Security Engineer II, Managed Microsoft Sentinel

We help the world Be Everyday Ready™
Today's threatscape is relentless. So are we. At Cyderes, we specialize in building practical IAM, exposure management, and risk programs, and stopping active threats fast with MDR that works with your existing security tools — all augmented by AI and driven by seasoned operators. Our tireless global team is laser-focused on cybersecurity, arming organizations with the people, platforms, and perspectives they need to conquer whatever tomorrow throws their way.

About the Job:
The Security Engineer ll - Microsoft Sentinel & Defender XDR plays a critical engineering role within Cyderes Managed Sentinel SIEM and MDR services.

You will go beyond basic platform administration. The Security Engineer ll is responsible for detection engineering, platform optimization, onboarding lifecycle execution, and Defender XDR integration. You will be a trusted technical resource to clients, ensuring you configure, improve, and improve their Microsoft security ecosystem against evolving threats.

You will represent and strengthen the Cyderes brand through collaboration, and delivery that meets client expectations.

You will report to Senior Manager, Managed Platforms.

Responsibilities:
Platform Engineering & Administration

• Support intake process including coverage for Eastern Standard Time business hours
• Administer and maintain Microsoft Sentinel and Defender XDR environments across managed clients
• Perform health monitoring of:
• Log ingestion pipelines
• Data connector status
• Automation strategies
• Analytics rule performance
  
  
• Monitor ingestion volumes and support cost optimization projects
• Support tenant standardisation across multi-client MSSP environments
  
  

Log Source Onboarding & Integration

• Onboard new data sources into Microsoft Sentinel following established SOPs:
• Validate connectivity
• Confirm correct parsing and schema normalisation
• Ensure events are visible and queryable in Log Analytics
  
  
• Integrate Microsoft Defender data sources:
• Defender for Endpoint
• Defender for Identity
• Defender for Cloud Apps
  
  
• Validate data integrity and entity mapping
• Troubleshoot ingestion or connector issues across Azure and third-party integrations
  
  

Detection Engineering & Use Case Development

• Develop analytics rules (Scheduled, NRT, Fusion)
• Create and tune detection logic using KQL
• Reduce false positives through structured tuning and rule refinement
• Map detections to MITRE ATT&CK framework
• Improve alert fidelity and correlation between Defender XDR and Sentinel
• Maintain dashboards, workbooks, and reporting artefacts
• Help build reusable hunting and detection libraries
  
  

Monitor & Incident Support

• Monitor Sentinel and Defender XDR alerts
• Perform Tier 2 assessment and investigation of escalated alerts
• Provide clear documentation and escalation to MDR/SOC teams
• Support cause investigations for platform or telemetry issues
• Help with containment automation where applicable
  
  

Automation & SOAR

• Develop Azure Logic App guides
• Automate response actions such as:
• Device isolation
• User disablement
• IP blocking
• Ticket creation
  
  
• Follow change management processes for configuration updates
• Test changes in lower environments when applicable
  
  

Documentation & Continuous Improvement

• Contribute to:
• Runbooks
• Standard operating procedures
• Onboarding checklists
• Detection documentation
  
  
• Document false positives and data quality issues
• Provide tuning feedback to senior engineers and architecture teams
• Stay current on Microsoft security roadmap changes
  
  

Participate in internal training and knowledge-sharing sessions

Requirements
Education

• Diploma or Bachelor's degree in Computer Science, Cybersecurity, Information Technology, or related field (or equivalent experience)
  
  

Experience

• 3-5 years of experience in IT security, SOC, or security engineering roles
• Minimum 2 years hands-on experience with Microsoft Sentinel
• Experience with Microsoft Defender XDR suite
• Experience in MSSP or customer-facing environments
• Exposure to multi-tenant environments (Azure Lighthouse)
  
  

Technical Skills

• Working knowledge of:
• Microsoft Sentinel
• Microsoft Defender XDR
• Azure Log Analytics
  
  
• Proficiency in KQL
• Understanding of:
• Windows & Linux logs
• Azure AD / Entra ID
• Networking fundamentals (TCP/IP, ports, firewalls, or proxies)
• Authentication and authorization models
  
  
• Experience with:
• Azure Logic Apps
• REST APIs
• PowerShell or Python scripting
  
  
• Understanding of MITRE ATT&CK framework
• Familiarity with MDR operational workflows
  
  

Certifications

• SC-200 (Microsoft Security Operations Analyst)
• AZ-500 (Azure Security Engineer)
• SC-100 (Cybersecurity Architect)
• Security+
• Relevant Microsoft Defender certifications
  
  

This is a hybrid remote/in-office role.

WHY CYDERES
Benefits that go beyond the basics, we support our people so they can do their best work.

✔ Medical Insurance - Employee + dependents covered

✔ Life Insurance - Protection for what matters most

✔ Retirement Match Program - We invest in your future

✔ Hybrid Work Model - 2-3 days in office

✔ Maternity & Paternity Leave - Time for the moments that matter

✔ Paid Time Off - PTO + sick & casual leave

✔ Bereavement & Volunteer Time - Give back to your community

✔ Professional Development - Reimbursement program

✔ LinkedIn L&D Platform - Thousands of courses at your fingertips

✔ Mobile Phone Reimbursement - Stay connected, on us

Cyderes is an Equal Opportunity Employer (EOE). Qualified applicants are considered for employment without regard to race, religion, color, sex, age, disability, sexual orientation, genetic information, national origin, or veteran status.


Note: This job posting is intended for direct applicants only. We request that outside recruiters do not contact us regarding this position.


We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.