Slack Senior Software Developer reviews

4.0

74% would recommend to a friend

(50 total reviews)
avatar

Stewart Butterfield

57% approve of CEO

73% positive business outlook

Senior Software Developer employees have rated Slack with 4.0 out of 5 stars, based on 50 company reviews on Glassdoor. This indicates that most Senior Software Developer professionals have a good working experience there. Slack is rated in line with the average (within 1 standard deviation) by Senior Software Developer professionals compared to other employers within the Informationstechnologie industry (3.9 stars).

Reviews by job title

50 reviews
1.0
Oct 21, 2025
Recommend
CEO approval
Business Outlook

Pros

They give a lot of swag, work pace isn’t too hard, mid level people are generally nice

Cons

This company ruined my life and PIP’d me for taking time off to mourn. They took from me my passion for what I do and made me realize how quickly someone will throw you under a bus. Scheming managers. They did a soft layoff where they were forced to PIP a certain number of employees, I had never had a performance conversation or a negative comment and the manager fabricated evidence for a pip (including asking for advice, taking sick time when my dad died, and calling in a senior engineer during a high severity outage). I’ve personally spoken to multiple other engineers that had the exact same thing happen to them.

Viewing 4 - 6 of 50 Reviews

Glassdoor has 1,227 Slack reviews submitted anonymously by Slack employees. Read employee reviews and ratings on Glassdoor to decide if Slack is right for you.