Senior Security Architect

develop; Greater London; Hybrid; GBP 99,000 - 121,000; Full time

Benefits offered by this job

Up to £110,000 salary

Benefits package

Remote or hybrid working

Job summary

A well-established organization is seeking a Senior Security Engineer/Architect to enhance its security posture. This role involves leading technical discussions, designing security solutions, and working hands-on with various security technologies, particularly within the Microsoft ecosystem. The position allows for either remote or hybrid working, offering a competitive salary up to £110,000 plus benefits. Candidates must have strong communication skills, automation experience, and familiarity with security frameworks.

Qualifications

• Demonstrable experience in Microsoft security technologies.
• Proven ability to write and tune detection logic (e.g. KQL).
• Experience working in customer-facing roles.

Responsibilities

• Lead technical discussions and architectural design.
• Own delivery of security solutions.
• Design detections and automation workflows.

Skills

Strong experience in Microsoft security ecosystem

Knowledge of identity and endpoint security

Excellent communication skills

Automation experience with PowerShell/Python

Tools

Microsoft Sentinel

KQL

API integrations

PowerShell

Job description

Senior Security Engineer/Architect – Perm – Up to £110,000 + benefits

Must already hold or be eligible for SC level security clearance

Remote first or Hybrid – London based office

Overview

An established organisation is seeking a Senior Security Engineer to help shape and enhance the security posture of the environments it supports. This role operates at the intersection of deep technical expertise, advisory ownership, and real-world security impact.

The successful candidate will work closely with customers, engineers, and operational security teams to deliver meaningful improvements across identity, detection engineering, endpoint security, and cloud security posture. This is a hands‑on role involving the design and implementation of modern security architectures, solving complex technical challenges, and acting as a trusted technical partner.

Technology Environment

Microsoft Security Stack:

• Microsoft Sentinel

Experience with alternative modern security platforms such as SentinelOne or CrowdStrike is advantageous.

• Exposure to AWS or GCP (desirable)

Platforms & Infrastructure:

• Active Directory / Entra hybrid identity
• Windows Server and Linux

Tooling & Automation:

• KQL
• PowerShell
• API integrations
• Automation tooling

Key Responsibilities

Technical Delivery

• Lead technical discussions with customers, guiding architecture, design decisions, and best practice implementations.
• Own the end‑to‑end delivery of security solutions.
• Design and implement detections, automation workflows, and runbooks.
• Conduct technical assessments across identity, endpoint, cloud posture, logging, and security operations.
• Develop, optimise, and tune KQL queries for detection engineering and threat hunting.
• Review and enhance security configurations across cloud and SIEM/SOAR platforms.
• Manage engagements through architecture, deployment, tuning, documentation, and customer enablement.
• Identify security gaps and recommend improvements across logging, identity, endpoint hardening, cloud posture, and threat detection.
• Understand how endpoints, servers, domain controllers, and cloud workloads operate, and how security controls integrate with them.
• Support remediation of misconfigurations and optimisation of security deployments.
• Leverage scripting, APIs, and automation to streamline repeatable tasks.
• Integrate firewalls, EDR platforms, logging pipelines, and SIEM/SOAR tooling.
• Act as a trusted technical advisor to security and engineering stakeholders.
• Communicate complex technical concepts clearly to both technical and non‑technical audiences.
• Translate customer requirements into actionable technical plans and deliverables.
• Collaborate with internal engineering, SOC, and platform teams to improve processes and share insights.
• Contribute to knowledge articles, design documentation, runbooks, and reusable delivery patterns.

Required Experience

• Strong, demonstrable experience across the Microsoft security ecosystem.
• Solid understanding of identity and endpoint security fundamentals.
• Proven experience writing and tuning detection logic (e.g., KQL) for detection engineering and threat hunting scenarios.
• Excellent communication and customer‑facing skills, with the ability to lead discussions and influence outcomes.
• Ability to work autonomously, solve complex problems, and deliver high‑quality technical solutions.
• Automation experience (PowerShell, Python, API integrations) and/or systems administration background.
• Familiarity with security frameworks and incident response methodologies.
• Experience working with logging pipelines (e.g., AMA, Syslog, Cribl, SIEM tooling).
• Exposure to non‑Microsoft security platforms such as CrowdStrike, SentinelOne, or Tenable.
• Experience producing architecture documents, diagrams, and technical design proposals.
• Background in an MSSP, consultancy, or customer‑facing engineering environment.

What the Role Offers

• Ownership of technical direction across engagements with the ability to influence customer security posture.
• A blend of architecture, engineering, advisory, and hands‑on implementation work.
• Exposure to a diverse range of environments, threat models, and operational challenges.