Calin S.

Devops Engineer

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My experience


PentalogMarch 2017 - Present

DevOps Engineer working as part of a team of certified Solution Architects and Engineers in the Pentalog Customer DevOps service. Agile and Lean principles is the foundation of our DevOps methodology, which promotes the collaboration between business owners and development, operations, and quality assurance specialists. Altogether as a team, we ensure alignment on the goals and we focus on continuous improvement to achieve them.
  • 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.

Provider of Data Storage and Management SolutionsAugust 2016 - August 2019

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.

Software PublisherOctober 2015 - September 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.

- - FreelanceJanuary 2016 - August 2016

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.

SF AppWorksAugust 2013 - September 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.

JillixJuly 2013 - August 2013

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

RubyTribeJune 2012 - August 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).

My stack

Spoken languages

ENGLISH: Beginner
ROMANIAN: Native speaker

Software Testing


Environment of Development

Vagrant, Maven, GIT, Bazaar, Openshift

Networks and Systems

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

Open Source solutions



Nexus, Packer, Graphana, Prometheus, Jenkins

Web Technologies

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


PostgreSQL, MySQL, MongoDB

Analysis Methods and Tools


Application Servers

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


Spring Boot


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

My education and trainings

Master's Studies in Distributed Systems in Internet, Faculty of Mathematics and Computer Science - "Babes-Bolyai" University, Cluj-Napoca.2018 - 0

Bachelor's Degree in Computer Science, Faculty of Mathematics and Computer Science - "Babes-Bolyai" University, Cluj-Napoca.2015 - 2018

My tests

DevOps quiz medium level
DevOps quiz medium level
Python 3 quiz advanced level
Linux quiz advanced level