Founding Software Engineer

flint; San Francisco (CA); On-site; USD 180,000 - 320,000; Full time

Job summary

Flint in San Francisco, CA is seeking a founding Software Engineer to build the systems powering AI-native websites. You will shape the technical architecture and culture at a startup redefining the internet.

You will own end-to-end projects across frontend, backend, and infrastructure, deploying robust evals, observability, and testing. Expect rapid prototyping, architectural leadership, and a strong product-first engineering ethos.

Qualifications

• Product-first engineer with strong focus on user experience.
• Strong full-stack engineering experience across frontend, backend, and infra.
• Proficient with AI-forward developer tools (Claude Code, Cursor, Copilot).
• Take ownership from problem to solution and learn what you need.
• Love building MVPs, test with users, and iterate quickly.

Responsibilities

• Build agentic systems that design and launch web experiences.
• Develop and maintain Flint's core application across frontend, backend, and infrastructure.
• Design systems with robust evals, observability, and testing for reliability.
• Prototype rapidly with users and translate learnings into durable features.
• Lead architectural decisions that set Flint's technical direction for years.
• Own projects end-to-end from prototypes to production systems.

Skills

Product-first

Full-stack

Ownership

MVP prototyping

User experience

AI tooling

Tools

Claude Code

Cursor

Copilot

Job description

As Founding Software Engineer, you'll build the systems that power AI-native websites, shaping the technical architecture and culture of a company defining the next era of the internet.

Role scope

• Build agentic systems that design and launch web experiences, leveraging cutting-edge AI techniques.
• Develop and maintain Flint's core application across frontend, backend, and infrastructure.
• Design systems with robust evals, observability, and testing to push the frontier of AI reliability.
• Prototype rapidly with users and translate learnings into durable features.
• Lead architectural decisions that set Flint's technical direction for years to come.
• Own projects end-to-end: from prototypes that test new ideas with users to production systems that serve as the foundation for our platform.

We've already tackled problems such as:

• SOTA applied AI for frontend code generation and design systems
• Novel UX patterns for AI-first software
• Distributed multiplayer systems for collaborative editing
• AST parsing and manipulation for generative code
• …and there's much more ahead.

Basic qualifications

• You are a product-first engineer who cares deeply about user experience.
• You have strong full-stack engineering experience and are excited to work across the stack.
• You regularly use the latest AI-forward developer tools (Claude Code, Cursor, Copilot, etc).
• You take ownership from problem to solution, learning whatever you need to succeed.
• You love building MVPs, testing them with users, and iterating quickly.

Preferred qualifications

• Have used website builders (e.g. Webflow or Framer) or CMS platforms (Sanity, Contentful, Strapi).
• You have built an AI product before
• Experience working in early-stage startups or small teams

$150K - $250K | Offers equity