How Peloton Engineers the World’s Largest Live Fitness Events on AWS

This article details how Peloton engineers Turkey Burn, one of the most technically demanding real-time fitness events, achieving two consecutive zero-incident events on AWS infrastructure.

• Handles "thundering herd" traffic pattern with 34.6K simultaneous participants, surpassing 2023 Guinness World Record
• Multi-cluster, multi-AZ EKS architecture with Istio service mesh processing 7.27B requests at 452K peak RPS
• Pre-warms all infrastructure and segments traffic into tier-0 (critical) and non-tier-0 services with isolated protection
• Uses Amazon MSK, ElastiCache, RDS, DynamoDB, and custom GateKeeper query routing for sub-second leaderboard latency
• Employs Karpenter for node provisioning with 10-20% annual compute savings and EC2 Capacity Reservations
• Conducts monthly production load testing at 2.5x peak traffic, reducing Turkey Burn costs by 40% versus dedicated test environments
• Embeds cost optimization as engineering discipline with weekly ops reviews and on-call accountability for cost anomalies

Peloton demonstrates that at massive scale, performance and cost discipline are complementary priorities, with architectural patterns applicable to any high-concurrency, latency-sensitive workload.