Skip to content
East Wolf
Industries — Financial Services

Financial
services.

Infrastructure for money and data. We build the data platforms, billing systems and integrations that banks, fintechs and subscription businesses run on.

An engineering studio — not a regulated entity. We hold no licences and we do not handle funds
§ 01What we build here01 / 03

Systems that
have to add up.

Three kinds of work sit under this heading: banking data, fintech data, and the billing side of subscription commerce. They share one property — someone downstream has to reconcile the output against money that actually moved.

01

Banking data platforms

Pipelines and models over core banking data: ingestion, normalisation, and reporting a finance team can read without a translator.
02

Fintech data engineering

The data layer a fintech product runs on — event capture, transaction models, and the batch and streaming jobs that keep them current.
03

Billing and subscriptions

Recurring billing, plans and price changes, proration, renewals, dunning, invoices, and the states an account moves between.
04

Provider integration

Connecting products to payment, billing and banking providers. We write the integration and reconcile the records; the provider moves the money.
05

Reconciliation and reporting

Turning transaction records into figures someone is willing to sign: matched, explained, and traceable back to the source row.
06

Back-office consoles

Admin tooling for finance and operations — the screens that fix a bad record, refund a charge, or explain why a number moved.
Note

The projects behind this page are real; the write-ups are not published yet. Rather than post a case study we cannot evidence, we will walk through the relevant work on a call and put you in front of the engineer who built it.

§ 02How it is engineered02 / 03

Correctness
before speed.

Most software can absorb a wrong row. Financial software cannot — the error leaves the system, lands in a statement or a ledger, and someone has to explain it. That single constraint decides most of the architecture.

Retries must not double-charge

Every write that touches money is idempotent, keyed, and safe to replay. Networks fail mid-request in every system; here the failure has to be recoverable rather than expensive.

History is appended, not edited

Prices, plans and rates change. Records are effective-dated so last quarter still reports what it reported at the time, and a correction is a new entry rather than a quiet overwrite.

Every figure has a lineage

A number on a dashboard should be traceable to the rows that produced it. We build that path deliberately, because the first hard question about a report is always where it came from.

Nothing fails silently

Jobs that skip a file, feeds that arrive short, totals that stop matching — these surface as alerts with the failing record attached, not as a gap someone notices at month end.

Least privilege on real data

Access is scoped, secrets are held outside the codebase, and lower environments run on masked or synthetic data. Designed to your controls and your auditors — we hold no certifications of our own.

It has to fit what exists

This sector rarely starts from zero. The work is usually alongside a core system, an ERP and a provider contract that are all staying, which makes integration the engineering, not the afterthought.
§ 03Start here03 / 03

Start with
one system.

Twenty years, 100+ projects delivered, 95% retention. A small senior team, with a network of 50+ engineers behind it.

Bring us the part that is causing trouble — a billing run that needs rebuilding, a data platform that cannot answer the question finance keeps asking, an integration that has to be right every time. We will tell you how we would build it, how long it takes, and what it costs. If we are the wrong studio for it, we will say so.

Start a conversationhello@east-wolf.com
Bucharest, Romania
Back to Home