Security Architect - Consultant Advisory 12-Month Contract Outside IR35 Hybrid (2 days per week on-site) Location: West London / Greater London We are supporting a major UK transport infrastructure organisation undergoing a significant programme of cyber security improvement and technology transformation. We are seeking an experienced Security Architect Consultant to provide advisory support across a complex digital estate, reviewing security architectures, assessing risks, and supporting the delivery of security improvements across critical technology platforms. This role will involve working with technical teams, architects, and senior stakeholders to review existing security controls, improve security design practices, and support the implementation of secure technology solutions across a highly regulated environment. Key Responsibilities Review and refresh existing Cyber Security Impact Assessments (CSIAs) across a portfolio of live digital products and services. Assess existing threat models and security architectures to ensure they reflect current risks and technology changes. Provide security architecture guidance across projects from initial design through to delivery. Conduct security risk assessments and provide recommendations for security improvements. Support technical teams with secure design reviews and architectural assurance. Review and advise on security improvements across areas including: Network security Firewall technologies Secure remote access / VPN solutions Virtualisation environments Security monitoring and endpoint protection tooling Identity and access controls Infrastructure security Work with engineering and DevOps teams to ensure security is embedded throughout the delivery lifecycle. Produce clear security documentation, architectural recommendations, and risk treatment plans. Support governance activities and security assurance processes. Required Experience Proven experience working as a Security Architect / Cyber Security Consultant within complex enterprise environments. Strong background in security architecture, risk assessments and technical security reviews. Experience reviewing and producing security impact assessments or similar security assurance documentation. Ability to assess technical solutions and provide practical security recommendations. Strong understanding of: Network security architecture Firewalls and secure connectivity VPN technologies Security monitoring solutions Endpoint security controls Cloud and infrastructure security Experience working across large-scale transformation or improvement programmes. Excellent stakeholder management and communication skills. Desirable Experience Experience within aviation, transport, critical national infrastructure (CNI), or other highly regulated sectors. Previous experience supporting environments with operational technology (OT) considerations. Familiarity with safety-critical systems and complex infrastructure environments. Experience working with DevOps / continuous improvement teams. Existing SC Clearance or ability to obtain SC Clearance. Contract Details Contract Length: 12 months IR35 Status: Outside IR35 Working Pattern: Hybrid - 2 days per week on-site Start Date: August / September Rate: Competitive day rate available This is an excellent opportunity for a Security Architect to support a high-profile cyber improvement programme within a complex, mission-critical environment. GCS is acting as an Employment Business in relation to this vacancy.
Jul 31, 2026
Contractor
Security Architect - Consultant Advisory 12-Month Contract Outside IR35 Hybrid (2 days per week on-site) Location: West London / Greater London We are supporting a major UK transport infrastructure organisation undergoing a significant programme of cyber security improvement and technology transformation. We are seeking an experienced Security Architect Consultant to provide advisory support across a complex digital estate, reviewing security architectures, assessing risks, and supporting the delivery of security improvements across critical technology platforms. This role will involve working with technical teams, architects, and senior stakeholders to review existing security controls, improve security design practices, and support the implementation of secure technology solutions across a highly regulated environment. Key Responsibilities Review and refresh existing Cyber Security Impact Assessments (CSIAs) across a portfolio of live digital products and services. Assess existing threat models and security architectures to ensure they reflect current risks and technology changes. Provide security architecture guidance across projects from initial design through to delivery. Conduct security risk assessments and provide recommendations for security improvements. Support technical teams with secure design reviews and architectural assurance. Review and advise on security improvements across areas including: Network security Firewall technologies Secure remote access / VPN solutions Virtualisation environments Security monitoring and endpoint protection tooling Identity and access controls Infrastructure security Work with engineering and DevOps teams to ensure security is embedded throughout the delivery lifecycle. Produce clear security documentation, architectural recommendations, and risk treatment plans. Support governance activities and security assurance processes. Required Experience Proven experience working as a Security Architect / Cyber Security Consultant within complex enterprise environments. Strong background in security architecture, risk assessments and technical security reviews. Experience reviewing and producing security impact assessments or similar security assurance documentation. Ability to assess technical solutions and provide practical security recommendations. Strong understanding of: Network security architecture Firewalls and secure connectivity VPN technologies Security monitoring solutions Endpoint security controls Cloud and infrastructure security Experience working across large-scale transformation or improvement programmes. Excellent stakeholder management and communication skills. Desirable Experience Experience within aviation, transport, critical national infrastructure (CNI), or other highly regulated sectors. Previous experience supporting environments with operational technology (OT) considerations. Familiarity with safety-critical systems and complex infrastructure environments. Experience working with DevOps / continuous improvement teams. Existing SC Clearance or ability to obtain SC Clearance. Contract Details Contract Length: 12 months IR35 Status: Outside IR35 Working Pattern: Hybrid - 2 days per week on-site Start Date: August / September Rate: Competitive day rate available This is an excellent opportunity for a Security Architect to support a high-profile cyber improvement programme within a complex, mission-critical environment. GCS is acting as an Employment Business in relation to this vacancy.
