How to Build a Fintech App: A 2026 Walk-Through

TL;DR: Building a fintech app starts with defining your regulatory scope (KYC, AML, PCI DSS), mapping your data model around core entities like Users, Accounts, and Transactions, and connecting specialized APIs for payments, identity, and fraud detection. AI can generate your app foundation fast, but security testing and compliance review remain non-negotiable before real money moves through it.

You have an idea for a fintech app that solves a real problem. The challenge is that fintech apps handle real money and regulated data, which means security, compliance, and data integrity shape every decision from day one.

None of that rules out building one yourself. AI tools can put together a first draft of your app in minutes, giving you a starting point to build from. Specialized APIs can take on complex payment, identity, and fraud workflows, but you still need to design and document your compliance responsibilities.

In this guide, you’ll learn how to define your niche and regulatory scope, map the features and data model for your app type, connect payments and identity verification APIs, test and secure before launch, and ship to web and native mobile — all on Bubble and without a dev team.

What is fintech app development?

“Fintech” is short for financial technology: software that lets people manage, move, or make decisions about money digitally. Fintech app development means building secure digital platforms for financial services (like mobile banking, digital wallets, and wealth management) on web or mobile. Strict regulatory compliance is built in from the start.

Building a fintech app is different from building a typical consumer app. It involves regulated data, like identity documents, account numbers, and transaction history. And real money moves through it, which brings legal obligations that vary by country and app type. A fintech app can’t launch loose and tighten privacy later, like a social app might. Exposed balances or credentials on day one can end the business before it starts.

What types of fintech apps can you build?

Before you start building, identify which category your idea falls into. Each type has different compliance requirements, core features, and data models, so picking the right category early shapes every decision that follows.

• Digital wallet: Stores payment credentials and enables peer-to-peer transfers, QR code payments, and account top-ups. Examples include PayPal and Cash App.
• Mobile banking app: Provides account management, transaction history, and card controls like freezing a card or setting spending limits. Neobanks such as Revolut and N26 are common examples of mobile-first banking apps.
• Personal finance app: Aggregates accounts from multiple banks, categorizes spending automatically, and surfaces budgeting insights. Examples include YNAB and Credit Karma’s Mint successor experience.
• Lending app: Manages loan applications, underwriting inputs like income verification, disbursement of funds, and repayment schedules. Examples include LendingClub and Affirm.
• Investment app: Handles account opening, risk profiling questionnaires, order flow for buying and selling securities, and portfolio tracking. Examples include Robinhood and Betterment.
• Insurance app (InsurTech): Digitizes policy management, claims submission, and underwriting processes. Examples include Lemonade and Oscar Health.
• RegTech app: Helps businesses automate compliance monitoring, regulatory reporting, and audit trails. These are typically sold business-to-business rather than to consumers.

The type you choose determines which features you need and which regulations apply. We’ll cover both in the next two sections.

Step 1: Define your niche, users, and regulatory scope

This is the first step in the development process. “Niche” in fintech means two things: the specific problem you solve and the specific user you solve it for. Get specific here, because your niche shapes everything that follows, including which regulations apply to you.

Nail down three things before touching any tool or API:

• Your core user and their critical job: Identify who they are (consumers, gig workers, small businesses, merchants) and the one financial task they need to complete. For example, “freelancers who need to send invoices and get paid in multiple currencies” is a tighter brief than “people who need financial tools.” The more specific you are, the easier it becomes to identify which features matter and which regulations apply.
• Your launch market and money movement pattern: Your launch market is the country or countries you start in, since regulations differ by country (a US-based wallet faces different rules than a UK one). Your money movement pattern is how money actually moves through your app: by card, bank transfer (ACH in the US, SEPA in Europe), or payouts to other accounts. Both shape your compliance requirements. If you handle card data directly, PCI DSS rules apply, though using a processor like Stripe can reduce how much of that responsibility falls on you.
• Your compliance scope from day one: The three most common regulatory frameworks are KYC (Know Your Customer, identity verification to prevent fraud), AML (Anti-Money Laundering, monitoring for suspicious activity), and PCI DSS (Payment Card Industry Data Security Standard, rules for handling card data). Know which apply to your app type before designing any feature. A personal finance app that only reads account data has lighter requirements than a lending app that disburses real money.

