Upwork home
Sign up
Project Catalog
DesignDesign
Video & AudioVideo & Audio
Development & ITDevelopment & IT
MarketingMarketing
Writing & TranslationWriting & Translation
MoreMore

You will get Java Backend API & System Development

Xuyang W.Status: Offline
Xuyang W. Xuyang W.
Preview image

Let a pro handle the details

Buy Web Application Programming services from Xuyang, priced and ready to go.
Xuyang W.Status: Offline
Xuyang W. Xuyang W.
Preview image

Let a pro handle the details

Buy Web Application Programming services from Xuyang, priced and ready to go.

Project details

I’m a senior Java backend developer with over 14 years of experience in building and maintaining enterprise-level systems, including a 5000-user OA platform.

I specialize in high-performance REST API development using Spring Boot, with deep expertise in database design, query optimization, and security hardening. Every project includes clean, well-documented code, unit tests, and 30 days of post-delivery support to ensure your system runs smoothly.

Whether you need simple API integration or complex enterprise features, I’ll deliver reliable, scalable solutions tailored to your business needs.
Programming Languages
JavaScript, Java, Go
Coding Expertise
Performance Optimization, Security
What's included
Service Tiers Starter
$150
Standard
$300
Advanced
$500
Delivery Time 3 days 5 days 7 days
Number of Revisions
123
Design Customization
-
-
-
Content Upload
-
-
-
Responsive Design
-
-
-
Source Code

Frequently asked questions

Xuyang W.Status: Offline

About Xuyang

Xuyang W.Status: Offline
Java Backend Developer | Web3 & Blockchain | Spring Boot & API
Yuncheng, China - 6:43 am local time
With more than 14 years of experience as a Java backend developer, I specialize in building reliable, scalable, and secure server-side applications for both traditional businesses and Web3 projects.

My core technical stack includes Java, Spring Boot, RESTful APIs, MySQL, Redis, Kafka, and Go. I have designed and implemented large-scale enterprise systems, and recently expanded into Web3 development, working on blockchain data parsing, smart contract integration, and risk monitoring tools.

I value clean code, clear communication, and on-time delivery. Whether you need help with backend development, API integration, or blockchain-related projects, I’m here to provide high-quality solutions tailored to your needs.

Steps for completing your project

After purchasing the project, send requirements so Xuyang can start the project.

Delivery time starts when Xuyang receives requirements from you.

Xuyang works on your project following the steps below.

Revisions may occur after the delivery date.

Requirement Confirmation & Planning

Confirm project scope, API specs, database design and technical requirements with you.

Development & Unit Testing

Develop the REST APIs, integrate database, write unit tests and ensure code quality.

Review the work, release payment, and leave feedback to Xuyang.