SDE Consultant

About the Role

We’re looking for a highly skilled Senior Security & Infrastructure Engineer (SDE) to play a key role within a Managed Service environment supporting a high-profile customer. In this position, you’ll lead on proactive support, technical delivery, and continuous improvement of managed services. Acting as the highest point of technical escalation, you’ll work closely with customer stakeholders, internal teams, and project staff to deliver secure, resilient, and best-in-class solutions. This is a hands-on, technically advanced role with a strong focus on security operations, infrastructure protection, and service excellence.

What You’ll Be Doing

Security Operations

• Monitor and respond to security alerts, threats, and incidents across infrastructure and cloud environments
• Investigate complex incidents (malware, phishing, unauthorised access, vulnerabilities)
• Implement and maintain security controls across systems and endpoints
• Work with SIEM, endpoint protection, and threat detection tools

Infrastructure & Cloud Security

• Secure servers, networks, and cloud platforms in line with best practices
• Manage identity and access controls (Active Directory, Azure AD, privileged access)
• Oversee patching, system hardening, and configuration management
• Lead security onboarding using tools like Microsoft Defender and Purview

Incident Response & Threat Management

• Lead technical investigations and remediation activities
• Conduct root cause analysis and recommend preventative measures
• Support forensic investigations when required

Vulnerability & Risk Management

• Perform vulnerability assessments and coordinate remediation
• Identify risks and recommend security improvements
• Collaborate across teams to reduce organisational risk

Technical Leadership & Escalation

• Act as the senior escalation point for complex issues
• Support and mentor Service Desk and 2nd/3rd Line engineers
• Provide technical input into new managed service opportunities

Compliance & Best Practice

• Support compliance frameworks (ISO 27001, Cyber Essentials, NIST)
• Assist with audits and ensure adherence to policies and standards

Continuous Improvement

• Enhance processes, tooling, and documentation
• Drive automation and improved monitoring capabilities
• Stay current with emerging threats and technologies

What We’re Looking For

Essential Skills & Experience

• 5+ years in a Managed Services environment
• Strong knowledge of security operations and infrastructure security
• Experience with Microsoft 365, Azure, and cloud security
• Virtualisation experience (VMware & Azure)
• Backup solutions (Veeam, Azure Backup)
• Networking knowledge (routing, switching, VLANs, firewalls, VPNs)
• Experience with SIEM and security monitoring tools
• Familiarity with Microsoft Defender, Endpoint Protection, or similar tools
• Strong understanding of ITIL frameworks
• Excellent communication and stakeholder engagement skills

Desirable

• Security certifications (CompTIA Security+, Microsoft SC-200/300/100)
• Knowledge of ISO 27001, NIST, CIS benchmarks
• Experience with ITSM tools
• BPSS or SC Clearance

Additional Information

• Travel to customer and [Employer hidden] offices may be required
• Participation in a 24/7 on-call rota (subject to approval)
• Occasional out-of-hours work for maintenance/releases (TOIL provided)