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Coffee With Developers • Feb 2, 2026

API‑First: How Twilio Designs for Developers - Justin Kitagawa (Twilio)

Justin Kitagawa

Justin Kitagawa asserts that trust is your true API product. Abandon the disconnected feature factory mindset. Learn how Twilio engineers composable, backward-compatible building blocks for five-nines availability.

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#1 about 2 min

Twilio's core mission and responsibilities

An overview of the communication platform and the systems managed behind console and API endpoints.

#2 about 2 min

Maintaining high availability for critical infrastructure

Why focusing on operational excellence is necessary to achieve extreme availability metrics.

#3 about 1 min

Onboarding users through the developer console

How the console acts as the entry point for provisioning API keys and programmatic access.

#4 about 4 min

Prioritizing backward compatibility in API design

The importance of supporting existing endpoints to ensure mission-critical systems and hardware integrations do not break.

#5 about 4 min

Designing composable APIs as platform building blocks

How decomposing complex actions into reusable primitives allows customers to build custom communication workflows.

#6 about 5 min

Prioritizing impact over raw feature development

Why product teams should investigate the root intent of customer requests rather than purely becoming a feature factory.

#7 about 3 min

Overcoming organizational silos to effectively unite platforms

How aligning different channels and acquisitions prevents the product structure from suffering under Conway's Law.

#8 about 3 min

Modernizing customer support with AI and multi-channel handoffs

How combining traditional telephone technology with asynchronous chat and AI creates seamless user experiences.

#9 about 8 min

Engineering practices for extreme platform reliability

Adopting an operational mindset through cross-team alignment, incremental deployments, and cellular architecture to isolate hardware failures.

#10 about 5 min

Synchronizing documentation and SDKs declaratively

Using OpenAPI specifications to automatically generate consistent helper libraries and reference code across programming languages.

#11 about 3 min

Scaling the developer console for enterprise structure

Transitioning a platform interface to support complex organizational access controls and sub-organization management.

#12 about 3 min

Maintaining simplicity while serving enterprise complexity

Preserving the quick time-to-value for individual developers even when building advanced enterprise features.

#13 about 4 min

Treating developer documentation as a primary product

Why high-quality, self-service documentation is critical for preventing support tickets and teaching AI models.

#14 about 4 min

Securing AI agents through scoped authorization

Addressing security challenges by utilizing playgrounds and restricted permissions to safely run language models.

#15 about 4 min

Establishing trusted communications against AI spoofing

Proving brand ownership over phone numbers to combat voice cloning and fraudulent telecommunication activities.

#16 about 3 min

Opportunities for utilizing telecommunication APIs

Encouraging developers to explore communication workflows and share feedback on improving the developer experience.

#17 about 4 min

Surviving sudden scale events and malicious traffic

Lessons learned from massive traffic spikes and protecting infrastructure using cloud partner rulesets to block bad actors.

Matching moments

1:40 min

Summarizing key engineering lessons for platform API development

Anto Anto · WWC 2024

4:42 min

Practical guidance for developing trustworthy AI applications

Christoph Bräunlein Christoph Bräunlein +3 · WWC 2025

3:32 min

Designing outstanding APIs with simplicity, safety, and evolvability

Anto Anto · WWC 2024

3:26 min

Designing APIs for security from day one

Philippe De Ryck · LIVE

3:20 min

Architecting the platform with modern cloud and mobile technologies

Tom George · LIVE

1:44 min

Summarizing developer experience and artificial intelligence companions

Robert Hoffmann Robert Hoffmann +1 · LIVE

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