Step 2: Map your must-have features and data model

Now that you have a niche and regulatory scope, translate that into a concrete feature set and data structure. Start with your data model instead of your screens: The types of records your app stores and how they relate is the foundation everything else is built on.

Core features by app type

Rather than listing every possible fintech feature, organize them by app type so you can focus on what’s relevant to you.

The data model every fintech app needs

A data model is the set of record types your app stores and how they connect. For example, a User has an Account, an Account has Transactions, and each Transaction has a status and an amount. Getting this right early prevents costly rebuilds later.

Here’s the data model every fintech app needs, built from the core entities that show up across almost every type:

• User: Stores identity information, contact details, and KYC status — the central record everything else connects to. This is where you track whether a user has passed identity verification and what permissions they have.
• Account: Represents a balance or financial position. A user may have multiple accounts, for example a spending account and a savings account. Each account tracks its current balance and links to the instruments (payment methods) that fund it.
• Instrument: A payment method linked to the account, such as a debit card, bank account, or virtual card. This is where you store tokenized payment credentials (never store raw card numbers) and track which instrument was used for each transaction.
• Transaction: An append-only record of every money movement, including amount, direction (inbound or outbound), status (pending, completed, failed), timestamp, and reason code. Append-only means you never delete or overwrite transactions; you only add new ones, which creates an audit trail.
• Limit: Rules governing how much a user can send, receive, or withdraw, enforced at the workflow level to prevent fraud or regulatory violations. For example, a new user might have a $500 daily send limit that increases after they complete additional verification.
• Document: KYC-related files like ID scans or proof of address, stored securely with access restricted to compliance roles. These files need encryption at rest and strict privacy rules so only authorized admins can view them.
• Audit log: An immutable record of admin actions and system events, required for compliance and dispute resolution. Every time an admin views a user’s data, approves a transaction, or changes a limit, that action gets logged with a timestamp and reason.

Once you have your features and data model, the next step is choosing the APIs that handle the parts you shouldn’t build from scratch: payments, identity verification, and fraud detection.

Step 3: Choose your payments, KYC, and fraud APIs

Fintech apps are not built entirely from scratch. They rely on specialized third-party APIs (application programming interfaces, meaning software connectors) for the most regulated and complex functions. Choosing the right vendors early is one of the most important decisions a fintech builder makes.

Payment processing and bank data APIs

Payment APIs handle the actual movement of money so you don’t have to manage banking relationships directly.

• Stripe: A widely used option for card payments, ACH transfers, and payouts, with extensive first-party documentation and PCI Level 1 compliance.
• Adyen: Built for scale and global reach. Better suited to apps that need to process payments across many countries from day one. Adyen supports a broad range of local payment methods and multi-currency setups; confirm currency-conversion behavior and configuration for your specific implementation.
• GoCardless: Specializes in direct debit and recurring bank-to-bank payments. A strong fit for subscription-based lending or utility-style fintech apps where users pay the same amount monthly.
• Plaid / Tink / TrueLayer: Open banking APIs that let users securely link their bank accounts. Used for balance verification, income verification, and account-to-account transfers. Coverage varies by region, so verify that your target market is supported before committing.

KYC and identity verification APIs

KYC is the process of verifying that a user is who they say they are, typically through document scanning and liveness detection (a selfie video that proves the person is present). Building this in-house is both technically complex and legally risky, so most fintech apps use a dedicated KYC vendor.

• Veriff: Covers a wide range of countries and document types, and returns structured verification results. Check which decision fields, reason codes, and appeal data your specific plan actually gives you access to.
• Onfido (now part of Entrust): Entrust acquired Onfido in 2024, and its document verification, biometric checks, and fraud-detection signals are now part of Entrust’s identity security portfolio. You can pull results through a dashboard, SDK, or API. Check which structured fields you’ll actually get before you design risk-based routing around them.
• Persona: Lets you adjust verification friction based on risk, using features like Dynamic Flow. You set the thresholds (lighter checks for low-value sends, stricter ones for high-value withdrawals) based on your own compliance policy.
• Sumsub: Combines KYC, KYB (Know Your Business, verification for company accounts), and AML monitoring in one platform, a practical choice if your app serves both consumers and businesses since you can verify people and companies through the same integration.

