After Slack
- 11%Founded something11
- 17%Joined a startup17
- 23%Joined a big company23
- 48%Elsewhere
Shares of those who moved on, by their next stop.
People who leave Slack most often go to Google, Apple and Meta. Of them, 11% found something next and 17% go somewhere small. The median tenure is 2y 10m
Not Slack's headcount: these are the engineers in the Zelcast network and the profiles run through the Eng Scorer. 151 people on a map of 67,181, No. 161 on it by people. Updated September 30, 2026.
- People on the map
- 1510.2% of everyone on the map
- There now
- 5134% of the people here
- Moved on
- 10066% of the people here
- Median tenure
- 2y 10mmiddle half 1y 6m to 4y 6m
Came from, went to
Ribbon width is the number of people who made the move. Most arrive from Google. Most leave for Google (7% of recorded departures).
The Slack mafia
11 of the people who left went straight to a founding role, 11% of those who moved on, half of them the same month they left. The bars cover the ’18 to ’26 classes; earlier founders still count in the total.
How long people stay
15%<1y
16%1-2y
31%2-4y
28%4-7y
9%7y+
137 stays with both a start and an end on the record.
Who comes and goes, by year
<3014
5<315
19616
13917
15718
241619
241820
222121
322122
161523
61024
3625
<3<326
joined left2026 is a partial year
2014 to 2026: 183 joined, 132 left.
Caliber
84mediantop 10%93
0Eng Scorer caliber, 101 scored99
there now 81 moved on 84. The people who left score higher than the people still there.
Titles held here
- Senior Software Engineer43
- Software Engineer Intern34
- Software Engineer29
- Staff Software Engineer23
- Associate Software Engineer11
- Software Engineer II9
- Engineering Manager8
- Software Engineer I6
8 most common titles, by people who held them.
First job on the record for 4% of people here.
Behind the median
Everyone here with an Eng Scorer read, placed in their caliber tier.
- 5%Exceptional5 people
- 24%Strong24 people
- 46%Solid46 people
- 22%Emerging22 people
- 4%Unproven4 people
101 of the 151 people here carry an Eng Scorer tier.
29 of the 101 people here with a read sit in exceptional or strong, the top two of the five tiers, 29%. A tier is the band a caliber score falls in, so this is the same measurement as the median on the caliber card, opened up.
Whether a title rose here
The level of the first title recorded here, against the last.
45%Titles that rose49 of 110 classified people
- 45%Rose49 people
- 47%Stayed level52 people
- 8%Fell9 people
110 of the 151 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 with one title here who then left, it's 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. Titles that match no rung are left out rather than guessed, and product, program and project managers are left out entirely as a different ladder. What's left leans towards people who have left: someone still here on one recorded title has nothing to measure against.
Where they studied
- UC Berkeley13.4%
- Georgia Tech8.1%
- Stanford6.7%
- Carnegie Mellon4.7%
- MIT3.4%
- UC San Diego3.4%
- UNC Chapel Hill3.4%
- University of Michigan3.4%
The 8 most listed schools among the 149 people here with a school on file.
20 of the 149 people here with a school on file list UC Berkeley, 12 list Georgia Tech and 10 list Stanford. A person can list more than one, so these overlap.
Public work
one square is one in a hundred
56%have a public GitHub account on their profile
84 of the 151 people here whose profile was checked for public accounts. An account the check missed reads the same as no account, so this is a floor.
31% is the median across the 857 companies that can show this figure.
Where they are now
64% of the people who have worked at Slack and list a location live in the San Francisco Bay Area today, against 41% of everyone on the map.
Slack
Everyone on the map
- 64%SF Bay Area97 · map 41%
- 23%New York35 · map 18%
- 3%Washington DC5 · map 13%
- 2%Denver3 · map 0.8%
- 2%Seattle3 · map 5%
- 5%Somewhere else8
All 151 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 working at Slack: a metro here isn't an office there. The lower strip is the same metros across the whole map.
On the same resumes
Companies that show up most often alongside Slack, at any point in a career.
Key facts
- 151 people on the Zelcast alumni map have worked at Slack: 51 are there now, 100 have moved on.
- Most leave for Google: 7 people, 7% of recorded departures. Then Apple and Meta.
- Most arrive from Google: 7 people. Then Meta and AWS.
- Median tenure at Slack: 2y 10m, middle half 1y 6m to 4y 6m.
- Of the people with a recorded next move after Slack, 11% went to a founder title next, 17% joined a company of 200 or fewer, and 23% joined one of 10,000 or more.
- Median Eng Scorer caliber here: 84 on the 0 to 99 scale, across 101 scored people.
- Most common title held here: Senior Software Engineer, then Software Engineer Intern.
- Top school: UC Berkeley, listed by 20 of the 149 people here with one on file (13.4%). Then Georgia Tech (12).
- 64% of the 151 people here who list a location live in SF Bay Area today, against 41% across the map. Where they live now, not the office they sat in while they worked here.
- 56% of the 151 people here whose profile was checked for public accounts have a public GitHub.
- 49 rose, 52 stayed level, 9 fell, out of the 110 people here whose title could be placed on a ladder before and after.
About this data: built from 352,028 jobs across 67,181 engineers in the Zelcast network and Eng Scorer reads, updated September 30, 2026. A move counts when the next role starts within 24 months of leaving. Companies under 20 people on the map aren't shown, and destinations under 3 people fold into the totals. Caliber is the Eng Scorer score.
Worked at Slack? See how your profile reads to a startup hiring manager, and where it ranks among 67,181 engineers.
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