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Fiverr Pro
Português
$
USD
I will fix any java or spring boot issue, build apis, debug errors and optimize code
Carlos G
Sobre este Serviço
Is your Java project breaking, throwing weird errors, or acting like it has a life of its own?
Dont worry I can fix anything in Java.
I specialize in Java & Spring Boot, but I also handle full-stack, databases, APIs, architecture, and more:
What I can do for you in Java (pretty much everything):
- Fix ANY Java error (runtime, compile-time, logic issues)
- Debugging deep backend problems
- Build or repair Spring Boot services, microservices & modules
- Create REST APIs, controllers, services, repositories
- Implement JWT, Spring Security, Roles, OAuth2
- Integrate external APIs, microservices, messaging systems
- Work with Maven / Gradle, multi-module apps
- Handle Java Streams, Lambdas, Collections, Generics
- Optimize performance, refactor code & improve architecture
- Build full CRUD operations (backend or full stack)
- Multithreading, concurrency, executors, async tasks
- File handling, sockets, networking, serialization
- JPA, Hibernate, queries, relationships, migrations
- MySQL setup, optimization, schema redesign
- Unit tests & integration tests (JUnit, Mockito)
- Clean code, SOLID, design patterns (Singleton, Factory, Builder, etc.)
- UML diagrams, use-case docs & software architecture
- BPMN process modelin
Conheça mais sobre Carlos G
Carlos G
Backend developer
- A partir deMéxico
- Membro desdenov. de 2025
- Responde em aprox.:1 hora
- Última entrega4 meses
Idiomas
Espanhol, Inglês, Alemão
I’m a software developer focused on building clean, scalable, and efficient solutions. I work with Java, Spring Boot, Angular, and MySQL to create reliable web apps and APIs. I have experience with UML modeling, Figma UI design, automation scripts, and API testing with Postman. I use IntelliJ IDEA Ultimate and Git for professional workflows. I enjoy debugging, optimizing code, and delivering maintainable systems. One of my key projects involved extracting Amazon pricing data using the Keepa API. rech out me!!
Outros serviços de Desenvolvimento de Software que eu ofereço
Perguntas frequentes
What do you need to start working on my project?
Usually just your project files, a brief description of the issue, and any error messages or screenshots. For API or database work, access credentials may be required.
Can you fix my issue even if I don’t know what’s wrong?
Yes. I can analyze your code, identify the root cause, and provide a clean, working solution along with an explanation if requested.
Do you offer full-stack support?
Yes. I work with Java, Spring Boot, Angular, MySQL, REST APIs, UML, GitHub, Postman, and more—so I can help with backend, frontend, and database issues.
Can you work on university or academic projects?
Yes. I can assist with assignments, explain the code, and ensure you understand the solution.
Will you explain what you fixed?
If you want, I can provide detailed notes, comments, UML diagrams, or an explanation of what caused the issue and how it was solved.
Can you help set up my environment or tools?
Yes. I can assist with IntelliJ, Git/GitHub, Postman collections, local servers, MySQL setup, and project structure.
Do you handle API integrations or errors?
Absolutely. I can build, debug, optimize, or repair REST APIs—backend logic, endpoints, controllers, and database operations.
What if my project is very outdated or messy?
No problem. I can refactor, clean, and modernize your code to follow best practices and improve performance.
What if I’m not sure which service to select?
Just message me with a description of your problem. I’ll guide you to the right option or create a custom offer.
Can you work on projects in English and Spanish?
Yes. I can develop, debug, and document projects in both English and Spanish, depending on your preference.
