Hire the Best Java Developers
in China

Upwork: 100% Job Success Score with positive client feedback. I am a senior full-stack engineer with 10 years of professional experience. I build complete web applications, business websites, and backend systems with a strong focus on reliability, clean structure, and maintainable code. I recently built and deployed a complete WordPress website for a local service business, including a responsive homepage, service pages, pricing page, reviews page, blog layout, FAQ section, contact flow, SSL setup, and basic speed/SEO optimization. This project demonstrates my ability to build a real business website from structure to deployment, not just edit a template. My core backend experience is Java and Spring Boot. I have engineered and maintained production systems for banking clients, working on clean data handling, SQL optimization, REST APIs, and reliable, well-tested business logic. I also build backends with Node.js and work comfortably with MySQL, PostgreSQL, MongoDB, and API integrations. On the frontend, I build production interfaces with React, Next.js, and TypeScript. Because I work across the full stack, I can take a feature from database to API to UI, or step into an existing codebase and quickly understand what needs to be fixed or improved. I have also built AI agent systems, including AgentRoute Studio, an open-source goal-driven agent platform with verification layers, multi-model routing, risk gates, and budget monitoring. If you are integrating LLM features and want them to be reliable rather than just a quick demo, I can help with that too. I am based in China and work comfortably with English and Japanese-speaking clients in writing. I spent years collaborating with Japanese teams, so I understand the importance of clear updates, careful implementation, and dependable follow-through. I care about clear communication, realistic estimates, and delivering work that I would be comfortable maintaining myself. Tell me what you are building, and I will tell you honestly how I would approach it and whether I am the right fit.

I'm a skilled Java developer with 7+ years of experience and a Bachelor's degree in Computer Science., specializing in Java, Python, and JavaScript.I have been tech leader in the last two companies. My expertise is in Backend/Frontend development, Restful API, Web Scraping & Crawling, Devops. ➢ Strong Programming skills, in designing and implementing scalable applications using Spring Boot, Spring MVC, Java-J2EE, Nodejs, Express, Struts, Spring Data JPA, JPA, Hibernate, Spring Securit, Rabbitmq, etc. ➢ Database: MySQL, PostgreSQL, Redis, MongoDB, ClickHouse. ➢ Familiar with SQL, can do performance tuning and riched experience in database design. ➢ CI/CD: Jenkins/Gitlab CI/CD/ Github Action. ➢ DevOps: Linux, Ansible, Docker, Kubernetes. ➢ Extensive experience in working with JavaScript/TypeScript languages, frameworks, libraries, and technologies such as Vue.js/ React, NextJS, Tailwind, ShadCN. ➢ Familiar with Web Scraping and automation using Python or JS. My clients' happiness is always my top concern. I'll be looking for a communication from you.:)

Hello, I am Yixu Chen, an AI/ML developer since 2012, when I was told to diagnose the malfunctions of machines using some ML algorithms on a course. I became a software developer when I graduated in 2015, with a Master's Degree. Since then I have done several projects where AI/ML algorithms were applied: * Recommendation of departments for patients in an online-medication app * Grouping of news articles by their similarity using NLP for an exchange * A code extraction tool extracting code from screenshots for myself * Information extraction from invoices for a big group * Information extraction from ID pictures for an investing App * Recommendation of portfolios for the investing App As the development of LLMs in recent years, I began developing AI agents as the requirement of my clients, from which I have gained a lot of experience leveraging AI. The projects I have done so far were in many different industries, including freelancing platforms, children education, KOL and real estate, typically, giving me solid experience in them, and I hope my experience will be the help you need in your project.

Java Developer & Automation Specialist (FinTech Background) I combine strong backend skills with financial literacy (MPAcc degree). I build secure systems and automation tools that save you time. Core Tech: Java, Spring Boot, Python, VBA, and SQL Security: Expert in identifying and fixing vulnerabilities like SQL Injection & XSS. Automation: Custom scripts to automate Excel/Word tasks and financial data processing.

I'm a professional Java Developer with 5+ years of enterprise-level development experience, currently working as a full-time Java Engineer at Weavers (Fanwei), China's leading OA system manufacturer. My core services: ✅ OA system secondary development & customization ✅ Java application development with Spring Boot/Spring Cloud ✅ Java code debugging, bug fixing & code review ✅ Java homework/assignment tutoring for students & beginners ✅ Simple Java tool/console/GUI program development ✅ RESTful API development & third-party service integration Core tech stack: Java, Spring Boot, Spring Cloud, MyBatis, MySQL, Redis, Elasticsearch, Linux, Git, Docker, Vue. I guarantee 100% on-time delivery, clean well-commented code, and 2-hour quick response to all messages. Whether you need a small bug fix or a full enterprise application development, I will give you the best service. Send me a message with your project details, I will get back to you with a customized solution right away!

I’m a developer experienced in building websites for small and medium-sized businesses. Whether you’re trying to win work, list your services, or create a new online store, I can help. Knows HTML and CSS3, Java, jQuery and High concurrency Full project management from start to finish Regular communication is important to me, so let’s keep in touch.