Indexable

sandbox infrastructure for AI agents

Founding Engineer (AI-first)

$150K - $175K0.75% - 1.50%San Francisco, CA, US
Job type
Full-time
Role
Engineering, Embedded systems
Experience
3+ years
Visa
US citizen/visa only
Skills
C, Rust, Unix
Connect directly with founders of the best YC-funded startups.
Apply to role ›
Andrew Gazelka
Andrew Gazelka
Founder

About the role

passion > intelligence > knowledge. no specific domain knowledge is required, though it helps. we care more that you are obsessed with building systems that work beautifully, that you notice when something is slightly wrong, and that you will not rest until it is better than it was.

bonus points if you:

  • think a lot about what makes companies AGI-proof
  • were an early claude code / codex / GPT 3 user
  • obsessed with AI improvement fly wheels
  • are ready to make huge sacrifices in order to make ix succeed.

the stack:

  • hypervisor we wrote our own VMM on top of KVM. it can fork a running sandbox in milliseconds.
  • storage all data flows through a content-addressable storage engine with tiered caching and automatic deduplication across tenants.
  • transport the storage fabric runs over libfabric so we can move from TCP to RDMA without rewriting application code.
  • filesystem guests see local filesystems backed by the content-addressable storage layer.
  • nix we vendor a custom fork of snix (nix reimplemented in rust) for reproducible builds.
  • kernel we maintain a custom linux 6.19 kernel with patches for features upstream does not support yet.
  • tooling we maintain a custom clippy so that agents write code that meets our standards without waiting on upstream.

About Indexable

We provide sandbox infrastructure for AI agents.

Agents can fork real environments, run code, use the terminal, and roll back or branch again in milliseconds. We work across the full stack, from virtualization and storage to SDKs and developer UX, with a strong bias toward correctness, performance, and simple systems.

Indexable
Founded:2026
Batch:P26
Team Size:3
Status:
Active
Location:San Francisco
X (Twitter) logo
Founders
Andrew Gazelka
Andrew Gazelka
Twitter account
Founder