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Engineering

Founding Full-Stack Product Engineer

Full-timeRemoteMultiple openingsReports to: Founder and Chief Executive Officer

Build what owners and our team use every day: the approval texts, the review console and the client view.

Apply

About SpareBrains

SpareBrains helps small and medium-sized businesses run better. A team of people and AI agents does real work for them. It finds where they’re losing customers online, fixes it, and keeps it running week after week. Our agents work inside our clients’ own accounts and tools, always with the owner’s approval. That makes trust the heart of what we sell.

The role

You’ll build the parts of SpareBrains that people touch. That means the owner’s yes-by-text approvals, the console where a person checks every item, and the owner’s view of results. You’ll own features end to end, talk to owners often, and ship fast without cutting corners on trust.

What you’ll do

Build the product

  • Own features end to end, from the database to the screen.
  • Build the review console where a person checks every agent action before it goes out.
  • Build the owner’s view: what changed, what’s waiting for their OK, and what it did for the business.

Work with owners

  • Talk to owners and our client team often, and turn what you hear into shipped changes.
  • Join a client launch now and then, to see the product in real use.

Your first 90 days

  • Day 30: ship your first features, and learn how a client launch works.
  • Day 60: own the design and rollout of a new part of the product.
  • Day 90: own its results, and help choose what we build next.

Example projects

  • A text approval flow that turns an owner’s yes into a logged, reversible change.
  • A review queue that shows a person exactly what an agent wants to change, and why.
  • A weekly results page an owner can read in a minute.

What you’ll bring

  • 3+ years building production web apps, ideally at an early-stage startup.
  • Strong TypeScript and React, plus Python or Node on the back end.
  • Some hands-on work with large language models: tool use, retrieval or evals.
  • Taste for simple, clear screens that busy, non-technical people can use.
  • You use AI coding tools every day.

You don’t need every item on this list. If the work excites you, apply anyway.

Nice to have

  • Experience as a founder or a first engineer.
  • Mobile development.
  • Integrations with older business systems.
  • A background in the trades or hospitality.

What we offer

A competitive base salary, equity, and the chance to build SpareBrains from its first day.

How to apply

Send your name, your email and your resume, with links to your work if you like. No cover letter needed.

Apply

Interview process

  1. Intro call. 30 minutes with our founder on the role, your work and your questions.
  2. Role interview. A deeper conversation about how you’d do the job, and the work you’ve done.
  3. Working session. We work through a real problem together, with any tools you like, AI included.
  4. References and offer. We speak to people you’ve worked with, then send the offer in writing.