How Stripe Rebuilt Its Payment Infrastructure for 100 Million API Calls a Day

Episode notes

In this episode, Lucas and Luna dive into Stripe's architectural overhaul of its core payment processing pipeline to handle over 100 million API calls per day. They explore the key decisions: migrating from a monolithic Rails app to a service-oriented architecture, the introduction of a custom idempotency layer, and how Stripe used deterministic simulation testing to ensure correctness at scale. Lucas breaks down the trade-offs between consistency and availability in payment systems, and Luna questions the operational complexity of managing hundreds of microservices. The conversation also touches on Stripe's cultural approach to reliability - embedding SRE principles directly into development teams rather than centralizing them. No hype, just concrete engineering details from one of the most demanding production environments in fintech. #Stripe #PaymentInfrastructure #APIScale #Microservices #Idempotency #DeterministicSimulation #SRE #PaymentProcessing #Fintech #SystemArchitecture #Scalability #Reliability #BusinessAndTechnology #FexingoBusiness #BusinessPodcast #CTOPodcast #TechnicalLeadership #EngineeringOrg Keep every episode free: buymeacoffee.com/fexingo

Related episodes across the Index

Other episodes covering the same guests and topics, from across The B2B Podcast Index.

• Trust, stablecoins, and the AI margin squeeze:What McKinsey and QED's fintech report means for banksTearsheet Podcast: Exploring Financial Services Together · on Stripe89 / 100
• Fintech Recap: ALT5 Sigma, Increase & Fed Master AccountsFintech Business Podcast · on Stripe86 / 100
• The API of the Physical World: Sy Bohy on the Future of Connected HardwareHow I Grew This: Real Stories of Digital Growth · on Stripe81 / 100
• Why the Best Fintech Companies Are Staying Private With Sahej Suri, Founder of Blue Dot InvestorsFintech One-On-One · on Stripe81 / 100
• #40: FX & Global Payments Insights with Marc Racette CEO of PulseFXFintrepreneur · on Stripe78 / 100
• MicroConf Tactics: Start a SaaS From $0 in 2026MicroConf On Air · on Stripe77 / 100

• How Datadog Scaled Engineering Without Burning Out82 / 100
• How Slack Scaled Engineering Without Adding Headcount
• How Atlassian Tamed Technical Debt With Architecture Contracts
• How Atlassian Tamed Technical Debt With Architecture Contracts
• How GitHub Tamed Merge Conflict Chaos