When comparing vendors, look at document coverage, supported countries, liveness quality, webhook reliability, and how decisions get returned to you. Machine-readable reason codes matter most for appeals and audit trails.

Fraud detection APIs

Fraud detection sits on top of payments and KYC. It monitors behavior patterns in real time to flag or block suspicious activity. Most payment processors include basic fraud rules, but dedicated fraud tools add behavioral signals like device fingerprinting and velocity checks (how many transactions a user attempts in a short window).

• Stripe Radar: Built into Stripe’s payment flow. Uses machine learning to score transactions and lets you add custom rules like “block transactions over $1,000 from new accounts.”
• Sift: A standalone fraud platform with products for payment fraud, account defense/account takeover, content integrity, and dispute management. Useful when you want signals beyond just the payment moment, for example flagging users who create multiple accounts from the same device.
• Sardine: Designed specifically for fintech. Supports KYC onboarding orchestration, device and behavioral signals, consortium risk data, transaction monitoring, and AML workflows. Confirm the exact provider integrations and cross-referencing logic for your implementation.

Step 4: Build your MVP without a dev team

You can build a fintech MVP without a dev team. Some regulated workflows will still need a technical, security, or compliance specialist to sign off, but on Bubble, the core build doesn’t require an engineering team.

Your MVP doesn’t need every feature on your roadmap. It needs just enough to validate your core assumption with real users: typically onboarding, KYC, one funding method, a balance display, and transaction history.

Generate your UI, database, and workflows with AI

Bubble AI generates a working visual foundation from a plain-language description. Describe your app (for example, “a digital wallet where users can sign up, verify their identity, top up via card, and send money to other users”), and it scaffolds the UI, data model, workflows, and logic for you to inspect and refine in the editor. For native mobile, the AI generator is in beta and doesn’t build workflows yet. You’ll need to add those yourself; the Bubble AI Agent (beta) can walk you through the steps.

Bubble AI also generates privacy rules automatically for sensitive data types, giving PII fields a safer starting point (though you should still review them against your actual compliance needs). You can switch between AI prompting and direct editing anytime. Bubble AI keeps your UI, database, and workflows visible the whole time, so you always know how your app works.

Connect KYC, payments, and dashboards

Once you’ve generated your scaffold, connect your chosen APIs. This is where the vendor decisions from Step 3 pay off.

• KYC integration: Set up API calls to your chosen KYC vendor (Veriff, Onfido, etc.) and store the result (pass/fail status and reason code) against the User record. Time the KYC check to when verification is actually needed, not at signup by default. You might let users browse your app first, then trigger it at their first transaction.
• Payment integration: Use your chosen payment API to initiate card top-ups or ACH/bank transfers. Then update your Transaction records as webhooks come in with status changes. Webhooks are notifications your payment processor sends when something changes, for example when a pending transaction completes or fails.
• Dashboards and limits: Build balance displays, transaction history views, and limit enforcement into your visual workflows. Log declines and flag events that exceed thresholds for manual review. For example, if a user attempts to send more than their daily limit, your workflow should decline the transaction, log the attempt, and optionally notify your compliance team.

Bubble’s visual workflow builder lets you see exactly what happens at each step. For example, a workflow like “when a top-up webhook arrives, update the Account balance, create a Transaction record, and send a push notification” is fully visual. You can inspect, understand, and edit it directly, without writing backend code.

Ship to web and native mobile from one editor

Most fintech users expect a mobile app, not just a web app. Building separate web and mobile codebases doubles the maintenance burden, so a single editor that outputs both from a shared backend is a significant advantage for a small team.

You can build native iOS and Android apps in the same Bubble editor as your web app, sharing the same database and backend logic. Over-the-air (OTA) updates let you push text changes, UI tweaks, and some bug fixes without resubmitting to the app store, though not every change qualifies, so check before you rely on it. And you can test on real devices during development, before you submit to any store.

That covers building and shipping your MVP. Before it can handle real money, it still needs to clear security and compliance checks.

Step 5: Test and secure your app before launch

Launching a fintech app without security and compliance review is a legal and reputational risk, not just a technical one. This section covers what to check before going live.

