Looking for a reliable Java backend expert? I build scalable Spring Boot APIs and microservices, and can deliver complete full-stack features using AI-assisted frontend development.
I am happy to start with a small, low-risk project to prove my skills and ensure a perfect fit.
I Will develop scalable Java Spring Boot APIs and microservices
Development of a single RESTful API endpoint integrated with your database.
- 1 Custom RESTful API Endpoint
- Database Integration (MySQL/PostgreSQL)
- Basic Error Handling & Validation
- Postman Collection for API Testing
- Full Source Code Delivery
A complete Spring Boot microservice with database design and a simple AI-assisted Vue admin panel.
- Complete Spring Boot Microservice (CRUD)
- Database Schema Design & Optimization
- Third-party API Integration (REST/RPC)
- Simple Vue Admin Dashboard (AI-assisted)
- Docker Configuration for Deployment
- Full Source Code Delivery
High-volume data pipeline, microservices architecture, and full-stack delivery.
- High-Volume Data Ingestion (MQTT to Kafka pipeline)
- Microservices Architecture (Spring Cloud / Dubbo)
- Redis Distributed Locks & ShardingSphere Setup
- Complex Third-party Reporting Integration (AES/SHA256)
- Complete Frontend Admin Dashboard (Vue/JS via AI)
- CI/CD & Docker Deployment on Linux
- 30 Days Post-delivery Support
- Full Source Code Delivery
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Value Position
Tech Stack
Data & Messaging
Full-Stack Delivery
Experience Level
What You'll Receive
Full Description
Stop struggling with high-volume data ingestion, complex third-party integrations, or unstable Java backends. I build and rescue mission-critical backend systems that scale reliably in production.
With over 10 years of experience delivering enterprise-grade Java platforms, I have built systems that process real-time telemetry from field devices and sync seamlessly with external regulatory and financial platforms. You get a senior engineer who understands the business impact of system downtime.
What You Will Get (My Core Deliverables):
High-Volume Data Ingestion: End-to-end pipelines (e.g., MQTT/EMQX to Kafka) for real-time telemetry and IoT device data.
Complex Third-Party Integrations: Automated multi-party reporting middleware using XXL-JOB, REST, RPC (OpenFeign, Dubbo), and Spring Cloud Gateway, complete with SHA256/AES encryption.
High-Concurrency Data Handling: ShardingSphere-sharded MySQL with Redis distributed locks, ensuring your system handles massive data retention and concurrent writes without breaking.
Workflow Automation: Custom workflow engines (e.g., Activiti) connecting vehicle terminals, hospital clients, and national reporting platforms.
My Technical Expertise:
Microservices Architecture: Spring Boot, Spring Cloud, Dubbo, Nacos, OpenFeign.
Messaging & Streaming: Kafka, RabbitMQ, MQTT (EMQX), real-time device ingestion.
Data Layer: MySQL, Oracle, ShardingSphere, MongoDB, Redis, SQL tuning, distributed locks.
Reliability & Security: Seata distributed transactions, XXL-JOB scheduling, JWT auth, gateway security.
Delivery & DevOps: Linux, Nginx, Docker.
Full-Stack Capabilities: While I am a backend expert, I leverage modern AI tools and my JavaScript/Vue knowledge to deliver complete frontend admin dashboards and back-office tools. This saves you the cost and coordination headache of hiring a second frontend developer for the admin side.
How We Will Work Together:
Clear Communication: Fluent written English, daily progress updates, and reliable overlap with your timezone.
Outcome-Driven: I own outcomes, not just tickets. I flag risks early and propose the simplest, most cost-effective architecture that solves your problem.
Flexible Engagement: Available 40 hrs/week for both long-term retainers and fixed-scope projects.
Why Choose Me?
If you need help designing, building, or rescuing a Java backend—especially involving data ingestion pipelines, microservices, or tricky third-party API integrations—I am the safe pair of hands you are looking for.
Message me with your requirements today, and I will reply with a concrete execution plan and an honest estimate.
