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Start for FreePrasanna Srikar T.
Cyber Security Engineer @HF Sinclair
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WORK HISTORY
Cyber Security Engineer @HF Sinclair
TX, US
Monitored, analyzed, and responded to real-time security incidents across on-premises and cloud environments using SIEM tools like Splunk and ELK.Used Nessus and Wireshark for vulnerability scans, packet analysis, and traffic inspection to enable early threat detection and response.Collaborated with OT teams to secure SCADA and ICS systems, ensuring proper IT/OT network segmentation.Enabled continuous monitoring of OT assets by integrating SCADA telemetry and logs into SIEM dashboards for centralized visibility.Evaluated vulnerabilities in PLCs, RTUs, and HMIs, coordinating remediation per ISA/IEC 62443 standards and corporate risk policies.Managed and secured Active Directory, including GPOs, RBAC, and user privilege audits.Hardened AWS environments through IAM configurations, Security Hub, GuardDuty, and CloudTrail to detect misconfigurations and threats.Performed vulnerability assessments and risk analysis using CVSS, aligning remediation with business impact and compliance needs.Developed and maintained incident response plans, playbooks, escalation workflows aligned with NIST 800-53 and ISO 27001.Created access control and response procedures for SCADA networks to reduce risks of lateral movement and unauthorized access.Worked with IT and Dev teams to integrate secure coding practices and DevSecOps into CI/CD pipelines.Authored PowerShell and Python scripts to automate threat intel enrichment, log parsing, and security validation.Managed EDR via CrowdStrike Falcon, conducting triage and root cause analysis during incidents.Tuned detections and correlated logs using KQL in Sentinel and SPL in Splunk to reduce false positives and boost visibility.Contributed to threat modeling and aligned detections with MITRE ATT & CK.Documented risk assessments, access controls, and audit reports using Jira and Confluence for cross-team visibility.Stayed updated on emerging threats, TTPs, and zero-days to support proactive threat hunting and control improvements.
EDUCATION
University of Central Missouri
Master's degree, CYBERSECURITY AND INFORMATION ASSURANCE
Jawaharlal Nehru Technological University, Kakinada
Bachelor's degree, Electrical, Electronics and Communications Engineering
ABOUT PRASANNA SRIKAR T.
As a Cyber Security Engineer at HF Sinclair, I focus on protecting critical infrastructure by monitoring and responding to security incidents using SIEM tools such as Splunk and ELK. My role emphasizes securing IT and OT environments, including SCADA systems, industrial control systems, and Active Directory. With over 9 years of experience, I specialize in vulnerability assessments, traffic inspection, and IT/OT network segmentation. Committed to risk management and compliance, I collaborate with cross-functional teams to uphold cybersecurity standards, including ISA/IEC 62443, and ensure the protection of critical assets in the Oil & Gas industry.
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