Exploring Linux, security, and privacy

Isaac Velando


I am a Linux engineer with interests in security, performance optimization, and automation. I enjoy experimenting with new technologies to expand my knowledge and improve my capabilities, and I strive to be a quick learner and both a competent leader and capable worker.


M.S. Applied Mathematics
Sept. 2010 – Jun. 2011
Northwestern University, Evanston, IL

B.S. Applied Mathematics/Minor: Statistics
Aug. 2006 – May 2010
Texas A&M University, College Station, TX


I have been a Linux enthusiast since early 2010 and have been running servers, scripting, and experimenting with new software. Most of the code I write is in Bash, Python, PHP, and MySQL. Additionally I have experience in large-scale mathematical simulations on clusters using MATLAB, Python, and Bash scripts.

Relevant Online Activity

LinuxQuestions.org (search by User Name: “Isaac Velando”)

Selected Experience

HandHeldPage, Houston, TX

Technical Lead, WhyiLike – Jun. 2013 to Present

  • Linux System Administrator (Bash, sed, awk, cron, Regex etc)
    • Select, set up, configure, and manage Ubuntu and CentOS web servers, database servers, and computation servers
    • Configure SSL certs; performance- and security-tune Apache, MySQL, and OpenSSH services
    • Improve security, automate maintenance, and ensure reliability
  • Automation Engineer (Bash, Python, PHP, Regex)
    • Write database-aware scripts to automate product operations including payments, notifications, invitations, rewards, and analytics
    • Built an automated email-based system to send FCC-compliant SMS messages on behalf of a client
    • Automate image creation, processing, and optimization using ImageMagick
  • Web Developer (HTML5, CSS3, PHP, MySQL, Regex)
    • Develop and maintain a multi-user web application to facilitate product operations
    • Created custom interfaces for CRM and client dashboards
    • Developed a secure signup form with an automated payment and onboarding system
    • Write plugins for a WordPress site

Northwestern University, Evanston, IL

Ph.D. Student Researcher – Jun. 2011 to Jun. 2013

  • Primary Research
    • Studied epidemics from a network science perspective
    • Developed large-scale mathematical simulations in MATLAB, Python, and Bash to run on a Sun Grid Engine cluster
    • Managed a MySQL server for storing and accessing large datasets
    • Contributed batch processing articles to research group wiki
  • Previous Research
    • Improved mathematical models for laser and fiber optic systems
    • Investigated rare events using simulations in MATLAB and Python

Truman College, Chicago, IL

Adjunct Professor – Jan. 2013 – May 2013

  • Developed full set of original course materials in LaTeX and presented and administered them to a college algebra class
  • Addressed an audience of students with highly diverse and varied backgrounds



  • vim
  • Bash — including sed & awk
  • Regular Expressions
  • Python
  • PHP
  • Cron

Linux Distributions

  • Debian, Ubuntu, and various derivatives
  • RHEL, CentOS
  • Arch

Server Software

  • Apache
  • MySQL
  • OpenSSH
  • rsyncd
  • iptables

VPS Providers

  • Amazon EC2
  • Rackspace Cloud Servers