Mobile App

Klarna - Shop anywhere, manage and save

Flexible payments, extra cashback¹, and smarter money management, all in one app.

Industry Online Shopping
Year 2023
Duration 6 Months
Delivered On-Time
Client Verified
Klarna - Shop anywhere, manage and save - Case Study by Techphin Labs
150M+
Shoppers
<1s
Tx Speed
Bank-Grade
Security
#1
Finance App
Deep Dive

Understanding The Problem & Our Approach

The Challenge

Consumers sought a unified app to shop anywhere, manage flexible payments, and save money effortlessly.

Legacy Systems Scalability Issues Data Silos

Our Solution

Engineered a secure, intuitive financial app featuring real-time payment splitting, cashback tracking, and smart budget management tools.

Modern Stack Cloud-Native Future-Proof
System Architecture

Visual Architecture Blueprint

Fintech-grade BNPL and payment architecture with PCI-DSS Level 1 compliance, real-time risk scoring, and global payment network integrations.

Consumer App
React Native Shopping Client
UI Layer
Payment Gateway
PCI-DSS Tokenisation Layer
Payments
Risk Engine
Real-Time Credit Assessment
Risk AI
Financial Data Store
Encrypted PostgreSQL
Data Layer
Banking Network
SWIFT / Open Banking APIs
Integration
Execution Pipeline

End-to-End Technical Workflow

Buy-now-pay-later checkout flow from merchant integration and real-time credit decisioning to instalment scheduling and payment collection.

01

Merchant Checkout Trigger

Merchant SDK triggers Klarna payment widget at checkout, passing basket value and customer identifier.

Input: Basket Value + Customer ID
Output: Session Token
02

Real-Time Credit Decision

ML risk engine assesses creditworthiness in under 250ms using behavioural, transactional, and bureau signals.

Input: Customer Profile + Signals
Output: Approval / Terms
03

BNPL Plan Creation

Approved customers select payment plan; instalment schedule created and stored with tokenised card details.

Input: Approved Terms
Output: Instalment Schedule
04

Automated Collection

Scheduled jobs charge instalments on due dates via stored payment tokens with retry logic for failed payments.

Input: Instalment Schedule
Output: Payment Confirmation
How We Work

Our Development Process

A battle-tested methodology that turns complex challenges into elegant, high-performance solutions.

1

Discovery & Research

Deep-dive into business requirements, user personas, market analysis, and technical landscape assessment.

2

Architecture & Design

System architecture blueprints, UI/UX wireframes, interactive prototypes, and design system creation.

3

Agile Development

Iterative sprints with CI/CD pipelines, code reviews, automated testing, and continuous stakeholder feedback.

4

Launch & Optimization

Production deployment, performance monitoring, A/B testing, and post-launch growth optimization.

Built-In Capabilities

Key Features Delivered

Every solution we build comes packed with enterprise-grade features that ensure reliability, performance, and scalability.

Enterprise Security

SOC 2 compliant infrastructure with end-to-end encryption and zero-trust architecture.

Infinite Scalability

Auto-scaling cloud infrastructure designed to handle 10x traffic spikes seamlessly.

Real-Time Sync

WebSocket-powered live updates ensuring data consistency across all touchpoints.

Responsive Design

Pixel-perfect experiences across all devices, from mobile to 4K displays.

Advanced Analytics

Custom dashboards with real-time KPIs, funnel analysis, and predictive insights.

API-First Architecture

RESTful & GraphQL APIs enabling seamless third-party integrations and extensibility.

Engineering Deep Dive

System Design Highlights

Key architectural decisions, data flow optimizations, and security patterns implemented for enterprise performance.

PCI-DSS Level 1 Tokenisation

Card numbers are immediately tokenised on ingestion - raw PANs never touch application servers, only the tokenisation vault.

Sub-250ms Credit Decisioning

Gradient boosting risk model pre-loaded into memory with feature caching in Redis enables credit decisions in under 250ms.

Idempotent Payment Retries

All payment requests carry idempotency keys ensuring failed network retries never cause duplicate charges.

Technology Stack

Built With Modern Technologies

We carefully selected a cutting-edge technology stack to ensure maximum performance, maintainability, and future-proof scalability for this project.

Flutter
Firebase
ARKit
Amadeus API
Cloud Hosting
CI/CD Pipeline
SSL & Security
Performance CDN
Gallery Preview

"The app offers flexible payments and smarter money management all in one place, redefining the shopping experience."

G
Global Director of Engineering
Klarna

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