Rengaraj D
Chennai
Summary
Experienced IT Infrastructure Engineer with over 5 years of expertise in Linux and Windows Server administration. Skilled in networking, including LAN/WAN management and IT infrastructure oversight. Demonstrated ability to lead technical teams, resolve system issues, and enhance performance in enterprise environments. Specialized as a Hardware & Networking Engineer, with a strong background in network design and LAN/WAN configurations.
Overview
10
10
years of professional experience
2011
2011
years of post-secondary education
1
1
Certification
2
2
Languages
Work History
Assistant Manager – Technical
Door Sabha Nigam Limited
04.2024 - 01.2025
- Installed, configured, and maintained Linux distributions (CentOS, Ubuntu, RHEL) across 150+ servers
- Managed GSuite Workspace and O365 administration, supporting 200+ employees
- Led a team of 5 engineers, managing IT operations
- Granted and managed VPN access, ensuring secure connectivity
- Collaborated with the sales team to provide customer solutions
- Analyzed system logs and traces to troubleshoot issues
- Optimized SQL queries and performed database backups/restorations
- Handled IT procurement, ensuring timely acquisition of hardware and services
- Managed IP allocations for over 150 devices and conducted periodic network audits
Senior Engineer
Door Sabha Nigam Limited
04.2023 - 03.2024
- Installed and maintained Gateway servers for telecom connectivity (ISDN/PRI, SIP)
- Configured firewall policies on WatchGuard XTM 505, enhancing security
- Managed VLANs, routers, and access points for optimal network performance
- Monitored system performance using Nagios, ensuring uptime
- Created network diagrams and maintained technical documentation
- Trained junior engineers and improved overall team efficiency
- Performed preventive maintenance to ensure system stability
Engineer
Door Sabha Nigam Limited
01.2021 - 03.2023
- Installed system software and upgrades periodically
- Maintained and repaired servers, routers, switches, and backup systems
- Conducted preventive maintenance on IT hardware and peripherals
- Provided remote support for various locations
- Managed IT support tickets via Smarter Tracker, ensuring timely resolution
IT Executive
Altruist Customer Management India Pvt Ltd
05.2019 - 01.2021
- Managed Windows Server (2003, 2008, 2016) and Active Directory
- Handled domain user IDs, OU movements, and password resets
- Designed, configured, and installed network devices
- Applied Group Policies (GPOs) for enhanced security compliance
- Performed daily backups using Symantec Backup Exec and LTO tape drives
- Managed Cisco ASA 5525-X Firewalls and Catalyst 3560G Switches
Credit Verification Officer
IndusInd Marketing and Financial Services Pvt Ltd
12.2014 - 04.2019
- Reviewed and verified financial documents for creditworthiness
- Ensured compliance with company credit policies and regulations
- Analyzed CIBIL reports to assess financial risk
Education
Bachelor of Computer Science Engineering -
Annamalai University
Skills
Cisco Certified Network Associate
Network Infrastructure Management
TCP/IP Network Configuration
CentOS System Management
Experience with Ubuntu
Experience with Google Workspace
Experienced with Office 365 Suite
NoSQL Database Management
AWS (EC2,IAM,S3)
Active Directory Management
Group Policy Management
Management of Organizational Units
Virtual LAN Configuration
Certification
Cisco Certified Network Associate (CCNA) - Cisco Systems.
Personal Information
Date of Birth: 07/06/89
Marital Status: Married
Address : No 9, Suriyan Street, Sekar Nagar, New Perungalathur, Chennai-600 063.
Disclaimer
I hereby declare that all the details furnished above are true to the best of my knowledge.
Place: Chennai
Date:
D. Rengaraj
Timeline
Assistant Manager – Technical
Door Sabha Nigam Limited
04.2024 - 01.2025
Senior Engineer
Door Sabha Nigam Limited
04.2023 - 03.2024
Engineer
Door Sabha Nigam Limited
01.2021 - 03.2023
IT Executive
Altruist Customer Management India Pvt Ltd
05.2019 - 01.2021
Credit Verification Officer
IndusInd Marketing and Financial Services Pvt Ltd
12.2014 - 04.2019
Bachelor of Computer Science Engineering -
Annamalai University