Unified Grid: How We Re-Architected Slack for Our Largest Customers

Slack's engineering blog describes how it rebuilt its client and backend so Enterprise Grid users see all their workspaces in one view, rather than switching between them. The team prototyped first, using it internally, then fixed thousands of APIs and permission checks. It reused existing integration tests under org context, where hundreds of suites initially failed, and capped relevant workspaces at 50 per user. Rollout ran from fall 2023 to March 2024. The performance and bug-reduction benefits are stated as expectations, not measured results.