Cyber Security Jobs

253 jobs for “System And Network Administrator”

Results

Appvia logo

Appvia · 11–50 people · Series A

AWS Senior Platform Engineer (SC Eligible) – 1–2 Days a Month in Office

  • London
  • Hybrid · 1–2 days in office
  • £75,000 – £90,000 pa
  • Senior
  • Permanent

Design, build and operate secure AWS platforms using Terraform, Kubernetes/EKS and CI/CD for public and private sector clients. You will own technical delivery in your area, create reusable modules and deployment patterns, and mentor less experienced engineers within multi-disciplinary consulting teams.

AWS · Terraform · Kubernetes +7

Featured 3 weeks ago

Fort Recruitment

Senior System and Network Administrator

  • Birkenhead
  • £50,000 – £55,000 pa
  • Senior
  • Permanent

Hands-on senior role owning a marine energy company's IT infrastructure, covering network architecture, security, Linux and AWS administration, DNS, email systems, monitoring, backup and automation. The administrator maintains and improves office, production, lab and remote-access networks, plus disaster recovery and access control, with full training provided.

AWS · Ubuntu · Linux +7

5 days ago

South Wales Police

ICT Cloud Infrastructure and Platforms Specialist

  • Bridgend
  • On-site
  • £47,046 – £55,696 pa
  • Senior · manages people
  • Permanent

Develops and maintains IaaS and PaaS cloud infrastructure within South Wales Police's managed cloud tenants, covering design, deployment, performance tuning, security protocols and disaster recovery. May supervise junior ICT specialists and collaborate with cross-functional teams, working mainly with Microsoft Azure, AWS, Windows Server, Active Directory and Azure Monitor.

Microsoft Azure · AWS · Azure Monitor +5

Clearance required Last month
Appvia logo

Appvia · 11–50 people · Series A

AWS Principal Platform Engineer (SC Eligible)

  • London
  • Hybrid · 1 day in office
  • £90,000 – £120,000 pa
  • Lead · manages people
  • Permanent

Lead platform engineering engagements for a cloud consultancy's enterprise clients, from early solution design through delivery. Set technical direction, mentor platform engineers and consultants, and define reusable standards and patterns across AWS, Kubernetes, Terraform and CI/CD. Combines hands-on engineering, architecture and pre-sales consultancy.

AWS · Azure · GCP +7

Last week

eFinancialCareers

Cyber Response and Recovery Manager

  • London
  • Hybrid
  • £75,000 – £85,000 pa
  • Senior
  • Permanent

Hands-on cyber recovery and remediation role supporting clients through major incidents such as ransomware, destructive malware and Active Directory or cloud compromise. You lead recovery workstreams, rebuild compromised environments, remove attacker persistence and design secure recovery approaches, working alongside incident response, forensics, technology teams and client leadership. Distinct from traditional incident response, it focuses on the recovery phase and long-term resilience.

Azure · AWS · Microsoft 365 +3

SC clearance Today

Cloudflare

Vulnerability Management Engineer

  • London

Identifies, analyses and supports remediation of vulnerabilities across Cloudflare's infrastructure and cloud environments, triaging findings from Qualys, Nessus and Rapid7 against defined SLAs. Works with engineering, infrastructure and compliance teams on DoD IL4 and FedRAMP preparation, using AI-driven tooling to improve scanning, triage and automated remediation.

Qualys · Nessus · Rapid7 InsightVM +2

3 weeks ago

Get new System And Network Administrator roles by email. One email a week when new roles match, or daily if you prefer. Stop any time.

Spectrum IT Recruitment

Cyber Security Analyst

  • Southampton
  • Hybrid · 3 days in office
  • £65,000 pa
  • Mid-level

Operational security role monitoring alerts, investigating incidents and maintaining controls across on-prem, cloud and SaaS environments. You'll handle firewalls, VPNs, endpoint protection, vulnerability management and secure configuration, supporting audits, pen tests and NIST/NIS compliance alongside infrastructure and service delivery teams.

Microsoft Azure · Microsoft 365 · Entra ID +7

2 weeks ago

Cloudflare

Software Engineer (Threat Intelligence), Cloudforce One

  • London
  • Mid-level

Own the full software development lifecycle for distributed systems supporting threat disruption and legal response, building data pipelines that collect and expose threat intelligence for analysts and customers. Work primarily in Golang and TypeScript with Rust, Kafka, Redis, Kubernetes, Terraform and Postgres, collaborating with Threat Intelligence, Trust & Safety, Legal and Product teams, plus on-call rotations and mentoring.

