In 2000, Butterfield worked with Jason Classon to build a startup called Gradfinder.com. Following Gradfinder.com's acquisition, he worked as a freelance web designer. Butterfield also created a contest called the 5K competition, centered on people with the ability to design websites under 5 kilobytes. Tiny Speck launched its first project, the massively multiplayer game
Glitch, on September 27, 2011.
Glitch was later closed due to its failure to attract a sufficiently large audience. The game world closed down on December 9, 2012, but the website remained online. In January 2013, the company announced that it would make the most of the game's art available under a
Creative Commons license. On December 9, 2014, a fan project to relaunch Glitch under the name Eleven began
alpha testing.
Slack In August 2013, Butterfield announced the release of
Slack, an
instant-message-based team communication tool, built by Tiny Speck while working on
Glitch. After its public release in February 2014, the tool grew at a weekly rate of 5 to 10 percent, with more than 120,000 daily users registered in the first week of August. In early 2014, the data for Slack's first six-month usage period showed that nearly 16,000 users were registered without any advertising. That same year, Butterfield secured an office for Slack employees in San Francisco, and was expected to commence recruitment during the second half of the year. Slack was named Inc. Magazine’s 2015 company of the year. In June 2019, the company announced its
initial public offering with an opening price of $38.50 and a market capitalization of US$21.4 billion. In December 2020,
Salesforce confirmed plans to buy
Slack Technologies for US$27.7 billion. In December 2022, Butterfield announced his departure as CEO of Slack and left Salesforce early in January 2023. ==Awards and honors==