You will get integrate payment APIs and mobile wallet workflows
Project details
Need a secure payment API or mobile wallet integration for your fintech product?
I will help you build and improve backend payment workflows, mobile wallet systems, transaction routing, third-party payment APIs, Mastercard/MasterPass QR integration, ISO 8583-related flows, and secure financial data handling.
This service is ideal for fintech apps, wallet platforms, payment products, SaaS billing workflows, and businesses that need reliable backend payment logic.
Services may include payment API integration, wallet backend workflow, transaction validation, sandbox coordination, payment routing, secure API handling, error management, and technical documentation.
I will help you build and improve backend payment workflows, mobile wallet systems, transaction routing, third-party payment APIs, Mastercard/MasterPass QR integration, ISO 8583-related flows, and secure financial data handling.
This service is ideal for fintech apps, wallet platforms, payment products, SaaS billing workflows, and businesses that need reliable backend payment logic.
Services may include payment API integration, wallet backend workflow, transaction validation, sandbox coordination, payment routing, secure API handling, error management, and technical documentation.
What's included
| Service Tiers |
Starter
$10
|
Standard
$15
|
Advanced
$20
|
|---|---|---|---|
| Delivery Time | 1 day | 1 day | 2 days |
Number of Revisions | 1 | 2 | 3 |
Design Customization | - | - | - |
Content Upload | - | - | - |
Responsive Design | - | - | - |
Source Code | - | - | - |
About Ali
Java Backend Developer | Spring Boot | Fintech APIs
Lahore, Pakistan - 12:55 am local time
With 9+ years of backend engineering experience, I build and modernize Java/Spring Boot systems for fintech, payments, insurance workflows, wallets, and enterprise platforms.
Some relevant results include scaling payment processing from 1 TPS to 200 TPS, reducing insurance workflow processing time from 4 - 5 hours to 30 - 40 minutes for 1000+ records, building wallet/payment APIs, working with ISO 8583 integrations, and modernizing legacy platforms into Java-based microservices.
I also help teams automate repetitive work with n8n and connect AI into backend systems in a practical way, with proper validation, audit trails, and human approval where needed.
What I can help with:
➞ Payment, Wallet & Fintech Systems - Payment workflows, MyABL Wallet/payment flow experience, Mastercard/MasterPass QR integration, transaction routing, sandbox coordination, ISO 8583 integrations, third-party payment APIs, and secure financial data handling.
➞ Java Spring Boot Backends - REST APIs, microservices, modular backend architecture, secure business logic, authentication workflows, and production-ready backend systems.
➞ Enterprise Modernization - Insurance workflow modernization, legacy system improvements, requirement grooming, and converting business requirements into automated Java/Spring Boot workflows.
➞ Enterprise & SaaS Workflow Automation - n8n and backend API automation for lead/support workflows, human approval flows, automated notifications, CRM/API integrations, SaaS-ready automation workflows, and backend-connected business process automation.
➞ Real-Time Backend Systems - CiscoJTAPI-style integrations, WebSockets, agent,team monitoring, live updates, backend event handling, and operational system integrations.
➞ Database & Performance - PostgreSQL, MySQL, MSSQL, Firebase, Redis, SQL optimization, query tuning, and backend performance improvements.
➞ AI Integration inside Backend Systems - RAG document assistants, AI ticket triage, structured LLM outputs, validation, audit trails, human review, prompt/model comparison, LLM evaluation workflows, and AI recommendation services.
➞ DevOps & Production Support - Docker, GitLab CI/CD, Jenkins, GitHub Actions, deployment workflows, release support, and backend troubleshooting.
Looking for someone to build or improve your Java/Spring Boot backend? I can help with secure APIs, payment workflows, automation, and practical AI integrations. Let’s talk about what you’re building.
Steps for completing your project
After purchasing the project, send requirements so Ali can start the project.
Delivery time starts when Ali receives requirements from you.
Ali works on your project following the steps below.
Revisions may occur after the delivery date.
Review Payment Flow and Build Secure Payment Integration