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Fiverr Pro
English
$
USD
Looks Like This Service Is On Hold
I will build java rest or graphql microservices
Zatadev
About this gig
I'm a senior backend engineer with 8+ years of experience, including projects for major companies like BNP Paribas and Société Générale.
I specialize in building scalable and secure Java microservices using Spring Boot or Quarkus. Ive worked on production systems involving:
- REST & GraphQL APIs
- Complex batch jobs (millions of records)
- Authentication (JWT, OAuth2)
- PostgreSQL, MongoDB
- Microservices architecture
- Performance and reliability improvements
What you'll get:
- Clean, modular, testable code
- API with or without DB
- Optional Swagger & Postman docs
- Ready for deployment
Perfect for MVPs, SaaS backends, or refactoring existing systems.
New to Fiverr, but not new to building real software. Lets discuss your project Ill prove my value through solid delivery.
Native French speaker
Fluent in written English (preferred for technical details)
Get to know Zatadev
Zatadev
- FromFrance
- Member sinceApr 2025
Languages
English, French
Développeur Java/Full-Stack avec plus de 8 ans d'expérience, spécialisé en optimisation de performances pour microservices et applications SaaS. Je transforme des défis techniques complexes en solutions performantes et élégantes. Expert en amélioration de processus back-end, prêt à booster l'efficacité de vos opérations. Discutons de votre projet !
FAQ
What makes your service different?
I combine enterprise-level experience (BNP, Société Générale...) with freelance flexibility. I focus on clean code, real scalability, and long-term maintainability — not quick fixes.
Do you use Spring Boot or Quarkus?
Yes, I work with both. I generally recommend Spring Boot for full-featured systems and Quarkus for fast, lightweight services. I can help you choose the best fit for your project goals.
Can you integrate a database (SQL or NoSQL)?
Absolutely. I’ve worked with PostgreSQL, MySQL, Oracle, MongoDB, and Firebase. I design clean and scalable data access layers, with validations and best practices in mind.
Is authentication (JWT, OAuth2) included
Yes, I can integrate JWT or OAuth2-based auth, depending on your needs. This includes secure endpoints, role-based access, and refresh tokens if required.
Do you write tests for the microservice
Yes. I follow clean code principles and can include unit and integration tests using JUnit and Testcontainers. Tests are included in Premium or can be added as an extra.
Can you explain or document the API
Yes. I can provide Swagger/OpenAPI documentation and Postman collections for developers or teams. Clear documentation is key to making your API easy to use and maintain.
Can you help improve or refactor existing code?
Yes. I can audit and improve existing Java microservices for performance, maintainability, and structure — even if the codebase is old or undocumented.
Do you support ongoing changes after delivery?
I offer support and additional updates if needed. You can either book extra revisions or contact me for a custom follow-up offer.
Can I ask questions before ordering?
Absolutely! Feel free to message me before placing an order. I’ll be happy to review your needs and suggest the best solution or package.
