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Weekday AI

Founding Engineer

Weekday AI, San Francisco, California, United States, 94199

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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.

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

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