System Administrator Vulnerability Management

AKSHAY JUNEJA

Faridabad, Haryana, India *************@*****.*** 999-***-****

SUMMARY

Linux & DevOps Administrator with 6+ years’ experience in managing, automating, and optimising on-premises and cloud infrastructures. Expert in Linux administration, AWS, Ansible, Docker, Jenkins, and Git, with a track record of enhancing performance, security, and scalability for mission- critical critical systems.

SKILLS

Operating Systems: RHEL, CentOS, Ubuntu

Cloud & Virtualisation: AWS, VMware ESXi, PXE Boot, Dell iDRAC CI/CD & Version Control: Jenkins, Git

Automation & Scripting: Ansible, Bash

Monitoring & Performance: Prometheus, Grafana, Nagios Networking & Security: DNS, DHCP, Firewall Configurations, Vulnerability Management, System Hardening (CIS) Containers & Orchestration: Docker and Kubernetes

EXPERIENCE

Senior Linux System Administrator

Mathisys Quantcap September 2024 - August 2025, Gurugram

• Optimized ultra-low-latency Linux systems for high-frequency trading, reducing latency and improving execution speeds.

• Automated configuration and deployments using Ansible for 100+ bare-metal and virtual servers, ensuring zero configuration drift.

• Managed PXE boot infrastructure to accelerate server provisioning for trading workloads.

• Deployed and managed containerized applications using Kubernetes, including cluster setup, pod management, and service orchestration.

• Collaborated with trading and development teams to troubleshoot latency-sensitive applications.

• Fine-tuned RHEL-based systems with standard/special access permissions and sudo configuration. Global System Integration Engineer

Cognyte Analytics August 2022 - February 2024, Gurugram

• Performed OS hardening, patch management, and kernel tuning to ensure system stability and security.

• Implemented security best practices, including firewall management and regular patching. This resulted in a 40% reduction in security incidents. Designed and deployed a secure, scalable three-tier AWS architecture with EC2, RDS, and Elastic Load Balancer integrated with Route 53, ensuring high availability and fault tolerance.

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• Developed Ansible playbooks for provisioning, configuration management, and application deployment.

• Collaborated with DevOps teams to integrate infrastructure with CI/CD pipelines (Jenkins + Git).

• Mentored junior sysadmins and led patching/maintenance windows across multiple environments. Linux Administrator

Karix Mobile October 2021 - August 2022, New Delhi

• Managed and supported 500+ Linux servers using virtualization technologies.

• Managed Windows Server 2016–2022 and Active Directory (users, groups, OUs, GPOs).

• Implemented and managed DNS, DHCP, and Certificate Authority (CA) services.

• Handled SSL certificate installation and renewal across enterprise systems.

• Performed server patching, updates, performance monitoring, and security hardening. Linux Administrator

CMS Computers September 2019 - July 2021, New Delhi

• Applied CIS benchmarks for system hardening and vulnerability management.

• Configured firewalls and performed regular patch management to reduce security incidents.

• Used Docker and Red Hat virtualization to deploy and manage Linux environments.

• Implemented software upgrades, patches and fixes on servers, workstations and network hardware.

• Installed, configured, and maintained MySQL databases, including performance tuning, backups, and security hardening. EDUCATION

MBA in Information Technology

Symbiosis International University • Pune, India • 2020 • A+ Relevant coursework: Cloud Computing, E-Business, IT Management, Software Engineering, Database Management, Software Quality, Data Warehousing, and Data Mining.

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Bachelor of Commerce

University of Delhi • Delhi, India • 2017

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