Founding Engineer

Posted Yesterday
Be an Early Applicant
San Francisco, CA, USA
In-Office
Mid level
Artificial Intelligence • HR Tech • Professional Services • Software
The Role
Build and scale an AI-powered full‑stack editor and experimentation platform. Implement backend services, ship intuitive React UIs, integrate APIs and AI models, collaborate with founders and customers, and own end-to-end features in a fast-paced startup.
Summary Generated by Built In

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.

RequirementsWhat 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

Skills Required

  • 3+ years of software engineering experience
  • Comfortable working across the stack (Python, React)
  • Prior experience building user-facing products
  • Strong problem-solving ability and bias for action
  • Strong communication and collaboration skills
  • Full-time, in-person role based in San Francisco (Mon-Sat)
  • Must be authorized to work in the U.S.
  • 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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The Company
0 Employees
Year Founded: 2021

What We Do

Weekday is an AI-powered recruitment platform that helps startups hire top-tier engineering and product talent. By leveraging a massive database of white-collar professionals and advanced outreach tools, the company streamlines the hiring process through automated sourcing, AI-driven resume screening, and white-glove contingency services. Their mission is to modernize recruitment by enabling companies to discover and engage passive candidates efficiently, ensuring high-quality hires for critical roles.

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