HackerOne powers the world’s leading bug bounty and vulnerability coordination platform. More than 600 organisations trust HackerOne to find their critical software vulnerabilities before criminals can exploit them. HackerOne has the world's largest community of trustworthy hackers to help improve your organisation's defense. Customers include General Motors, Adobe, Uber, the U.S. Pentagon, Salesforce, Twitter, Yahoo!, Dropbox, Square, LinkedIn, Snapchat, Airbnb, New Relic and the CERT Coordination Center.
HackerOne is kept running primarily by Ruby, PostgreSQL, Amazon Web Services, Ansible, Terraform and Packer.
I've been using Atom for a while now, and I'm really impressed with the progress that it's showing. There are still some times that I'm forced to switch back to Sublime (mass-editing a large text file for instance), but I'm really enjoying the experience!