We’ll help you succeed in a globally connected powerhouse of diverse teams and take your career wherever you want it to go. Join EY and help to build a better working world. Ernst & Young is seeking junior and intermediate-level technical security professionals with hands‑on expertise in Microsoft Sentinel and Microsoft Defender to support our Managed Detection and Response (MDR) services within a Security Operations Center (SOC) environment.

The successful candidate will operate in a client‑facing MSSP environment and will contribute directly to the quality, effectiveness, and continuous improvement of EY’s MDR services. This job posting relates to an existing vacancy within our organization. Working with our technical team and clients the candidate will be responsible for: Security Monitoring and Incident Response Perform security monitoring, triage, and investigation of alerts generated from Microsoft Sentinel and Microsoft Defender platforms using documented playbooks.

Escalate confirmed or complex incidents, including suspected compromise, lateral movement, persistence mechanisms, and data exfiltration scenarios. Validate, scope, and document security incidents, including root cause analysis and impact assessment. Assist with containment and recovery under senior guidance.

Support tuning and maintenance of Sentinel analytics rules. Assist with false positive reduction and improving signal quality across Sentinel and Defender data sources. Support threat hunting activities Document hunting hypotheses, findings, and recommendations for detection improvements or control gaps.

Client

Engagement and Technical Advisory Supporting onboarding and steady‑state operations Support senior team members in identifying logging, configuration improvements. Support onboarding and steady‑state operations for MDR clients within a managed services context.



Assist with service quality improvements, detection maturity, and operational consistency across clients.

Ensure investigations and responses align with applicable regulatory, contractual, and evidentiary requirements. Hands‑on expertise with Microsoft Sentinel, including analytics rules, KQL, workbooks, and incident investigations.

Experience with Microsoft Defender technologies, including Defender for Endpoint and identity‑related signals. Working understanding of attack techniques, threat actor behaviors, and incident response methodologies. Ability to manage multiple investigations simultaneously while maintaining investigation quality and documentation.

Robust written and verbal communication skills, with the ability to explain technical findings to security‑focused audiences. Proficiency in French, including Quebec French, is desired for client facing engagements. Bachelor’s degree in Computer Science, Information Technology, Cybersecurity, or a related discipline.

Microsoft Certified: Microsoft Sentinel specialization Minimum 1-2 years of experience in cybersecurity operations, with significant time spent in incident response and security monitoring roles. Prior experience in a client‑facing or managed services environment is strongly preferred Individual salaries within the anticipated salary ranges noted below are determined through a wide variety of factors including but not limited to internal equity, education,



relevant experience, knowledge, and applicable skill sets. We’re committed to fostering an environment where differences are valued, policies and practices are equitable, and our people feel a sense of belonging.

We embrace diversity and are committed to combating systemic racism, advancing gender equity and women in leadership, advocating for the 2SLGBTQIA+ community, promoting our neuroinclusion and accessibility initiatives, and are dedicated to amplifying the voices of Indigenous peoples (First Nations, Inuit, and Métis) nationally as we strive towards reconciliation. Our diverse experiences, abilities, backgrounds, and perspectives make our people unique and help guide us. EY | Building a better working world

EY is building a better working world by creating new value for clients, people, society and the planet, while building trust in capital markets. Enabled by data, AI and advanced technology, EY teams help clients shape the future with confidence and develop answers for the most pressing issues of today and tomorrow. EY teams work across a full spectrum of services in assurance, consulting, tax, strategy and transactions.

Fueled by sector insights, a globally connected, multi-disciplinary network and diverse ecosystem partners, EY teams can provide services in more than 150 countries and territories. At EY, we use artificial intelligence (AI) tools as one element of our recruitment process to enhance efficiency and improve the candidate experience. While AI supports us in our process, human judgment and decision‑making remain integral in our candidate experience.

We are committed to the responsible use of AI, and our practices are continuously reviewed and refined to ensure they align with ethical principles and regulatory requirements.

📌 Cybersecurity - Cyber Managed Services (Security Operations Analyst) - Consultant (St. John's)
🏢 EY
📍 St. John's