Correctness is the product. Everything else is packaging.
Ledger-accurate systems, hardened infrastructure, and audit readiness for teams moving other people's money.
In financial software the tolerance for approximate behaviour is zero. A duplicate webhook cannot become a duplicate charge, a tenant boundary cannot be enforced in the browser, and a reconciliation break cannot be discovered by a customer. We engineer for that standard and document it well enough to survive an audit.
The four things fintech teams tell us first.
If none of these describe you, we are probably not the right call. If two or more do, the conversation is usually worth fifteen minutes.
Enterprise deals stall on the security questionnaire
Six weeks disappear into a spreadsheet of controls because the evidence has never been collected in one place.
Reconciliation breaks are found by customers
Ledger and provider records drift without an automated check, so discrepancies surface as complaints rather than alerts.
Retries create duplicate financial events
Webhook and payment paths lack idempotency, so a provider retry becomes a double charge or a double payout.
Authorisation is not enforced at the API
Tenant isolation is checked in the interface, which means the data is one crafted request away from the wrong customer.
What we build for fintech teams.
Each of these maps to one of our four practices, so the same team carries it from architecture through to production.
Idempotent transaction and ledger design
Double-entry modelling, idempotency keys on every money-moving path, and automated reconciliation that alerts on breaks the same day they occur.
Security hardening and audit readiness
Threat modelling, server-side authorisation with cross-tenant regression tests, secret rotation, SBOM generation, and the evidence pack that answers questionnaires in days.
Document and identity automation
Onboarding document extraction and verification support with confidence scoring and full human review, feeding your existing compliance decisioning rather than replacing it.
Operational and reporting automation
Scheduled reconciliation, regulatory reporting packs, and exception queues that route to the right person with the failing record attached.
Systems we already integrate with
And the ones we do not, we read the documentation for. Integration risk is priced during the architecture sprint, never discovered halfway through a build.
A comparable engagement, in detail.
How working with us actually goes.
No discovery phase that bills for six weeks and produces a slide deck. You get a plan with a number attached in the first week, and something running in the second.
- 01
Discovery call
15 minutesYou describe the problem. We ask the four or five questions that determine the approach, and tell you on the call whether this is something we should build.
- 02
Architecture sprint
5 working daysA fixed-fee week that produces the system design, the risk register, a phased plan, and a real number. You own the document either way, and it credits against the build.
- 03
Build in weekly slices
3 to 14 weeksEvery Friday there is something in staging you can click. Types at the boundaries, tests on the paths that matter, and a changelog you can read without us in the room.
- 04
Handover or embed
OngoingArchitecture walkthrough, runbooks, and onboarding docs for whoever inherits it. Or we stay on as your engineering function. Both are fine outcomes.
Fintech questions, answered
We handle the technical controls and the evidence behind them — access management, encryption, logging, change management, recovery testing. We work alongside your compliance platform or auditor, who owns the certification itself.
Yes, and we assume that constraint by default. Changes go out behind flags with a rehearsed rollback, and anything touching money-movement paths ships with tests written before the change.
Other industries we work in
Let us look at your fintech systems.
Two ways to start, both of them short. Bring the problem, not a specification — the first useful thing we do is tell you what we would build and roughly what it costs.
Book an architecture call
Fifteen minutes, no deck. We map your problem to an approach and tell you what a realistic scope and budget look like.
- A specific technical recommendation
- A budget band you can plan against
- An honest answer if we are the wrong fit
Send a written brief
Prefer to write it down? Email us the shape of the problem and we will reply with a first take, usually under 12 hours.
- Goes straight to an engineer, not a sales inbox
- We reply with an approach, not a brochure
- Attach anything: repos, docs, screenshots