Scaling on-call par Damien Pacaud Scaling your on-call team is crucial for most of the fast-growing startups that operate at a global level. The internet never sleeps, and even with the best design for resilience, one day, your system will go down. At teads, we deliver advertising for the biggest content publishers in the world. Any downtime has important repercussions on our revenue but also on the publisher’s revenue. We decided to carefully think about scaling our on-call team in order to minimize the downtime when a system goes down. This is the story of how and why we scaled our on-call team. We’ll start by discussing our early days on-duty strategy, move on to the failed iterations that we tried and end the talk with our current working strategy.