Planbase

Founding Engineer (Full-Stack)

San Francisco, US Full-time

We’re hiring founding engineers to help build the infrastructure behind the next generation of B2B software. This is a high-ownership role: you’ll work directly with the founders to shape the product, the company, and the way healthcare and staffing operations are run.

You’ll be among the first employees at an early-stage startup, which means challenge, uncertainty, and opportunity. This role isn’t for everyone — to be a good fit, you need to be hungry to move build, break and push boundaries.


What you’ll do

  • Ship fast, talk to customers, and build at the frontier of AI-native software.
  • Work across the stack — from re-architecting ML forecasting systems to delivering elegant user-facing features.
  • Build the platform infrastructure that allows AI to generate customer-specific apps, reports, and workflows.
  • Help define engineering culture and grow the team.

What kind of person we’re looking for

  • You must have already graduated or be graduating by December 2025.
  • High-energy, opinionated, and fun to work with.
  • Strong product taste.
  • You’ve built real products for real customers, not just internal tools or integrations.
  • You move quickly but maintain a high bar for quality — and expect the same from those around you.
  • You want to help build not just a product, but a company and a category-defining business.
  • Visa required but open to O-1 visa sponsorship for exceptional candidates (e.g., top-20 university, publications, or press). If applicable, please mention how you meet these O-1 criteria in your application.

Tech stack

  • LLMs: OpenAI, Anthropic
  • ML: LightGBM, Prophet
  • Backend: Python, Postgres
  • Frontend: React, TypeScript
  • Infrastructure: AWS

🚀 Y Combinator Company Info

Y Combinator Batch: S24
Team Size: 3 employees
Industry: Healthcare -> Healthcare IT
Company Description: AI workforce management for healthcare

💰 Compensation

Salary Range: $130,000 - $200,000
Equity Range: 0.3% - 1.75%

📋 Job Details

Job Type: Full-time
Experience Level: Any (new grads ok)
Engineering Type: Full stack

🎯 Interview Process

1. Interview screen (20 mins) 2. Technical Interview (45min) 3. Take-home technical assignment 4. On-site working session with the team in San Francisco (1 day)