Linux Systems Administration - HPC - AWS - Virtualization - Containers - Configuration Management - Scripting - Security - Documentation - IT-Infrastructure - Internet - Networking
Red Hat Certified System Administrator (RHCSA)
Continuously improve systems performance, security and availability.
LAMP stack expertise.
Extensive documentation abilities.
Architect, deploy & administer hardware and software systems, with expertise in HPC environments.
Proven ability to lead and manage a wide variety of systems deployment projects in team and independent situations.
Development, integration, validation, and benchmarking of HPC prototype clusters, as well as technical documentation and collaterals.
Physical build-up and commissioning, software builds for systems and application environments, cluster administration and operation.
Member of the technical staff in charge of supporting multiple client HPC facilities. Cluster management, troubleshooting and supervision using tools such as Bright Cluster Manager, xCAT, schedulers such as Slurm, PBS, and monitoring tools such as Nagios, Ganglia, Zabbix. Introductory setup and usage of AWS HPC provisioning environments such as SOCA.
Performed deployments and configuration of system and application software on HPC cluster systems across several clients facilities.
Member of the infrastructure staff in charge of supporting a high availability Linux-based e-commerce platform, with extensive in-house development.
Multiple LAMP systems (both intranet and internet-facing), CMS, back-office, VoIP telephony, and warehouse operations.
Main responsible for an extensive structured documentation initiative using Atlassian Confluence. Coadministered Atlassian systems such as Bitbucket, Jira, and Confluence, and e-mail systems such as Zimbra and Mailarchiva.
Configuration management using SaltStack. Supervision and monitoring using checkmk.
Continuous vulnerability assessment and remediation (Rapid7/InsightVM), and systems hardening.
Administrative usage of VMware platform for a 200+ VM Linux farm, including VM lifecycle operations, and interaction with MS Windows Server components and 400+ end point stations.
Familiar with methodologies of the Agile workflow, EOS, SCRUM, and DevOps infrastructure support.
Supporting role in a new technologies project for critical application migration to AWS, including Docker, Kubernetes.
Responsible for the management of the Parasol Laboratory research
infrastructure. Support for internal and external research collaborators
and external dissemination of research products; ensuring quality of
service of the computing platform.
System administration for high-performance parallel and heterogeneous systems, including a Cray XE6m Supercomputer (NetApp storage), GPU/CUDA HPC servers (Supermicro, IBM), Dell servers supporting KVM and VMware virtualization, Rocks clusters, and 100+ Linux VMs and workstations (130+ internal and remote users), and their customization for the laboratory's research projects.
Red Hat Enterprise Linux, CentOS, Cray/SUSE, and Fedora platforms, including commissioning, OS and application migrations, backups and security.
Identity, inventory, change and configuration management; hardware and software integration, web mastering (3 major websites, various intranet servers), MySQL and PostgreSQL database servers, contents management server, revision control, and overall system administration, ensuring compliance with the State of Texas IT regulations.
Extensive documentation abilities supporting administrative collaborators and end users.
Assist in the organization of research meetings, sponsored project review meetings, and site visits that include internal and external participants.
Internship as Master student.
Second level help desk for a 8000+ students campus, Active Directory programming. Data center system deployment, server security analyst, virtualization prototyping and testing.
While following a full time MSc program at the PVAMU, taking care of diverse assignments and projects supporting the Computer Science Department research and administrative activities. ABET documentation, LAMP software development.
Managed company technology aspects including overview and administration of the Linux server infrastructure, in close coordination with the CEO and CTO offices. Supervised a software development team for company growth initiatives, including deployment and support of SaaS CRM, CMS, e-mail, e-commerce and messaging solutions, custom development, and infrastructure issues. Red Hat Enterprise Linux and MySQL Integrator.
Responsible for critical network relocation including data center, analog voice, VoIP, and internet services at Tocumen Airport in Panama. Coordinated work schedule through airport officials and multiple vendors for timely service continuity. Completed airport's infrastructure assessment towards LAN/WLAN, VoiP, PA and CCTV overhaul.
Participated in the first and successful deployment of more than 200 JDS (Java Desktop/SUSE)
workstations, at the time the largest such project in the country, delivered by Orion as partner
of Sun Microsystems.
Developed plan to migrate from Windows platform. Provided solution to compatibility issues.
Supervised development, training of system administrators, and deployment teams.
Developed the company's Information Office as a critical business support unit, in permanent
collaboration with the CEO and department leaders. Architected the company’s computing and
networking infrastructure, including early adoption of Internet technologies and web presence.
Performed system administration, software development and deployment, and responded for all data
processing needs utilizing MS Windows Server, UNIX, and LINUX based servers.
Led the successful deployment of commercial ERP, CRM and POS systems in the company.
Team leader in charge of an electronics servicing laboratory for nation-wide telecommunications infrastructure. Hardware and firmware upgrades, and quality assurance. Designed database applications and format converters to manage the operations and exchange information with the main office in Germany. Participated in field operations in Venezuela.
David Ramirez — — (979) 422-3918