Founding AI Engineer — Enterprise Agent Platform (SF On-site)

Wintermeyer Ventures; San Francisco (CA); On-site; USD 180,000 - 280,000; Full time

Job summary

Wintermeyer Ventures in San Francisco, California, USA is seeking a founding engineer to own large parts of our product end-to-end, working at the intersection of LLMs, unstructured data, and complex enterprise workflows where getting the answer right matters.

You will build AI agents and backend features from scratch, ship production capabilities from discovery through deployment, and work on-site with enterprise customers to deeply understand their workflows, data, and pain points.

Qualifications

• 2+ years of experience building and shipping production LLM or AI agent systems.
• Strong proficiency in TypeScript and backend development.
• Hands-on prompt engineering, eval design, and agentic workflow design.
• Background at an early-stage or high-growth startup, with shipping real work.
• Active use of agentic engineering tools as part of workflow.
• Comfortable working directly with enterprise customers and occasional on-site travel.

Responsibilities

• Build new AI agents and product features from scratch, owning entire modules from customer discovery through production deployment.
• Work on-site with enterprise customers to deeply understand their workflows, unstructured data, and pain points.
• Design and iterate on eval frameworks to ensure AI agents produce accurate, reliable outputs in specialized regulated domains.
• Build backends that ingest, structure, and reason over large volumes of unstructured data using LLMs.
• Act as a full-stack problem solver: writing code, conducting user research, self-educating on domain topics, and doing whatever it takes to make customers successful.

Skills

TypeScript

Backend development

Prompt engineering

Eval design

Agentic engineering

Enterprise software

Education

CS degree or STEM equivalent

Job description

Wintermeyer Ventures in San Francisco, California, USA is seeking a founding engineer to own large parts of our product end-to-end, working at the intersection of LLMs, unstructured data, and complex enterprise workflows where getting the answer right matters.

You will build AI agents and backend features from scratch, ship production capabilities from discovery through deployment, and work on-site with enterprise customers to deeply understand their workflows, data, and pain points.