Senior back-end developer (remote)

A Branch of American Marketing company is looking for Senior Back-End Developer.

Requirements:
Knowledge of PHP 5 (at least 3 years of development experience);
Experience with MySQL, MongoDB, MariaDB, Doctrine (at least 3 of them are mandatory);
Knowledge of the following frameworks: jQuery, AngularJS, Backbone.js, Ext JS (1 is a must)
Proven experience with Node.js;
Basic skills in CSS/HTML;
Knowledge of a version control system (GIT);
Understanding of SSH, SSL, XML, FTP, SFTP, DRY and other similar concepts;
Ability to participate in project definitions;
Experience with relational database modeling;
Understanding of main web-site secure vulnerabilities and being able to provide security audits and implementation of fixes;
Understanding of Agile principles;
Experience with performance optimization of databases, stress tests;
Ability to be independent, creative and attentive to details;
Ability to take ownership and drive projects;
Very good English writing skills and verbal communication skills.

Will be a plus:
Knowledge of either Drupal 7, Joomla or WordPress;
Previous experience with OOP and MVC frameworks (Codeigniter, for example);
Prior experience with Salesforce / Hubspot or any other CRM;
Basic server knowledge based on Linux.

Responsibilities:
Performing maintenance programming for existing high performing web applications build on Node.JS framework and/or on presentation websites/LP's;
Providing and adhering to time estimates for the amount of time required to repair a defect, a build, or to add additional functionality to an existing application;
Providing efficient solutions in a timely manner for work requests, issues, and defects;
Exploring new software development technologies and techniques independently;
Documenting code and reporting on project deliverables;
Developing landing pages and microsites as side projects for marketing campaigns;
Debugging and finding solutions to problems that might appear on the spot;
Working independently on multiple small tasks as well as larger builds with shifting priorities and tight deadlines;
Performing custom programming upon request;