Hire fintech developers who build the audit trail with the feature
Our engineers have shipped a forex trading assistant that executes real broker trades and a tax platform that checks dozens of strategies per profile. Plus held payments for a marketplace. You interview them before anyone starts.
The engineer you are getting
4 things that decide this
- 01Senior engineers only, with money-handling systems already running in production: a trade-execution assistant, a tax-strategy engine, and held marketplace payments.
- 02You interview every engineer before they join. Nobody is assigned to your team from a profile you never saw.
- 03They store money as integers, never floats, and can explain why in one sentence: floating point cannot represent 0.10 exactly, and rounding drift compounds across thousands of transactions.
- 04Every line they write is yours from the first commit, including the reconciliation jobs and the audit trail.
What a fintech developer actually does here
A generalist team can build a fintech feature that looks correct in a demo. The trouble shows up later. A number stops matching what the bank reports, or a regulator asks why a decision was made and nobody can produce the trail.
On Trading CoPilot, we built the loop that turns a TradingView alert into a real trade. Message the trader, wait for a yes or no, then execute through a broker connection and log the result. A missed step there is never just a display error. It places or skips a real trade. On IRS Escape Plan, an AI engine checks more than 50 tax strategies against a user's profile. It reads 1040s, K-1s, and 1099s to verify figures like Section 199A QBI, because the output is a filed position. On WorkMateAI, an Australian trades marketplace, payments sit in escrow until a job is confirmed. They freeze automatically on a dispute, and the evidence a chargeback case needs gets built alongside the freeze.
Three different products, one repeated requirement: the system has to be able to show its work.
What they take off your roadmap
Money stored as integers
Amounts in the smallest currency unit, never a float, so a sum of a million transactions still matches the bank to the cent.
Authorization separated from settlement
A hold is not a charge. Engineers who track both states know exactly when money actually moves, and when a request has only succeeded.
Reconciliation as a product feature
A scheduled job that checks your ledger against the bank or processor and surfaces a break the same day, not the next audit.
An audit trail designed in, not bolted on
Every decision and every state change logged with who, what, and when, because reconstructing it after the fact is where most fintech incidents get expensive.
- Scoping callFree. What you need built
- ShortlistEngineers matched to the work
- You interviewYour process, your bar
- EmbedYour repo, standups, tools
- ReviewSwap if the fit is wrong
The interview is yours. A marketplace that assigns a vetted profile skips the step that predicts fit.
Money-handling systems, in production
How hiring works
- 01
Tell us what is stuck
A free call about the money movement or the decision logic you need built, and where the regulatory exposure actually sits.
- 02
Meet the engineers
We shortlist people who have shipped a comparable money-handling system, and you interview them. Say no and we go back to the shortlist.
- 03
They embed
Your repo, your standups, your ticket system. One engineer owns the money-handling logic and is named as accountable for it.
- 04
They hand over
Reconciliation jobs, the audit trail, and documentation, plus someone on your team trained to run it. The first 2 months of support and maintenance are free, with every build.
Stack
Money handling
Data and infrastructure
Integrations
Tell us what the system needs to prove
Bring the part that worries you: a reconciliation that never quite matches, a decision that needs to be defensible later, or money that has to move between two parties correctly the first time. The scoping call is free, and you will leave it knowing what kind of build this actually is.
01How is this different from a generalist agency or a freelancer?
You get an engineer who has already shipped a money-handling system to production, not one learning the rounding and reconciliation problems on your codebase. We are also accountable if something breaks. A freelancer you found yourself leaves the hiring risk with you.
02What if the work turns out to need deeper regulatory or compliance knowledge than expected?
That surfaces on the scoping call, not after you have committed. We describe what the requirement actually demands and how we build to it, so you know the shape of the work before anyone starts.
03A payment issue or a reconciliation break cannot wait a day. Can we reach the engineer fast?
Yes. We fix a daily overlap with your hours before anyone starts, so standups and pairing happen while both sides are awake. Money problems get treated as urgent, not queued behind whatever else is running that week.
04Who owns the reconciliation logic and the audit trail?
All of it is yours from the first commit. That includes the reconciliation jobs, the audit logging, and any document-intelligence pipeline built around them.
05What actually drives the cost of a fintech build?
How many parties the money touches, and how defensible the decision trail has to be. A single-party ledger is quick. A system that holds funds for someone else, or has to justify a decision to a regulator later, is a different scope. Scoping calls are free. Where we have to get into an existing codebase before answering, a paid two-week diagnostic produces a fixed price rather than a guess.
Read next
- fintech software development, by vertical →The constraints that make financial software different, and where we have built inside them.
- why floats break money math →The rounding problem, and what to store instead.
- us owning your payments integration outright →Us building the integration, past the hire alone.
- what reconciliation means →The definition, and why skipping it costs you weeks later.
- held payments for an Australian trades marketplace →Escrow, disputes, and chargeback evidence in production.
