OCS UK & Ireland is a leading facilities management company with 50,000+ colleagues and a turnover in excess of £2bn. We deliver innovative, award-winning services within facilities management, hard services, cleaning, security and catering.
Our mission is to make people and places the best they can be for our colleagues, customers and the communities we serve. Our commitment to doing business the right way is rooted in our TRUE values - Trust, Respect, Unity, and Empowerment.
Why Work for OCS?
✅Award-Winning Employer: Ranked 36th on Glassdoor’s Best Companies to Work For 2025 — we value and motivate our people.
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Professional Growth: 600+ live learners across UK&I — Empowering colleagues with further development and qualifications!
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The Security Operations Analyst plays a central role in strengthening OCS’s cyber defence capability.
The role exists to make our SecOps function measurably more effective every quarter, by improving how we detect, investigate and respond to threats, and by removing the friction that holds analysts back.
We are looking for a proactive engineer who does not wait to be told where the problems are. The successful candidate will actively look for weaknesses in our detection coverage, configuration drift in our security platforms, gaps in our automation and inefficiencies in our processes. They will then propose pragmatic fixes, build them, and measure the outcome
Main Duties & Responsibilities of the Role
Detection engineering and tuning
Build, test and maintain high-quality detections across our SIEM, XDR and email security platforms, mapped to the MITRE ATT&CK framework
Continuously tune existing detections to reduce false positives and improve fidelity, using a data-driven approach
Identify gaps in detection coverage proactively and propose engineering work to close them
Develop and maintain detection-as-code practices, including version control, peer review and CI/CD where appropriate
Automation and tooling
Identify repetitive analyst tasks and engineer automation to remove them, using SOAR, native platform automation, scripting or low-code approaches
Build and maintain integrations between security tools and adjacent platforms such as identity, endpoint management and ticketing
Develop and maintain dashboards that give analysts and leadership a clear view of operational health
Platform health and configuration
Own the configuration and ongoing health of assigned SecOps platforms, including SIEM, EDR, email security and identity protection
Monitor for configuration drift, agent coverage gaps and ingestion failures, and resolve them at source
Lead technical onboarding of new log sources, telemetry and integrations, ensuring that data is usable, normalised and well documented
Threat hunting and proactive defence
Conduct regular threat hunts based on intelligence, recent incidents and known weaknesses, documenting hypotheses, methodology and findings
Translate hunt findings into durable detections, automation or process changes
Contribute to purple team exercises and adversary emulation, working with internal and external partners
Incident response support
Provide deep technical support during significant incidents, including forensic data collection, log analysis and containment engineering
Capture lessons learned from incidents and translate them into engineering improvements that prevent recurrence
Continuous improvement
Maintain a backlog of identified weaknesses, ideas and improvements, and work with the Senior SecOps Lead to prioritise it
Document standards, runbooks and engineering decisions clearly, so that knowledge does not live only in individual heads
Stay current with the threat landscape, vendor road maps and the broader security engineering community, and bring relevant ideas back into OCS
Professional Qualifications required for the job (particularly for compliance purposes or technical requirements of the role)
Extensive SecOps experience with a multitude of different tools
Relevant Industry Certifications
Experience –previous experience –desirable/essential for technical competence of the role
Demonstrable hands-on experience as a security engineer or senior SOC analyst with engineering responsibilities
Strong working knowledge of at least one enterprise SIEM and one EDR or XDR platform, with the ability to write detections, tune content and operate at a deep technical level
Solid scripting ability, for example in Python, PowerShell or KQL, with a working understanding of APIs and integration patterns
Practical understanding of common attack techniques mapped to MITRE ATT&CK, and how they manifest in telemetry
A proactive mindset: the candidate must be able to point to specific examples where they have identified a problem, designed a solution and delivered it end to end
Strong written communication, including the ability to document detections, runbooks and engineering decisions to a high standard
Personal Characteristics/Attributes
Organisational and time management skills
Strong interpersonal skills
Exceptional written and verbal communication skills
Ability to work under own initiative, as well as part of a team
Willingness and ability to undertake national travel as required
Confidence to stand their ground and drive a Security First environment
The ability to learn new tools quickly and effectively
If you are interested in joining a business that encourages professional development, career progression and the chance to work with inspirational people then please click apply and register your interest! You can also sign up to our job alerts when registering which will notify you when other suitable vacancies are available.
We are an equal opportunities employer and rely on a diverse workforce with a broad range of knowledge, skills, and backgrounds to deliver our goals. We offer an inclusive and welcoming environment and actively encourage applications from all individuals regardless of race, gender, nationality, religion, sexual orientation, disability, or age.
