- Node.js with Express - Amazon AWS: EC2, Lambda, S3, DynamoDB, Aurora - Serverless architecture - IDEs and Tools: CentOS, Ubuntu/Debian, OSX. Vagrant, Docker, Nginx, Apache, SBT, Maven, Gradle, Git, IntelliJ IDEA, Jenkins, Jetty, Tomcat - APIs: Facebook, Twitter, Livejournal, VK, JIRA, Mailchimp, Mailgun, Mandrill, Zendesk, Twilio, socket.io (ngx-socket.io) - Testing: Mocha, Jest - Database: PostgreSQL, MongoDB, MySQL, SQLite - Cloud Services: Amazon Web Services, Digital Ocean, Heroku, Firebase - PostgreSQL & PostGIS database - Tomcat application server - DMS Alfresco - Java environment