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The Pragmatic Engineer
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Real-world engineering challenges: building Cursor
- Cursor, an AI-powered IDE by Anysphere, has gained popularity among engineers and recently raised $900M in a Series C round, valuing the company at $9.9B.
- Anysphere's Cursor is used by over half of the top 500 tech companies on the Fortune 500.
- The latest major release, Cursor 1.0, includes AI code review, background agents, and memory support for past chats.
- Cursor's tech stack includes TypeScript, Rust, Turbopuffer, Datadog, and more.
- Engineering challenges faced by Cursor include scaling problems, cold start issues, sharding challenges, and database migration to Turbopuffer.
- Anysphere's engineering culture involves regular releases, conservative feature flagging, dedicated infra team, and experimentation processes.
- Cursor employs 50 engineers, processes 1M transactions per second, and generates over $500M in annual revenue.
- Cursor uses TypeScript, Electron, Rust, and databases like Turbopuffer and Pinecone in its tech stack.
- The autocomplete feature in Cursor uses a low-latency sync engine and encrypted context for server-side inference.
- Cursor's chat feature works without storing code by utilizing codebase indexes and Merkle trees for efficient searches.
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