Sr Developer & Analyst

Marcos L. Ortíz Valmaseda

Software Engineer (Unix/Linux platforms)

Name: Marcos L. Ortíz Valmaseda

Current Role: Infrastructure Engineer && IT Consultant at PDVSA,

Caracas, Venezuela

Nationality: Cuba

Languages: Spanish (native), English (fluent)

Email: **************@*****.***

Birth: 21/01/1986

Marital status: Single

Twitter: @marcosluis2186

Linkedin's Profile: http://www.linkedin.com/in/marcosluis2186

GitHub's Profile: http://github.com/marcosluis2186

Blog: http://marcosluis2186.posterous.com

Blog (Spanish): http://uncubanitolinuxero.blogspot.com

Mobile: +58-041********

Education

University of Information Sciences (La Habana, Cuba), 2004-2009

Bachelors in Informatics Engineering

Objective

To play a role in the architecture and design of large-scaled systems,

especially in complex or otherwise challenging applications

Working Experience

04/2011 - Present: Infrastructure Engineer && IT Consultant

PDVSA, Caracas, Venezuela

Responsible for the design, implementation and deploying of a

completed system based on RedMine for Project Management

Working the Operations’s Team like Infrastructure Engineer for

Ruby on Rails applications (Varnish-Cache, Nginx, Passenger,

PostgreSQL-9.0, VsFTPd, Pentaho BI Suite, Puppet)

Prepared the completed system using CentOS 6 and Debian 6

appliances.

Wrote the completed security policy using SELinux and Iptables for

all services on CentOS

11/2009 - 04/2011: Network System Engineer,

Universidad de las Ciencias Informáticas, La Habana, Cuba

Responsible for all servers and services of the center including:

BIND/DNS, ftp(Vsftpd), OpenLDAP, NFS, Samba, Apache, Nginx,

Lighttpd, Memcached, Heartbeat, Oracle

Responsible for the installation and configuration for a large

PostgreSQL Cluster (PgPool-II, PL/Proxy) for development and testing

purpose

Responsible for the installation and administration of a large

number of Memcached servers for image serving and database

queries results caching

Built a online image's compression and serving system using Bash,

ImageMagick, VsFTPd, Nginx and Memcached

Designed and implemented a large Load Balancing Cluster for

Apache Servers for serving a high traffic site for a local government on

CentOS-5.4 and Red Hat EL 5.4 (Heartbeat, LVS(ldirectord, Ipvsadm))

Designed the completed architecture of the Hadoop cluster of the

organization (more than 50 nodes) using automated configuration

tools (Puppet)

Participated on the design and implementation of the

in- frastructure's migration to a virtualized environment

using Vmware Tools(ESX, vCenter, etc)

Designed and improve the services architecture from a old Red Hat

4 systems to Red Hat 5.4 and 5.5 (planning to Red Hat 6)

Migrated all services based on Debian servers to CentOS 5.5

Migrated and helped to 85% of the workstations on

the organization from Windows to Linux systems (Fedora

and Ubuntu)

Managed and gave all training on Advanced

PostgreSQL Databases Administration, Services Administration in

Linux systems on the organization

Migrated and deployed all Databases Servers to a secure

enviroment based on the SELinux Mandatory Access Control system

Migrated all main web sites hosting services (Nginx,

Apache HTTPD and Tomcat) to a secure enviroment using SELinux

Developed and wrote the completed SELinux policy for PgPool- II

and PostgreSQL services (planning to migrate to SE-PostgreSQL)

Lead the tuning and optimization for all servers and services (O.S

kernel, File System tuning, I/O, etc)

Installed and managed the completed monitoring system for the

organization using Nagios and Munin

09/2009 - Present

Jr. Data Scientist: Centro de Gestión de Datos (DATEC),

Universidad de las Ciencias Informáticas, La Habana, Cuba

Responsible for all aspects of the PostgreSQL databases of the

center like tuning, optimization, stored procedures, views, schema

design

Designed and wrote the basic architecture for Hadoop/MapReduce's

use for Data WareHouses appliances (Hadoop + Hive)

Technologies

Programming Languages:

Python

Java

SQL

C/C++

Bash

JavaScript

Ruby

Erlang

HTML/CSS

Disco Project

http://discoproject.org

A pure Python's MapReduce implementation by Nokia Research Used for

massive WeServers log processing and Data Maining Applications

Django

django-balancer

django-haystack

django-messages

virtualenv

django-pygments

django-extensions

django-debug-toolbar

Enterprise Caching

Memcached

Hadoop ecosystem

Hive

Flume

Oozie

Zookeeper

HBase

Sqoop

NoSQL

A big fan of MongoDB

PostgreSQL

PgPool-II, PgBouncer, PL/Proxy, Bucardo, Slony- I, Skytools, PL/R, tablelog,

PostgreSQL Contrib Modules, PostGIS, Ora2Pg, orafce Advanced

Administration and Optimization, PL/pgSQL Development

SCM

Git and Subversion

Services

Bind, Apache 2, Nginx, Vsftpd, OpenLDAP, RabbitMQ, Heartbeat, Samba,

NFS, SAN,

Lighttpd, Varnish-Cache, Apache Traffic Server, and many others

Unix/Linux Systems

Linux: Fedora, Red Hat EL, CentOS, Debian/Ubuntu, OpenSUSE/SUSE EL

BSD:

FreeBSD: Used for services deployments

OpenBSD: Used mainly for Firewalls implementations using pf

Solaris/OpenSolaris:

Used for PostgreSQL, Oracle and MySQL installations and deployments on

Containers/Zones for its amazing ZFS

Virtualization

Vmware (ESX/vCenter/ Vmware Server), KVM , Solaris/OpenSolaris

(Containers/Zones)

SELinux

Used for the secure deployments of services on Linux systems (mostly

Red Hat and CentOS)

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