Cyber Defence Senior Analyst

A&O Shearman; Belfast City District; On-site; GBP 70,000 - 110,000; Full time

Job summary

A&O Shearman, based in Belfast, seeks a Senior Cyber Defence Analyst to join its Information Security team. The role focuses on in-depth analysis, incident response, and guiding junior colleagues within a global firm.

Weekend working is a requirement with premium pay for weekend hours; you will be part of a 24-7 follow-the-sun model, supporting threat detection, response, and continuous improvement of cyber defence processes.

Qualifications

• Experience in a security operations role across multiple domains (4+ of listed).
• Strong networking knowledge including TCP/IP and DNS.
• Familiarity with security tooling such as SIEM, IDS/IPS, and threat management platforms.
• Excellent communication translating security concepts to business language.

Responsibilities

• Investigate Level 2 escalated events and alerts to identify potential incidents.
• Assist and advise junior colleagues during investigations.
• Conduct initial triage and investigation of confirmed incidents.
• Perform containment, mitigation, and remediation activities with forensic evidence documentation.
• Participate in security incident response exercises and post-exercise reviews.
• Be part of the on-call rota and may require out-of-hours work.
• Coordinate incident hand-offs across time-zones in our 24-7 model.
• Maintain and improve playbooks and process documentation for Cyber Defence.

Skills

Security operations

Incident response

Threat intelligence

DFIR

Communication skills

Education

Bachelor's degree in InfoSec

Tools

SIEM

IDS/IPS

Threat management platforms

Endpoint protection

Firewalls

Job description

We have an exciting opportunity for a Senior Cyber Defence Analyst to join the Information Security team at A&O Shearman in Belfast.

Please note that weekend working is a requirement for this role, with exact shift patterns to be discussed at interview. All weekend hours are eligible for a premium payment, in addition to your base salary.

What You Will Do

The Cyber Defence Senior Analyst will reside within the firm’s information security team and will be based in Belfast. They will perform a critical role in solidifying the firm's security posture, focusing on the in-depth analysis, and effective response to cyber security events and incidents within their time-zone. They will also contribute to the effectiveness and cohesion of the Cyber Defence team by providing guidance to, and sharing knowledge with, more junior Cyber Defence Colleagues.

Investigating Escalations

• Investigate Level 2 escalated events and alerts which have detected been through Level 1 monitoring activities by the firm’s Managed Security Service Provider (MSSP) to identify potential incidents.
• Assist and advise junior colleagues during investigations where additional experience is required.

Incident Response

• Conduct initial triage and investigation of confirmed incidents.
• Perform containment, mitigation, and remediation activities for incidents, ensuring that any required forensic evidence is gathered and documented appropriately along the process.
• Participate in security incident response exercises and contribute to post-exercise reviews.
• Be part of the Cyber Defence on-call rota, which may require out-of-hours work.
• Pick-up and hand-off incident response activities with the rest of the Belfast Cyber Defence team to other teams in different time-zones across the globe, as per our 24-7 follow-the-sun global model.

Documentation And Process Improvement

• Maintain and improve playbooks and process documentation for Cyber Defence.
• Ensure documentation reflects current threat landscapes and operational practices.
• Implement and enhance cyber defence tooling and processes under senior oversight.
• Develop new detection definitions and use cases for monitoring tools.

Mentoring, Collaboration, and Support

• Mentor junior colleagues to support their professional development and operational effectiveness.
• Collaborate with other teams (e.g. Information Security, IT) to implement security controls and raise awareness.
• Support the Threat and Vulnerability Management team in remediation activities by executing system and configuration changes.
• Maintain awareness of current and emerging cyber threats, techniques, and procedures (TTPs) using threat intelligence insights from the Threat and Vulnerability Management team, applying this knowledge in daily operations.
• Provide cyber defence guidance to business stakeholders, translating technical concepts into business language.
• Maintain awareness of current and emerging cyber threats, techniques, and procedures (TTPs).
• Assist the Information Security GRC team with client queries and audits from a cyber defence perspective.

What You Will Have

• Experience in a security operations or similar technical security role, operationally in at least four of the following domains: Security engineering, Alert triaging, Rule writing, Incident response, Digital Forensics and Incident Response (DFIR), Threat intelligence and management, Vulnerability management, or Security control testing.
• Strong understanding of networking and routing protocols (e.g. TCP/IP) and core services (e.g. DNS, SMTP).
• Familiarity with cyber defence technologies and tooling, including SIEM solutions, Intrusion Detection & Prevention Systems (ID/PS), Threat and vulnerability management platforms, Endpoint protection, and Firewalls.
• Highly analytical mindset with the ability to interpret data flows, assess anomalies, and draw meaningful conclusions.
• Demonstrated ability to investigate complex security issues and propose effective solutions.
• Excellent verbal and written communication skills, translating cyber security terminology into professional and straightforward language suitable for a global law firm which includes technical and non-technical teams.
• A genuine passion for continuous learning and development in cybersecurity, staying up to date with the latest developments, trends, and technologies in the field.

You will stand out if you bring

• Bachelor’s degree in Information Security, Computer Science, Engineering, Technology, or a related field.
• Industry-recognised certifications such as, CISSP, CEH, CISM, CompTIA Security+
• Experience working with major cloud service providers (CSPs) technologies, such as:
• Microsoft Azure
• Google Cloud Platform (GCP)
• Amazon Web Services (AWS)
• Prior legal firm or professional services firm experience
• Practical experience with scripting languages such as Python or PowerShell to support automation and tooling enhancements.

NO AGENCIES PLEASE

A&O Shearman does not accept unsolicited CVs. For further information, please see our UK Recruitment Agency Policy and our commitment to direct sourcing here.