Founding LLM Engineer

Founding LLM Engineer#### Location San Francisco### About this role

As a LLM Engineer at Sphere cast, you will be responsible for building Agnes from the ground up – our AI Supply Chain Manager that decides what to produce, where to make it, and how to move it through factories, warehouses, and channels.

This is a fast-paced, highly autonomous role for someone who can 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). You’ll work directly with the core team to turn the physical flow of goods into something as programmable as code.

If you’re a builder who thrives at the intersection of LLMs, agents, systems engineering, and messy real-world data, this is your opportunity to shape how global brands run their supply chains.### What we’re looking forYou are a great fit if you have:
* Hands-on experience with modern LLM APIs (e.g. Anthropic, OpenAI, Deep Seek, Open Router, 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 Hugging Face 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.
* Bonus Experience running self-hosted LLMs in production or serious prototypes.## Founding LLM Engineer Explore more opportunities that match your interests

Sphere cast (YC S24) offers a competitive compensation package for the Founding LLM Engineer role. The salary range is USD 110k - 200k per year, plus Competitive equity. Apply through Clera to learn more about the full compensation details.

The Founding LLM Engineer role at Sphere cast (YC S24) involves As a LLM Engineer at Sphere cast, you will be responsible for building Agnes from the ground up – our AI Supply Chain Manager that decides what to produce, where to make it, and how to move it through...Sphere cast (YC S24) is a leading AI/ML company. The Founding LLM Engineer role offers competitive compensation.

The Founding LLM Engineer position at Sphere cast (YC S24) is based in San Francisco, United States and is on-site. Contact the company through Clera for specific work arrangement details.

You can apply for the Founding LLM Engineer position at Sphere cast (YC S24) directly through Clera. Click the "Apply Now" button above to start your application. Clera's AI-powered platform will help match your profile with this opportunity and guide you through the application process. You can also learn more about Sphere cast (YC S24) on their website.
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