Yasat Zaman
Senior Linux System Engineer
New York,NY
Summary
A passionate Linux Systems Engineer with over 10 years of experience, holding a Public Trust clearance and a proven track record in analyzing, troubleshooting, maintaining, security hardening, migrating, and deploying systems and networks across diverse and heterogeneous environments. Dedicated, thorough, and responsible, consistently delivering solutions as a team player in mission-critical 24x7 settings. A pragmatic information technology professional who prioritizes a customer-centric approach and collaborates effectively to deliver IT services. Known for exceeding end-users' expectations by recommending and adopting new technological capabilities and processes to enhance their experience, contributing to the achievement of organizational strategic goals and objectives. Current focus is on leveraging extensive experience and strong interpersonal skills, with a commitment to continuous learning and growth as a Systems Engineer. Detail-oriented in improving system design and operations for reliable workflow management, while researching and implementing budget-conscious security and encryption solutions to protect user privacy and increase overall network health. Skilled in creating easy-to-follow guidelines and troubleshooting documentation for non-technical staff.
Overview
11
11
years of professional experience
4
4
years of post-secondary education
Work History
Sr. Linux System Engineer
Leidos
Baltimore , MD
5 2021 - Current
- Experienced in quickly identifying, assessing, and resolving incidents on Linux systems, adept with incident management tools to streamline response and enhance system resilience
- Maintaining computer systems, ensuring security, performing software upgrades, and overseeing system administration for 600+ servers running on RHEL
- Proficient in shell scripting, Ansible automation, Git for version control, and CIS Security Remediations
- Crafting Ansible playbooks for web apps, user management, config files, service orchestration, mounts, and package admin, with handlers and variables
- Contributed to automation efforts by aiding in Ansible inventory file configuration and deploying keyless SSH access within the environment
- Performed multi-node software deployment, ad hoc task execution and configuration management using Ansible
- Collaborated with development teams to facilitate CI/CD pipelines and application deployment on OpenShift infrastructure
- Managed Red Hat Satellite Network server, handling package management tasks and implementing errata updates
- Extensive experience in RHEL hardening and security measures
- Configure RHEL 7, 8 and 9 servers to adhere to the STIG benchmark using Oscap and Ansible playbooks
- Experienced in testing, validating, and documenting changes made during STIG implementation
- Enhanced server security by adjusting or eliminating various commands, services, SELinux settings, SSH daemon configurations, and GRUB configurations
- Managed Active Directory and used PAM for authentication, ensuring secure access to systems
- Skilled in deploying SSSD for RHEL systems to manage user authentication and access control through Active Directory
- Experienced in deploying file access policies with fapolicyd and adept at fine-tuning configurations to meet security and compliance needs
- RPM Package administration using RPM Build, installing packages, restore corrupted RPM database
- Performing patching, upgrades, and security support with extensive troubleshooting of OS and application issues
- Performed installation, configuration, access management, and file system management
- Configured PXE boot server and Kickstart file to automate Linux VM Deployment
- Administered VMware virtual machines, including creating VMs from templates, and aiding in application troubleshooting
- Skilled in system administration tasks: user management, volume configuration, filesystem creation, service setup, firewall configuration, and health monitoring
- Extensive experience in disk provisioning, configuration, and management, including LVM implementation to support ASM disk groups
- Proficient in managing bare metal infrastructure, handling RAID configurations, BIOS settings, and hardware monitoring
- Skilled in implementing and troubleshooting CIFS and Samba shares for seamless file access and collaboration on RHEL systems
- Capable of integrating Linux and AIX systems into heterogeneous environments, implementing seamless connectivity and interoperability across platforms
- Experience with Cisco UCS Manager, including conducting hardware firmware upgrades
- Skilled in diagnosing and resolving mail delivery, SMTP configuration, and DNS resolution issues
- Worked with cross-functional teams to execute DR drills and mitigate risks effectively.
