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

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. Timestamps: (00:00) Introduction (01:49) Defining Infrastructure in the AI Era (03:15) The Fourth Pillar: AI's Role in Infrastructure (06:01) Historical Context and Evolution of Infrastructure (08:20) The Impact of AI on Software Development (10:18) Investment Strategies and Market Dynamics (17:02) Developer Tools and AI Integration (20:57) Defensibility in the AI Landscape (22:16) Founders' Intuition and Industry Progress (22:26) Defensibility in AI Infrastructure (24:00) Expansion and Contraction Phases in the Industry (24:35) The Role of Layers in Market Consolidation (27:43) The Future of AI Models and Specialization (29:27) The Decade of AI Agents (29:54) Context Engineering and New Infrastructure (34:23) The Evolution of Software Development (42:13) Horizontal vs. Vertical Integration in AI (43:54) Conclusion and Final Thoughts Resources: Find Martin on X: https://x.com/martin_casado Find Jennifer on X: https://x.com/JenniferHli Find Matt on X: https://x.com/BornsteinMatt Stay Updated: Let us know what you think: https://ratethispodcast.com/a16z Find a16z on Twitter: https://twitter.com/a16z Find a16z on LinkedIn: https://www.linkedin.com/company/a16z Subscribe on your favorite podcast app: https://a16z.simplecast.com/ Follow our host: https://x.com/eriktorenberg 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. Stay Updated: Find a16z on X Find a16z on LinkedIn Listen to the a16z Show on Spotify Listen to the a16z Show on Apple Podcasts Follow our host: https://twitter.com/eriktorenberg 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. Hosted by Simplecast, an AdsWizz company. See pcm.adswizz.com for information about our collection and use of personal data for advertising.