You will get a high-concurrency payment transaction API with idempotency protection
Project details
I will build a production-ready payment transaction API designed for high-concurrency environments.
This backend service includes idempotency protection to prevent duplicate charges, Redis caching for performance, and PostgreSQL storage for reliable transaction persistence. The system is designed to safely process financial operations even under heavy load.
The API follows clean backend architecture and production-ready practices such as request fingerprinting, database constraints, and safe retry handling.
This type of system is commonly used in fintech platforms, SaaS billing services, ecommerce checkout systems, and digital wallet infrastructures.
This backend service includes idempotency protection to prevent duplicate charges, Redis caching for performance, and PostgreSQL storage for reliable transaction persistence. The system is designed to safely process financial operations even under heavy load.
The API follows clean backend architecture and production-ready practices such as request fingerprinting, database constraints, and safe retry handling.
This type of system is commonly used in fintech platforms, SaaS billing services, ecommerce checkout systems, and digital wallet infrastructures.
Programming Languages
Python, Java, GoCoding Expertise
Performance Optimization, SecurityWhat's included
| Service Tiers |
Starter
$300
|
Standard
$700
|
Advanced
$1,500
|
|---|---|---|---|
| Delivery Time | 6 days | 8 days | 10 days |
Number of Revisions | 1 | 2 | 3 |
Number of Pages | 1 | 2 | 3 |
Design Customization | - | - | - |
Content Upload | - | - | - |
Responsive Design | - | - | - |
Source Code |
Frequently asked questions
About Y
Senior Backend Engineer | AI Automation | Python | Spring Boot | Micro
Ho Chi Minh City, Vietnam - 6:56 am local time
Struggling with slow APIs, production bugs, or backend systems that are hard to scale? I help SaaS and fintech teams build stable, scalable backend platforms using Spring Boot, Python, and clean architecture principles.
With 15+ years of experience in SaaS and digital banking, I design production-ready APIs, microservices, and automation pipelines focused on reliability, performance, and maintainability — not just code that “works”, but systems that scale in real production environments.
Core expertise:
• Java 17, Spring Boot 3.x
• REST APIs & Microservices Architecture
• PostgreSQL (schema design, indexing, query optimization)
• Redis (caching strategies, performance tuning)
• Kafka (event-driven systems)
• Python automation pipelines
• Web scraping & LLM-powered data processing
• Docker, AWS
• CI/CD pipelines & TDD
I work best with teams that need:
• Performance optimization
• Backend refactoring
• Microservices architecture design
• AI automation systems and data pipelines
• Long-term backend ownership
Clear communication. Clean architecture. Production-ready systems.
Steps for completing your project
After purchasing the project, send requirements so Y can start the project.
Delivery time starts when Y receives requirements from you.
Y works on your project following the steps below.
Revisions may occur after the delivery date.
Requirement analysis
Review your application architecture, payment provider, and expected transaction volume before starting implementation.
API development
Implement the payment transaction API with idempotency protection, Redis caching, and PostgreSQL transaction storage.