In the early days of intercom, there wasn't a shared or common approach to things like runbooks or even what a good alarm looks like. So teams were largely left to their own devices and they would kind of see what was working elsewhere. And so we built an operations team that was great for getting up to speed on scaling and resilience. But then when we built out additional services for new features,. our teams were no more productive or in fact less productive with these services. That's interesting. We'll get into all the specific challenges that you guys discovered as you guys grew and scaled. I don't think it was centrally kind of governed too much.
In this deep-dive episode, Brian Scanlan, Principal Systems Engineer at Intercom, describes how the company’s on-call process works. He explains how the process started and key changes they’ve made over the years, including a new volunteer model, changes to compensation, and more.
Discussion points:
- (1:28) How on-call started at Intercom
- (10:11) Brian’s background and interest in being on-call
- (14:06) Getting engineers motivated to be on-call
- (16:37) Challenges Intercom saw with on-call as it grew
- (19:53) Having too many people on-call
- (23:20) Having alarms that aren’t useful
- (26:03) Recognizing uneven workload with compensation
- (27:22) Initiating changes to the on-call process
- (30:08) Creating a volunteer model
- (33:02) Addressing concerns that volunteers wouldn’t take action on alarms
- (34:40) Equitability in a volunteer model
- (36:36) Expectations of expertise for being on-call
- (40:56) How volunteers sign up
- (44:15) The Incident Commander role
- (46:19) Using code review for changes to alarms
- (50:02) On-call compensation
- (52:50) Other approaches to compensating on-call
- (55:08) Whether other companies should compensate on-call
- (57:32) How Intercom’s on-call process compares to other companies
- (1:00:46) Recent changes to the on-call process
- (1:04:13) Balancing responsiveness and burnout
- (1:07:12) Signals for evaluating the on-call process
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