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Arunkumar Kuppusamy, Sr. Network & Security Engineer

Arunkumar Kuppusamy

Sr. Network & Security Engineer·Starlink / Ooredoo

Qatar

Bachelor's degree, Electronics and Communication Engineering

Work experience

Total years of experience: 11 years, 7 months

Sr. Network & Security Engineer

February 2024 - March 2026

Starlink / Ooredoo

Doha, Qatar

February 2024 - March 2026

• Managed user accounts, account provisioning, password resets, and access-level policies
across Microsoft 365 environments supporting 25, 000+ users.
• Performed daily system monitoring, verified integrity and availability of hardware, server
resources, and key processes; reviewed system and application logs and confirmed
scheduled jobs (backups, upgrades).
• Administered Active Directory infrastructure including group policies, security permissions,
and organizational units.
• Integrated wireless infrastructure with Cisco ISE and HPE ClearPass for 802.1X
authentication, NAC enforcement, and role-based access control, enhancing security
posture across OT/IT networks.
• Designed and maintained enterprise network architecture including Cisco Catalyst/Nexus
switching, ASR routing, and VLAN segmentation aligned with SLA requirements.
• Delivered L2/L3 incident response and resolution for P1/P2/P3 network and security events,
led RCA reports and drove corrective/preventive actions to closure.
• Troubleshot network connectivity issues (VLAN, DHCP, WiFi, TCP/IP) and ensured reliable
access across classrooms and offices.
• Maintained backup and disaster recovery solutions; conducted regular verification and
restoration drills to ensure business continuity.
• Created technical documentation including troubleshooting guides, knowledge base
articles, system configurations, and SOPs.

Company industry:
Telecommunications
Job role:
Information Technology

Network and Security Engineer

February 2019 - February 2024

Diyar United Company

Doha, Qatar

February 2019 - February 2024

• Provided escalated IT support for enterprise servers, networks, applications, and security
systems with minimal downtime.
• Implemented and maintained virtualization platforms (VMware vSphere, Hyper-V), managing
resource allocation and high availability.
• Configured switches, routers, firewalls (Fortinet/Cisco), and wireless access points; applied
security controls per organizational policy.
• Proactively managed customer IT security posture, reducing system compromise events
and minimizing incident impact through continuous monitoring and action.
• Correlated security events across multiple data sources; mapped adversary behaviors to
MITRE ATT&CK, enhancing detection accuracy and incident response effectiveness.
• Conducted root cause analysis for complex wireless incidents across IT/OT environments,
delivering executive-level incident reports and technical recommendations.
• Supported IT projects including system upgrades, technology migrations, and infrastructure
enhancements.

Company industry:
IT Services
Job role:
Information Technology

Senior System Administrator

August 2014 - December 2018

Al Bandary Engineering

Doha, Qatar

August 2014 - December 2018

• Managed enterprise IT infrastructure for 500+ users: Active Directory, Exchange Server, file
servers, backup systems, and network storage.
• Led Microsoft 365 migration from on-premises Exchange with zero data loss; implemented
collaboration tools and delivered user training.
• Performed daily system administration: user provisioning, mailbox management, security
group configuration, and technical issue resolution.
• Implemented backup and disaster recovery solutions with regular verifications and recovery
drills ensuring data integrity.

Company industry:
Civil Engineering
Job role:
Information Technology

Education

Anna University

January 2014

January 2014

Bachelor's degree, Electronics and Communication Engineering

India

Skills

IT Operations

Expert

Intrusion Detection

Expert

Information Security

Expert

Teamwork

Expert

TCP/IP

Expert

INCIDENT RESPONSE

Intermediate

SUPERVISORY CONTROL AND DATA ACQUISITION (SCADA)

Expert

information security

Expert

SOAR

Expert

Security Assessment

Expert

EDR/XDR

Expert

TCP/IP

Expert

SIEM splunk,Azure Sentinal, RSA netwitness

Expert

endpoint security

Expert

SOC operations

Expert

itil

Expert

IT support

Expert

team management

Expert

Server Admin

Expert

Preparing SOC Reports

Expert

IT operations

Expert

Network Administration

Expert

windows server

Expert

Threat Detection

Expert

WSA,IPS,IDS,

Intermediate

firewalls

Intermediate

cyber security

Expert

web application security

Expert

system administration

Expert

risk management

Expert

computer hardware troubleshooting

Expert

Threat Hunt

Expert

Incident playbook

Expert

vulnerability assessment

Expert

COMPONENT DESIGN

Intermediate

COMPUTER AIDED ENGINEERING CAE

Intermediate

COMPUTER NETWORKS

Intermediate

DATA CENTERS

Intermediate

IT SECURITY ARCHITECTURE

Intermediate

LEADERSHIP

Intermediate

NETWORK MANAGEMENT

Intermediate

OPERATIONS

Intermediate

SOFTWARE DEPLOYMENT

Intermediate

BUSINESS OBJECTIVES

Intermediate

CLOUD COMPUTING

Intermediate

INFORMATION AND COMMUNICATIONS TECHNOLOGY

Intermediate

PROBLEM SOLVING

Intermediate

PROCESS IMPROVEMENT

Intermediate

PROJECT RISK MANAGEMENT

Intermediate

SOLUTION ARCHITECTURE

Intermediate

TEAM LEADERSHIP

Intermediate

VENDOR MANAGEMENT

Intermediate

ADAPTABILITY

Intermediate

INCIDENT MANAGEMENT

Intermediate

INVESTIGATION

Intermediate

SERVICE LEVEL MANAGEMENT

Intermediate

AGILE PROJECT MANAGEMENT

Intermediate

BUSINESS DEVELOPMENT

Intermediate

COMPUTER SYSTEMS

Intermediate

EMBEDDED SYSTEMS

Intermediate

INFRASTRUCTURE ARCHITECTURE

Intermediate

MARKETING

Intermediate

MECHANICAL ELECTRICAL AND PLUMBING MEP SYSTEMS

Intermediate

OPERATIONS MANAGEMENT

Intermediate

SECURITY SYSTEMS

Intermediate

CHANGE MANAGEMENT

Intermediate

CISCO CERTIFIED NETWORK PROFESSIONAL

Intermediate

FORTINET CERTIFIED NETWORK SECURITY PROFESSIONAL

Intermediate

IT INFRASTRUCTURE

Intermediate

NETWORK ACCESS CONTROL

Intermediate

SERVICE MANAGEMENT

Intermediate

SYSTEMS ENGINEERING

Intermediate

TELECOMMUNICATIONS ENGINEERING

Intermediate

WAN

Expert

MPLS/BGP/OSPF

Expert

Languages

English

Expert

Arabic

Beginner

Training and Certifications

Certifications
CISSP (Certified Information system Security Professional)
SISE (Cisco Identity Services Engine) — Network Access Control and Policy Enforcement
NSE 4 (Fortinet Network Security Expert)
CCNP Routing & Switching (R&S) & Wireless
ITIL— IT Service Management, Change Management, Incident Management
CompTIA S+
Certified Ethical Hacker
CISSP
Fortinet NSE 4
ITIL
Cisco SISE
CCNP Wireless
CCNP Enterprise
CISSP
CompTIA S+
Certified Ethical Hacker
CISSP
Fortinet NSE 4
ITIL
Cisco SISE
CCNP Wireless
CCNP Enterprise
NSE
fortinet
CCNP
CEH
CCNA
ITIL

Training
IEC 62443
Networkhome