design sprint-like event in which computer programmers and others involved in software development, including graphic designers, interface designers, project managers, and others, often including subject-matter-experts, collaborate intensively on software projects with the goal to create usable software

NOTE 1 to entry Also known as a hack day, hackfest or codefest.

NOTE 2 to entry Hackathons tend to have a specific focus, which can include the programming language used, the operating system, an application, an API, or the subject and the demographic group of the programmers.