycle management of cyber security detection use cases across SIEM, EDR, XDR, cloud, identity, network, endpoint, and application telemetry sources.
• Translate adversary tactics, techniques, procedures, threat intelligence, incident learnings, and business risk scenarios into scalable, high-fidelity detection logic aligned to frameworks such as MITRE ATT&CK.
• Design, write, test, tune, and peer review advanced correlation rules, search queries, analytics, dashboards, and alert logic using platforms.
• Establish and maintain use case development standards, including intake, prioritization, design documentation, validation, deployment readiness, tuning, change control, performance measurement, and retirement criteria.
• Assess enterprise telemetry coverage, data quality, parsing, normalization, and logging gaps, and partner with engineering teams to improve data source reliability and detection readiness.
• Lead detection gap assessments and coverage mapping for priority threat scenarios, critical assets, attack paths, control failures, and emerging threat behaviours.
• Partner with Threat Hunting and Threat Intelligence teams to operationalize intelligence, hypotheses, and hunting outcomes into durable monitoring content and proactive detection capabilities.
• Drive false-positive reduction and alert quality improvements through structured tuning, enrichment, suppression logic, threshold refinement, and feedback from operational teams.
• Support purple team, attack simulation, breach and attack emulation, tabletop, and control validation exercises to test and improve detection coverage.
• Measure and report use case performance through metrics such as alert volume, precision, true‑positive rate, false‑positive rate, coverage, mean time to detect, and operational usefulness.
• Be a mentor for the team and contribute to knowledge sharing, peer reviews, technical training, and continuous improvement of detection development practices.
• Stay current on emerging threats, vulnerabilities, adversary tradecraft, cloud and identity attack techniques, and security monitoring best practices, and apply those insights to detection strategy.

Qualifications

• Post‑secondary education in Cyber Security, Information Technology, Computer Science, Information Systems, Engineering, or a related field, or equivalent practical experience.
• 5 or more years of experience in security operations, detection engineering, threat hunting, incident response, cyber threat intelligence, security engineering, or a related cyber security function.
• Relevant certifications such as CompTIA CySA+, GIAC GCIH, GCIA, GCTI, GCDA, GCFA, CISSP, Microsoft Security certifications, Splunk certifications, cloud security certifications, or MITRE ATT&CK Defender.
• Demonstrated experience leading or materially contributing to detection use case development, SIEM content engineering, alert tuning, and use case lifecycle man