Platform and Cyber Security Specialist - Hybrid

Ashdown Group; Greater London; Hybrid; GBP 55,000 - 65,000; Full time

Benefits offered by this job

Hybrid work model

Generous pension

Job summary

Ashdown Group is seeking a Platform & Cyber Security Specialist to lead security across a hybrid cloud environment in a large organisation. The role focuses on securing the Windows/Microsoft 365 stack and modernising security controls during IT transformation.

You will manage Entra end-to-end, configure Defender tools, and ensure robust identity, access, and device security. Hybrid work pattern is offered with salary £55,000–£65,000 plus benefits.

Qualifications

• Strong understanding of cyber security principles and IAM.
• Experience with Hybrid Exchange and Entra ID management.
• Experience with Defender products and incident response.
• Proficient in AD, DNS/DHCP and certificate services.
• Familiar with Intune and endpoint security controls.

Responsibilities

• Own platform and security controls across cloud and on-prem environments.
• Configure and manage Microsoft Entra, PIM, Conditional Access and MFA.
• Monitor, investigate and respond to threats and incidents.
• Manage SSL certificates, VPN estate and DNS/DHCP configurations.
• Develop PowerShell scripts to automate security tasks.

Skills

Cyber security principles

Identity and access management

Hybrid Exchange environments

Microsoft Entra ID

Microsoft 365 Defender

Active Directory management

Microsoft Intune

VPN technologies

PowerShell scripting

Tools

Office 365 Defender

Sentinel

Job description

We are seeking a Platform & Cyber Security Specialist to work within a large organisation as they move through an IT transformation programme. This is a key role where you will help deliver and secure the organisation’s cloud-first technology environment, ensuring their digital services remain modern, resilient and secure. This is a hybrid role based 3 days a week at their offices in North West London and 2 days working from home.

The Platform and Cyber Security Specialist will take ownership of the platforms, cyber security controls and emerging technologies that underpin the organisation’s digital environment. This includes managing the Microsoft Entra environment end to end — from Entra Connect, ID objects, and licensing through to security controls such as PIM, Conditional Access, MFA, and SSPR.

You’ll also configure and manage security across Office 365 and endpoints, including Defender RBAC and Defender for Cloud Apps, staying ahead of emerging threats by investigating alerts and incidents, monitoring and remediating risks and generating audits and reports, alongside safeguarding the organisation from spam and phishing through Microsoft 365 email remediation, eDiscovery, and retention policy configuration. Additionally, you’ll be responsible for SSL certificates and the wider VPN estate, applying a strong understanding of DNS, DHCP, and name resolution to configure SSL VPN profiles and maintain a robust security posture.

Key skills

• Strong understanding of cyber security principles, identity and access management and MS security best practices.
• Experienced with Hybrid Exchange environments, including Exchange Online and on-premises services.
• Skilled in managing Microsoft Entra ID environments, including Conditional Access, MFA, SSPR, PIM, and identity lifecycle management.
• Experience of Microsoft 365 Defender and Sentinel to monitor, investigate, and respond to security threats and incidents.
• Strong knowledge of Active Directory management, including Group Policy, DNS, DHCP, domains, trusts, replication, and certificate services.
• Familiar with Microsoft Intune and endpoint management including device security and compliance policies.
• Knowledge of VPN technologies, SSL certificates, and core networking concepts
• Proficient in PowerShell scripting and automation

This is a great opportunity to play a leading role in maintaining secure, resilient and highly available technology services that support the delivery of critical services. The role is hybrid based and offered with a salary range of between £55,000-£65,000 depending on experience plus a very generous pension and other benefits.