Founding Engineer

Weekday AI

San Francisco, California, United States permanent

Posted: July 29, 2025

Job Description

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

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