Golang · TypeScript · Rust +7

2 weeks ago
CrowdStrike logo

CrowdStrike · 1001–5000 people · Public

Sr. Analyst, Falcon Complete

  • United Kingdom
  • Remote
  • Senior · manages people

Monitors and performs in-depth analysis of security alerts across Windows, Mac and Linux, handling incidents end to end including malware analysis and remote remediation. Acts as technical escalation point and mentor for junior analysts while improving detection and triage processes in a virtual security operations centre.

CrowdStrike · Windows · Mac +10

2 months ago
CrowdStrike logo

CrowdStrike · 1001–5000 people · Public

Falcon Complete Analyst Intern Graduate - Summer 2027 (Reading, GBR)

  • Reading
  • On-site
  • Entry level
  • Internship

Six-month graduate internship in the Falcon Complete team, working from the Reading office on security alert triage, incident investigation and response, and basic malware analysis. Interns learn the Falcon platform and internal tooling, handle customer inquiries, and deliver a project to improve security controls.

CrowdStrike Falcon

2 weeks ago

Twinstream Limited

Senior IT Systems Administrator

  • Bristol
  • Hybrid · 3 days in office
  • £50,000 – £60,000 pa
  • Senior

Hands-on senior role taking operational ownership of a corporate IT estate, managing cloud services, Microsoft 365, Entra ID, networking, endpoint security and automation. Involves leading complex incident resolution, patching, backups and business continuity while mentoring colleagues and working with suppliers alongside the IT Technical Lead.

Microsoft 365 · Entra ID · Intune +7

DV clearance Last month

Palo Alto Networks

Principal Consultant, Incident Response (Unit 42)

  • London
  • Remote
  • Lead

Lead and deliver reactive incident response engagements for clients, managing scoping, forensic investigations and containment of security incidents. Perform host-based analysis across Windows, Linux and macOS, examine firewall, web and database logs, and use tools such as EnCase, FTK, X-Ways, SIFT and Splunk to determine breach scope. Also mentors junior team members and provides remediation guidance to customers.

EnCase · FTK · X-Ways +5

SC clearance 2 months ago

Experis · 501–1000 people · Late stage

Senior Security Operations Analyst

  • Manchester
  • Hybrid · 3 days in office
  • £54,000 – £55,000 pa
  • Senior

Day-to-day operation of a SIEM platform, including monitoring, administration and optimisation, plus developing detection rules and investigating alerts through to resolution. Works with Infrastructure, Networking, DevOps and external partners on incident response, EDR management and control testing, with Google SecOps (Chronicle) experience advantageous.

Google SecOps · Chronicle · SIEM +4

2 weeks ago

Reed

Security Engineer

  • Redhill
  • On-site
  • £50,000 – £52,500 pa
  • Mid-level
  • Permanent

Hands-on security engineering role owning security operations, defining standards and responding to incidents across internal and customer networks. Involves monitoring threat intelligence, vulnerability assessments, and building SIEM and IDS/IPS solutions, with Cisco networking and compliance work (ISO27001, GDPR). Requires SC clearance eligibility and at least five years in secure network environments.

Cisco · Juniper · Linux +7

SC clearance Today

ECS Resource Group

Network Cyber Security Architect

  • Newbury
  • Remote
  • £450 – £500 pd
  • Senior
  • Contract

Security architecture and independent assurance role on a large-scale telecoms programme, focused on Privileged Access Management and securing administrative access to critical Network Management Systems. You will review network and security designs, assure HLDs, LLDs, PoCs and test strategies, and advise on segmentation, least privilege and secure management access. Requires strong IP networking (MPLS, VPNs, VRFs) plus AAA, TACACS+, MFA and RBAC expertise.

PAM · TACACS+ · MPLS +2

3 weeks ago

Risk Ledger

Senior IT Engineer

  • London
  • Hybrid · 2–3 days in office
  • £55,000 – £65,000 pa
  • Senior

Owns the entire IT estate for a cybersecurity SaaS company, covering identity and access management, macOS device management, SaaS administration and end-to-end joiners, movers and leavers. An engineering-led role focused on automation, AI enablement and security controls that support SOC 2, ISO 27001 and Cyber Essentials Plus audits, working alongside the Director of Information Security and a Senior SecOps Engineer.

macOS · MDM · SSO +6

Last week

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