Building a FinTech app means navigating PCI-DSS, KYC/AML, open banking APIs, and secure architecture — before writing a single feature. Here's everything you need to know.
FinTech is one of the most rewarding — and most technically demanding — verticals we build in. The combination of regulatory requirements, real-money transactions, and the expectation of zero downtime means every architectural decision carries outsized risk. Get it right and you have a defensible, scalable business. Get it wrong and you're liable.
Start with Compliance, Not Features
Most founders want to jump straight to the product. But FinTech compliance is non-negotiable and retroactively expensive. Before your first line of code, identify which regulations apply to your product: PCI-DSS for card payments, KYC/AML for account opening, GDPR/CCPA for user data, and FCA/RBI/CBUAE licensing if you're processing payments directly.
Core Architecture Components
- Identity & KYC: Integration with Onfido, Jumio, or Sumsub for document verification
- Payment Processing: Stripe, Adyen, or regional processors depending on markets
- Open Banking: Plaid (US), TrueLayer (UK/EU), or Salt Edge for bank account linking
- Fraud Detection: Sift, Sardine, or custom ML models for transaction monitoring
- Encryption: AES-256 at rest, TLS 1.3 in transit, HSM for key management
- Audit Logging: Immutable event logs for every sensitive operation
Cost Breakdown by Product Type
| Product Type | MVP Cost | Full Build Cost | Timeline |
|---|---|---|---|
| Digital Wallet | $40,000–$70,000 | $100,000–$180,000 | 4–8 months |
| Lending Platform | $60,000–$90,000 | $150,000–$250,000 | 6–10 months |
| Investment/Trading App | $80,000–$120,000 | $200,000–$350,000 | 8–14 months |
| Payment Gateway | $50,000–$80,000 | $120,000–$200,000 | 5–9 months |
| Crypto Exchange | $70,000–$100,000 | $200,000–$400,000 | 8–16 months |
First Code Technologies has delivered 20+ FinTech products including digital wallets, lending platforms, and crypto exchanges. Our compliance-first approach means we help you structure your architecture to meet regulatory requirements from day one — not as an afterthought.
Arjun Mehta
Head of Product, First Code Technologies
Published February 3, 2026
