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Senior SOC Analyst

Location: London
Working Pattern: 4 days onsite, 1 day remote
Hours: Monday-Friday, standard business hours (no shift work)

Overview

We are seeking an experienced Senior SOC Analyst to support a major cyber security transformation programme within a global enterprise environment.

This role is ideal for a senior, hands-on Security Operations professional who combines strong incident investigation and threat analysis skills with experience in detection engineering, operational process development, and stakeholder engagement.

Working as a key bridge between regional and global Security Operations teams, you will play a critical role in the globalisation of security monitoring capabilities, helping to onboard, validate, optimise, and operationalise detection content while ensuring analysts have effective procedures and playbooks in place.

Key Responsibilities

Detection Rule Globalisation

Lead the onboarding of EMEA detection rules into the Global Security Operations Centre.Review and validate detection logic, thresholds, alert conditions and expected behaviours across SIEM platforms such as Microsoft Sentinel, Splunk, QRadar, ArcSight, Exabeam, and LogRhythm.Ensure accurate mapping of detection content to recognised threat frameworks, including MITRE ATT&CK.Identify detection gaps, duplicate content and optimisation opportunities through detection engineering, threat hunting, and alert tuning activities.Support standardisation of monitoring capabilities across global security teams covering EDR, XDR, cloud, identity, email, and network security telemetry.

SOP Development & Operationalisation

Develop and maintain Standard Operating Procedures (SOPs) for Tier 1 and Tier 2 SOC teams.Create investigation workflows, triage processes and escalation procedures for security incidents across Microsoft Defender, CrowdStrike, Cortex XDR, SentinelOne, Carbon Black, Azure, AWS, and GCP environments.Define required enrichment data, threat intelligence inputs and decision-making criteria.Ensure procedures are practical, repeatable and aligned with global security operations.Develop analyst playbooks and support SOAR and automation initiatives using technologies such as Microsoft Sentinel Automation, Cortex XSOAR, Splunk SOAR, Tines, and Swimlane.

Threat Analysis & Detection Validation

Validate the effectiveness of security detections through threat-focused analysis and threat hunting activities.Perform quality assurance reviews of detection rules and analyst handling processes.Review and simulate alert scenarios to confirm investigation workflows and expected outcomes.Analyse attacker tactics, techniques and procedures (TTPs) and ensure detection content remains aligned with emerging threats.Utilise KQL, SPL, SQL, log analysis, event correlation, and telemetry investigation to validate detection's and support investigations.Support continuous improvement of detection and response capabilities.

Stakeholder Management & Collaboration

Work closely with Security Operations, Detection Engineering, Threat Intelligence, Incident Response, and Global SOC teams.Act as a bridge between regional and global security functions.Deliver knowledge transfer sessions and operational walkthroughs.Translate complex technical concepts, detection logic, threat activity, and investigation outcomes into clear, business-friendly language.

Documentation & Governance

Maintain high-quality documentation of detection content and operational procedures.Ensure traceability between detection logic, threat mappings and analyst workflows.Support audit and compliance requirements through robust process documentation.

Essential Skills & Experience

Minimum 4 years' experience as a Tier 2 SOC Analyst (or recent Tier 3 experience).Strong background in security incident investigation, threat analysis, and threat hunting.Experience reviewing, tuning and validating detection rules and security alerts within SIEM platforms such as Microsoft Sentinel, Splunk, QRadar, ArcSight, Exabeam, or LogRhythm.Experience working with Microsoft Defender XDR, Microsoft Defender for Endpoint, CrowdStrike Falcon, Cortex XDR, SentinelOne, Carbon Black, or similar EDR/XDR technologies.Proven experience creating SOPs, playbooks, SOAR workflows, or response procedures for SOC teams.Strong understanding of attacker tactics, techniques and procedures (TTPs).Experience mapping detections to recognised threat frameworks such as MITRE ATT&CK.Experience using KQL, SPL, SQL, or similar query languages for investigation, threat hunting, and alert validation.Ability to define escalation criteria and investigation workflows.Experience working across multiple security teams and stakeholder groups.Strong communication skills with the ability to mentor and guide junior analysts.

Desirable Experience

Security transformation, SOC modernisation, or globalisation projects.Detection engineering experience.SOAR workflow, automation, or response procedure development.Quality assurance of SOC processes and detection content.Experience within financial services or highly regulated environments.Experience delivering analyst training and knowledge transfer sessions.Experience working within Azure, AWS, or GCP cloud environments.Experience with threat intelligence integration, detection use case development, and security monitoring strategy.

Qualifications

Degree in Cyber Security, Information Security, Computer Science, or equivalent practical experience.Relevant security operations, incident response, or monitoring certifications.Industry certifications such as Security+, CySA+, GCIH, GCIA, CISSP, SC-200, SC-300, AZ-500, or equivalent are advantageous.

Ideal Candidate

The ideal candidate is a genuinely senior SOC professional, not simply a Detection Engineer or Tier 1 Analyst. You will have a broad Security Operations background covering incident investigation, threat analysis, detection engineering, playbook development, stakeholder management, and mentoring.

