Lead Information Security Engineer

• Location: Chesterfield, Missouri
• Type: Contract To Hire
• Job #7324

Position Overview: 

Job Title: Lead Information Security Engineer 

We are seeking a Lead Information Security Engineer to drive the design and implementation of enterprise data protection capabilities across Microsoft 365, endpoints, and cloud platforms. 

You will play a key role in protecting sensitive data across its full lifecycle, discovering, classifying, and securing data while reducing enterprise risk. You will work across multiple technologies and teams to ensure data security controls are scalable, actionable, and aligned to business and regulatory requirements. 

You will work cross-functionally with IT, Legal, Compliance, and business stakeholders to ensure sensitive data is?identified, classified, and protected across all endpoints, cloud workloads, and collaboration platforms. 

Key Responsibilities 

• Design, deploy, and tune DLP policies across Microsoft Purview DLP, covering Exchange Online, SharePoint, Teams, OneDrive, and endpoint devices? 

• Configure and manage labeling policies, trainable classifiers, and exact data match (EDM) for sensitive data types? 

• Integrate DLP capabilities with the Defender suite. Configure and manage Microsoft Defender for Endpoint and its Endpoint DLP component to monitor and control data on client devices. Leverage Microsoft Defender for Cloud Apps (MDCAS) for cloud-based DLP and real-time monitoring of SaaS applications. 

• Configure data connectors and analytic rules in Sentinel for DLP alerts and email security events.  

• Proactively monitor and analyze DLP-related false positives and negatives, working with business owners to refine policies and minimize disruption to business operations. 

• Develop robust testing and validation procedures for new and updated DLP policies. 

• Extend DLP coverage beyond Microsoft 365 to third-party SaaS platforms, on-premises systems, and network egress points?to reduce unauthorized data access and exfiltration 

• Collaborate with stakeholders to develop data handling standards and acceptable use policies?and establish consistent policy frameworks, enforcement models, and automation for data protection 

• Create and maintain technical documentation, runbooks, and Standard Operating Procedures (SOPs) for the Data Security program. 

• Build automation and scalable processes to reduce manual effort 

Data Security Posture Management (DSPM)? 

• Deploy and manage DSPM tooling to provide continuous visibility into sensitive data discovery, risk exposure, and access patterns? 

• Leverage Varonis for data access governance, entitlement reviews, and detection of abnormal data access behaviors across file shares, SharePoint, and cloud storage? 

• Conduct regular data risk assessments,?identify?overexposed sensitive data, and drive remediation with data owners? 

• Integrate DSPM findings into broader risk reporting and security metrics dashboards? 

• Produce regular reporting on policy effectiveness, data risk posture, and key security metrics for leadership? 

• Partner with data owners across business units to ensure proper classification of structured and unstructured data assets? 

AI Data Security 

• Support AI data security initiatives by helping govern and protect sensitive data used by generative AI, Copilot experiences, and AI agents. Partner to identify AI-related data exposure risks, improve visibility into prompt and response activity, apply data protection and governance controls, and align monitoring and remediation workflows with DSPM, Data Security, and Insider Risk Management objectives. 

Microsoft Intune 

• Engineer and maintain Intune solutions for endpoint management, including device enrollment, policy configuration, MDM/MAM to enforce data protection and compliance on managed devices. Ensure seamless integration between Intune's endpoint management capabilities and Defender/Purview DLP policies to support Windows, Mac, iOS and Android devices. 

• Implement end-to-end Microsoft 365 security and compliance solutions, including baseline security hardening, and integration with enterprise identity and access management. 

Microsoft Sentinel & SIEM Integration: 

• Configure data connectors and analytic rules in Sentinel for DLP alerts and email security events. Implement secure pipelines to forward logs and telemetry from Microsoft 365 and Sentinel to Splunk using Azure Event Hub, 

• Monitor and analyze Microsoft Sentinel cost drivers, including data ingestion, retention, and analytics rule execution. Implement cost optimization strategies such as data filtering, log sampling, and retention policy tuning. 

Work Experience 

• 7+ years of experience in information security, with at least?4?years focused on data security,?DLP?or?DSPM.? 

• Hands-on?expertise?with Microsoft Purview?DLP, including?policy creation, scoped deployments, adaptive protection, and incident management? 

• Strong?proficiency?with Microsoft Defender XDR suite: Defender for Endpoint, Defender for Cloud Apps, Defender for Identity, and Defender for Office 365? 

• Demonstrated experience with Microsoft Sentinel, including custom analytic rules, KQL query development, workbooks, and SOAR playbooks? 

• Proven experience with?Varonis Data Security Platform for data access governance, risk prioritization, and threat detection? 

• Experience with DSPM concepts and tooling, including sensitive data discovery and cloud data risk management? 

• Solid understanding of data classification frameworks and Microsoft Purview Information Protection (sensitivity labels, auto-labeling, trainable classifiers)? 

• Experience implementing DLP across multiple vectors: email, endpoint, cloud applications, and network 

• Demonstrated capability to analyze, operationalize, and continuously improve security controls and business processes  

• Knowledge of relevant compliance frameworks and regulations: ISO?27001/27701,?SOC?2?and?NIST?aligned?compliance and?security frameworks, particularly as they relate to data protection and DLP  

• Proven experience with email authentication standards (DMARC, SPF, DKIM) and their implementation in Microsoft 365. 

• Excellent analytical and problem-solving skills with a security-first mindset? 

Preferred Qualifications:  

• Microsoft certifications: SC-400 (Information Protection Administrator), SC-200 (Security Operations Analyst), SC-100 (Cybersecurity Architect), or AZ-500? 

• Experience with?additional?DLP or CASB platforms (e.g., Symantec DLP, Forcepoint, Zscaler)? 

• Familiarity with cloud security posture management (CSPM) in Azure, AWS, or GCP environments? 

Education? 

• Bachelor’s?degree in?arts/sciences (BA/BS) or equivalent experience