Founding Engineer - Abacus

The Role

We're hiring a Founding Engineer to own and expand the core machine learning engine behind Abacus. You’ll report directly to the co-founders and work in person from our SF office. This is a rare opportunity to join a high-growth company as an early engineer with massive autonomy and influence over product and technical direction.

In your first 3-6 months, you’ll

• Improve and scale our ML extraction engine using LLMs and OCR
• Own backend architecture and infrastructure decisions
• Build and ship greenfield features to expand the workflows we automate

Over the next year, you'll help lay the groundwork for our engineering org as we scale, while staying hands-on and focused on impact.

What You’ll Do

• Lead development of our ML-powered document extraction engine
• Architect backend systems with performance and scalability in mind
• Build and deploy new automation features for tax firms
• Collaborate closely with the founders on product and user needs
• Help define our engineering culture and technical roadmap

Must-haves

• 1-5 years of experience, ideally in high-ownership or early-stage environments
• Strong backend development skills, particularly in Python
• Proven 0>1 builder (side projects, startup experience, or both)
• Willingness to work from our SF office, 5 days/week
• Willingness to complete a technical take-home exercise as part of the process

Nice-to-haves

• Experience with LLMs, OCR, or data extraction systems
• Exposure to AI infrastructure or evaluation frameworks