In fintech, a UI bug is a trust incident, not a ticket. That changes how you plan, budget, and build. This guide covers what drives cost and what to get right early.
Ranges are planning figures, not quotes. Licensing and legal costs are separate and vary by region.
Planning ranges
| Product | Example | Timeline | Planning range (USD) |
|---|---|---|---|
| Focused MVP | Savings goals, wallet, or budgeting | 4–6 months | $80k–$180k |
| Full product | KYC, payments, ledger, notifications, admin | 6–10 months | $180k–$400k |
| Regulated platform | Lending, trading, or multi-region payments | 9–18 months | $400k+ |
Core features every fintech app needs
- Identity and KYC with a verification provider.
- A ledger that is correct by construction, with double-entry logic and reconciliation.
- Payments through a provider, with retries and failure handling.
- Notifications for transactions and security events.
- Admin tooling for support, disputes, and audit.
Engineering decisions that matter most
- Idempotent transactions. Retried requests must never double-charge.
- Audit logs in the data model. Every balance change should be explainable.
- Reconciliation. Your records and your provider's records must agree, and mismatches must be visible.
- Precision. Store money as integers or decimals, never floats.
- Security. Strong auth, device binding, encryption, and rate limiting on sensitive endpoints.
Compliance overview
Requirements depend on what you do and where. Common ones include KYC and AML checks, PCI DSS if you touch card data, and SOC 2 for enterprise customers. Working with a licensed partner can shorten the path. Confirm specifics with counsel.
Web, mobile, or both?
Users of consumer fintech expect a native experience, with biometrics and push. Our Ferra case study shows a savings product moving from web to native and lifting mobile signup completion by 34%. See also our guide to mobile app development cost.
Reduce risk, not just cost
- Discovery before build, especially around edge cases like failed transfers and disputes.
- Test the ledger harder than the UI.
- Launch to a small cohort before opening the doors.
FAQ
How long does compliance take? It runs in parallel with the build. Start early because partner onboarding often has the longest lead times.
Can we add AI features? Yes, with audit trails on every model call. See AI integration cost.
Building in this space? Explore our fintech software development experience, or contact us.
