Backend API Development (Java / Spring Boot)crystal zhu
I build production-ready backend APIs using Java and Spring Boot, with a strong focus on clean design, reliability, and real-world business logic.
I help teams turn requirements into working, maintainable APIs that developers can confidently extend and operate in production.
What's included
Backend API Implementation
Design and implementation of RESTful APIs using Java and Spring Boot, including controllers, services, and persistence layers aligned with business requirements.
Database Schema & Data Access Layer
Well-structured database schema and data access layer (JPA / SQL), supporting transactions, consistency, and future scalability.
Authentication, Validation & Error Handling
Implementation of authentication (JWT or similar), input validation, and consistent error handling for stable and secure APIs.
API Documentation & Handover Notes
Clear API documentation (Swagger / OpenAPI or written notes) and handover guidance so other developers can continue development smoothly.
FAQs
Yes. I can start from OpenAPI specs, existing repositories, or partial implementations and continue building in a clean, consistent way.
Yes. I specialize in workflow-heavy systems with state transitions, validations, and non-trivial domain rules.
I primarily focus on backend implementation, but I can support Dockerization and basic deployment setup if needed.
crystal's other services
Starting at$35 /hr
Tags
Docker
GitHub
Java
MySQL
Spring Boot
Backend Engineer
Software Engineer
Systems Engineer
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crystal zhu Hong Kong
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Backend API Development (Java / Spring Boot)crystal zhu
Starting at$35 /hr
Tags
Docker
GitHub
Java
MySQL
Spring Boot
Backend Engineer
Software Engineer
Systems Engineer
I build production-ready backend APIs using Java and Spring Boot, with a strong focus on clean design, reliability, and real-world business logic.
I help teams turn requirements into working, maintainable APIs that developers can confidently extend and operate in production.
What's included
Backend API Implementation
Design and implementation of RESTful APIs using Java and Spring Boot, including controllers, services, and persistence layers aligned with business requirements.
Database Schema & Data Access Layer
Well-structured database schema and data access layer (JPA / SQL), supporting transactions, consistency, and future scalability.
Authentication, Validation & Error Handling
Implementation of authentication (JWT or similar), input validation, and consistent error handling for stable and secure APIs.
API Documentation & Handover Notes
Clear API documentation (Swagger / OpenAPI or written notes) and handover guidance so other developers can continue development smoothly.
FAQs
Yes. I can start from OpenAPI specs, existing repositories, or partial implementations and continue building in a clean, consistent way.
Yes. I specialize in workflow-heavy systems with state transitions, validations, and non-trivial domain rules.
I primarily focus on backend implementation, but I can support Dockerization and basic deployment setup if needed.
crystal's other services
$35 /hr