I will build, fix, or optimize java spring boot rest apis and microservices

A
andrew_ng_1404
A
andrew_ng_1404
Andrew
build, fix, or optimize java spring boot rest apis and microservices
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About this gig

Need a Senior Java developer to build robust enterprise REST APIs, microservices, or fix

 stubborn Spring Boot bugs?

I have 4.5+ years of production experience developing scalable backend systems using Java and the Spring Boot ecosystem.


What I Offer:

  • Spring Boot Bug Fixing: Fix Spring Security (CORS, CSRF, JWT auth, RBAC), Hibernate/JPA errors (LazyInitialization, N+1 queries), and Maven/Gradle build issues.
  • REST APIs & Microservices: Java 8/11/17/21 LTS with Spring Boot 2.x & 3.x, Spring Data JPA, DTO mapping, validations, and clean architecture.
  • Database & Caching: PostgreSQL, MySQL, MongoDB, Redis caching, Kafka/RabbitMQ messaging, and Elasticsearch.
  • Testing & Docs: Unit/integration tests with JUnit 5 & Mockito, Swagger UI / OpenAPI docs, and Docker containerization.


Why Choose Me?

  • Certified Kubernetes Administrator (CKA)
  • 4.5+ years of enterprise production experience
  • SOLID principles & production-ready code

 Please contact me with your requirements or error logs before placing an order!

  • Programming language

    • Java

  • Expertise

    • Algorithms & Data structures
    • Debugging
    • Performance
    • Security
    • Databases

  • Backend framework

    • Spring Boot

  • AI & low/no code builders

    • Claude
    • Co.dev

Get to know Andrew

Andrew

Software Engineer

  • FromVietnam
  • Member sinceAug 2026
  • Avg. response time1 hour

  • Languages

    Vietnamese, English
I'm a Backend Engineer with 4.5+ years of experience building secure, scalable systems. Specializing in Golang and Java, I develop robust microservices, RESTful APIs, and AI integrations (RAG). As a CKA (Certified Kubernetes Administrator), I ensure seamless cloud-native deployments. I strictly apply OWASP Top 10 standards to guarantee top-tier application security. Whether you need automated workflows or high-traffic backends, I deliver performant solutions. Rate: $20/hr. Let’s build together!

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