Performance review season: how calibration actually works (from the manager side)

Review season starts at my company in two weeks, and every year I get the same questions from engineers: what actually happens in calibration? Who decides? Can I do anything about it? Here's an honest answer, based on the companies I've worked at. Details vary, but the shape is similar almost everywhere.

What calibration is

Managers write ratings for their reports. Then a group of managers sits in a room with a director, and the ratings get compared and adjusted so they're consistent across teams. Often there's a target distribution, written or unwritten, for how many people can get the top rating.

What actually happens in the room

1. Each manager presents their people. In a big session, you get roughly three minutes per person.
2. Other managers ask comparison questions: "Is she really above him? Their projects look similar."
3. Ratings move. Up sometimes, down more often, because of the distribution.

What gets people moved down

• Vague impact: "helped with the migration"
• No evidence from outside the team
• A manager who can't explain the work clearly in three minutes

What gets people moved up

• Numbers: latency, cost, incidents, revenue, hours saved
• Scope: "owned the migration end to end across three teams"
• Quotes from people on other teams
• The sentence "without them, this wouldn't have happened", backed by a specific example

What you can do

1. Keep a brag doc. Three bullets every Friday. What you shipped, what you unblocked, what you learned. It takes five minutes and writes half your self review.
2. Send your manager a one-page summary two weeks before submissions. Make it easy for them to argue for you.
3. Ask directly: "What would it take for me to be rated X next cycle?" Get the answer written down in your 1:1 doc.
4. Get visible outside your team. A design review, a postmortem write-up, a brown bag talk. The people in the room need to have heard your name before.

For quiet engineers, I write their packets with extra care, because they won't do it for themselves. But not every manager does that, and you shouldn't have to depend on it.

The person who isn't in the room is only as visible as their manager's notes. Make the notes easy to write.

Engineers: did anyone ever explain calibration to you before your first review? Managers: what do you wish your reports sent you before review season?