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The Future of Software Development - Vibe Coding, Prompt Engineering & AI Assistants

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July 21, 2025

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Is AI the Fourth Pillar of Infrastructure?

Infrastructure doesn’t go away — it layers. And today, AI is emerging as a new foundational layer alongside compute, storage, and networking.

Erik Torenberg interviews a16z’s Martin Casado, Jennifer Li, and Matt Bornstein breaking down how infrastructure is evolving in the age of AI — from models and agents to developer tools and shifting user behavior.

We dive into what infra actually means today, how it differs from enterprise, and why software itself is being disrupted. Plus, we explore the rise of technical users as buyers, what makes infra companies defensible, and how past waves — from the cloud to COVID to AI — are reshaping how we build and invest.

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Please note that the content here is for informational purposes only; should NOT be taken as legal, business, tax, or investment advice or be used to evaluate any investment or security; and is not directed at any investors or potential investors in any a16z fund. a16z and its affiliates may maintain investments in the companies discussed. For more details please see a16z.com/disclosures.

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Vibe Coding, Prompt Engineering & AI AssistantsIs AIFourth PillarInfrastructure InfrastructureErik TorenbergMartin Casado Jennifer LiMatt BornsteinTimestamps Introduction

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The Future of Software Development - Vibe Coding, Prompt Engineering & AI Assistants · A16z · Sentinel