Serguei Mourachov
Co-Founder and former Principal Engineer of Slack
Data Confidence: 84% · Sources: 5 · Last Updated: Sep 18, 2026
- Net Worth ▲
- Estimated $50M – $250M
- Reach ▲
- 47.0M people
- Power ▲
- As co-founder and principal engineer of Slack, Mourachov architected the core real-time backend and message server infrastructure that powered daily operations for over 750,000 organizations before its $27.7 billion acquisition by Salesforce.
- Influence ▲
- His backend architectural decisions for Slack established real-time, persistent channel messaging as the global industry standard for enterprise collaboration.
- Network ▲
- Maintains deep technical connections across Silicon Valley and Canada through co-founders Stewart Butterfield, Cal Henderson, and Eric Costello, as well as alumni networks from Flickr, Slack, and Salesforce.
- Legacy ▲
- Co-created core technologies for Flickr and Slack, leaving an enduring imprint on workplace software and modern web application scaling.
- Trajectory ▲
- Stable — first assessment on record.
About
Serguei Mourachov is a software engineer and entrepreneur who co-founded the workplace messaging platform Slack alongside Stewart Butterfield, Cal Henderson, and Eric Costello. Before building Slack, Mourachov worked on early engineering teams for photo-sharing service Flickr and co-founded Tiny Speck to create the online game Glitch. As principal engineer at Slack, he designed and maintained the core real-time backend server infrastructure that sustained the platform's rapid growth. His technical contributions helped power Slack to over 47 million daily active users, culminating in its $27.7 billion acquisition by Salesforce in 2021.
Known For
Co-founding workplace communication platform Slack and architecting its core real-time backend infrastructure.
Connections
Leadership & Employment
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