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Fiverr Pro
English
$
USD
I will develop robust backend systems in java and node js
freelancer-jimy
About this gig
Need a secure, high-performance backend that won't crash under production loads?
With 15+ years of expertise in software architecture, I build robust, scalable, and production-ready backend systems using Java and Node.js, strictly following Domain-Driven Design (DDD) principles.
What I Deliver:
- High-Performance APIs (Spring Boot, Express, GraphQL)
- Secure Auth & Identity Management (JWT, OAuth2)
- Database Design & Optimization (MySQL, PostgreSQL, MongoDB)
- Microservices & Third-party API Integration
- Performance Tuning, Code Audits & Bug Fixing
Why Work With Me?
- Clean Architecture: 100% maintainable, industry-standard code.
- AI-Augmented Speed: Leveraging Claude/Cursor for faster delivery and rigorous unit testing.
- Enterprise-Grade Quality: Proven track record in large-scale systems.
Message me now to discuss your custom project requirements!
Get to know freelancer-jimy
freelancer-jimy
fullstackengineer
- FromChina
- Member sinceJul 2026
- Avg. response time1 hour
Languages
Chinese, English
Hi, we are freelancer6688, a premium full-stack development studio with nearly two decades of tech experience.
🤖 AI AUTOMATION & n8n
- Custom n8n workflows, AI agents & chatbots
- API integrations & webhooks
- CRM, lead gen & data automation
- Telegram, Slack, Email & Sheets automation
💻 FULL-STACK DEVELOPMENT
- DDD & legacy system refactoring
- Database optimization
- Java backends, Node.js microservices
- React/Next.js frontends
Whether you need intelligent automation or robust enterprise software, we deliver clean, production-ready solutions. Let's build together!
Other Software Development Services I Offer
FAQ
Should I contact you before placing an order?
es, absolutely. Please message me before ordering to discuss your technical requirements, system architecture, and tech stack. This ensures we align perfectly on the project scope and delivery timeline.
What will I receive as the final delivery?
You will receive production-ready, clean, and well-commented source code built on Clean Architecture/DDD principles. For applicable packages, it also includes comprehensive API documentation (Swagger/Postman) and initial setup guides.
Do your packages include cloud hosting or third-party API fees?
No. The buyer is responsible for providing and paying for their own cloud hosting (AWS, Azure, DigitalOcean, etc.) and any necessary third-party subscription fees. I will handle the deployment and configuration on your infrastructure.
How do you use AI tools like Claude or Cursor in development?
I use advanced AI editors exclusively to accelerate boilerplate code writing, auto-generate rigorous unit testing, and perform syntax checks. Every single line of core business logic, database query, and system architecture is hand-crafted and fully verified by myself to ensure enterprise-grade secu