Position: Information Assurance Consultant Location: Remote Daily Rate: £450 - £500 outside IR35 Clearance: UKSV SC Clearance Required We are supporting a specialist cyber security SME as they expand a central government delivery team, and we are seeking an Information Assurance Consultant with strong GovAssure and NCSC CAF experience click apply for full job details
May 13, 2026
Contractor
Position: Information Assurance Consultant Location: Remote Daily Rate: £450 - £500 outside IR35 Clearance: UKSV SC Clearance Required We are supporting a specialist cyber security SME as they expand a central government delivery team, and we are seeking an Information Assurance Consultant with strong GovAssure and NCSC CAF experience click apply for full job details
Cyber Security Consultant - Prisma Access Location: UK (Remote / Hybrid) Contract Length: 12 months IR35 Status: Outside IR35 83zero are partnered with a global organisation delivering a large-scale secure network and cloud security transformation programme . As part of this, we are looking for an experienced Cyber Security Consultant with strong Prisma Access deployment experience to support the design, implementation, and optimisation of modern SASE solutions. This is a senior, hands-on consulting role suited to someone who has delivered enterprise-scale Prisma Access deployments and is comfortable operating in complex environments. The Role You will take ownership of the technical delivery of Prisma Access and Palo Alto SASE solutions , working closely with architects, engineers, and key stakeholders. Key Responsibilities Lead the design and deployment of Prisma Access solutions Deliver SASE and Zero Trust architectures aligned to best practice Integrate Prisma Access with existing Palo Alto technologies (NGFW, Panorama) Support migrations from legacy networks to cloud-delivered security models Provide technical leadership, documentation, and knowledge transfer Troubleshoot complex issues and optimise performance and security posture Work closely with stakeholders to ensure successful project delivery Required Experience & Skills Proven hands-on Prisma Access deployment experience (this is essential) Strong background across Palo Alto Networks technologies Experience delivering within enterprise environments Strong understanding of: SASE architectures Cloud security and network transformation End-to-end delivery within a consulting environment Comfortable engaging with stakeholders and owning delivery Desirable Palo Alto certifications (PCNSE, PCNSA or similar) Experience across large-scale transformation programmes Exposure to broader SASE and cloud security vendors
May 11, 2026
Contractor
Cyber Security Consultant - Prisma Access Location: UK (Remote / Hybrid) Contract Length: 12 months IR35 Status: Outside IR35 83zero are partnered with a global organisation delivering a large-scale secure network and cloud security transformation programme . As part of this, we are looking for an experienced Cyber Security Consultant with strong Prisma Access deployment experience to support the design, implementation, and optimisation of modern SASE solutions. This is a senior, hands-on consulting role suited to someone who has delivered enterprise-scale Prisma Access deployments and is comfortable operating in complex environments. The Role You will take ownership of the technical delivery of Prisma Access and Palo Alto SASE solutions , working closely with architects, engineers, and key stakeholders. Key Responsibilities Lead the design and deployment of Prisma Access solutions Deliver SASE and Zero Trust architectures aligned to best practice Integrate Prisma Access with existing Palo Alto technologies (NGFW, Panorama) Support migrations from legacy networks to cloud-delivered security models Provide technical leadership, documentation, and knowledge transfer Troubleshoot complex issues and optimise performance and security posture Work closely with stakeholders to ensure successful project delivery Required Experience & Skills Proven hands-on Prisma Access deployment experience (this is essential) Strong background across Palo Alto Networks technologies Experience delivering within enterprise environments Strong understanding of: SASE architectures Cloud security and network transformation End-to-end delivery within a consulting environment Comfortable engaging with stakeholders and owning delivery Desirable Palo Alto certifications (PCNSE, PCNSA or similar) Experience across large-scale transformation programmes Exposure to broader SASE and cloud security vendors
