Founding Full-Stack Engineer — Build Core Product (SF)

Weekdayworks; San Francisco (CA); On-site; USD 150,000 - 210,000; Full time

Job summary

Weekdayworks in San Francisco on-site is looking for an early hire / founding engineer to build the core product from the ground up. You’ll own major surfaces and ship end-to-end features in a hands-on role, thriving in ambiguity and taking ownership from day one.

The role emphasizes TypeScript, React, and Node.js with a startup mindset; you’ll design APIs, collaborate with founders and design, and help establish engineering best practices while moving fast with modern AI tooling.

Qualifications

• 2–8 years of experience in web development.
• Strong proficiency with TypeScript, React, and Node.js.
• Startup or founding-engineer background (or equivalent) is a plus.

Responsibilities

• Build end-to-end product features across frontend and backend.
• Ship quickly in 0-1 environments.
• Design APIs, schemas, and workflows.
• Partner closely with founders, product, and design.
• Improve reliability, performance, and developer experience.
• Establish engineering best practices.
• Use modern AI developer tools to move faster (LLM copilots, agent workflows, testing automation).

Skills

TypeScript

React

Node.js

Tools

Next.js

Postgres

Redis

AWS

Job description

Weekdayworks in San Francisco on-site is looking for an early hire / founding engineer to build the core product from the ground up. You’ll own major surfaces and ship end-to-end features in a hands-on role, thriving in ambiguity and taking ownership from day one.

The role emphasizes TypeScript, React, and Node.js with a startup mindset; you’ll design APIs, collaborate with founders and design, and help establish engineering best practices while moving fast with modern AI tooling.