https://refericon.pl/
As a Full Stack developer, I have worked for 2 years with Poland partner Refericon Sp. z o.o. , which is a great SaaS(Software as a service) dev team.
From here, I have learned and allowed the following backend and frontend skills:
- Laravel, Ruby on rails
- React, Vue, Node
- Firebase, MySQL, MongoDB
- Bootstrap, HTML5, CSS3, Jquery, Javascript