253 jobs for “System And Network Administrator”
Cloudflare
Join the Security Rules team to design, build and operate microservices behind Cloudflare's Application Security products such as Rate Limiting and Web Application Firewall. Work mainly in Rust and Go across distributed systems, databases, Docker and Kubernetes, with on-call duties and mentoring responsibilities.
Rust · Go · Docker +7
Cloudflare
Lead research, design and evaluation of detection models identifying automated, fraudulent and malicious activity across Internet-scale traffic. Own the detection measurement framework for noisy or delayed ground truth, mentor others, and drive cross-functional detection strategy with ML, data and product teams.
Python · SQL
Back TO Work
Support the monitoring and protection of business systems for a growing financial services organisation, identifying security threats and helping keep critical financial data secure. Day to day involves monitoring alerts, reviewing logs, escalating potential threats, investigating incidents and maintaining documentation, with hands-on exposure to security monitoring tools and incident management processes.
CrowdStrike · 1001–5000 people · Public
Owns major components of the Windows kernel-mode Falcon sensor, architecting and building anti-virus and EDR features that span file system, memory, process and networking subsystems. Leads projects end to end, from design through unit and component testing, while mentoring and collaborating with a distributed, cross-platform team.
Windows · Mac · Linux +1
CrowdStrike · 1001–5000 people · Public
Owns major components of the Falcon endpoint sensor, a Windows kernel-mode driver that observes system activity, detects malicious behaviour and provides on-box prevention plus telemetry to the cloud. Work spans architecture, design and delivery across file system, memory, process and networking subsystems, with shared components across Windows, Mac and Linux. Involves leading projects, mentoring and collaborating with distributed teams.
Windows · Mac · Linux +2
Darktrace · 2001–5000 people · Late stage
Acts as the go-to authority in a chosen reliability specialism—observability, performance engineering, data infrastructure, security-focused SRE or network reliability—defining standards and best practices across SRE, Platform Engineering and DevSecOps. Builds tooling and automation, leads deep-dive investigations into systemic issues, and contributes to incident response and on-call rotations in a cloud-native, Kubernetes-based environment.
AWS · GCP · Azure +1
Airbus · 10000+ people · Public
Acts as a trusted advisor to clients across sectors, delivering governance, risk and compliance guidance spanning secure architecture, IDAM, PAM and DLP, and frameworks such as ISO 27001, NIST CSF and NIS2. Produces risk assessments, gap analyses and remediation roadmaps, while supporting bids, content creation and marketing events. Requires UK Government Security Clearance and works hybrid from the Bristol office 2-3 days a week.
IDAM · PAM · DLP +5
Appcast Enterprise
Protects a critical defence IT application and infrastructure by running vulnerability scans, managing endpoint security, responding to incidents and hardening systems. Works with frameworks such as Government Functional Standard 007 and standards like CIS, STIG and NIST, leading security implementation and assurance on a major UK government programme.
CIS · STIG · NIST +2
PRIORY
Lead the UK information security strategy for a large healthcare provider, owning IT risk, governance and compliance across the business. The role involves running risk registers, maintaining an ISO 27001-aligned ISMS, leading internal and external audits, overseeing supplier risk assessments and directing incident response, reporting to the UK CIO and working with the Group CISO.
ISO 27001 · NIST · Cyber Essentials +1
Risk Ledger
Full-stack product engineering role in a cross-functional squad, owning mid-to-large initiatives end to end and shaping product strategy with designers and PMs. Stack centres on Go, AWS and Vue.js, with a strong emphasis on system design, testing, automation and mentoring other engineers.
Go · AWS · Vue.js +7
Palo Alto Networks
Deliver expert-level technical support to top-tier cybersecurity customers, owning complex cases from initiation to resolution through multi-vendor troubleshooting, fault isolation and root cause analysis. Act as a designated customer advocate running weekly reviews, QBRs and upgrade planning, while working with Engineering and QA on bug reports and test plans.
Palo Alto Networks · Prisma Access · Cisco Firepower +7
Back TO Work
Support a manufacturing organisation's security team by monitoring SIEM alerts, investigating potential threats and assisting with vulnerability management across business and production systems. The role also covers access reviews, compliance with information security standards, awareness activities and risk assessments, working closely with IT, engineering and production colleagues.
SIEM
Vantage
Hands-on technical ownership of OT cybersecurity delivery across automation and systems integration projects, covering PLC, HMI, SCADA, servers and industrial networks. Involves designing secure OT networks with managed switches and firewalls, producing risk assessments and documentation, and applying IEC 62443 and NIS standards through testing and client handover.
Rockwell · Siemens · AVEVA +4
Appcast Enterprise
Monitors and administers anti-malware, EDR, application control and DLP tooling plus OS patch deployment across bp's global operational technology and process control networks. The role sits in the OT Security Operations service, managing secure file transfer, vulnerability and asset inventory tooling, and supporting incident response while working closely with site teams. Requires a minimum of three days per week on-site at Sunbury.
Trellix · Microsoft WSUS · Layer 2 Networking +1
HSB Technical
Secures internal and customer networks by managing firewalls, SIEM, IDS/IPS and vulnerability tools, investigating incidents and ensuring ISO27001 and GDPR compliance. Works with IT, Engineering and Compliance teams to protect satellite, maritime and government systems, providing third-line support and documentation.
Cisco Firewalls · Cisco Routers · Cisco Switches +6
