YC-Backed Moss Seeks Senior SDK Engineer to Expand Real-Time AI Search Across Languages

Moss, a startup from Y Combinator's F25 batch, is hiring a Senior or Staff SDK Engineer to drive its real-time semantic search layer for conversational AI. The job listing appears on Y Combinator's company jobs board, according to ShortSingh, while Hacker News provided deeper details on the role's scope and the company's scale.

ShortSinghYC-Backed Moss Is Hiring a Software Engineer for SDK Role

Moss delivers sub-10 millisecond retrieval for voice AI applications, serving more than 5 million real-time voice minutes across over 100 countries, Hacker News reported. The company builds a real-time semantic search layer designed for conversational AI, making speed and cross-platform consistency critical. The SDK Engineer will own and evolve SDKs across JavaScript/TypeScript, Python, Swift, Android, Elixir, C, and Rust.

"The role involves building bindings around their Rust core, improving performance, cross-platform parity, and developer experience."

This focus on a Rust core with bindings across so many languages underscores Moss's ambition to be a backend agnostic layer for voice AI, not just a single-platform tool. ShortSingh noted that the job listing was posted on Y Combinator's board, but did not disclose specific location, compensation, or requirements beyond targeting engineers with relevant skills.

The opening targets a senior or staff-level engineer, suggesting Moss is ready to invest in long-term infrastructure rather than quick prototypes. Hacker News highlighted that the SDK Engineer will work on improving performance, cross-platform parity, and developer experience, which are all essential for maintaining reliability across the diverse voice AI applications Moss serves.

With the sub-10ms retrieval benchmark and extensive language support, Moss is positioning itself as a critical piece of the real-time AI stack. The hire will directly shape how developers interact with the service, making this role central to the company's growth strategy.