Founding Product Engineer at Briefcase

Jack & Jill/External ATS • london, england • Posted June 18, 2026

About the Role

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

  • Founding team equity and influence provide significant financial upside and the chance to shape the company's core culture and technical DNA.
  • You will push the frontier of financial services by building industry-leading AI agents within a product-obsessed, high-velocity engineering environment.
  • Direct collaboration with founders on a system of records platf...