I will build or fix your java spring boot rest API

R
robert_rotaru
R
robert_rotaru
Robert R
build or fix your java spring boot rest API
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build or fix your java spring boot rest API

About this gig

Need a reliable backend or stuck on a Spring Boot bug? I'm a backend engineer who has built production Java services in an enterprise team, and I'll deliver clean, tested code you can maintain.


I can help with:

  • New REST endpoints or a complete CRUD module (Spring Data JPA, PostgreSQL/MySQL/MongoDB)
  • Fixing bugs, failing builds and confusing exceptions
  • Validation, error handling and OpenAPI/Swagger docs
  • JWT security with Spring Security
  • Kafka producers/consumers for event-driven services
  • Docker setup so it runs the same everywhere


What you get:

  • Source code in your Git repo or as a ZIP
  • Unit/integration tests for what I build
  • A short README on how to run it


Stack: Java 17/21, Spring Boot 3, Maven/Gradle, JUnit, Testcontainers, Docker.


Please message me first with your repo or a short description, so I can confirm the right package. I don't do academic exams or graded assignments.

  • Expertise

    • Debugging
    • Performance
    • Security
    • Databases
    • Testing procedures

  • Programming language

    • Java

  • Backend framework

    • Spring
    • Spring Boot

Get to know Robert R

Robert R

Backend and AI integration engineer

  • FromSpain
  • Member sinceOct 2026

  • Languages

    English, Romanian, Spanish, German
Backend engineer with 2+ years of professional experience building Java and Spring Boot services, Kafka event-driven systems and CI/CD pipelines at OpenText and Pitch Tech. I also build AI integrations in Python: LLM agents with LangChain and FastAPI, and MCP servers that connect Claude or ChatGPT to real APIs and data. Here I take on small, well-scoped projects: REST APIs, bug fixes, MCP servers and Python automation for Excel reports. BSc in Computer Science from Babeș-Bolyai University, Master's student at UPM in Madrid, Silver Medal at the Romanian National Olympiad in Informatics.

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