Cyber Security Jobs

• London
• On-site
• Senior

Provide advanced technical support for Cortex XSIAM customers, triaging tickets, calls and escalations within SLAs and performing application- and OS-level troubleshooting. Work with developers to reproduce issues and implement permanent fixes, and with technical account managers to mitigate risk in customer environments. Requires SIEM, EDR and endpoint security expertise plus UK security clearance.

Cortex XSIAM · Kubernetes · GCP +10

• United Kingdom
• Remote
• Senior

Provide advanced technical support for Cortex XSIAM customers, triaging issues via ticketing, phone and remote sessions, and performing application- and OS-level troubleshooting. Work with developers to reproduce faults and implement permanent fixes, and with technical account managers to mitigate risks in customer environments.

Cortex XSIAM · Kubernetes · GCP +10

• London
• On-site
• Senior
• Permanent

Builds AI/ML-driven security automation systems that detect, analyse and respond to threats at Amazon scale, integrating automated detection into the company's security infrastructure. Works alongside security engineers and scientists on proactive, offensive and defensive tooling, researching and prototyping new approaches. Distinct for its focus on autonomous security across one of the world's largest tech ecosystems.

AWS

• London
• On-site
• Mid-level
• Permanent

Application security engineer role focused on security reviews, secure architecture design, threat modeling, and security guidance for internal development teams. Distinct for automating and enhancing security review processes using AI agents, LLMs, and generative AI tooling, alongside security metrics and training outreach.

AI Agents · LLMs · Generative AI

• Newbury
• Senior

Monitors and manages network equipment and infrastructure for customer services across EMEA and North America, with a strong focus on firewall and network security administration. Day-to-day work covers Cisco ASA, Firepower and Palo Alto firewalls, VMware vSphere and NetApp storage, plus automation and out-of-hours support on a rota.

Cisco ASA · Cisco Firepower Threat Defense · Palo Alto PA-Series +7

• London
• Lead

Technical owner for a portfolio of EMEA strategic accounts and US identity/workforce platform partners, split roughly 70/30. Drives API and SDK integration, product adoption, RFPs, trials and proofs of concept while mentoring solutions engineers globally and feeding market insight into the product roadmap.

RESTful APIs · SDKs

• Birmingham
• Hybrid
• Mid-level
• Permanent

Champion SRE best practices across engineering, platform and service operations teams, implementing SLOs, SLIs and error budgets for critical services. Build observability through monitoring, logging, tracing and alerting, automate operational tasks, and support incident response and resilience testing. Also involves AIOps adoption and embedding reliability into delivery pipelines.

AIOps

• London
• Senior · manages people

Lead the Threat Application Services team within Cloudforce One, owning the Threat Events platform, external Threat Intel APIs, and backend systems that feed IOCs into WAF and Gateway for automated mitigation. Set architectural direction and operational excellence for distributed, high-latency-sensitive services, while hiring and mentoring engineers building agentic threat intelligence tools.

Cloudflare Workers · SQLite · D1 +4

• London
• €66,000 – €91,000 pa
• Senior

Builds and operates microservices behind Cloudflare's Application Security products such as Rate Limiting and Web Application Firewall, working mainly in Rust and Go with Docker, Kubernetes, PostgreSQL, Kafka and Clickhouse. Senior engineers lead complex projects from design through production, mentor peers, and improve reliability of distributed systems at global scale, with on-call flexibility required.

Rust · Go · C++ +7

• Knutsford
• Senior · manages people

Hands-on engineering role safeguarding encryption keys and cryptographic services across 300+ enterprise platforms, working extensively with Thales and Entrust HSMs. Involves key management, certificate management, production support, and on-call rotation, with occasional off-site data centre work.

Thales · Entrust · SharePoint +5

• London
• Hybrid · 3 days in office
• £50,000 – £60,000 pa
• Mid-level

Own a cloud-first Microsoft Azure environment for a growing London SaaS business, covering security, reliability and cost-effectiveness. Manage Microsoft 365, identity and internal IT while supporting product engineers and working with compliance colleagues and an external MSP. AI tools, scripting and automation are actively encouraged.

Microsoft Azure · Microsoft 365 · Entra ID +4

• London
• Hybrid · 3 days in office
• £50,000 – £60,000 pa
• Mid-level

Own a cloud-first Microsoft Azure environment for a growing London SaaS business, covering infrastructure security, cost and reliability. Manage Microsoft 365, identity and internal IT while supporting product engineers and working with compliance colleagues and an external MSP. Uses AI tools, scripting and automation to improve efficiency.

Microsoft Azure · Microsoft 365 · Entra ID +4

• Hatfield
• £50,000 – £60,000 pa
• Mid-level

Hands-on IT Manager role owning the IT function across multiple UK sites for a growing engineering business. Day to day you maintain the Microsoft environment, support ERP systems and SQL Server databases, automate manual processes, manage external suppliers and the IT budget, and ensure security, backup and disaster recovery. Considerable autonomy to shape IT strategy and develop in-house solutions.

Microsoft SQL Server · Microsoft 365 · Azure +2

• United Kingdom
• Senior

Lead the development and delivery of an organisation's information security strategy, governance, risk and compliance programme, including ISO 27001 and Cyber Essentials. Provide technical oversight across infrastructure, cloud, networking and security platforms, manage incident response and third-party security providers, and influence senior stakeholders. Suits a security leader with a background in IT infrastructure or networking.

Windows Server · Active Directory · Microsoft 365 +7

• Knutsford
• On-site
• Entry level
• Internship

Ten-week summer internship in Barclays' Chief Security Office, working alongside experts to reduce risk, protect customers and improve security delivery. Interns collaborate with cross-functional teams on real projects, gaining exposure to threat intelligence, controls and secure engineering while building technical skills.