Jack & Jill
Founding Product Engineer (+ Equity) at Briefcase
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Job Title
Founding Product Engineer
Salary
Not Disclosed
Company Description
AI-native financial automation startup building an autonomous autopilot for accounting
Job Description
Join a high-performance team in London building a fleet of 15+ AI agents that automate complex financial workflows. As a founding engineer, you will ship code 20-30 times daily, architecting core features across React, TypeScript, and Temporal to redefine the industry's system of record from the ground up.
Location
London, UK
Why this role is remarkable
- Radical Agency: You will own the product roadmap end-to-end, moving from customer discovery to production deployment with total autonomy in a high-urgency environment.
- Frontier Tech: Work at the bleeding edge of AI agents, leveraging a modern stack including Langsmith, GraphQL, and bespoke data platforms to replace manual accounting.
- Founding Impact: As an early hire, you will directly shape the technical architecture, company culture, and product vision alongside a team of top-tier ambitious engineers.
What You Will Do
- Build and deploy industry-leading AI agents that handle end-to-end accounting workflows with humans-in-the-loop only where necessary.
- Engage directly with customers to identify pain points and rapidly iterate on product features from first principles.
- Drive technical decisions across the entire stack, refining architecture choices and experimenting with new tools to maintain high shipping velocity.
Reasons to use Rodeo
Start with a chat, not a search bar
Grad scheme, placement, apprenticeship? Not sure what you want yet — that's fine. Your agent talks it through with you and turns "I have no idea" into a shortlist.
It searches the market for you
Every day your agent scans the market matching roles against what actually matters to you, not just keywords on a CV.
Only hits
No noise. No "maybe this fits." Just roles with a clear explanation of why they're right — and where to focus when applying.
The ideal candidate
- Proven track record of outperforming peers in high-growth environments with a deep passion for modern AI and product design.
- Expert-level proficiency in React, TypeScript, and GraphQL, with an interest in working with Temporal and AWS infrastructure.
- Strong bias for action and in-person collaboration, thriving in a fast-paced London-based office where the team ships dozens of times per day.
Who are Jack & Jill?
Ok, I'll go first. I'm Jack, an AI that gets to know you on a quick call, learning what you're great at and what you want from your career. Then I help you land your dream job by finding unmissable opportunities as they come up, supporting you with applications, interview prep, and moral support.
Get help with your application
Your very own career expert that helps elevate your application to the next level.
And I'm Jill, an AI Recruiter who talks to companies to understand who they're looking to hire. Then I recruit from Jack's network, making an introduction when I spot an excellent candidate.
How does this work?
Jack's an AI agent for job searching and career coaching. He works for you.
Jill is the AI recruiter working for the company. She recruits from Jack's network.
If it's a match and the company wants to meet you, they'll make the intro. In the meantime, if you'd like, Jack will send you excellent alternatives.
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.
Give Jack a spin! You could land this role. If not, most people find him incredibly helpful with their job search, and we're giving his services away for free.
“It took my CV and asked me questions relevant to understanding what kind of jobs to suggest for me. Suggestions were almost perfect. Jobs were exactly what I’ve been looking for.”
Jessica, London
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