The problemYour Stripe payouts never match the bank, and month-end takes a week of spreadsheets.
In shortFinancial software development is building billing, payment, ledger, reconciliation and reporting systems so the numbers tie without spreadsheets. We are a financial software development company working for SaaS businesses, marketplaces and fintech startups, on licensed providers like Stripe and Plaid, synced to QuickBooks or Xero. Focused tools start at $15,000 and take 10–20 weeks; full products are quoted from $40,000.
One bank deposit covers forty Stripe sales, minus fees and refunds, and someone has to work out which ones. The connector leaves the fees out, so the books are wrong until a person fixes them. Month-end becomes three CSV exports stitched together in a spreadsheet that freezes halfway through the lookups, and most of the week goes on proving that a difference is expected.
Financial software is ordinary software with one unforgiving rule: the numbers have to be right every time, and you have to be able to prove how they got there. We build billing systems, payment flows, ledgers, reconciliation tools and financial reporting on licensed providers such as Stripe and Plaid, so payouts tie to the bank, fees land in the right account and a retry cannot charge anyone twice.
Maintained by Haider Ali, Founder & CEO · Updated
These are the problems finance teams and founders bring to us most. Each one is a software problem with a known fix.
One deposit covers dozens of sales minus fees and refunds. Booking the net amount understates income and never records the fees, so the P&L is wrong.
What we doWe break every payout into gross sales, fees, refunds and disputes through a clearing account, so each deposit ties to its bank line automatically.
Someone keys fees in by hand, and when a payment lands in one month and its payout in the next, bank and balance-sheet closing balances drift apart.
What we doWe post fees and timing differences explicitly, with month-end cut-off handled in the sync, so closing balances agree without manual journals.
The close takes days, the same summaries are rebuilt every month, and real errors hide among timing noise such as partial captures and payouts that cross month-end.
What we doWe automate the matching and show only the exceptions, each with a reason, so finance reviews ten lines instead of ten thousand.
Refunds, support tickets, chargeback risk and lost trust. Stripe delivers webhooks at least once, not exactly once, so duplicates are normal and the code must expect them.
What we doWe put idempotency keys on every payment request and process each webhook event once, so a retry or a repeated event cannot charge someone twice.
Floating-point math turns an amount like $33.80 into a long decimal, so a payment call fails or a cent quietly disappears, and invoices never quite reconcile.
What we doWe store amounts as whole cents with the currency beside them, write the rounding rules down, and test every calculation, including refunds of partial refunds.
Under-billing, invoice disputes, and engineers bolting on workarounds for credits or per-model rates instead of building the product.
What we doWe build a usage ledger and pricing logic that rate events your way, then hand the final amounts to Stripe Billing to invoice and collect.
We would rather tell you now than take the project and disappoint you.
| Starts from | $15,000 for a focused tool; full fintech products quoted from $40,000 |
|---|---|
| Typical timeline | 10–20 weeks |
| Best for | SaaS companies, marketplaces and online businesses taking money through Stripe, and fintech startups |
| Not for | Holding funds, lending or issuing cards without a licensed partner |
| Common first build | Stripe to QuickBooks or Xero reconciliation, or usage-based billing |
| Built on | Stripe, Stripe Connect, Plaid, and the QuickBooks Online and Xero APIs |
| Compliance | Card data stays with Stripe. This is not a PCI audit or a SOC 2 report |
| What you own | The code, the ledger data and the hosting account |
Worth knowing: The cheapest way to stay out of regulatory trouble is to never touch what you do not need. Card details entered into Stripe's hosted fields keep you in the smallest PCI scope; identity checks run by a provider keep sensitive documents out of your database. Good financial software is often defined by what it deliberately never stores.
Amounts stored as whole numbers in the smallest currency unit, the currency kept with every amount, and rounding rules written down instead of left to floating point.
Double-entry records where every movement has a matching entry, so any balance can be rebuilt from history.
Idempotency keys on every payment request and webhook, so a retry or a repeated event is recognized and skipped.
Payments, payouts, bank lines and invoices matched automatically, with exceptions sent to a person instead of buried.
Unmatched lines go to a review queue. AI can suggest a match or a category, but a person approves it, and nothing posts to the ledger unreviewed.
An append-only log of who changed what and when, which is the first thing auditors and acquirers ask for.
Revenue, deferred revenue, payouts and fees calculated from the ledger, with exports your accountant can use.
A 22-second look at the work: money handled in whole cents, payments that a retry cannot charge twice, a real ledger and reconciliation. From $15,000, 10–20 weeks.
Your Stripe payouts never match the bank deposits. Month-end close takes days. A retry charged the customer twice. Totals come out a cent off. There’s a better way. Financial software that reconciles itself, to the cent. A real ledger. Retries that cannot charge twice. Reconciliation with an audit trail. From $15,000 · 10–20 weeks · fixed quote. Get a fixed quote. pixelandoak.com/services/financial-software-development
Stripe pays out in batches. One deposit can cover dozens of charges, minus Stripe's fees, refunds and disputes, and it can land days after the sales it contains. If you book the deposit as one sale, income is understated and fees never appear. The fix works the same way in QuickBooks or Xero:
At low volume, a connector does this well and costs far less than a build. Custom software makes sense when volume is high, you run a marketplace with Connect payouts, you have several entities or currencies, or your pricing is unusual.
