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FINTECH SOFTWARE DEVELOPMENT.

Invoicing, payments, reconciliation and tax software, built by the team that runs two live finance products of its own: ereQa and Owoode.

What does fintech software development involve?

Fintech software moves or records money, so it needs accurate ledgers, reliable payment integrations, reconciliation, audit trails and strong security, and it must respect financial rules such as PCI DSS for card data and, in the UK, FCA authorisation where regulated activity is involved. ruxox builds on licensed payment providers rather than holding funds, and has two finance products live: ereQa and Owoode.

Scope a fintech build →

Finance products we run

ProductMarketWhat it does
ereQaNigeriaInvoicing and recurring billing, WhatsApp payment links (transfer, card, USSD), expenses, bank reconciliation, e-sign contracts, client portal, AI monthly reviews
OwoodeNigeria, with UK and Ireland sectionsThirteen free invoicing and tax tools, including VAT, PAYE and withholding-tax calculators updated for the Nigeria Tax Act 2025

What we build

  • Invoicing and billing: quotes to invoices, recurring billing, credit notes, multi-currency.
  • Payments through licensed providers: cards, bank transfer, payment links and, in Nigeria, USSD.
  • Reconciliation: matching bank statements to invoices and bills automatically.
  • Tax calculation: VAT, PAYE and withholding tax encoded as rules you can update.
  • Reporting: P&L, cash flow and exports an accountant will accept.
  • Internal finance tools that replace spreadsheets and manual copying.

Compliance we design around

RuleWhat it means for the build
PCI DSSCard data never touches your servers; payments run through a certified provider
FCA authorisation (UK)If the product holds funds or provides regulated services, you need authorisation or a licensed partner; we build on licensed providers
UK GDPR / Nigeria Data Protection Act 2023Financial and personal data minimised, encrypted and retained only as long as needed
Making Tax Digital (UK VAT)VAT records kept digitally, with exports suitable for compatible filing software

We are not a regulated firm and do not give legal or regulatory advice; we design the software so that your compliance obligations are easy to meet, and say plainly in the scope where you need specialist sign-off.

Engineering for money

  • Money as integers, never floating point, with currency stored alongside every amount.
  • Idempotent payment handling, so a retried webhook never charges or records twice.
  • Audit trails on every change to a financial record.
  • Reconciliation reports that flag mismatches for a person rather than guessing.

Cost

Most fintech builds sit in our Platform Build tier, £15,000–£60,000+, because of integrations, audit trails and testing. A focused tool such as a calculator suite or internal invoicing app can fit a Product Build at £5,000–£15,000. Try the free VAT calculator to see the kind of tool we build.

FAQ

Common questions

Do you build fintech apps in the UK and Nigeria?

Yes. ruxox is based in the UK and Nigeria and runs two finance products, ereQa and Owoode, for Nigerian businesses, with UK and Ireland tax sections on Owoode.

Do I need FCA authorisation for my fintech app?

Only if your product carries out regulated activity, such as holding customer funds or providing payment services. Many products avoid this by using licensed payment providers. Take specialist advice before launch; we design the software around whichever route you choose.

How do you handle card payments securely?

Card data goes straight to a PCI DSS certified payment provider and never touches your servers. Your system stores only references and payment status.

How much does fintech software development cost?

Most fintech builds cost £15,000–£60,000+ in the Platform Build tier; focused tools can fit a Product Build at £5,000–£15,000. All prices are fixed in a written scope before work starts.

Can you integrate Nigerian payment methods like USSD?

Yes. ereQa takes payment by transfer, card and USSD through established Nigerian payment providers, matched back to invoices automatically.

Work with us

Building a fintech product?

Send us a plain-English brief. You get a written scope, the riskiest part named honestly, and a fixed price within 48 hours.

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/ Topics
fintech software developmentfinancial software development companypayments integrationinvoicing softwarereconciliation
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