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Spherecast (YC S24) · 1 month ago

LLM Engineer

San Francisco, CA

Full-time

Onsite

Mid Level

$110K/yr - $200K/yr

Spherecast is a company focused on leveraging AI for supply chain management. As an LLM Engineer, you will build and manage the AI Supply Chain Manager, Agnes, overseeing the development from prototypes to production and ensuring effective real-world outcomes.

ConsultingE-CommerceSoftware

Responsibilities

Building Agnes from the ground up

Own AI systems end-to-end: from prototypes to production, from prompts to tested and evaluated pipelines, from agents to real-world outcomes (POs, TOs, bookings)

Work directly with the core team to turn the physical flow of goods into something as programmable as code

Qualification

LLM APIsLarge language model selectionHuggingFace ecosystemLLM-powered automationsEvaluation pipelinesPrompting skillsLLM observabilitySystem design skillsSelf-hosted LLMs

Required

Hands-on experience with modern LLM APIs (e.g. Anthropic, OpenAI, DeepSeek, OpenRouter, Gemini, Moonshot) and have shipped features using them

Strong intuition for large language model selection – you understand the strengths, weaknesses, latency/cost tradeoffs, and ideal use cases of different LLMs

Practical experience with the HuggingFace ecosystem in real projects

A track record of building LLM-powered automations or agents that are core to a production system, not just internal demos or playgrounds

Experience designing and maintaining evaluation pipelines to iterate quickly and safely on prompts and workflows

Strong prompting and system-design skills – you know how to design tools/functions, structured outputs, and multi-step agent flows that are robust to edge cases

Experience with LLM observability and monitoring (logging, traces, quality metrics, feedback loops) to track and improve production accuracy over time