Ernesto Eduardo M.
System Administrator

Guadalajara, MEXICO

11+ years experience

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Licenses & Certifications

Licenses & Certifications

ITIL Foundation Certificate in IT Service Management
The Chartered Institute for IT

WebSphere Application Server Network Deployment v7

AWS Certified Cloud Practitioner
Amazon Web Services

Linux Professional Institute - LPIC-1


IBM Certified Database Associate - DB2 9 Fundamentals


IBM Certified eBusiness Developer


IBM Certified Linux System Administrator


October 2008 - March 2009

Java Application Developer

I wrote a "document control and administration system for ISO-9000 files" using Servlets, Applets, DB2 and shell scripting.


April 2009 - October 2010

Linux Instructor

Linux instructor:
-2 LPIC-1 training courses with groups greater than 20 students.

Linux support:
-Netware to Linux migrations
-Samba PDC with LDAP backend.

Web hosting and web development:
-Using LAMP, sendmail and vsftpd.


December 2010 - November 2012

zLinux System Administrator

I was a contractor for IBM Global Business Services - DST WWOperations Mexico http://dst.ibm.com
zLinux virtualization and cloning over z9 and z10 mainframes using z/VM 5.4
AIX, SuSe and Red Hat server and security administration.
IBM Middleware support to WAS, IHS, DB2, MQ, LB/ND, GSA.


November 2012 - August 2013

z/VM System Operator

IBM Global Business Services - DST WWOperations Mexico http://dst.ibm.com
zLinux ( SLES10-11 ) provisioning using z/VM 5.4-6.2 on z9 and z10 mainframes.
zSeries tools: HMC, DirMaint, RACF, LXC, XEDIT, REXX.
L2 support of WebSphere Application Server (WAS) Network Deployment and IBM HTTP Server (IHS)
L1 support to DB2, MQ, LoadBalancer (LB), GSA and AIX.


August 2013 - September 2016

Middleware Administrator

I'm a contractor for Broadcom, I worked 3 weeks on Irvine CA, and now I'm doing HomeOffice from Mexico. My activities are:

1) Oracle Agile Product Lifecycle Management (PLM) Deployments using: JDK, Eclipse IDE, Subversion (SVN), Tomcat 6, Weblogic 10 and Oracle Database 11g on Red Hat Linux and Windows Server 2008 R2.
Nowadays the Subversion repository is replaced by Team Fundation Framework (TFS), the deployments process is automated using Maven, TFS Builds and CA Release Automation software.

2) Support to Legacy Unix applications on LAMP stack using: RHEL 4, Apache 2.0, MySQL 4.1 and Perl 5.8. This activities include perl scripting, SQL DML statements and new environments setups to integrate Legacy applications with SAP.

3) Support to IAM project: IBM Access Manager and IBM Identity Manager.

4) Installation of the WebCRD product in QA and Prod environments from Rochester Software
Associates (RSA).

5) Installation and configuration and support of custom PHP apps for the Broadcom's Engineering department running on Nginx with PHP-FPM, MySQL and MongoDB, doing deployments using Jenkins, monitoring using Monit and SVN as source code repository.


June 2016 - February 2019

Infra Technology Engineer

I Support Amdoc's WebLogic Enterprise apps for our customer AT&T in USA including prod (24x7) and non prod environments.
Also starting 2018 we started the migration of some enterprise apps onto the micro services platform hosted in AT&T's private cloud.

CI/CD Responsibilities:
On call support rotation for prod to cover weekends and evenings.
Deployments of new versions of the apps.
Providing RCA and troubleshooting prod issues.
SSL Cert renewal.
Automation using bash scripts and Jenkins pipelines.
I developed a Spring Boot app which consumes WebLogic RESTful services for sanity and monitoring purposes: https://github.com/ernestomedina17/SanityDashboard_WL

My Responsibilities:
Work with AT&T to provision new environments and test new architectures.
Troubleshooting app issues, environemnts and connectivity problems and provide RCA.
Enable developers and testers to access the platform.
I contribute with the documentation on the Wiki project page.
Request DNS Aliases.
Participate in scrum meetings, pass and receive the hand off to the offshore team in India.

CI/CD Technology Stacks of the JavaEE Apps : WebLogic App Server 12c, Oracle DB 11g, Solr, ZooKeeper. JDK v7 & v8, Apache http server, Red Hat v6.9.  
Auxiliary tools: Splunk, AT&T's SWM, Amdoc's AMC and XPI, Beyond Compare, Introscope, jstack, jmap, JKS keytool, Eclipse Memory Analizer.
Development tools: vim, Notepad++, Eclipse Spring Tool Suite, Spring Boot, jQuery, javascript, json, Rest, CSS, XHTML, Groovy, Java, Bash, Ksh, Perl, Jython, SqlDeveloper, Amdoc's XDK.
DevOps & CI/CD tools: Jenkins, Maven, SVN, Git, AT&T's SWM package management system, Ant, Amdoc's AMC (Tomcat, Oracle DB, Perl), Nexus.
Configuration Tools: Amdocs System Configurator, XML.
ITIL Systems: iTrack(JIRA), WebTrax, AOTS(Remedy), Sharepoint, Wikis.

My Technology Stack: Kubernetes, Docker, Git, Jenkins, Ansible, Ingress Proxy, Prometheus, Kibana, AT&T's MechID (ssh subset to avoid direct logins).

Ernesto Medina Corp.

July 2016 - August 2016

Independent Freelancer

Linux Storage config
Installation of RedHat 6 on 3 physical servers, 2 of them as prod cluster to host an Oracle DB and one as  DR. I did the setup of 4 LUNs using EMC-VNX.
I did the Linux network setup in the servers, and setup iscsiadm to access the iSCSI Luns and setup multipathd for the Network card redundancy.
Also tuned the Oracle ASM config file to pickup the multipath disks.
Ping me if you need some Linux consulting.

Keller Williams Realty, Inc.

February 2019 - November 2019

Senior Linux System Engineer

I'm providing Linux and cloud support services to KW as an independent Contractor using the 1099 form, working from home in Mexico.

- Manage SpaceWalk and develop an update strategy for the CentOS systems in the company across all the dev, qa and prod envs.

- Collect web metrics and generate graph reports using gnuplot.


IT Infrastructure
Ansible, Docker, Linux, Nginx, VMware, CentOS, Git, Postfix, Sendmail, Squid, Unix, Windows Server 2008 R2
Application servers
Apache, WebSphere Application Server, Zookeeper
Open Source solutions
Kubernetes, Monit
Analysis methods and tools
Microservices, Agile
Python, Shell Scripting, Bash, CSS, Groovy, HTML, Java, Java EE, JavaScript, Perl, PHP, SQL, XHTML, XML
Amazon Web Services, Applets, AWS, JVM, Servlets, SharePoint, Solr, Spring Boot, Tomcat, WebLogic
Consulting, Elipse, Kibana, Nexus, Prometheus, Splunk, Wikis
DB2, MongoDB, MySQL
Environment of Development
Eclipse IDE, JDK, Maven, SVN, WLST
REST, Spring MVC


AnsibleDockerLinuxNginxVMwareApacheKubernetesMicroservicesPythonShell Scripting

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