Founding Engineer - Abacus

The role

The Founding Engineer will own and expand the core machine learning engine. You will lead development of the ML-powered document extraction engine and architect backend systems.

What you will 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
• 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

Required qualifications

• 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 have

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

Benefits

• Significant equity
• Top-tier health insurance
• daily lunches
• an in-office barista

About the company

Abacus is building AI agents that automate tedious, repetitive workflows for accounting firms. The company is backed by top-tier investors and works with large enterprise clients.