Demos by Runtime, Paper Instruments, Lark, 21st, Replicas.

Every AI demo looks impressive. Building AI that works reliably in production is a different story. Hear from YC founders at Runtime, 21st, Paper Instruments, Replicas, & Lark share the technical decisions, tradeoffs, & hard-won lessons behind the products they're building.

Agenda

6:00: Doors open. Tapas & sushi, drinks, mingling

6:30 - 7:30: Five YC founders share how they're building on the agentic stack

Runtime lets non-engineering teams build & run cloud agents without managing the infrastructure.

Paper Instruments post-trains LLMs to accelerate knowledge work.

Lark is an AI testing platform that helps engineering teams catch product issues faster with self-healing end-to-end tests.

21st is a marketplace for browsing & publishing crafted React UI components, themes, & templates that developers can drop into their projects.

Replicas is a background coding agent that turn tickets into PRs.

7:30 - 8:00: More networking

About E2B

E2B gives AI agents computers with real-world tools. Fast, secure, & built for scale, it powers the infrastructure behind Manus, Genspark, Lindy, & over 120 YC companies.