Remote Senior AI Engineer: Build & Scale Production LLMs

Ruby Labs Ltd. is seeking a Senior AI Engineer to own and scale the AI layer of a core D2C subscription product. You will own production LLM features, structured outputs, evaluation, observability, and model selection from experiment to live release, with a focus on quality, reliability and cost. Work in a modern TypeScript stack—Next.js, Cloudflare Workers, and containers—and drive end-to-end automation, from prompt systems to browser automation using LangChain, LlamaIndex, and OpenRouter-like

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