Used For

• +**Waiting 20 minutes for CI tests then forgetting to click merge** → Bot merges automatically when tests pass and reviewers approve
• +**Multiple developers trying to merge at once, creating conflicts** → Merge queue handles one PR at a time in the right order
• +**Bug fixes need to go to 3 different release branches** → Automatic backports handle the tedious git cherry-pick dance
• +**Inconsistent merge policies across 12 repositories** → Write rules once, apply everywhere
• +Serial merge queue prevents the "oops, someone else merged first" race condition

Best For

• >Your team merges 10+ pull requests daily and someone's always waiting around to click merge
• >You're tired of the "merge this after that, wait what was the order again?" chaos
• >Engineering manager wants consistent merge rules across repos without trusting humans to remember them

Not For

• -Solo developers or tiny teams under 5 people — you're not merging enough PRs to justify the setup overhead
• -Teams that merge less than 5 PRs per week — manual clicking is faster than writing YAML rules
• -Companies requiring complex approval workflows that can't be expressed in simple if/then rules

Pairs With

• *GitHub Actions (runs your tests that Mergify waits for before merging)
• *Jenkins (another CI system that reports build status back to GitHub for merge decisions)
• *Slack (where you get notifications about successful merges and queue status)
• *Linear (your task tracker that gets updated when feature branches auto-merge)
• *Datadog (monitors your deployment pipeline after Mergify ships code to production)
• *PagerDuty (alerts you when the merge queue gets stuck or CI keeps failing)

The Catch

• !You need to understand your team's branching strategy and CI setup to write effective rules — not just "merge when green"
• !Flaky CI tests become flaky automation — if your tests randomly fail, so will your merges
• !Cloud-only SaaS model means no self-hosting if your company has strict security requirements

Bottom Line

Turns your GitHub merge button into a vending machine — drop in the right coins (approvals, passing tests) and code gets merged automatically.