David Dilley

Senior Systems Engineer with 15+ years of experience administering Linux and Unix server environments (Red Hat Enterprise Linux, Oracle Enterprise Linux, Ubuntu, SUSE, and AIX) across Azure and Oracle Cloud Infrastructure (OCI) and GCP. Proven track record in patch management and repo administration (Red Hat Satellite, Ansible Tower, Automox), backup and disaster recovery planning, and SOX security compliance, including audit preparation, access reviews, and change control documentation. Skilled at root-cause troubleshooting of complex hardware and software issues, Bash scripting for automation, and mentoring administrators while partnering with vendors and cross-functional teams.

Senior System Engineer - Chipotle Mexican Grill

(2023-05 - 2026-06)

• Administered Azure cloud infrastructure supporting Edge Servers (remote/branch-location servers) running Ubuntu 24.04 and RHEL 9, maintaining high availability across hybrid on-premises (VMware) and cloud environments (Azure).
• Increased security compliance and reduced vulnerability by 50%.
• Configured SSSD to connect and authenticate users using AD. Integrated AD groups into sudo access for administrators.
• Provided support for global datacenters in the UK, EU, and US.
• Completed POC for OS patching tool called Automox, a cloud-native OS patch management platform, to automate and enforce patch compliance across the Linux server fleet, strengthening security posture and audit readiness. Patch CVE vulnerabilities.
• Engineered and maintained Spectro Cloud (Kubernetes lifecycle management) deployments, including building custom OS install images and repo-based server builds for containerized restaurant applications nationwide.
• Managed hybrid VM environments spanning on-premises hardware running VMware and Azure Virtual Machines, standardizing provisioning, and configuration consistency across distributed infrastructure.
• Supported mission-critical Chipotle Kitchen application infrastructure at the edge, troubleshooting and resolving system issues to restore operations with minimal downtime.

Senior Unix/AIX/Linux Administrator - Big Lots

(2012-05 - 2023-05)

• Reduced provisioning time from 1 day to 15 minutes using Red Hat Satellite.
• Served as primary administrator for Red Hat Satellite and Ansible Tower, managing repo servers, patching, provisioning, and configuration management across the Linux fleet.
• Provided 99% uptime objective to large SAP environment running AIX using Oracle RAC.
• Configured SSSD on Red Hat servers to authenticate users via AD (LDAP). Integrated AD user groups into sudo access.
• Implemented One Identity (Dell QAS) Active Directory integration for the Unix environment, including global sudo-based privilege escalation, improving access control and security compliance.
• Managed PeopleSoft running on AIX. Supported Manhattan Warehouse management system (WMS).
• Supported the SOX compliance program for the Unix/Linux server environment, including audit preparation, access reviews, and change control documentation for a publicly traded retail enterprise.
• Administered a multi-platform Linux/Unix environment — Red Hat Enterprise Linux 7, 8, and 9. Oracle Enterprise Linux 7, SUSE Linux SLES 15 (via SUSE Manager), and AIX 7.1/7.2 on PowerVM — supporting retail POS systems, including server builds and OS patch/update cycles.
• Migrated production website infrastructure from Rackspace RHEL servers to Oracle Cloud Infrastructure (OCI) running Oracle Enterprise Linux 7. Supported OEL servers running on OCI cloud.
• Supported, created, configured, and maintained CUPS printing on on-prem Linux servers.
• Built and supported Mirantis Docker container clusters on RHEL 8, partnering with the development team to support containerized applications.
• Managed backup, snapshot, and disaster recovery operations, including SAN administration (IBM SVC/DS, EMC VMAX/VNX, 3PAR) and HACMP 7.1.1 clustering for data warehouse environments.
• Administered Linux virtual machines hosted in Rackspace and AWS cloud environments.
• Created administrative scripts in Bash, Python, and KSH.

Senior Systems Engineer - Abercrombie & Fitch

(2008-10 - 2012-05)

• Provided 99% uptime objective for 600+ servers (AIX, SUSE, Red Hat, and Oracle Enterprise Linux) in a large, virtualized infrastructure.
• Implemented Manhattan Warehouse Management production environment.
• Built and patched AIX, Red Hat, and Oracle Enterprise Linux servers.
• Installed and configured SUSE Linux 11 running on VMware ESX clients for the e-commerce platform, including Veritas Cluster Server for database failover.
• Led OS build standards and disaster recovery planning across the Linux and AIX server environments, partnering with SAN, network, and vendor teams to meet project requirements.

Bachelor of Science in Business Administration - Management Information Systems (Computer Science + Business Management) - The Ohio State University