About this opportunity
Arcadia lists this Senior Software Engineer (AI) opportunity in san francisco, California. Review the employer’s description below for duties, qualifications and application requirements.
Job description
A high-growth startup is building the infrastructure to measure how LLMs actually perceive and process data, giving teams visibility into model behavior that's historically been a black box. They're hiring a Senior Software Engineer to join the founding team for a true 0→1 opportunity, architecting the core product alongside a small, technical founding group.
You'll move fluidly across frontend, backend, and applied AI, including building and orchestrating AI agents end to end, with real ownership in a fast-paced, autonomous environment.
The Stack
TypeScript/React on the frontend, Python on the backend. You'll be working directly with LLMs and model outputs, building the evaluation and measurement frameworks from scratch.
What You'll Do
Own full stack architecture decisions from day one, spanning frontend to backend
Design and build systems that evaluate and quantify LLM perception of structured and unstructured data
Build and orchestrate agentic workflows for automated evaluation, data processing, and model behavior analysis
Work directly with LLMs and model outputs to build novel measurement and evaluation frameworks
Ship product end to end, from data pipelines to user-facing interfaces
Set technical standards and engineering culture as one of the first hires
Work directly with founders and have real say in product features, roadmap, and technical decisions
What Makes You a Fit
Strong full stack experience with TypeScript, React, and Python in production environments
Hands-on experience building with or around LLMs, whether that's evals, fine-tuning, RAG, or applied AI product work
Founding engineer, founder, or very early-stage startup experience, comfortable with ambiguity and moving/shipping fast
Genuinely excited to be hands-on at every layer of the stack
Why This Role
One of the first engineering hires at a high-growth, well-backed startup tackling a problem that's only getting more critical as LLMs get embedded everywhere. Huge ownership, huge technical surface area, and a real seat at the table for foundational product decisions.
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Worksite address
san francisco, CA, 94199, US
Who can apply
Review the original listing for work authorization, qualifications and employer requirements.