Linux System Administrator
Refinitiv
Bridgewater , NJ
2018.10 - 2021.05
- Created users, manage user permissions, maintain User & File System Quota on Red Hat Linux
- Installed packages using YUM and Red hat Package Manager (RPM) on various servers
- Configured NFS shares and mounted on multiple systems using Ansible playbooks
- Participate in Vulnerability Management by writing Ansible playbooks to patch systems
- Pulled docker images and files from private docker registry and deployed docker containers
- Created/Setup LVM and NFS mounts on over 100+ virtual machines
- Used Logical Volume Manager (LVM) for the management of Volumes including creation of physical and logical volumes on Linux
- Linux administrator for RHEL systems (system resources: disk space, memory, CPU load)
- Experience in computer system maintenance, systems security, software upgrades and network administration of servers running RHEL (5.x, 6.x, 7.x, 8.x) and Windows 2016
- 24x7 Technical support and troubleshooting of over 1000 servers
- Performance Monitoring of CPU, Memory, Disk utilization, and network using various monitoring tools like Nagios XI
- Experience in troubleshooting issues with applications, networks, hardware etc
- Providing support to technicians on Network Configuration, Performance Tuning, Security Hardening (Iptables, Selinux)
- Performed Linux administration and data migration activities
- Worked on VM ESXi host (5.5, 6.5) and bare metal machines
- Operated exclusively on VMware virtual environment
- Responsible for independent support of Tier 2 and 3 issues: reboots, start/stop services, reset Terminal Service, and administrative server maintenance
- Troubleshoot issues related to user login, adding machines to domains and applying domain group
- Configure and schedule Cron Jobs to grab system metrics
- Monitor System analytics using Nagios
- Prepared the Documentation for Installation & Configuration of OS servers
- Installation, Configuration and maintenance of DNS, DHCP, FTP, NFS, and web servers (Apache)
- Perform Upgrades to operating systems and applications with minimal downtime
- Also perform RCA and implement rollback plans in case of system failure
- Configure containerized environments to make resources readily available for micro processes
- Proficient Linux System Administrator with hands-on experience in AIX administration
- Familiar with AIX-specific tools and utilities for system monitoring, performance tuning, and troubleshooting
- Able to provide comprehensive support for both Linux and AIX systems, including user management, filesystem administration, and backup solution
- Manage docker containers, starting, stopping, killing, running, and port mapping
- Handle tickets and incidents on EC2 instances
- Provision EC2 instances and configure their cloud environment (IAM, VPC, S3, CloudWatch)
- Deployed subnets and VPCs through AWS console
- Created S3 buckets for storing system log data
- Perform remote administration of production, QA, test, dev, and DR servers
- Documented various regular administrative tasks and backup procedures.
Linux System Administrator
L'Oréal
Jersey City , New Jersey
2014.02 - 2018.10
- Installation & Configuration of RHEL, Fedora Linux, and CentOS
- Performed daily maintenance & system administration for Linux Infrastructure
- Management of User accounts, System security, kernel performance monitoring and tuning
- Planned, documented, reviewed, and maintained system administration guidelines and policies
- Performed multi-node software deployment, ad-hoc command execution, and configuration management using Ansible
- Managing package install/upgrades using YUM and RPM
- Performed data migration across multiple UNIX/Linux servers, and Windows Servers
- Worked on VMware vSphere and dealt with ESX, ESXi bare metal servers
- Created and deployed Shell scripts to automate daily repetitive activities
- Regularly participated in meetings for Hardware and software evaluation, recommendation, and vendor management
- Installation, configuration, and maintenance of web servers, application servers, and database servers with Linux
- Configured NFS as well as user accounts/groups for NFS directories
- Performed transferring files from one system to other using FTP, SFTP, Winscp, and scp
- Performed Installation/upgrade, system startup, and system shutdown as needed
- Created bash scripts to ping server nodes and add users to remote machines
- Resolved system errors and crashes, disk space problems, huge file sizes, and file system errors
- Backed up and restored files across networks and wrote technical documentation for various projects and system performance
- Perform call Rotation responsibilities for Production environment
- Configured LDAP Server and LDAP Client on Linux machines for authorization and authentication
- Manager which involved creating and modifying file systems, logical volume, Physical volume, Volume groups, mirroring and un-mirroring of volume groups, physical volume
- Performed hardware and software installations, upgrades, and maintenance, patch administration, kernel modification/upgrades, performance and security analysis, and network configuration/tuning
- Maintained security on all Linux systems for regulatory compliance
- Administer operating systems, hardware, and peripheral components
- Perform software installation, upgrades/patches, troubleshooting, and maintenance on Linux servers
- Participate in root-cause analysis of recurring issues, system backup, and security setup
- Involved in installation and configuration of various third-party software onto servers.
Education
Bachelor of Science - Information Technology
Queens College, City University of New York
Flushing, NY 2014.09 - 2018.05
Skills
Monitoring tools
Backup solutions
Automation tools
API Integration
Performance Tuning
Disaster Recovery
Configuration Management
Bash Scripting
Backup and recovery
Patch management
Security Protocols
Scripting Languages
Security management
Code Development
Network Security
Cloud Services
Linux
Linux Server Management
Technicaloverview
RHEL/CentOS Linux (5,6,7,8), Suse-Linux (12), Windows (7,8,10), DNS, DHCP, LDAP, TCP/IP, UDP, VLAN, HP ProLiant DL380 G7, Dell PowerEdge (R610, R710), Bash Shell Scripting, YAML, Python, SSH, FTP, TFTP, Apache, Samba, NIS, NFS, SAN, Nagios, Tenable Nessus, Datadog, Nagios, Xymon, Grafana, Kibana, Prometheus, BMC Remedy, Jira, Service Now, Git (GitLab, GitHub), Salesforce, Ansible, Docker, AWS (EC2, S3, CloudWatch, IAM, VPC), PXE Boot, MySQL, PostgreSQL, SQLite, LVM, RAID (0, 1, 5, 6, 1+0), Microsoft Office Suite, Adobe Acrobat, putty, Slack, Skype, TeamViewer, VPN
References
References will be provided upon request.
Timeline
Linux System Administrator
Refinitiv
2018.10 - 2021.05
Bachelor of Science - Information Technology
Queens College, City University of New York
2014.09 - 2018.05
Linux System Administrator
L'Oréal
2014.02 - 2018.10
Sr. Linux System Engineer
Leidos
5 2021 - Current
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