Backend: PHP 5.3+, Symfony2/Silex/Laravel, Doctrine.
Frontend: HTML, CSS, JavaScript, jQuery.
DB: MySQL, PostgreSQL.
Teamwork: Scrum, JIRA/Redmine/Trello, Git/Mercurial, Gerrit.
Other tools: PhpStorm, PHPUnit, Composer, Vagrant, bash, memcached, Redis, MongoDB, RabbitMQ, Jenkins-CI, PhantomJS.
API: Twitter, Facebook, MailChimp, Google Analytics, Twilio, VKontakte, RBK Money, Robokassa.