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Nagarajan TNT
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Nagarajan T

@nagarajant

Security Engineer at Zoho Corporation who built Python and LLM alert-triage automation and an AI-assisted SIEM platform.

India
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At Zoho Corporation, I operate the SIEM detection pipeline across Falcon LogScale and ManageEngine Log360, from log onboarding and custom parsers to ATT&CK-mapped rules and alert tuning. I also hunt for APT activity across EDR and SIEM data covering AWS, Azure, and on-prem workloads.

I built and deployed Python and LLM automation for L1–L3 alert triage, enriching alerts with IOC reputation and asset and user context. I use Claude and local Ollama models to draft detection rules, then test and tune each one before it goes live.

I lead L2/L3 incidents from triage and containment through recovery and root-cause analysis, and conduct forensic investigations with Magnet AXIOM and Cellebrite. My work also includes cloud workload hardening, vulnerability management, and data-exfiltration detection.

On my personal project LogSec, I built an AI-assisted SIEM and triage platform that runs on a local Ollama model, keeping log data within the network. Earlier, at Intellect Design Arena Ltd, I worked rotating shifts in a 24/7 fintech SOC and handled incidents, vulnerability scans, phishing analysis, and malware investigations.

Experience

Work history, roles, and key accomplishments

Zoho Corporation logoZC
Current

Security Engineer – SecOps (L2/L3)

Zoho Corporation

Aug 2025 - Present (1 year 3 months)

Operates the detection pipeline in Falcon LogScale and ManageEngine Log360 end to end, including log source onboarding, custom parsers, correlation rules mapped to MITRE ATT&CK, and alert tuning. Leads L2/L3 incidents, conducts forensic investigations, and secures AWS and Azure workloads.

Intellect Design Arena Ltd logoIL

SOC Analyst – Security Operations Center

Intellect Design Arena Ltd

Jun 2023 - Aug 2025 (2 years 2 months)

Worked rotating shifts in a 24/7 SOC, handling 1,000+ alerts a month from SIEM, EDR, antivirus, IDS, WAF, firewall, and DLP sources. Correlated events in IBM QRadar, FortiSIEM, and Microsoft Sentinel, owned P1–P3 incidents, and ran 150+ Nessus and Qualys scans monthly.

Education

Degrees, certifications, and relevant coursework

Manipal University Jaipur logoMJ

Manipal University Jaipur

Master of Computer Applications, Computer Applications

2024 -

Pursuing a Master of Computer Applications (MCA) degree, ongoing since 2024.

RS

Rathinam College of Arts and Science

Bachelor of Science, Computer Science

2020 - 2023

Activities and societies: Presented 'IAC Application – Industrial Automation with Cloud Application' at ETEST-23, a national ISTE-sponsored conference (2023).

Completed a Bachelor of Science in Computer Science with a focus on Cloud Technology and Information Security. Coursework included Cloud Computing, Linux, and Ethical Hacking. Presented a project at a national conference.

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