Founding AI Engineer

flint; San Francisco (CA); On-site; USD 150,000 - 230,000; Full time

Job summary

Flint is seeking a product-first engineer to design and deploy AI-powered web experiences, employing prompt engineering and multi-agent architectures. You will implement production-grade agentic systems and work across frontend, backend, and infrastructure.

You will lead RAG workflows, strengthen evals and observability, and shape architectural decisions while shipping MVPs and iterating rapidly based on user feedback.

Qualifications

• Product-first engineer with hands-on AI product deployment.
• Experience with prompt engineering, context optimization, and model fine-tuning.
• Strong full-stack skills with AI integration in web apps.
• Ownership mindset and quick learning in fast-paced settings.

Responsibilities

• Design and build production-grade AI-powered web experiences.
• Architect and optimize RAG systems with context engineering.
• Improve engineering processes with robust evals, observability, and testing.
• Develop and maintain the core frontend, backend, and infra.
• Shape technical vision and lead architectural discussions.
• Create prototypes to gather rapid user feedback.

Skills

Product-first engineer

AI product deployment

Prompt engineering

Context optimization

Model fine-tuning

Full-stack AI

Cursor Windsurf

Ownership mindset

Fast-paced environment

MVP development

User feedback iteration

Tools

Cursor

Windsurf

Job description

Role scope

• Designing and implementing production-grade agentic systems that power web experiences and marketing workflows, leveraging advanced prompt engineering and multi-agent architectures to do so


• Architecting and optimizing RAG (Retrieval-Augmented Generation) systems with context engineering


• Strengthening our engineering processes through robust evals, observability, and testing


• Developing and maintaining the core application across frontend, backend, and infrastructure


• Shaping our technical vision and leading architectural discussions. You'll make foundational decisions that influence both Flint's technical architecture and engineering culture.


• Creating and testing prototypes to gather rapid feedback from users

Basic qualifications

• You are a product-first engineer


• You have built and deployed AI products that real users depend on


• You have extensive hands-on experience with prompt engineering, context optimization, and model fine-tuning


• You have strong full-stack engineering skills with experience integrating AI into web applications


• You regularly use AI IDEs like Cursor or Windsurf to code


• You take ownership of problems from start to finish and are eager to learn whatever you need to succeed


• You are comfortable in a fast-paced environment with evolving requirements


• You have enthusiasm for building MVPs and iterating based on user feedback

Preferred qualifications

• You have experience using AI for design system automation and component generation.


• You have a lived understanding of using a website builder (e.g. Webflow or Framer) and/or CMS (e.g. Sanity, Contentful, Strapi).


• Former founder or early-stage founding employee experience.