Founding Engineer – Remote (Ab-Intel)

Salary Range: 180k to $240k

We are looking for a Founding Engineer with 2-7 years of experienceto help build AI agents that automate tax preparation for the largest accounting firms in the US. Abacus is profitable, has passed seven figures in revenue in under a year, and is live in 11 of the top 100 firms. We want a high-bar generalist who makes sharp backend decisions and wants to help scale a product that customers already pay for.

Responsibilities

• Build the core tax-automation platform as a generalist: mostly backend, with some frontend
• Help ship the next major version of the product, a big relaunch planned for early next year
• Make backend architecture decisions on your own, working closely with the CTO and Head of Engineering
• Build our LLM and OCR agent pipelines and turn what firms tell us into product
• Work on new products in tax and in other accounting workflows, such as audit

Key Requirements

• Strong Python skills; TypeScript is a strong plus
• Hands-on experience making backend architecture decisions
• Experience at a venture-backed, fast-growing startup (Seed through Series B) is strongly preferred; long tenures at big tech or slow enterprises are a negative signal
• CS degree strongly preferred (Math or Physics also considered) from a top-50 US school, ideally with a strong GPA
• A builder mindset with high ownership and urgency; side projects and 0-to-1 work are a plus

Work experience

• Experience building 0 to 1 at early-​stage,​ venture-​backed startups (Seed to Series B,​ Y Combinator) or as a founding engineer
• Proficiency in Python and TypeScript
• 2 -​ 7 years of experience as a software engineer
• Has owned features from design to production
• Experience shipping LLM or agent-​based features to production
• Owned backend architecture decisions (classic systems,​ with LLM features on top)

Nice-to-have

• Experience with document extraction or data pipelines at scale

Education

• CS or related technical degree from a Top 50 US university

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