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Founding Engineer.

EngineeringRemote (US) · Visalia, CA HQ optionalFounding role · equity + revenue share
The honest deal

Founding equity + revenue share. No cash comp until we raise or revenue supports it — we mean that, and we say it up front.

sparx is a modular content and commerce OS — builder, commerce, CRM, CMS, email, B2B, and AI, on one data layer, one API, one bill. That is a lot of surface for a small team, which means you touch most of it.

You own features end to end: the Postgres schema, the Fastify API, the Next.js dashboard, and the tenant-facing site. We care that it ships, that it is correct, and that the next person can maintain it. Multi-tenancy runs on Postgres row-level security, auth is self-hosted, and most side effects are event-driven — the codebase has opinions, and you will add your own.

You work directly with the founder, pick up whole modules, and make calls that stick. If you want a narrow ticket queue, this is not the role. If you want range and ownership, it is exactly the role.

What you'll own

  • Features end to end — data model, API, dashboard UI, and the tenant-facing result
  • Whole modules over time, not slices of someone else’s design
  • The conventions that keep a fast-moving codebase readable six months later
  • Performance and correctness under real multi-tenant load, backed by row-level security
  • The judgment calls: what to build now, what to defer, and what to cut

What we're looking for

  • Strong full-stack TypeScript — at home in both React and a Node backend
  • Experience with our stack or close neighbors: Next.js, React, Fastify or similar, Prisma, Postgres
  • You ship — you would rather have something real in front of users than a perfect plan
  • You write code other people can read and change without you in the room
  • You want founding equity and range over a salaried IC seat at a bigger company — read the comp line

Nice to have

  • You have worked on multi-tenant SaaS, a platform, or infrastructure before
  • Comfort with GKE and Kubernetes, Pub/Sub, or other event-driven systems
  • Interest in MCP and building for AI as a first-class client, not a bolt-on

Apply for this role.

PDF, max 8 MB.

A real person — usually the founder — reads every application. No black hole, no bot screen.