Jonathan's bookshelf

Find here an odd assortment of thoughts I put online.
Jonathan Villemaire-Krajden
Chemin du Crêt-de-la-Neige 5,
1234 Vessy, GE
Nationality: Canadian
Bilingual, English and French


I am a software developer with a focus on software architecture. I design APIs, and write modular and principled software. I have experience with infrastructure and deployment. I collaborated with security specialists to mitigate risks and harden software and servers.


2018 -
System Specialist
EPFL (HBP) 〉European Flagship research project coordination office
  • Provide implementation and code reviews (Python, Java).
  • Design system architecture (Jupyter, KeyCloak, Seafile, OpenID).
  • Implement Jupyterhub on Kubernetes with cloud storage (Openshift).
  • Infrastructure maintenance in research cloud (Ansible, Gitlab).
We simplified the project's collaborative platform by combining open source technologies. I designed and implemented Jupyterhub on Kubernetes with a shared cloud storage based on Seafile.
2016 - 2017
Site Reliability Engineer
Digital Foodie 〉SaaS grocery e-commerce and logistics platform provider
  • Designed and implemented microservices for order processing and pricing(REST).
  • Infrastructure design, set-up and maintenance on AWS (Kubernetes, Docker and Jenkins).
  • Provided code reviews and implementation (Ruby, PostgreSQL).
I collaborated on the redesign of the services architecture. This work will reduces maintenance and increases performance. I improved database queries to significantly reduce background processing time during indexing.
2015 - 2016
Web Developer 〉Immigration law firm
  • Implemented libraries and site features (PHP, Python).
  • Led IT team to use development best practices (git, Jira).
  • Migrated websites and infrastructure (CentOS, PHP, MySQL).
I migrated the site to a new redundant architecture leading to better uptime and safer deployments. I helped with the migration towards the adoption of best practices, bringing accountability to projects.
2012 - 2015
Research assistant and system administrator
Concordia University CLaC 〉Computational linguistics research lab
  • Managed desktops, servers, filers, compute nodes (Ansible, Debian).
  • Did research in natural language processing (GATE, NLTK).
2012 - 2013
Web Developer
PALM+HAVAS 〉Global advertising company
  • Built back end for Volkswagen Canada customer loyalty site (Kohana).
  • Provided maintenance on agency's customers' websites.
I designed and developed the back end of a customer loyalty site, thus building a flexible CMS that provided highly customizable layouts.
2010 - 2011
Web Developer
Evolving Web Inc. 〉Web development agency
  • Developed back end modules for websites (Drupal).
  • Deployed high-availability infrastructure (Linux-HA, GlusterFS).
  • Built cloud infrastructure and monitoring (AWS, Chef, Nagios).
I implemented features to allow the company to fulfill customer requirements. I set up a scalable redundant cloud infrastructure that reduced downtime and increased performance.


2006 - 2010
McGill University
Bachelor of Science
Joint Major of Physics and Computer Science
2004 - 2006
Champlain College
DEC in Science
International Baccalaureate in Science
2012 - 2013
Concordia University
Graduate coursework
  • Compiler Design
  • Natural Language Analysis
  • Statistical Natural Language Processing
  • Semantic Web

Technical Skills

Python, Java, C/C++, Javascript, SQL, Bash, Ruby, PHP
Kubernetes, Docker, Ansible, Chef, Jenkins, Gitlab-CI, Nagios
JupyterHub, Tornado, Django, Pyramid, Sinatra, Kohana, Drupal
Linux (CentOS, Debian, Fedora, Ubuntu, Archlinux)
LAMP stack, iptables, NGINX, PostgreSQL, MySQL
Git, Mercurial, SVN, CVS


Find out more about my projects on GitHub: