Building FinTech Products That Stay Secure as They Scale
Trading platforms, e-signature services and payment flows share the same failure modes. The security practices and architecture choices that protect financial products without slowing delivery.
By David Kukharchuk
Tech Lead at Mirko
Security is an architecture property
Financial products do not become secure through a final audit. They become secure through decisions made in the first weeks: how identities are verified, where sensitive data lives, how every change is logged and who can see what.
Practices we apply by default
The baseline
- Multifactor identification, including biometric face and voice verification with liveness checks where documents are signed.
- Role-based access control and audit logs for every action that touches money or records.
- Encrypted storage and transport, secrets in a vault, no credentials in code.
- Rate limiting and abuse protection on public endpoints.
- Automated tests for the flows that move value, run on every deployment.
Privacy by design
In Web3 finance, zero-knowledge protocols keep transfers private by default while still proving they are valid. In traditional products the same principle applies: collect the minimum, expose the minimum and make access reviewable.
A secure e-signature service, a trading community with thousands of active users and privacy protocols for financial transactions were built on these rules. None of them slowed delivery; all of them survived growth.
