Linux System Administrator with 8 years of experience in systems administration, networking, and support.
Provide Linux system administration support for US Navy’s DevSecOps pipeline, including software updates, server maintenance, new application deployment, and RHEL OpenShift support.
• Reduced downtime by configuring automated monitoring of SSL certificate expiration using Zabbix and Grafana.
• Enhanced server provisioning speed by automating mandatory software installations and system configurations through Ansible playbooks.
• Managed AWS EC2 instances, configuring security groups, and IAM roles with appropriate permissions and ports.
• Improved security of RHEL servers by performing SCAP scans and applying the appropriate STIG rules and remediating vulnerabilities.
Supported Windows 10 environment configuration using Microsoft Endpoint Configuration Manager (SCCM/MECM). Validate new hardware for driver compatibility with DoD, Navy and NIWC Pacific requirements. Create driver packages for integration with SCCM and the baseline image. Automate the configuration of machine BIOS and UEFI settings and integrate into the imaging process.
• Integrated 10 new hardware models with SCCM, creating driver packages with each and ensuring driver compatibility across the network.
• Created and maintained SOPs for common tasks, such as integrating a new .wim with MECM, and extracting drivers from new hardware models.
Provided network support, installation, and troubleshooting for the Network Integration and Engineering Facility (NIEF) on the Consolidated Afloat Networks and Enterprise Services (CANES) network. Configured and maintained Cisco routers, switches and WAPs. Utilized VMware vCSA to create, administer, and monitor Windows and Linux servers.
• Provisioned and configured RHEL 7 servers, including setting up internal repositories, updates, user and file permissions, and network configurations.
• Configured vulnerability scans using ACAS, including setting credentials and accounts for Windows and RHEL.
• Employed SCCM to create baseline images with required Windows updates and applications.
Designed and executed test cases for applications in support of the U.S. Army Human Resources Command. Analyzed and broke down functional and business requirements into different modules to make efficient test cycles. Planned and strategized test scheduling and estimations according to project scope and delivery deadlines.
• Executed 386 test cases during which more than 56 defects were found, including a critical PII vulnerability.
• Created 20+ test cases to test various functions of web-based application.
Coordinated a team of five to set up and maintain secure, satellite-based network services to a small sized organization. Performed periodic maintenance on Cisco routers and switches. Assisted vendors with upgrades and service arrangements for computer systems on terminal networks. Performed maintanence on TACLANEs such as updating network information, and refreshing security keys.
David Marquez — david.an.marquez@gmail.com — (619) - 403-2796