We're building the firm behind the firm.

Cranston is a team of engineers and accountants in San Francisco. We build AI that runs the back office for CPA firms: tax prep, bookkeeping, and the client follow-up in between. Some firms run our software with their own staff; others hand us the work entirely.

One of us builds the AI. The other ran the firm.

Cranston started with the two of us. It's the back office Max wanted when he was doing this work by hand.

Sean O'Bannon, Co-founder & CEO at Cranston

Sean O'Bannon

Co-founder & CEO

Builds the AI

Sean runs engineering and product. He did AI research at Stanford, left the master's program to build, and worked on automation at Databricks and ReMatter. He started Cranston to take the prep, chasing, and cleanup work off accountants' plates.

Max Minsker, Co-founder & COO at Cranston

Max Minsker

Co-founder & COO

Ran the firm

Max started and ran his own accounting firm, then spent a decade as a COO inside tech companies running ops and finance. He has done the work Cranston automates, which is why he decides what we build.

Why we built Cranston

Max watched his firm lose its best hours to data entry, chasing clients for documents, and cleaning up offshore handoffs.

None of that work needed a CPA. It needed a system. So we built one: agents that do the prep and the chasing, and leave the judgment calls to a licensed reviewer.

Today Cranston is a team across engineering and accounting: people who have shipped AI systems at places like Databricks and Stanford working with people who have spent their careers closing books. CPA firms run real client work through Cranston every day.

We want firms to take on more clients without taking on more headcount, and to spend their time on the work clients actually pay them for.

Work with us

We're hiring engineers and accountants.

We're in San Francisco, building with AI agents from day one. The team is small enough that what you ship reaches firms the same week, and experienced enough that the bar stays high. If you like hard problems in tax, bookkeeping, and firm operations, we want to meet you.

Or email jobs@cranston.ai

See Cranston in action

Book a 15-minute demo. Bring one firm workflow and we'll show what Cranston can automate, operate, and leave in reviewer control.