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Mobile App Development

Fintech App Development Services

Fintech App Development

Quecko builds custom fintech and digital banking applications engineered for performance, compliance, and absolute security. From mobile wallet systems and payment gateway integrations to real-time transaction processing, biometric authentication, and compliance auditing, we build apps that protect your capital and earn user trust.

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400+clients across 20+ countries
$300M+in funds generated
250+products built
150+engineers worldwide
400+clients across 20+ countries
$300M+in funds generated
250+products built
150+engineers worldwide
400+clients across 20+ countries
$300M+in funds generated
250+products built
150+engineers worldwide
400+clients across 20+ countries
$300M+in funds generated
250+products built
150+engineers worldwide
What We Build

Comprehensive Fintech Mobile Engineering

01

Bank-Grade Authentication & MFA

Implementing biometric authentication (FaceID, fingerprint), multi-factor verification (SMS/TOTP), and dynamic JWT session lifecycle handling.

02

PCI-DSS Compliant Payment Integrations

Secure integration with Stripe, Adyen, and regional processors. We utilize tokenization to keep mobile apps out of raw card data scope.

03

KYC & Identity Verification Pipelines

Automating user onboarding and identity checks by integrating with verification partners (Jumio, Persona, Onfido) using custom native camera capture.

04

Double-Entry Transaction Ledgers

Architecting immutable database models for transaction histories, ensuring audit trails are accurate down to the smallest decimal place.

05

Real-Time Data Streams & APIs

Implementing WebSockets and gRPC endpoints to serve real-time exchange rates, stock feeds, and balance updates without lag.

06

Hardware-Level Enclave Encryption

Saving local application tokens, private keys, and user details in the hardware secure enclaves (Apple Keychain, Android Keystore).

The Challenge

In fintech, a single security vulnerability or calculation error can be fatal.

Developing digital finance applications is a high-stakes engineering endeavor. You aren't just managing user data; you are managing active capital, transaction ledgers, and identity verification pipelines (KYC). Building an app with latency, memory leaks, or unencrypted storage risks customer funds and invites heavy regulatory penalties. Off-the-shelf software and low-code builders cannot meet the strict security, audit trail, and performance requirements of the finance sector. Quecko builds bespoke fintech apps from the ground up, utilizing native or optimized cross-platform architectures, encrypted local storage, bank-grade authentication, and real-time transaction reconciliation.

Execution Blueprint

From Day 1 to Day 120: What Fintech Execution Looks Like

01Day 1–15

Discovery & Compliance

Mapping payment flows, defining identity validation processes, designing ledgers, and outlining compliance parameters.

02Day 16–45

Ledger & Security Build

Creating secure transactional APIs, setting up secure local storage enclaves, and building core database schemas.

03Day 46–90

Mobile Build & Integrations

Engineering user dashboards, connecting payment gateways, integrating biometric auth, and binding KYC APIs.

04Day 91–120

Audit, QA & Release

Third-party penetration testing, functional data checks, stress testing under transaction loads, and store deployment.

Technology

Technologies We Master

Tools, frameworks, and protocols we use to build secure and scalable solutions.

Mobile Client

Swift (iOS)Swift (iOS)
Kotlin (Android)Kotlin (Android)
FlutterFlutter
React NativeReact Native

Security & Storage

SQLCipherSQLCipher
Realm Encrypted DatabaseRealm Encrypted Database
Android KeystoreAndroid Keystore
Apple KeychainApple Keychain

Integrations

Plaid (bank login)Plaid (bank login)
Jumio/Persona (KYC)Jumio/Persona (KYC)
Stripe/Adyen SDKsStripe/Adyen SDKs

Backend & Ledgers

Node.jsNode.js
GoGo
Python (Django)Python (Django)
PostgreSQL (strict ACID compliance)PostgreSQL (strict ACID compliance)

APIs & Streaming

RESTREST
GraphQLGraphQL
WebSocketsWebSockets
gRPCgRPC

Infrastructure

AWSAWS
KubernetesKubernetes
Cloudflare (WAF & DDoS protection)Cloudflare (WAF & DDoS protection)
Our Edge

We Build Financial Systems That Keep Capital Secure.

We build apps that isolate sensitive card data and keys. We utilize platform-specific secure enclaves to prevent data exposure.

Security-First Architecture

We build apps that isolate sensitive card data and keys. We utilize platform-specific secure enclaves to prevent data exposure.

Transactional Precision

Our backend ledgers use strict double-entry accounting models. We implement database-level locks to prevent transaction collisions.

Integration Fluency

We have deep experience integrating with financial infrastructure—Plaid for bank linkings, Stripe for card captures, and Onfido for automated ID verifications.

250+ Products Shipped

We bring structural engineering and security standards from blockchain systems directly to enterprise fintech applications.

Our Work

Our Projects

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Social Proof

“With hard work, determination, and an amazing team at Quecko, we can overcome any obstacle and achieve anything we set our minds to.”

Mateen O Dawood

Stable33 Protocol
Engagement

How We Collaborate

Dedicated Fintech Pod

Full-time mobile security developers, ledger architects, frontend engineers, and compliance QA maintaining your application.

Project-Based Platform Build

Fixed-scope development of your fintech app, from compliance planning to final App Store deployment.

Fintech Integration & Security Audit

Standalone consulting to implement secure Plaid, Stripe, or Jumio APIs, audit data compliance, or encrypt local files.

FAQ

Frequently Asked Questions

We use payment SDKs (like Stripe or Adyen) that handle card input via secure tokenization. The card data goes directly from the user's input fields to the payment processor's servers. Our mobile client and backend only receive a secure token, ensuring we do not store, process, or transmit raw credit card details.

We implement jailbreak and root detection at app startup, preventing execution if the OS has been compromised. All local cached data is encrypted using SQLCipher with keys generated inside hardware enclaves that require biometric verification to access.

Plaid allows users to securely connect their bank accounts to your app. It handles login verification natively and returns transactional data and account details to your backend securely, without your application needing to see their bank passwords.

Yes. We have deep experience building Web3 systems. We can integrate multi-chain crypto wallets, smart contract interactions, token swaps, and fiat-crypto rails directly alongside traditional fintech systems.

Blogs

Latest Stories from Quecko

Ready to launch a secure, compliant fintech mobile application?

From biometric authentication and Plaid bank linking to PCI-compliant payment flows and encrypted local storage — Quecko builds fintech apps that deliver performance and absolute security.

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