You will be comfortable operating between regional and global teams, driving consistency across security operations and helping shape how detection and response capabilities are delivered at scale.

This is an excellent opportunity for a senior SOC professional looking to influence a large-scale Security Operations transformation while remaining technically hands-on.

GCS is acting as an Employment Agency in relation to this vacancy.

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GCS is acting as an Employment Business in relation to this vacancy.

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ROLE PURPOSE

Business Analysts are responsible for eliciting, analysing, and documenting business requirements for the PMP programme, ensuring solutions address operational needs and deliver measurable improvements.

PRINCIPAL ACCOUNTABILITIES

Engage with operational and enabling stakeholders to gather, analyse and clarify business requirements.Translate business needs into clear, structured artefacts including process maps, user stories and functional specifications.Ensure requirements are documented accurately, clearly and to agreed PMP standards.Support testing and acceptance activities by validating delivered solutions against approved business requirements.Assist with User Acceptance Testing (UAT), clarifying acceptance criteria and supporting issue resolution.Maintain traceability between requirements, delivered solutions and expected benefits.Support assurance and governance activity by ensuring documentation and evidence are audit‑ready.

Collaboration & Delivery Support

Work closely with Operational teams, Project Managers, Product Managers, Developers, Testers and IT Business Partners to ensure requirements are fully understood and correctly implemented.Support prioritisation of requirements in line with PMP objectives, constraints, risks and dependencies.Act as a point of clarification during development and testing cycles, resolving requirement queries.

Key Relationships

Internal: Product Managers, Developers, Testers, Project Managers, IT Business Partners, Operational Managers, Quality ManagerExternal: Clients Project Delivery Team, Third‑party suppliers (as required)

GCS is acting as an Employment Business in relation to this vacancy.

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GCS is acting as an Employment Business in relation to this vacancy.

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GCS is acting as an Employment Business in relation to this vacancy.

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Job Summary:

We are seeking a highly skilled and experienced Fiber Analyst to join our team and help technicians and engineers remotely.The successful candidate will be responsible to help technicians remotely for perform Fiber characterization, Bi-directional Testing, troubleshooting remotely on vendor Fiber networks, primarily within ISP & OSP environments.The role requires expertise in OTDR to validate Fiber paths remotely, identify issues, and provide remediation recommendations.As part of a small, dynamic remote team, you will have to prepare test packages remotely, manage project schedules, and collaborate with vendors, project managers, and internal teams to deliver high-quality results.

Key Responsibilities:

Help technicians and engineers in the field for Fiber Testing & Troubleshooting:

Read OTDR to map and analyse Fiber routes, identifying splices, connectors, bends, and faults along the Fiber path.

Help them Perform CD/PMD, Bi-directional testing and power meter/laser tests to assess Fiber integrity and bandwidth capabilities remotely.

Remediation & Repair: Based on test results, perform fusion splicing on problematic Fiber segments, ensuring minimal signal loss and optimal Fiber performance.

Help technicians and field engineers Conduct Fiber end-face inspection and cleaning as necessary.

Documentation & Reporting: Prepare comprehensive test reports remotely, redlined Fiber path documentation, and demarcation maps.

Document and report all findings, remediation efforts, and retest results to stakeholders, including vendors and project managers.

Vendor & Project Management Interface: Work closely with vendors remotely, project managers, and internal Fiber analysts to execute Statements of Work (SOWs) and provide timely feedback on Fiber network issues. Assist with scheduling, coordinating resources, and managing project timelines.

GCS is acting as an Employment Business in relation to this vacancy.

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Job Summary:

We are seeking a highly skilled and experienced Fiber Analyst to join our team and help technicians and engineers remotely.The successful candidate will be responsible to help technicians remotely for perform Fiber characterization, Bi-directional Testing, troubleshooting remotely on vendor Fiber networks, primarily within ISP & OSP environments.The role requires expertise in OTDR to validate Fiber paths remotely, identify issues, and provide remediation recommendations.As part of a small, dynamic remote team, you will have to prepare test packages remotely, manage project schedules, and collaborate with vendors, project managers, and internal teams to deliver high-quality results.

Key Responsibilities:

Help technicians and engineers in the field for Fiber Testing & Troubleshooting:

Read OTDR to map and analyse Fiber routes, identifying splices, connectors, bends, and faults along the Fiber path.

Help them Perform CD/PMD, Bi-directional testing and power meter/laser tests to assess Fiber integrity and bandwidth capabilities remotely.

Remediation & Repair: Based on test results, perform fusion splicing on problematic Fiber segments, ensuring minimal signal loss and optimal Fiber performance.

Help technicians and field engineers Conduct Fiber end-face inspection and cleaning as necessary.

Documentation & Reporting: Prepare comprehensive test reports remotely, redlined Fiber path documentation, and demarcation maps.

Document and report all findings, remediation efforts, and retest results to stakeholders, including vendors and project managers.

Vendor & Project Management Interface: Work closely with vendors remotely, project managers, and internal Fiber analysts to execute Statements of Work (SOWs) and provide timely feedback on Fiber network issues. Assist with scheduling, coordinating resources, and managing project timelines.

