What does pagerduty do and why does every engineering team seem to use it?

Head of Product

PagerDuty occupies a specific place in engineering infrastructure that becomes obvious the first time you're responsible for a system that has to run continuously and something goes wrong at 2 a.m. The product is an incident management platform. Its core job is to receive signals from monitoring systems — alerts that say something in your infrastructure is broken or degraded — and route those signals to the right person or team quickly enough to minimize downtime. The reason every engineering team seems to use it is that the alternatives — someone monitoring a dashboard manually, or alerts going to a shared email inbox that no one is watching overnight — break down as soon as systems are complex enough that things go wrong at unpredictable times. PagerDuty works by sitting between your monitoring tools and your people. You connect alerting systems — this might be Datadog, New Relic, CloudWatch, Prometheus, or dozens of other monitoring platforms — and configure rules about what kinds of alerts should trigger what kinds of responses. When an alert fires, PagerDuty creates an incident and notifies the on-call person through whatever combination of push notification, SMS, phone call, or email is configured. The escalating notification sequence is deliberate: if the first person doesn't acknowledge within a defined time window, the alert escalates to the next person or team. This escalation chain ensures that a critical incident doesn't silently sit unacknowledged because the primary on-call person missed a notification. The on-call scheduling system lets engineering teams define who is responsible for responding to incidents at any given hour, across days of the week and including holidays and time zones. Teams can set up rotations where responsibility cycles through team members on a weekly basis, so no single person carries the burden of being on-call indefinitely. Those schedules also handle override logic for vacations or days off. Beyond the notification and escalation layer, PagerDuty provides an incident response workflow. When an incident is created, responders can acknowledge it, add notes, create conference calls, notify stakeholders, and resolve it all within the platform, which creates a documented timeline of what happened and what was done. That documentation matters both for post-incident review and for compliance purposes in environments where audit trails of system incidents are required. The reason it's standard in engineering teams specifically is that the alternatives have well-known failure modes. Manual monitoring doesn't scale to systems that need to be watched continuously. Email-based alerting produces massive noise that people learn to ignore. Custom notification scripts are fragile and require maintenance. PagerDuty solves a specific, well-defined problem reliably enough that it became the default choice for teams that can't afford for incidents to go unnoticed. On most plans, the core incident notification and on-call scheduling features are available from the entry tier, though advanced features like event intelligence and automated runbooks sit at higher price points.