March 7, 2026

Summary

A security operations provider delivering Microsoft-centric security services needed to scale its client onboarding capabilities. The firm served a diverse portfolio of enterprises, including those in heavily regulated sectors like finance and insurance. Core offerings included managed services for Microsoft Defender, Microsoft Sentinel, and a comprehensive Managed Detection and Response (MDR) solution.

Challenge

The existing client onboarding process was largely manual and bespoke for each engagement. This approach limited the provider’s ability to scale, created inconsistencies in service delivery, and increased the operational overhead for the technical teams. To support business growth, a more streamlined, repeatable, and efficient model was required to integrate new clients without compromising the quality of security outcomes.

Objectives

• To design and document standardised, repeatable onboarding processes for Microsoft Defender for Endpoint, Microsoft Sentinel, and the firm’s MDR service.
• To create a library of reusable technical assets to accelerate deployment and ensure configuration consistency.
• To improve the overall efficiency and reduce the time-to-value for new clients joining the managed service.
• To establish a robust framework that could be adapted for different client environments while adhering to industry best practices.

Approach and Delivery

The challenge was approached by treating the internal service delivery function as a product that required optimisation. The workstream moved beyond individual client projects to focus on building a scalable delivery engine.

The initial phase involved a full analysis of the client lifecycle, from pre-sales and solution design through to final handover to the Security Operations Centre (SOC). Key bottlenecks and areas for standardisation were identified. For each new client, a rigorous security posture assessment was conducted using automated tools and PowerShell scripting. This made it possible to map each client environment, identify high-value log sources for SIEM/XDR ingestion, and pre-tune detection rules to reduce false-positive noise before the MDR service went live. The entire refined process was captured in detailed Statements of Work (SOWs) and internal process documentation to guide future deployments.

Technical Implementation

To bring the standardised process to life, a set of tangible, code-driven assets was developed.

• Configuration-as-Code Frameworks: CIS-compliant security frameworks were created for both Microsoft Intune and Azure. These were developed entirely as transferable PowerShell scripts, enabling rapid, consistent, and error-free deployment of baseline configurations.
• Adaptable Policy Packs: Plug-and-play Attack Surface Reduction (ASR) rule policies were built within Intune. These were designed to be easily adaptable to the specific needs of different client environments, providing a strong security baseline out-of-the-box.
• Automated Assessments: The initial security posture assessment was enhanced with scripts to automate the discovery of network assets and system configurations, ensuring no critical components were missed during integration planning.
• Standardised Documentation: Detailed Visio architecture diagrams were produced for every client, creating a clear and consistent visual record of the deployed solution.

Outcome

The initiative successfully transformed the provider’s service delivery capability from a manual, project-based model to a scalable, process-driven operation.

• Standardised onboarding processes for Microsoft Defender, Sentinel, and MDR services were successfully designed, documented, and implemented.
• The creation of a configuration-as-code library significantly improved deployment efficiency and consistency.
• The enhanced quality of delivery and successful client integrations contributed directly to the provider achieving the ‘Advanced Threat Specialisation’ with Microsoft.
• The new model enabled the business to onboard more clients more effectively, supporting its commercial growth objectives.

Risks, Controls and Governance

• Risk: Standardised policies could conflict with diverse client environments.
• Control: A mandatory, in-depth architecture assessment was performed for every client before deployment to identify and plan for any necessary customisations.
• Risk: ‘Plug-and-play’ rules might be overly restrictive.
• Control: The ASR rule policies were designed to be adaptable, with comprehensive documentation provided to guide tailoring for specific operational requirements.
• Governance: Strict documentation standards were enforced. Every client engagement was governed by a detailed Statement of Work, and all changes were managed through a formal change request process, ensuring a full audit trail for all deliverables.

Key Lessons

• Treating internal delivery processes as a scalable product is fundamental to growing a managed services business effectively.
• Investing in configuration-as-code (IaC) using tools like PowerShell is critical for ensuring consistency, reducing manual errors, and enforcing security best practices at scale.
• A thorough, automated pre-onboarding assessment phase is vital. Tuning rules and understanding the client environment before go-live significantly reduces operational noise for the SOC and demonstrates immediate value.

Related Services

• Sentinel Deployment & Integration
  Deploy Microsoft Sentinel with structured data onboarding, workspace design, RBAC, and detection content so your SOC operates effectively and predictably.
• Defender for Endpoint (EDR)
  Deploy and operationalise Defender for Endpoint with phased onboarding, tuned policies, and clear triage workflows across managed device estates.
• Microsoft Intune Deployment & Optimisation
  Design, deploy and optimise Microsoft Intune for consistent enrolment, policy enforcement, application management and compliance across modern device platforms.
• SOC Use-Case & Detection Engineering
  Define SOC detection use cases and engineer Microsoft Sentinel analytics rules mapped to risk, reducing noise and improving incident focus.