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$
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I will build or fix your rest API with java spring boot
Guillermo F
About this gig
Hi! I'm a senior backend developer with 15+ years of experience in Java and Spring. I can help you with your REST API: fixing bugs, adding new endpoints, validation and error handling, connecting it to a database (JPA/Hibernate, PostgreSQL) or integrating external REST and SOAP services (payments, banks, third-party APIs). I use AI tools every day to work faster and deliver clean, working code. Please send me a message before ordering with a short description of your project, so I can confirm the scope and delivery time. Thanks!
Get to know Guillermo F
Guillermo F
Senior Software Engineer
- FromSpain
- Member sinceMay 2025
Languages
Spanish, English
I am a software engineer with over 15 years of experience, focused on backend development with Java and the Spring ecosystem. I specialize in API design, systems integration, and mission-critical applications across FinTech and public sectors. I leverage AI tools as a productivity multiplier to deliver full-stack solutions and high-quality code.
Other Software Development Services I Offer
FAQ
Which Java and Spring Boot versions do you work with?
From Java 8 to recent versions, and from older Spring Boot 1.x projects to Spring Boot 3. Legacy code is not a problem.
Do you also work on the frontend?
My focus is the backend. I can help with small frontend changes (Angular or React) using AI tools, but for a big frontend project a frontend specialist is a better choice.
Can we communicate in Spanish?
Yes, Spanish is my native language. In English I prefer written communication through the Fiverr chat.
