Founding Engineer

Weekday AI
Full-time
On-site

This job is for a client of Weekday. One of the fastest growing YC startups. We will fast track your application if you apply here.

About Us

We’re an early-stage startup building AI-driven tools that help consumer apps optimize user experiences automatically. Our product is already live and used by millions globally, with rapid month-over-month growth.

We’re backed by top-tier investors and operators, and we’re just getting started.

Raised more than $5mn and recently launched the product

The Role

We’re hiring a full-stack engineer to help us build and scale our AI-powered experience editor. You’ll work across the stack—front-end and back-end—and play a key role in shaping the product and infrastructure.

This is a high-impact role with lots of ownership, fast iteration, and exposure to real-world scale.

What You'll Do

  • Build core features of our AI-driven editor and experimentation platform
  • Write scalable back-end code and ship clean, intuitive UIs
  • Integrate new APIs and AI models to power smart user experiences
  • Collaborate closely with founders and customers
  • Own projects end-to-end in a fast-paced, hands-on environment

Details

  • Full-time, in-person role based in San Francisco (Mon–Sat)
  • Must be authorized to work in the U.S.

Requirements

What We're Looking For

  • 3+ years of software engineering experience
  • Strong problem-solving ability and a bias for action
  • Comfortable working across the stack (Python, React, etc.)
  • Prior experience building user-facing products
  • Strong communication and collaboration skills

Nice to Have

  • Experience with AI/ML tools or APIs
  • Familiarity with mobile platforms
  • Past experience at an early-stage or fast-growing company