Modern Cloud Has Seven Layers, Not Three — Here's What Actually Changed

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The traditional three-tier cloud model of IaaS, PaaS, and SaaS no longer reflects how modern infrastructure actually works, with the stack having expanded to seven distinct levels over the past 18 months. The boundary between 'warm' always-on servers and 'cold' serverless functions has blurred, as platforms like Vercel and Google Cloud Run now offer hybrid billing models that combine traits of both. The term 'serverless' has also fragmented into at least four distinct categories — functions, containers, edge isolates, and serverless databases — each with very different constraints and limits. Meanwhile, significant capital has shifted toward the database layer, highlighted by Databricks acquiring serverless Postgres startup Neon for approximately $1 billion despite the company generating around $25 million in revenue. A new infrastructure layer has also emerged to support AI agents that autonomously write and execute code, signaling a fundamental reshaping of how cloud computing is structured and taught.

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