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).

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.