Run security scans and enforce privacy rules

Privacy rules are row-level and field-level permissions that control which users can read or write which data.

Make sure personally identifiable information, like names, addresses, and ID documents, is only visible to the user it belongs to and to admins who actually need access, not to every user. Keep your API keys and tokens out of public workflows and frontend expressions. And make sure your audit log captures admin actions with timestamps and reason codes.

Bubble’s security dashboard (available on paid plans) can check most of this for you: exposed credentials, missing privacy rules, and unsafe API setups. Higher-tier plans unlock deeper checks, like compromised API tokens and unprotected backend workflows. Treat the dashboard as a helpful second pair of eyes, not a substitute for a fintech-specific security review.

Complete user acceptance testing and penetration testing

User acceptance testing (UAT) means running your app end-to-end as a real user would, covering both the happy path (everything works) and failure cases (KYC fails, payment declines, network errors). Penetration testing is a security review where a tester attempts to exploit vulnerabilities in your app.

Test the key flows end to end: KYC pass and fail, top-up success and decline, transfers between users, withdrawals, and disputes. Pay extra attention to webhooks, since payment APIs don’t always deliver them in order. Try simulating retries, out-of-order events, and duplicate deliveries to see how your app handles them.

Many banks, processors, and enterprise partners expect an outside security review before they’ll work with you, so budget for a penetration test even at MVP stage. Check what your jurisdiction and partners specifically require.

Cost and timeline for fintech app development

Costs vary widely, and two things drive most of that variation. The first is complexity and compliance scope: A personal finance app that just aggregates data needs far less legal review, API work, and testing than a lending app that disburses real money. The second is how you build. Traditional code teams mean higher upfront costs and longer timelines. AI-powered visual development cuts both, generating your scaffolding quickly and needing a smaller engineering team for most MVP features.

Building on Bubble can cut down the engineering time and cost involved, since AI and visual editing make building far quicker. Compliance work doesn’t get faster, though; legal review, vendor setup, and security testing take the time they take, regardless of how you build.

Start building your fintech app

You now know your niche, your regulatory scope, your data model, and the APIs you need to connect. From there, it’s building your MVP and testing and securing it before launch. That’s what it takes to build a fintech app that can actually handle real money.

Ready to build it? Bubble AI turns your plan into a working app foundation in minutes, and you can chat with the Agent to add features or troubleshoot as you go. Unlike tools that leave you stuck with code you can’t read, everything in Bubble stays visual, so you can keep building (and stay compliant) without decoding a single line.

Frequently asked questions

What is fintech app development?

Fintech app development is the process of building secure digital platforms that deliver financial services through a mobile or web app. It differs from standard app development because it involves regulated data, real money movement, and legal compliance requirements that vary by country and app type.

How much does it cost to build a fintech app?

Cost depends on your app type, compliance scope, and development approach. A personal finance app with lighter compliance requirements costs significantly less to build than a lending or investing app that involves regulated money movement. Using AI-powered visual development with pre-built API integrations reduces both cost and time to MVP compared to hiring a traditional engineering team.

Can AI build a fintech app?

Bubble AI can generate a visual app foundation quickly from a plain-language description, and Bubble’s editor lets you inspect and refine the UI, database structure, privacy rules, and workflows directly instead of being stuck with code you can’t maintain. You still need to connect regulated functions like KYC and payments through purpose-built third-party APIs, and you need to complete security and compliance review before launch.

How do you build a fintech MVP without a dev team?

Use an AI-powered visual builder to generate your app’s structure, connect KYC and payment APIs through guided integrations, enforce privacy rules on your data model, and run security scans before launch. This can help a non-technical founder build and test a working MVP foundation without writing backend code, while still involving compliance, legal, security, or technical experts for regulated launch requirements.

What regulations apply to fintech app development?

Common fintech obligations can include KYC/identity verification, AML and sanctions monitoring, PCI DSS for card data, privacy laws such as GDPR/CCPA and financial privacy rules such as GLBA, plus category-specific rules such as Truth in Lending for credit, securities regulations for brokerage or advisory products, HIPAA/PHI rules for health-insurance contexts, and FDIC/SIPC disclosures where applicable. Which ones apply to your app depends on your app type, the countries you operate in, and whether you handle card data directly.