About the Role

We are seeking an experienced L3 Security Engineer to lead security engineering, architecture, and continuous improvement across multiple customer environments within a Managed Service Provider (MSP).

This senior technical role goes beyond security monitoring and alert triage. You will design and implement security controls, lead vulnerability remediation, strengthen compliance, resolve complex security incidents, and establish consistent security standards across customer environments.

Working closely with infrastructure teams, service desk engineers, Account Managers, and customers, you will take ownership of security outcomes while mentoring junior engineers and driving a proactive approach to cybersecurity.

About the Client

You will be working with a technology and managed services provider supporting multiple customer environments. The organisation is focused on strengthening cybersecurity, improving service delivery, and developing scalable security standards that help customers reduce risk and maintain resilient IT environments.

Ideal Profile

Technical Expertise

Significant experience within an MSP, MSSP, or IT Service Provider environment

Strong hands-on experience with Microsoft Defender and its security ecosystem

Advanced experience with Sophos Firewall and endpoint security technologies

Proven experience managing vulnerability and patch management programs

Experience implementing security controls across Microsoft 365 environments

Strong knowledge of Microsoft Entra ID and Zero Trust security principles

Solid understanding of networking fundamentals, including TCP/IP, DNS, DHCP, VLANs, routing, firewalls, VPNs, and network segmentation

Strong Windows Server and endpoint troubleshooting capabilities

Experience handling complex technical escalations and leading remediation activities

Ability to design and implement practical security improvements rather than simply identify risks

Security Platforms & Technologies

Hands-on experience with ConnectSecure and Huntress is highly desirable

Experience with Sophos ZTNA, Microsoft Intune, Microsoft Defender XDR, and Conditional Access is advantageous

Familiarity with Microsoft Defender for Endpoint, Office 365, Identity, and Vulnerability Management

Knowledge of Essential Eight, CIS Controls, NIST Cybersecurity Framework, and ISO 27001

PowerShell scripting and API-based automation experience is beneficial

Familiarity with MSP PSA platforms such as HaloPSA, ConnectWise, or Autotask

Relevant Microsoft, Sophos, or cybersecurity certifications are advantageous

Security Architecture & Compliance

Experience assessing security architectures and identifying technical weaknesses

Ability to translate compliance requirements into practical security controls

Strong understanding of cybersecurity threats, attack techniques, and defensive measures

Experience developing remediation strategies, security baselines, and technical standards

Ability to prioritise vulnerabilities based on exploitability, exposure, asset criticality, and business impact

Leadership & Communication

Strong written and verbal English communication skills

Excellent technical documentation and reporting capabilities

Ability to lead complex remediation activities and provide technical direction

Confidence making technical decisions and challenging inadequate security practices

Strong problem-solving skills and a methodical approach to incident investigation

Ability to remain calm during critical incidents while considering customer priorities and operational impact

A proactive mindset focused on root causes, automation, standardisation, and preventing recurring issues

Responsibilities

Security Architecture & Technical Leadership

Act as a senior technical authority for security across multiple customer environments

Design, review, and improve customer security architectures

Establish security standards, recommended configurations, and repeatable best practices

Identify architectural weaknesses and develop remediation roadmaps for complex or high-risk issues