Calin S.

Devops engineer

Cluj-Napoca, ROMANIA
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Mon expérience

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Provider of Data Storage and Management Solutions01.08.2016 - Présent

Full-Stack Developer / DevOps Engineer.
  • Feature implementation in a web application built on a Spring Boot back-end, with an Angular 1.5 front-end.
  • Development of algorithms to improve the multiple entity searching process in a SQL database tree table.
  • Creation of operators for indexing UUIDs in MySQL and PostgreSQL databases.
  • Implementation of a continuous improvement and continuous deployment workflow using a configuration management tool (Ansible).
  • Simulation of data centers using containers (Docker, LXC) for a better application performance visibility.
  • Development of API services using RESTful endpoints for the migration tool, in order to easily manage its commands.
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Freelance01.01.2016 - Présent

DevOps Engineer within various projects requiring to keep functional the infrastructure of some web applications.
  • Implementation of high availability and load balancing strategies.
  • Installation and configuration of the host OS on servers (CentOS, Debian, NixOS, FreeBSD).
  • Using virtualization tools (KVM, OpenVZ, Docker, LXC).
  • Provisioning infrastructure with Ansible or SaltStack.
  • Tuning a Linux kernel for a higher performance.
  • Configuration of web servers like Nginx, HAproxy, Hiawatha for multiple purposes (mainly static content servers, reverse proxy, load balancing) and caching using Varnish.
  • Configuration of monitoring tools like Prometheus, Graphana, Nagios or InfluxDB.
  • Configuration of Mikrotik routers, switches and APs.
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Pentalog01.03.2017 - 01.08.2017

DevOps Engineer within the Computer Systems and Software Department of the Pentalog group.
  • AWS Cloud automation deployments with Chef / Ansible and CI / CD tools (Jenkins) in Linux environments.
  • Script development for various automation tasks.
  • Installation, configuration and maintenance of Linux / Windows servers and application servers.
  • Managing (creating, maintaining, automating) the build and the deployment process for multiple projects and releases.
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Software Publisher01.10.2015 - 01.09.2016

  • Implementation of Ext JS components based on the client's requirements and their integration into a single page application.
  • Helping the team with the best solutions over problems that are not covered by the Ext JS framework or JavaScript engine of each web browser.
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SF AppWorks01.08.2013 - 01.09.2015

Full-Stack Developer within a company providing mobile application design and development solutions and services.
  • Development of web applications using Ruby on Rails, MongoDB.
  • Implementation of the communication with multiple APIs of third-party projects.
  • Implementation of the UI components for most of the projects based on provided design mock-ups.
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Jillix01.07.2013 - 01.08.2013

Developer within a company providing creative web solutions.
  • Development of web applications using Node.js and their in-house framework.
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RubyTribe01.06.2012 - 01.08.2012

Developer within a company whose activities are focused on providing IT product development solutions and services mainly for start-up companies.
  • Development of an invoicing web application for Cluj Cowork space (Ruby on Rails).
  • Contribution to the development of the Real Estate Money Matrix web application (Ruby on Rails).
  • Writing a web application for ExtraVerde building presentation (HTML, CSS, and a lot of jQuery animations).
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Projects01.01.1970 - Présent

Participation in multiple projects and competitions:
- 1st place winner at Fii Practic 2015 (April 2015 - May 2015).
  • Development of a web application using Drupal 7 and Flickr API.

- Participant at Google Code-In (November 2013 - January 2014).
  • Made video tutorials installing Drupal version 8.x on most web servers (Hiawatha, Nginx) or using NoSQL databases (MongoDB). All of them were made on Linux distributions.

- 1st place winner at IT_eam 2014, Educational app development (May 2014).
  • Development of a real-time web application using Meteor and MongoDB that helps teachers to see exam results for students in real-time.
- Mention at the Olympiad of Informatics, County session (March 2013).

- Member of, SaaS platform for building social learning environments (March 2013 - August 2013).
  • Responsible for back-end development and operations.
  • Modification of platform for the HDI Cancer Institute from Netherlands.
- Rivalary Tourism ( April 2013).
  • Development of a web application which helps tourists to find out information about visited attractions, by other users, in Romania (TripAdvisor clone). The application was based on CodeIgniter and Zurb Foundation 3.

- Participant at Google Code-In (December 2012 - January 2013).
  • Writing a time management application in PHP and JavaScript for Fedora Foundation.
- Participant at Google Code-In (December 2011 - January 2012)
  • Made video tutorials for Sahana Foundation (how to install developer tools, how to deploy to a production server, etc).

Mes compétences

Langues parlées

ENGLISH: Beginner
ROMANIAN: Native speaker

Networks and systems

Windows, Mac OS X, UNIX, GNU, Linux, Ansible, Chef, Debian, Docker, Docker Swarm, FreeBSD, Heroku, LXC, NixOS, Puppet, Salt, Slackware, Ubuntu, Windows Azure


JavaScript, Ruby, Python, C/C++, JAVA, TypeScript


Spring Boot

Web technologies

HTML5, CSS3, AngularJS, Ember JS, jQuery, Meteor.js, Node.js, Bootstrap, Foundation, Modernizr, Amazon Web Services, CodeIgniter, IBM Bluemix Service, RESTful API, Ruby on Rails


MongoDB, MySQL, PostgreSQL

Analysis methods and tools


Development Environment

Bazaar, GIT, Maven, Openshift, Vagrant

Application servers

Hiawatha, Nginx, Tomcat, Apache, Hiawatha, Nginx, Tomcat

Open Source solutions


Software testing



Graphana, Jenkins, Nexus, Packer, Prometheus

Mes études et formations

Bachelor's Degree in Computer Science, Faculty of Mathematics and Computer Science - "Babes-Bolyai" University, Cluj-Napoca.