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Compare Packages
| 特色 | Basic API | Standard Microservice | Enterprise System |
|---|---|---|---|
| Delivery Time | 3 days | 7 days | 14 days |
| Revisions | 1 | 2 | 3 |
| 1 Custom RESTful API Endpoint | ✓ | ✓ | ✓ |
| Database Integration (MySQL/PostgreSQL) | ✓ | ✓ | ✓ |
| Basic Error Handling & Validation | ✓ | ✓ | ✓ |
| Postman Collection for API Testing | ✓ | ✓ | ✓ |
| Full Source Code Delivery | ✓ | ✓ | ✓ |
| Complete Spring Boot Microservice (CRUD) | ✕ | ✓ | ✓ |
| Database Schema Design & Optimization | ✕ | ✓ | ✓ |
| Third-party API Integration (REST/RPC) | ✕ | ✓ | ✓ |
| Simple Vue Admin Dashboard (AI-assisted) | ✕ | ✓ | ✓ |
| Docker Configuration for Deployment | ✕ | ✓ | ✓ |
| High-Volume Data Ingestion (MQTT to Kafka pipeline) | ✕ | ✕ | ✓ |
| Microservices Architecture (Spring Cloud / Dubbo) | ✕ | ✕ | ✓ |
| Redis Distributed Locks & ShardingSphere Setup | ✕ | ✕ | ✓ |
| Complex Third-party Reporting Integration (AES/SHA256) | ✕ | ✕ | ✓ |
| Complete Frontend Admin Dashboard (Vue/JS via AI) | ✕ | ✕ | ✓ |
| CI/CD & Docker Deployment on Linux | ✕ | ✕ | ✓ |
| 30 Days Post-delivery Support | ✕ | ✕ | ✓ |
Portfolio
Examples of the seller's work related to this Zinn.
Multi-Province Construction Safety & IoT Supervision Platform
Large-scale microservices platform for construction safety supervision: project management, real-name worker registration, and real-time monitoring of tower cranes, hoists and environmental sensors. As lead backend engineer I built an MQTT (EMQX) to Kafka pipeline for real-time device telemetry, XXL-JOB reporting middleware (SHA256/AES) that auto-submits compliance data to multiple third-party regulatory platforms, and ShardingSphere-sharded MySQL with Redis distributed locks for concurrent writ
Emergency & Critical Care Workflow Platform for Hospitals
Real-time emergency and critical care workflow platform for hospitals, coordinating pre-hospital ambulances, in-hospital teams and national reporting in one flow. As main developer and core team lead I designed the workflow engine on Activiti 5, connected 120 vehicle terminals with hospital PC and mobile clients, and integrated automated reporting to the National Chest Pain Center platform. Result: hospitals passed national certification.
Extra Information
Core Tech Stack
My Workflow
Why Work With Me?
Service Details
Frequently Asked Questions
I am a senior Java backend expert, and I use modern AI tools (like GitHub Copilot and Cursor) to write Vue/JavaScript for admin dashboards. This means you get a fully functional frontend much faster and at a lower cost than hiring a dedicated frontend developer. I personally review, test, and ensure all frontend code connects perfectly with the backend APIs before delivery.
Absolutely. Upon delivery, you will receive the full, clean source code (Git repository) with 100% ownership. I also provide detailed API documentation (Postman/Swagger), database schemas, and clear deployment instructions (README/Docker).
I communicate via Zinn Hub messages or your preferred tool (Slack, Email). I provide daily written progress updates and am available for a quick sync call if needed. I am highly responsive and keep you informed at every stage of the development.
Yes. My Enterprise package includes CI/CD and Docker deployment on your Linux server. For Basic and Standard packages, I will provide the deployment scripts (Dockerfile, docker-compose) and guide you or your team step-by-step to deploy it smoothly.
Yes, I am available 40 hrs/week for long-term retainers. Many of my clients keep me on board for continuous feature development, maintenance, and system optimization. We can discuss a flexible hourly or monthly retainer after the initial project is delivered.
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