Fintech · London · GMT

Fintech software development
for London firms.

London moves more financial technology than anywhere in Europe, and financial technology is the least forgiving software there is. A bug in a marketing site costs you a lead. A bug in a payment waterfall costs you a reconciliation project and a conversation with your auditor. We build the second kind of software: money movement, lending, card management and banking integrations, by engineers who have shipped it before.

10 yrs

Longest client relationship

Islam360 - still shipping

25M+

People using software we built

Across 176 countries

19+

Products shipped end to end

Across 8 industries

$1.5B

Exit by a client we engineered for

Tweeq, acquired by Tabby

How we cover London

On London time.

  • UK entity established 2023, based in Welwyn Garden City — roughly 25 minutes from King's Cross.

  • Full working-day overlap with London, so a blocker raised at 09:30 is answered the same morning.

  • On-site in London for kickoff, architecture workshops and quarterly reviews.

  • Engineering delivered from our Lahore HQ, led and accounted for from the UK.

The case for us

Why fintech teams
bring us in.

We have moved real money at scale

We rebuilt the backend of a commercial lending platform from Java to C# on a CQRS architecture, migrated its money movement systems, and delivered more than 61 financial reports. Twelve of our engineers are still embedded on it. We also engineered for Tweeq, acquired by Tabby in a $1.5B deal — Saudi Arabia's first fintech exit.

Audit trails are a design input, not a log file

Financial systems get asked what a balance was on a given date, and why. We build event-sourced ledgers where the audit trail is the system of record rather than something written alongside it, so point-in-time answers and reversals are structural rather than heroic.

Security from the first commit

OWASP practice from line one rather than a hardening pass before launch. Our most recent penetration test on a client platform returned zero vulnerabilities and passed its third-party security review on the first attempt.

We will tell you what not to build

Plenty of fintech scope is regulatory theatre or premature optimisation. We would rather lose the line item than bill you for it, which is why clients stay — our longest relationship runs to ten years.

Capabilities

What we build for
fintech clients.

Lending & loan servicing

Origination, servicing, amortisation, payment waterfalls, participations and the reporting layer that has to agree with all of it.

C# / .NETCQRSEvent sourcingPostgreSQL

Payments & money movement

Collections, payouts, reconciliation and failure handling — including the reversal and retry paths most builds leave until after launch.

StripePlaidUnitMastercard

Card & account management

Issuing workflows, account lifecycle, limits and controls, built against the scheme and PCI requirements that apply to you.

PCI-awareCard issuingKYC flows

Open banking & data aggregation

Account information and payment initiation integrations, with consent handling and token lifecycle treated as first-class rather than an afterthought.

Open BankingPlaidOAuthWebhooks

Regulated reporting

Reports built as derived read models over one event stream, so they agree with each other by construction instead of by vigilance.

ReportingReconciliationBI

Platform rescue & migration

Parallel-run migrations off a legacy stack without interrupting money movement, cut over per portfolio rather than all at once.

MigrationParallel runLegacy

Frequently asked questions

London questions,
answered.

Are you FCA authorised?

No, and you should be wary of an engineering firm that says it is. We are a software studio, not a regulated financial institution or a compliance consultancy. We build to the control requirements your compliance function and advisers define — audit trails, access control, data retention, segregation of duties — and we have delivered systems that then passed external review. Your regulatory permissions remain yours.

Do you have experience with payment waterfalls and participations?

Yes. It is one of the components we are brought in for most often, because it is the part of a lending platform that fails silently. We have written in detail about where waterfall engines break and how we build them to survive partial payments, out-of-order effective dates, reversals and multi-participant rounding.

How do you migrate a live financial platform safely?

Both engines run against live traffic, both results are written, the old one is served, and every difference is investigated until it is zero or explained. Cutover happens per portfolio starting with the simplest structures, and the old path stays switchable for a full reporting cycle rather than a sprint.

What does a fintech build cost in London?

Our senior engineers are a flat monthly rate per engineer, with a 10% reduction across the team at four or more and a dedicated project manager included at that size. Compared with hiring in London, there is no recruitment fee, no employer National Insurance, no pension contribution and two weeks' notice to scale either direction.

Can you work alongside our existing engineering team?

That is the usual arrangement. Our engineers join your standups, your repositories and your review process. You interview them before anyone starts, and the person you interview is the person who writes the code.

Who owns the code and the architecture decisions?

You own the code from the first commit, delivered documented and tested in your repositories. Architecture decisions are made jointly and written down, so the reasoning survives after we step back.

ready when you are

Let's build something
that lasts.