About the role
We built Moss because Voice AI breaks when retrieval is slow. Most retrieval infrastructure was not built for real-time reasoning. It adds latency, breaks context mid-conversation, and becomes the bottleneck just as an AI product needs to feel instant.
Moss is the real-time semantic search layer for conversational AI. We deliver sub-10ms retrieval directly in the browser, at the edge, on-device, or in the cloud, without making teams stitch together a slow retrieval stack.
We are backed by YC and run in production for teams building serious AI products. Moss is deployed across 100+ countries, serves 10M+ of real-time voice minutes, supports enterprises serving 3000+ of their own end customers, and has 390K+ package installs.
The SDKs are how every one of those developers meets Moss. They are the first thing a team touches, the surface that has to feel instant on every platform, and the layer where our Rust engine becomes real code running inside someone else's product.
We are looking for a Senior or Staff SDK Engineer to own how Moss ships across every developer surface: JavaScript/TypeScript, Python, Swift, Android, Elixir, C, and the Rust core they all bind to.
This is not a greenfield role. You will work on live SDKs that customers depend on in production from day one: shrinking bundle size, lowering cold-start and query latency, tightening cross-platform parity, improving developer ergonomics, and making integration effortless across browsers, servers, mobile devices, edge runtimes, and embedded environments.
When milliseconds and correctness are both part of the product, and your code runs inside someone else's application, your work defines whether teams trust Moss.
What you'll do
- Own the architecture and evolution of Moss SDKs across multiple programming languages and platforms.
- Design and maintain safe, ergonomic bindings around our Rust core.
- Build and improve FFI layers, packaging systems, release pipelines, versioning strategies, and developer tooling.
