Fastmail

At Fastmail, we’re bringing the human touch back to email. We have three email services, Fastmail email, Topicbox email lists, and Pobox emailing forwarding. On the backend we use Debian, Bash, Perl, Apache, Consul, Cyrus, MySQL, Nginx, Postfix, Prometheus, and of course many other things. We host everything ourselves in physical datacenters. Much of our software is open source, including our Javascript framework - see https://github.com/fastmail/. We're heavily involved in the construction and maintenance of open standards, and of course you'll be working a lot with the JMAP protocol in most of these roles!