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PagerDuty System Design Interview: Complete Preparation Guide

Ace PagerDuty's system design interview — learn about incident management questions, evaluation criteria, and a weekly preparation plan.

22 minUpdated Apr 25, 2026
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Interview format

4 rounds total.

System Design60 min

Design an incident management, alerting, or on-call scheduling system. Emphasis on reliability, low-latency notification delivery, and escalation logic.

Coding45 min

Algorithm problem, often related to scheduling, graph traversal, or event processing. Clean code and test awareness are valued.

Technical Deep Dive45 min

Discussion about a system you've built or operated. PagerDuty wants to understand your operational experience and incident response skills.

Values & Culture45 min

Behavioral round focused on PagerDuty's values: Champion the Customer, Run Together, Take the Lead, and Ack & Own.

Commonly asked systems

Design a real-time incident alerting and notification systemDesign an on-call scheduling and escalation engineDesign an event ingestion pipeline with deduplication and groupingDesign a multi-channel notification delivery system (SMS, push, call, email)Design a service dependency mapping and impact analysis systemDesign a status page with real-time incident updates

What they evaluate

Reliability EngineeringHigh

Can you design systems with 99.99%+ uptime? PagerDuty's alerting infrastructure must be more reliable than the systems it monitors.

Real-Time Event ProcessingHigh

Can you design low-latency event pipelines? An alert delayed by minutes during an outage costs customers real money.

Notification DeliveryMedium-High

Do you understand multi-channel delivery — SMS gateways, push notification services, voice calls, and email? Each has different latency and reliability characteristics.

Operational ExperienceMedium-High

Have you operated production systems? PagerDuty wants engineers who understand incident response, runbooks, and post-mortems from experience.

Customer Impact ThinkingMedium

Do you frame design decisions in terms of customer impact? Every second of notification delay matters when systems are down.

Tips

  • ▸Understand PagerDuty's event pipeline deeply — how events flow from integration to alert to notification to resolution
  • ▸Design for the 'alerting paradox': your alerting system must be more reliable than anything it monitors
  • ▸Study notification delivery channels in detail — each has unique failure modes, latency profiles, and cost structures
  • ▸Be prepared to discuss event deduplication, alert grouping, and noise reduction strategies
  • ▸Know escalation policy design — time-based escalation, round-robin, and override schedules
  • ▸Practice designing systems that degrade gracefully — if SMS fails, fall back to push, then email, then voice
  • ▸PagerDuty values operational experience — prepare stories about incidents you've responded to and lessons learned
  • ▸Think about the human element: on-call fatigue, alert overload, and how system design can reduce toil

Preparation roadmap

Week 1-2Foundations
  • ·Study event-driven architecture: message queues, pub/sub, and event processing patterns
  • ·Review notification delivery systems: APNS, FCM, SMS gateways, and email delivery
  • ·Understand reliability engineering: SLOs, SLIs, error budgets, and circuit breakers
  • ·Read PagerDuty's incident response guides and post-mortem best practices
Week 3-4Core Designs
  • ·Design an event ingestion pipeline with deduplication and intelligent grouping
  • ·Design a multi-channel notification system with fallback and retry logic
  • ·Design an on-call scheduling system with escalation policies
  • ·Practice estimating event throughput and notification delivery latency
Week 5-6Advanced Topics
  • ·Design a service dependency graph with automated impact analysis
  • ·Study anomaly detection for intelligent alert suppression
  • ·Design a globally distributed alerting system with region failover
  • ·Deep dive into exactly-once notification delivery and idempotency
Week 7-8Mock Interviews & Refinement
  • ·Complete 4+ mock interviews focused on reliability and alerting systems
  • ·Prepare a detailed walkthrough of a production system you built or operated
  • ·Practice incident response scenarios and post-mortem discussions
  • ·Review PagerDuty engineering blog posts on their architecture decisions
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