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I will build and integrate java spring boot rest apis
Nishant K
About this gig
Is your Java Spring Boot application showing errors, failing REST APIs, or unexpected behavior?
I will diagnose and fix Java Spring Boot bugs, REST API errors, and backend issues.
With 9+ years of professional Java development experience, I work with enterprise applications, banking systems, microservices, REST APIs, and cloud-native applications.
I can help with:
Java and Spring Boot bugs
REST API errors and integration issues
HTTP 400, 401, 403, 404, and 500 errors
Spring MVC issues
Spring Data JPA and Hibernate problems
Database integration issues
JSON request/response problems
Microservice communication issues
Maven/Gradle build errors
Unit and integration test failures
Backend performance issues
Code debugging and root-cause analysis
Technologies I work with:
Java | Spring Boot | Spring MVC | Spring Data JPA | Hibernate | REST API | PostgreSQL | Oracle | Microservices
My goal is to identify the root cause, implement a clean fix, and verify that the issue is resolved.
Please contact me before ordering and share the error message, logs, relevant code, or project details so I can understand the issue and confirm the scope.
Get to know Nishant K
Nishant K
Senior Java Spring Boot Developer Microservices AI
- FromIndia
- Member sinceAug 2026
- Avg. response time1 hour
Languages
English
Senior Java & Spring Boot Developer with 9+ years of experience building scalable, production-ready applications for Banking, Fintech, Wealth Management, Logistics and Pricing.
I specialize in Java 8–21, Spring Boot, Microservices, REST APIs, Kafka, gRPC, React, Azure, Kubernetes, Docker and CI/CD. I also build AI-powered solutions using Spring AI, LLMs, RAG and Prompt Engineering.
I focus on clean architecture, performance, scalability and reliable delivery.
Need to build, fix, modernize or optimize your application? Let’s discuss your project.
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FAQ
What information do you need before starting?
Please provide the error message, relevant logs, source code or project files, and a brief description of what you expect the application to do. This helps me understand the issue and confirm the scope before starting.
Can you fix Spring Boot REST API errors?
Yes. I can troubleshoot common REST API issues including 400, 401, 403, 404, and 500 errors, request/response mapping problems, validation issues, exceptions, and API integration problems.
Can you work with an existing Spring Boot project?
Yes. I can work with an existing Java Spring Boot project and investigate the reported issue without unnecessarily changing unrelated parts of the application.
Can you fix database and JPA/Hibernate issues?
Yes. I can troubleshoot Spring Data JPA, Hibernate, SQL, entity mapping, query, and database integration issues.
Do you provide a complete application?
This Gig is primarily for debugging and fixing existing Java Spring Boot applications. If you need a new application or a larger development project, please contact me first so I can review your requirements.
