The mission
We're replacing the knowledge worker
Accounting is a $700B+ industry still run on manual processes and human judgement. We're building the leading AI-native platform to replace it; a fleet of 20+ AI agents running in production today, automating what used to require entire teams. Humans stay in the loop only when it genuinely matters. We are not building a tool. We are replacing the knowledge worker.
The team
People who love to build
A top-performing, highly ambitious group working together in our London office. These things matter to us:
Agency
Everyone owns and prioritises their own work. No asking for permission.
Product obsession
We redefine workflows from first principles; opinionated, and aiming for simplicity.
Everyone codes
Everyone ships. We deploy to production 30-40 times a day.
High-velocity
Rapid experimentation, lean autonomous teams, and minimal bureaucracy.
AI first
We use AI to move faster with higher-quality results, across every part of the business.
Excellence
We hold ourselves to the highest standard in everything we ship. Good enough is never enough.
The role
What you'll own
Own and ship core product end-to-end
You set the bar, define the solution, and put it in production. No hand-offs, no waiting for sign-off.
Make high-leverage architectural decisions
Define a category-leading platform at real scale. Your decisions will have lasting impact.
Build and push the boundaries of our AI agent fleet
20+ agents in production and rapidly growing. You'll be at the frontier of what's possible.
Work directly with customers
Understand the real problem, not a distilled brief. You'll shape the product from first-hand insight.
Genuine ownership from day one
No ticket queues, no hand-offs, no waiting for permission. Just you and the problem.
Who you are
About you
You have a track record of outperforming your peers; whether that's a first from a top university, a scholarship, a hackathon win, a national ranking in sport or chess, or simply being the best at whatever you set your mind to.
You thrive in fast-paced environments; you've worked at a high-growth startup, built something yourself, have founding experience, want to become a founder — or simply love being in a startup environment.
You are self-motivated and thrive in a high-agency environment.
You are impatient and bias heavily towards shipping.
You want maximum responsibility and ownership from day one.
You hold yourself to a high technical bar and care deeply about the craft.
You are very curious and a fast learner, comfortable moving across the stack.
Perks
Benefits
Competitive salary + founding team equity
25 days holiday
MacBook provided
Free team lunch every Friday
Weekly team sport social
Annual offsite; last year, Mallorca
Further reading
Resources
Our culture
A company is just a group of people. Briefcase is a group of people that are naive enough to think we will change the world.
Building autopilot
Probabilistic AI agents paired with deterministic formal verification create the perfect combination for high trust domains like finance and accounting.
Building Tax-Aware AI
When an AI agent classifies a transaction's VAT treatment, it shouldn't be guessing—it should cite the exact HMRC guidance it relied on.
Cursor x Briefcase: FinTech London Hackathon
150 developers. One evening. Build AI-powered fintech tools with Cursor; hosted by Briefcase and White Circle at Halkin, London.
lu.ma/2ohizf10 ↗
Join us
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