Mayank

Senior Cyber & Cloud Security Analyst

Tata Consultancy Services (TCS)

Dec 2016 - Feb 2025

Investigated and remediated security alerts in real time across endpoint, email, network, and cloud workloads using Splunk and Microsoft Sentinel, consistently meeting SLA targets for detection, triage, and closure. Led end-to-end incident response and remediation for phishing, malware, and intrusion attempts using Microsoft Defender 365 (EDR/XDR) and ServiceNow, mapping investigations to MITRE ATT&CK and Cyber Kill Chain to drive faster containment. Secured endpoint, email, network, and cloud environments end-to-end using Microsoft Defender for Endpoint, Defender for Office 365, Defender for Cloud, Fortinet, and Cisco IPS/IDS, hardening the organization's threat surface across a hybrid on-prem/Azure estate. Fine-tuned detection and alert logic across Splunk, Sentinel, and Defender EDR/XDR, reducing false-positive volume and improving analyst response time on high-priority incidents. Strengthened Azure cloud security posture through Defender for Cloud, DLP controls, and continuous compliance monitoring, supporting data-governance requirements for enterprise clients. Administered IAM/RBAC using Azure Entra ID, enforcing least-privilege access across hybrid environments to reduce unauthorized access risk. Ran recurring vulnerability assessments with Rapid7 InsightVM (Nexpose), prioritizing and driving remediation of critical/high findings with infrastructure teams. Recognized twice with TCS's Star of the Month and On-the-Spot awards for consistent performance in security operations.