Fintech Software Development

We build the ledger as an append-only, double-entry system: every transaction posts as balanced debit and credit entries, and nothing gets deleted or edited after the fact, only reversed with a new entry. Idempotency keys on every payment request prevent a retried API call from posting the same transfer twice, which is where most young fintech ledgers first go wrong.

A daily reconciliation job compares your ledger balance against the processor's settlement file and the bank's actual balance, flagging drift the same day rather than at month-end. When a payment fails partway through (authorized but not captured, or captured but not settled), the ledger models that as a distinct state instead of forcing it into 'pending' until someone investigates manually.

We split verification into tiers: a light check (document scan, basic sanctions screening) clears most signups in under a minute, while enhanced due diligence, higher transaction limits or a PEP match routes to a manual review queue with the applicant's evidence already assembled.

Ongoing monitoring runs as a background process against transaction patterns, not just at onboarding, since AML obligations do not end once an account opens. SAR-eligible activity gets flagged with the supporting transaction history attached, so your compliance team is reviewing a case file, not reconstructing one from raw logs.

The cheapest way to pass a PCI DSS assessment is to never hold card data in the first place. We route card capture through the processor's hosted fields or tokenization vault so a card number never reaches your servers, which drops most of the application out of PCI scope and turns a full assessment into a much shorter self-assessment questionnaire.