Apr 20
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Justin Kitagawa, VP of Engineering at Twilio, shares how the company’s API-first philosophy treats the API as the product—and trust as what they sell. He explains Twilio’s “Lego block” approach to communication, where composable primitives for voice, SMS, and email power everything from customer support to life-critical services. The conversation dives into Twilio’s engineering culture of extreme reliability, including five-nines availability, fault isolation, and an “assume failure” mindset. Kitagawa also covers how Twilio scaled developer experience using OpenAPI as a single source of truth to generate SDKs, docs, and tools, why documentation is a first-class product, and how the platform is evolving to support enterprise customers and AI-driven workflows. 00:00 Introduction 01:44 Platform Evolution 07:02 Building APIs 15:02 Lessons Learned 22:03 Reliability First 29:01 SDK Challenges 32:00 Enterprise Shift 38:00 Docs Matter 41:15 AI and Security 44:57 Trust and Voice 47:49 Community Call 50:18 Challenges Faced 52:43 Conclusion ---------------- Coffee with Developers is a fireside chat series by WeAreDevelopers that creates space for honest conversations with the people who don’t just talk about technology, but build, ship, and scale it every day. Hosted by Chris Heilmann, each episode dives into the real stories behind the products, decisions, and careers shaping today’s technology landscape. Head to worldcongress.dev and save 10% with the code "wearedevs_yt" ----------------- #TwilioInterview #ApiDesign #DeveloperPlatforms #CoffeeWithDevelopers #PlatformReliability #EngineeringLeadership #ConsoleExperience #WebhooksInfrastructure #BackwardCompatibility #SdkDevelopment #EnterpriseDeveloperTools #OperationsMindset #AiInCommunications #VoiceAuthentication #TwilioApiTips