Microsoft Sentinel Engineer for MSSP Onboarding & Defender XDR

Integrity360; Greater London; On-site; GBP 90,000 - 130,000; Full time

Job summary

Integrity360 is seeking a Microsoft Security Engineer to onboarding clients to our MSSP service with Microsoft Sentinel at the core. You will configure workspaces, connectors and data flows, ensuring secure, compliant deployments and smooth handover to SOC.

You will also onboard Defender XDR workloads and collaborate with clients, architects and service teams to deliver repeatable, high-quality security engineering outcomes. Occasional travel may be required.

Qualifications

• Hands-on experience deploying, configuring or supporting Microsoft Sentinel in production or customer environments.
• Practical knowledge of Sentinel data connectors, Log Analytics workspaces, Azure Monitor Agent, Data Collection Rules, syslog and CEF collection patterns.
• Strong Kusto Query Language skills for data validation, troubleshooting, investigation and detection tuning.
• Experience onboarding and troubleshooting log sources across Microsoft 365, Azure, endpoints, identity, network, security and third-party platforms.
• Understanding of ingestion filtering, data transformation, parsing, normalisation, retention and the cost implications of security telemetry.
• Experience creating clear technical designs and delivery documentation, including HLDs, implementation plans, test records and operational handover materials.
• Working knowledge of Microsoft Defender XDR and the integration of its workloads with Microsoft Sentinel.
• Sound understanding of SIEM operations, detection engineering principles, incident workflows and the requirements of a managed security service.
• Strong troubleshooting skills across Azure, APIs, identity, networking and data collection components.
• Confident written and verbal communication skills, with the ability to work directly with technical and non-technical client stakeholders.
• Ability to manage assigned work independently while collaborating effectively with project, architecture, SOC and service teams.

Responsibilities

• Deliver end-to-end onboarding of client Microsoft Sentinel environments into the MSSP service.
• Configure Sentinel workspaces, content solutions, data connectors, analytics rules, automation rules, watchlists, workbooks and related components in accordance with approved designs and service standards.
• Run technical discovery sessions to identify log sources, connectivity requirements, data volumes, retention needs, dependencies and onboarding priorities.
• Onboard Microsoft, third-party, cloud, network, identity and application log sources using supported collection methods, including Azure Monitor Agent, Data Collection Rules, APIs, syslog, CEF and custom connectors where appropriate.
• Design and implement data filtering and transformation to improve signal quality, control ingestion costs and ensure the service receives the telemetry required for monitoring and detection.
• Validate data ingestion, parsing, field mapping, timestamps, health and coverage, and troubleshoot issues across source systems, collectors, networks and Azure services.
• Tune analytics rules, alert logic and incident generation in collaboration with SOC and detection engineering teams to reduce unnecessary noise while maintaining appropriate coverage.
• Onboard and integrate Microsoft Defender XDR workloads, including Defender for Endpoint, Defender for Identity, Defender for Office 365 and Defender for Cloud Apps.
• Produce accurate high-level designs, implementation plans, configuration records, test evidence, operational runbooks and handover documentation.
• Coordinate with clients, project managers, architects, SOC analysts and service teams to manage dependencies, risks, actions and readiness for service transition.
• Apply repeatable engineering standards, peer review and change control, and contribute improvements to onboarding templates, technical patterns and internal procedures.
• Support troubleshooting and remediation during onboarding and early-life support, escalating product or service dependencies where required.
• Undertake occasional travel where required to support client delivery.

Skills

Sentinel deployment

KQL (Kusto)

Azure Sentinel

SIEM operations

Threat detection

Tools

Azure Monitor Agent

Data Collection Rules

Log Analytics

Job description

Integrity360 is seeking a Microsoft Security Engineer to onboarding clients to our MSSP service with Microsoft Sentinel at the core. You will configure workspaces, connectors and data flows, ensuring secure, compliant deployments and smooth handover to SOC.

You will also onboard Defender XDR workloads and collaborate with clients, architects and service teams to deliver repeatable, high-quality security engineering outcomes. Occasional travel may be required.