On-call rotation patterns

A rotation is an ordered list of people, a shift length, and a handover time. A schedule can stack several rotations as layers. Most schedules are built from a handful of patterns.

Weekly rotation

Each person holds the pager for a full week. They hand over to the next person in line at the scheduled time.

• Fits: most teams with four or more people and a moderate number of pages.
• Watch for: a bad week is exhausting. Some teams give the person coming off a heavy week a lighter next day.
• Handover time: pick a working-hours time, such as Monday 10:00, so the handover can be a conversation. Midnight handovers mean nobody talks.

With four people, each person is on call one week in four. With fewer than four, on-call comes round so often that people burn out. If the team is that size, reduce what pages out of hours before adding more rota.

Daily rotation

Each person covers one day or one night, then hands over.

• Fits: teams that page often, so no one person carries a whole week.
• Watch for: seven handovers a week, each a chance for context to be lost.

Weekday and weekend split

A weekday rotation covers Monday to Friday. A separate weekend rotation covers Saturday and Sunday. This spreads the least popular shifts. Some teams pay or give time off for the weekend shift separately.

Business hours and after hours

One rotation covers working hours, when people are at their desks. Another covers nights. The working-hours rotation can include everyone. The after-hours rotation can be smaller and volunteers only. Pair this with low-urgency alerts that only notify during working hours.

Primary and secondary

Two rotations run at once, offset by one position. This week's secondary was last week's primary or will be next week's. The primary is paged first. The secondary is the next escalation level and a person to call for help.

• Fits: services where a missed page is expensive, or where new people are joining the rota and want a backup.
• Watch for: the secondary is also on call. Count it when you count how often people carry the pager.

Follow the sun

Teams in several time zones each cover their own working hours. The pager passes from region to region through the day. For example, a team in Europe covers 08:00-16:00 UTC and a team in the US covers 16:00-00:00 UTC. This pattern continues around the clock.

• Fits: organisations with engineers in two or three regions spread far enough apart.
• Watch for: gaps and overlaps where the regions' working days do not quite meet. Daylight saving changes move the handover for one region and not the other. The escalation level after the in-hours region usually wakes someone in another region. Keep this level for urgent alerts.

Overrides and swaps

People get ill and go on holiday. An override puts someone else on call for part of a shift without changing the rotation. Good tools make overrides easy, show them on the schedule and notify both people. Without overrides, people edit the rotation itself and break the order for everyone after them.

Making on-call sustainable

The pattern matters less than what happens on shift. A few habits that hold up across teams:

• Count pages, not just shifts. Review how many times each person was paged, and how many of those were at night.
• Protect the day after a bad night. If someone was up at 03:00, they should not be expected at a 09:00 meeting.
• Hand over in writing. A short note: what fired, what is still open, what might fire again.
• Fix the noisy alerts first. Every alert that did not need a human is a candidate for deletion. See alert fatigue.
• Agree on compensation before the rota starts. Paid on-call, time off in lieu or both. Local employment law may also set rules on working time and rest.

Choosing a pattern

Pick the rotation that matches your team size, page volume, and geography. The table below shows sensible defaults for common situations.

Team situation	Start with
One team, one time zone, few pages	Weekly rotation
One team, many pages	Daily rotation, or primary and secondary
People new to on-call	Primary and secondary, new people as primary with an experienced secondary
Engineers in two or more distant regions	Follow the sun
Night pages are rare and should stay that way	Business hours and after hours, with low urgency at night

Tools that build these schedules are in the on-call directory.