Most businesses should start with an off-the-shelf tool. This is roughly where each option fits and where it starts to strain:
| Option | Fits when | Cost shape | Where it strains |
|---|---|---|---|
| Native Stripe app for QuickBooks or Xero | Low volume, one entity, simple pricing | Free or a small monthly fee | Fees and timing differences often need manual fixes |
| Connector such as Synder, or A2X for Shopify and Amazon | Moderate volume, standard sales and refunds | A monthly fee that grows with volume | Marketplaces, several entities, unusual money flows |
| Stripe Billing as it comes | Seat or tiered pricing, simple usage | A percentage of billed volume | Credits, per-model rates and complex usage rules |
| Custom reconciliation or billing on Stripe | High volume, marketplaces, several entities or unusual pricing | From $15,000 fixed per phase, then hosting | Someone has to maintain it, so budget for support |
We are not a bank, a money transmitter, a law firm or a compliance auditor, and we do not pretend to be. Holding customer money, lending and issuing cards all require a license or a regulated partner. If your app holds or moves other people's money, you may need state money transmitter licenses, which take months. Most startups avoid that by building on a licensed provider such as Stripe Connect or a banking-as-a-service partner. Get legal advice on licensing before the build, not after.
We also do not build core banking systems, trading engines, crypto exchanges or automated lending decisions. Those need specialist teams and regulators involved from day one.
Licensed providers for moving money, and boring, strict technology for recording it.
Stripe, Stripe Connect and Billing, PayPal
Plaid
QuickBooks Online and Xero APIs
Node.js and TypeScript, Postgres with strict constraints
SQL, scheduled jobs, CSV and PDF exports
Role-based access, audit logs, encrypted backups
Vercel or Cloudflare, in your account, not ours
Automated tests on every calculation, including refunds and edge cases
Not sure whether custom financial software is what you actually need? Send over what you are trying to fix and we will tell you straight — including if a smaller job would do it.
Ask us first →Every flow of money and every number the business reports, written down with where it comes from.
A fixed price per phase, with the riskiest flow built and tested first.
Calculations checked against worked examples your finance team agrees with before anything ships.
The new system runs beside the old process until a full cycle reconciles to the cent.
AI agents from our Engineering, Quality & Security and Design & Film divisions do the work, in parallel. Haider Ali, founder and CEO, agrees the plan with you and signs off everything before it reaches you.
Real work that uses the same skills. Every card links to something you can open and inspect yourself.
Billing, recipe-based stock, rider cash settlement and shift close for restaurants. Runs every day at a restaurant in Karachi.
Headless ShopifyA Next.js store with a towel designer. Every order reaches Shopify as a draft order through the Admin API, with live carrier shipping rates.
Focused tools such as a billing engine, a Stripe reconciliation system or a reporting pipeline start at $15,000. We quote full fintech products from $40,000, built in phases with a fixed price on each. The price depends on how many money flows, integrations and entities are involved, plus data migration and ledger complexity.
Ten to twenty weeks for a focused tool such as reconciliation or billing. After that, the new system runs beside your old process until a full month reconciles to the cent, so you switch over on evidence rather than hope.
Because Stripe pays out in batches, net of fees, refunds and disputes, and often days after the sales. One deposit can cover dozens of charges. Recording sales at gross in a clearing account, fees as an expense, and matching each payout to its deposit makes the numbers tie.
Yes. Both have apps that bring Stripe transactions into the books, and connectors such as Synder go further. They suit low and moderate volume. Custom work makes sense when fees, timing differences, marketplace payouts or several entities keep needing manual fixes every month.
Use a connector if your volume is moderate and your money flows are standard; it is far cheaper. Build when you run a marketplace, several entities or currencies, unusual pricing, or when the connector still leaves hours of manual fixes each month. We will tell you which side you are on.
Record every billable event in your own usage ledger, rate it with your pricing rules, then send the final amounts to Stripe Billing to invoice and collect. Keeping the ledger yourself lets you price credits or per-model rates your way and show customers exactly what they were charged for.
We design so card details never touch your servers, using Stripe's hosted payment fields or checkout. For most setups that means the shortest PCI self-assessment, SAQ A, which also asks you to confirm your payment page is protected from script attacks. The attestation is yours to sign. We are not a PCI assessor, and this is not an audit.
Possibly, if your app holds or moves other people's money. Licenses are issued state by state and take months. Most startups avoid needing one by building on a licensed provider such as Stripe Connect or a banking-as-a-service partner. We are not lawyers, so get licensing advice before the build.
You do. The code lives in your repository, and the ledger, database and hosting run in your own accounts, not ours. Any developer who knows TypeScript and Postgres can maintain it, and we document the money flows so your accountant and auditors can follow them.
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