GCS is acting as an Employment Business in relation to this vacancy.

Read less

Job Summary:

We are seeking a highly skilled and experienced Fiber Analyst to join our team and help technicians and engineers remotely.The successful candidate will be responsible to help technicians remotely for perform Fiber characterization, Bi-directional Testing, troubleshooting remotely on vendor Fiber networks, primarily within ISP & OSP environments.The role requires expertise in OTDR to validate Fiber paths remotely, identify issues, and provide remediation recommendations.As part of a small, dynamic remote team, you will have to prepare test packages remotely, manage project schedules, and collaborate with vendors, project managers, and internal teams to deliver high-quality results.

Key Responsibilities:

Help technicians and engineers in the field for Fiber Testing & Troubleshooting:

Read OTDR to map and analyse Fiber routes, identifying splices, connectors, bends, and faults along the Fiber path.

Help them Perform CD/PMD, Bi-directional testing and power meter/laser tests to assess Fiber integrity and bandwidth capabilities remotely.

Remediation & Repair: Based on test results, perform fusion splicing on problematic Fiber segments, ensuring minimal signal loss and optimal Fiber performance.

Help technicians and field engineers Conduct Fiber end-face inspection and cleaning as necessary.

Documentation & Reporting: Prepare comprehensive test reports remotely, redlined Fiber path documentation, and demarcation maps.

Document and report all findings, remediation efforts, and retest results to stakeholders, including vendors and project managers.

Vendor & Project Management Interface: Work closely with vendors remotely, project managers, and internal Fiber analysts to execute Statements of Work (SOWs) and provide timely feedback on Fiber network issues. Assist with scheduling, coordinating resources, and managing project timelines.

GCS is acting as an Employment Business in relation to this vacancy.

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Fiber Analyst
Location: Remote
Contract: 12+ Months

About the Role

We are seeking an experienced Fiber Engineer to join a dynamic field team supporting fiber network testing, troubleshooting, and remediation activities across ISP and OSP environments. This role requires hands-on expertise in OTDR analysis, fiber characterization, bidirectional testing, and fusion splicing to ensure the performance, reliability, and integrity of fiber optic networks.

The ideal candidate will have a strong telecommunications background and be comfortable working directly with vendors, project managers, and technical teams while traveling to customer sites as needed.

Key ResponsibilitiesPerform OTDR testing to validate fiber paths and identify faults, bends, splice losses, and connectivity issuesConduct fiber characterization, CD/PMD testing, bidirectional testing, and power meter/laser testingTroubleshoot fiber network issues and provide remediation recommendationsPerform fusion splicing, fiber repairs, and restoration activities as requiredConduct fiber end-face inspection and cleaning to maintain optimal network performancePrepare detailed test reports, redlined fiber documentation, and demarcation mapsDocument findings, remediation efforts, and retest results for project stakeholdersCollaborate with vendors, project managers, and internal teams to support project delivery and timelinesTravel to customer sites to perform testing, troubleshooting, and remediation activitiesRequired Qualifications5+ years of experience in Fiber Optics, Telecommunications, or a related fieldExperience working with both ISP (Inside Plant) and OSP (Outside Plant) fiber networksStrong expertise in OTDR testing, analysis, and troubleshootingExperience with CD/PMD testing, bidirectional testing, and power/loss measurementsHands-on experience with fusion splicing and fiber remediationKnowledge of fiber end-face inspection and cleaning proceduresProficiency in Microsoft Word and ExcelStrong analytical, troubleshooting, and problem-solving skillsExcellent communication and documentation abilitiesAbility to work independently and manage multiple prioritiesWillingness to travel as requiredPreferred SkillsExperience supporting fiber deployment, maintenance, and network validation projectsAbility to interpret complex test results and communicate findings to technical and non-technical stakeholdersExperience working closely with vendors and project management teamsDeliverablesOTDR, CD/PMD, and power/loss testing reportsRedlined fiber path documentation and demarcation mapsDocumented remediation activities and retest resultsTest findings and performance recommendations provided to vendors and stakeholdersWork EnvironmentWork as part of a small, collaborative field teamPartner closely with Project Managers, Fiber Analysts, and vendor contactsFlexible travel schedule based on project and customer requirementsMust-Have Experience

Fiber Testing
OTDR Analysis & Troubleshooting
ISP/OSP Fiber Networks
Fiber Characterization (CD/PMD)
Fusion Splicing & Remediation
Telecommunications Environments

If you're a hands-on Fiber Engineer with strong testing and troubleshooting experience looking to support critical network infrastructure projects, we'd love to connect with you.

GCS is acting as an Employment Business in relation to this vacancy.

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We're looking for a Junior Business Analyst for a 6-month hybrid contract (2-3 days onsite), ideal for someone early in their career - recently out of university with 2-3 years of experience in business analysis and admin support tasks.

Bonus if you have CRM experience (Salesforce, HubSpot, etc.) and familiarity with tools like Jira or Confluence.

If you're looking to grow your BA skills in a supportive, fast-paced environment, I'd love to tell you more.

GCS is acting as an Employment Business in relation to this vacancy.

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