Since its inception, GitHub has seen tremendous growth as the go-to place for programmers to share their code and solict contributions from others on their projects.
In fact, it's not uncommon for a tech job opening in Silicon Valley to require the applicant to include their GitHub profile with their resume (or even instead of a resume) so the hiring manager can see their skills in action.
GitHub's business model largely hinges on subscriber-based premium versions for businesses, so people on the public Internet can't see the code you're working on internally. It's not quite standard in the programming workplace - Atlassian BitBucket, among others compete with GitHub in this space - but it's quite popular and growing.
Of course, it's not all sunshine for GitHub: Co-founder Tom Preston-Werner left GitHub under a dark cloud last year after he and his wife were accussed of harassment and gender-based discrimination. GitHub cleared Preston-Werner of any wrongdoing after an internal investigation, however.
The company also has a pretty unusual culture, with a management system that doesn't have strict titles and hierarchies - programmers can work on whatever they want - and it built a replica of the Oval Office in its headquarters after its first funding round in 2012, when it raised $100 million led by Andreessen Horowitz. This round is also rumored to be led by the same firm.
A spokesperson for GitHub did not reply to a request for comment at the time of publication.
Disclosure: Marc Andreessen, co-founder of Andreessen Horowitz, is an investor in Business Insider.