Process, Questions & AI Prep Tips
PagerDuty is the platform engineers rely on when production is down — routing critical alerts, managing on-call schedules, and coordinating incident response. Engineering interviews emphasize the reliability engineering and real-time notification infrastructure that powers a product that must itself never fail. PagerDuty has a uniquely high internal bar for reliability since their product is used during their customers' worst moments.
A 30-minute call about your background in reliability engineering, notification infrastructure, or incident management platforms.
A 60-minute coding interview with algorithm and data structure problems, sometimes including scheduling or notification routing scenarios.
Design a core PagerDuty system such as the alert routing and escalation engine, on-call schedule management, real-time notification dispatch, or the event intelligence deduplication system.
Two to three rounds covering deep systems design, coding, and behavioral interviews emphasizing reliability mindset and incident response culture.
Design PagerDuty's alert routing system that routes incoming alerts to the correct on-call engineer within seconds.
How would you build an on-call schedule management system with rotation, override, and gap detection?
Design a notification dispatch system that delivers critical alerts via phone, SMS, email, and push with ordered escalation.
How would you implement event deduplication and intelligent grouping to reduce alert fatigue?
Design a global failover architecture for PagerDuty itself — how do you ensure it never goes down?
How would you build a machine learning system that predicts alert severity and auto-triages incidents?
Design a real-time incident timeline that tracks all actions taken during an incident for post-mortem analysis.
How would you build a webhook delivery system that guarantees delivery even when customer endpoints are unavailable?
Design a status page system that provides real-time service health visibility to customers during incidents.
Tell me about a time you improved the mean time to resolution (MTTR) for production incidents in your organization.
Study reliability engineering fundamentals including SLOs, error budgets, and how to design systems that self-heal.
Understand notification delivery challenges — phone/SMS delivery via Twilio-style APIs, push notification reliability, and how to guarantee delivery under network failures.
Practice designing escalation workflows with complex rule engines — time-based escalation, team rotations, and override scenarios.
PagerDuty itself is a reliability-critical system — prepare to discuss how you would design PagerDuty to have higher availability than any system it monitors.
Review event stream processing for alert deduplication including time-window correlation, signature hashing, and ML-based grouping.
Demonstrate genuine understanding of on-call culture and how engineers interact with alerting systems during stressful incidents.
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