Nov
06
Going Public – Part One
On April 26th, 2019, Slack filed to take the company public. We’d managed to overcome the most painful growing
11 min read
Latest Posts
Oct
16
You asked: What is the the right way to use Slack?
Hello friends,
First off, thanks for all the questions you sent in for our interview with Cal. It was so
6 min read
Sep
20
An Interview with Cal Henderson
Our interview with Slack's co-founder and CTO, Cal Henderson. Recorded Sept 19th, 2025.
60 min read
Aug
18
The reliability crisis
“If we can’t ship safely, we aren’t shipping at all,” Cal Henderson wrote in our #announce-devel channel.
It
13 min read
Aug
01
Turning Slack into a network
One of the four big bets in Stewart’s Master Plan was to make Slack a network.
We initially designed
10 min read
Jun
23
Eric
Eric Costello co-founded four products at two companies with Stewart, Cal and Serguei. Ludicorp made Game Neverending and Flickr. Tiny
7 min read
Apr
14
The 800-pound gorilla
On the morning of November 2nd, 2016 we arrived to the office to find a paper copy of the New
11 min read
Mar
24
Lost in the grid
Ali Rayl knew Slack’s customers better than anyone. As Slack’s first customer support staff, Ali personally answered every
9 min read
Feb
24
The Master Plan
Backstage, Stewart vibrated with his typical charismatic energy. An assistant checked his lapel mic. Everyone in the company, now numbering
4 min read
Jan
30
Values
We did many things fairly well at Slack. One thing we never did well, however, was figuring out how much
8 min read