Founding Product Engineer at Briefcase

Company: Jack & Jill/External ATS

Location: London

Posted: March 31st, 2026

Job Title

Founding Product Engineer

Company Description

Briefcase - AI-driven system of record automating accounting workflows

Job Description

Join as a founding engineer to build a next-generation system of record that leverages custom AI agents and a bespoke data platform. You will redefine manual accounting workflows from the ground up, working directly with the founders to ship fast, iterate on customer feedback, and own high-impact projects from conception to delivery.

Location

London, UK

Why this role is remarkable

What you will do

The ideal candidate

Next steps

Step 1. Visit our website.

Step 2. Click 'Talk to Jack'.

Step 3. Talk to Jack so he can understand your experience and ambitions.

Step 4. Jack will make sure Jill (the AI agent working for the company) considers you for this role.

Step 5. If Jill thinks you're a great fit and her client wants to meet you, they will make the introduction.

Step 6. If not, Jack will find you excellent alternatives. All for free.

We never post fake jobs

This isn't a trick. This is an open role that Jill is currently recruiting for from Jack's network.

Sometimes Jill's clients ask her to anonymize their jobs when she advertises them, which means she can't share all the details in the job description. We appreciate this can make them look a bit suspect, but there isn't much we can do about it.

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