After Slack
- 13%Founded something8
- 18%Joined a startup11
- 15%Joined a big company9
- 54%Elsewhere
Shares of those who moved on, by their next stop.
People who leave Slack most often go to Meta, Apple and Stripe. 13% found something next. 18% go small. Median stay 2y 11m
These are the engineers in the Zelcast network and the profiles run through the Eng Scorer, not Slack's headcount: 90 people on a map of 26,572, the No. 111 company on it by people. Updated August 20, 2026.
- People on the map
- 900.3% of everyone on the map
- There now
- 2831% of the people here
- Moved on
- 6269% of the people here
- Median tenure
- 2y 11mmiddle half 1y 6m to 4y 10m
Put Slack side by side with another company, every number against every number.
Came from, went to
Ribbon width is the number of people who made the move. Most arrive from Google. Most leave for Meta (6% of recorded departures).
The Slack mafia
8 of the people who left went straight to a founding role, 13% of those who moved on, half of them the same month they left. The bars are the ’15 to ’26 classes; earlier founders count in the total.
How long people stay
15%<1y
19%1-2y
28%2-4y
32%4-7y
7%7y+
75 stays with both a start and an end on the record.
Who comes and goes, by year
0012
0013
2014
3115
12516
7617
10418
171019
181420
141621
151222
9723
2524
1225
0026
joined left2026 is a partial year
2012 to 2026: 110 joined, 82 left.
Caliber
84mediantop 10%93
0Eng Scorer caliber, 90 scored99
Titles held here
- Senior Software Engineer27
- Software Engineer Intern26
- Software Engineer19
- Staff Software Engineer9
- Associate Software Engineer8
- Engineering Manager7
- Software Engineer II5
- Senior Engineering Manager4
8 most common titles, by people who held them.
First job on the record for 6% of people here.
Behind the median
Everyone here with an Eng Scorer read, placed in their caliber tier.
- 6%Exceptional5 people
- 26%Strong23 people
- 49%Solid44 people
- 20%Emerging or unproven18 people
90 of the 90 people here carry an Eng Scorer tier.
Exceptional and strong are the top two of the five tiers. 28 of the 90 people here with a read sit in them, 31%. A tier is the band an Eng Scorer caliber score falls in, so this is the same measurement as the median on the caliber card, opened up. A tier holding fewer than 3 people is printed together with the one next to it, because a bucket that small is a person rather than a pattern.
Whether a title rose here
The level of the first title recorded here, against the last.
46%Titles that rose32 of 70 classified people
- 46%Rose32 people
- 50%Stayed level35 people
- 4%Fell3 people
70 of the 90 people here had a title that could be placed on the ladder before and after.
A title rose when the last title recorded here sits higher on the ladder than the first; for someone who recorded one title here and then left, it is measured against the first title of their next role. The ladder runs intern, junior, mid, senior, staff or manager, principal, director, VP, then founder or C-level. A title that matches no rung is left out rather than guessed, and product, program and project managers are left out entirely, being a different ladder. That leaves 70 of the 90 people here classified, and it leans towards people who have left: someone still here on a single recorded title has nothing to be measured against.
Where they studied
- UC Berkeley15.9%
- Carnegie Mellon6.8%
- Stanford5.7%
- UNC Chapel Hill5.7%
- Georgia Tech4.6%
- University of Michigan4.6%
- Columbia3.4%
- Penn3.4%
The 8 most listed schools among the 88 people here with a school on file.
Of the 88 people here with a school on file, 14 list UC Berkeley, 6 list Carnegie Mellon and 5 list Stanford. A person can list more than one school, so these overlap rather than add up.
Public work
one square is one in a hundred
56%have a public GitHub account on their profile
50 of the 90 people here whose profile was checked for public accounts. An account the check did not find reads the same as no account, so this is a floor rather than a census.
Across the 325 companies on the map that can show this figure, the median is 38%.
Where they are now
73% of the people who have worked at Slack and list a location live in the San Francisco Bay Area today, against 47% of everyone on the map.
Slack
Everyone on the map
- 73%SF Bay Area66 · map 47%
- 24%New York22 · map 33%
All 90 people who worked at Slack list a location, and every share here is over them.
Where they live now, from the profile as it reads today, not where they sat while they worked at Slack: a metro here does not mean the company has an office in it. The lower strip is the same metros across the whole map, for comparison.
On the same resumes
Companies that show up most often alongside Slack, at any point in a career.
Key facts
- 90 people on the Zelcast alumni map have worked at Slack: 28 are there now and 62 have moved on.
- The most common next employer after Slack is Meta (4 people, 6% of recorded departures), followed by Apple and Stripe.
- The most common previous employer before Slack is Google (4 people), followed by Meta and Quip.
- The median tenure at Slack is 2y 11m (middle half 1y 6m to 4y 10m).
- Of those who moved on from Slack, 13% went on to a founder title, 18% joined a company with 200 or fewer people, and 15% joined a company with 10,000 or more.
- The median Eng Scorer caliber of people who have worked at Slack is 84 on the 0 to 99 scale (90 scored).
- The most common title held at Slack is Senior Software Engineer, then Software Engineer Intern.
- Of the 88 people here with a school on file, 14 list UC Berkeley (15.9%), then Carnegie Mellon (6). A person can list more than one school, so these overlap rather than add up.
- 73% of the 90 people here who list a location live in SF Bay Area today, against 47% of everyone on the map. That is where they live now, not the office they sat in while they worked here.
- 56% of the 90 people here whose profile was checked for public accounts have a public GitHub account on it.
- Of the 70 people here whose title could be placed on a ladder both before and after, 32 rose, 35 stayed level and 3 fell.
About this data: built from 144,786 jobs across 26,572 engineers in the Zelcast network and Eng Scorer reads, updated August 20, 2026. A move counts when the next role starts within 24 months of leaving; companies with fewer than 20 people on the map are not shown, and destinations with fewer than 3 people are folded into the totals. Caliber is the Eng Scorer score.
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