Dinesh Purushothaman

CISM certified cybersecurity professional with 12+ years of experience in security operations, threat detection, and incident response, specializing in SIEM and cloud security within the Microsoft security ecosystem. Experienced in managing enterprise security monitoring using Microsoft Sentinel, Microsoft Defender suite, and identity security platforms. Proven ability to lead incident investigations, mentor SOC analysts, and collaborate with cross-functional stakeholders to strengthen organizational security posture.

Leveraging AI assisted security analytics, threat intelligence, and automation to improve detection accuracy and SOC operational efficiency. Strong experience supporting risk assessments, security governance, and compliance initiatives including ISO 27001 and SOC frameworks.

Senior Security Specialist at Kinaxis India Ltd (2023-02 – Present)

• Managed enterprise security monitoring across Microsoft Sentinel, Microsoft Defender suite, Azure/Entra ID, Cisco Umbrella, and Abnormal Security, improving threat detection, email security, and DNS-layer protection.
• Developed and optimized Microsoft Sentinel analytics rules, KQL-based threat hunting queries, and detection logic to improve threat visibility, reduce false positives, and strengthen detection coverage.
• Led end-to-end security incident investigations and response activities, including alert analysis, root cause investigation, coordination with internal teams, incident documentation, and post-incident reviews.
• Directed proactive threat detection and optimization efforts across multiple security domains, leveraging insights from identity, endpoint, network, and cloud telemetry to enhance detection coverage, reduce risk, and improve overall security posture. Utilized ZeroFox Digital Risk Protection platform to monitor and mitigate external threats such as phishing domains, brand impersonation, and social media abuse targeting the organization.
• Leveraged UpGuard and Wiz platforms to assess external attack surface exposure, cloud security posture, and third-party risk, providing remediation recommendations to reduce security risks.
• Mentored and guided L1/L2 SOC analysts, developed investigation runbooks, and built Microsoft Sentinel dashboards and workbooks to improve investigation consistency and SOC operational efficiency.
• Established and communicated actionable security metrics, incident trends, and risk insights to senior leadership, driving data-informed decision-making, strategic risk prioritization, and continuous improvement in the organization's security posture.
• Led security engineering improvements by expanding logging coverage, reducing monitoring gaps across cloud and infrastructure assets, and optimizing detection rules for improved threat coverage.
• Contributed to security audit and compliance programs, including ISO 27001 and SOC frameworks, through the coordination of security documentation, evidence collection, and control validation to support audit readiness and compliance objectives.

Senior Consultant - Cyber Security & Risks at MFX Infotech (2017-02 – 2023-02)

• Managed Identity and Access Management (IAM) including Okta and Multi-Factor Authentication (MFA), ensuring secure access controls and compliance with organizational security policies.
• Conducted vulnerability assessments and penetration testing using industry tools (Nessus, Nexpose, Burp Suite, OWASP ZAP, Kali Linux, Metasploit, Nmap) and provided remediation recommendations to reduce security risks.
• Monitored and analysed security events through SIEM platforms, supported SOC operations, and coordinated response and investigation of security incidents.
• Implemented and managed endpoint protection and EDR solutions including CrowdStrike, McAfee, Windows Defender, Cylance, and Carbon Black to strengthen endpoint security posture.
• Developed and enforced security controls such as application and web access policies, EDR, and threat prevention mechanisms.
• Supported enterprise security audits and compliance initiatives including ISO 27001, PCI DSS, SOC 1, and SOC 2 by preparing security documentation and audit evidence.
• Assisted in risk assessments, security governance activities, and implementation of security best practices to improve the organization's security posture.
• Followed ITIL-based incident and change management processes to ensure effective and compliant security operations.

Senior Support Engineer at Prodapt solutions Pvt Ltd (2015-02 – 2017-01)

• Assisted with technical support for Active Directory user management and access control issues.
• Provided support in resolving VPN login and remote connectivity problems to facilitate secure user access.
• Monitored network alerts and system health using IPMonitor and Zenoss, aiding in issue resolution.
• Helped manage user access provisioning, shared drive permissions, and network printer configurations across the organization.

Support Engineer at Medusind Solutions (2013-06 – 2014-08)

• Diagnosed and resolved technical issues while ensuring optimal system functionality.
• Document incidents and track resolutions effectively.
• Provided technical support to users and internal teams as needed, assist in troubleshooting issues to enhance user experience.

B.Tech. in Information technology – Balaji Institute of Engineering and Technology, Anna University (2012-04)