You will get a diagnosed and fixed Java or Spring Boot backend issue
Project details
I will investigate and fix a focused Java or Spring Boot backend issue. This service is designed for bugs, failing endpoints, configuration problems, dependency or build errors, persistence issues, API integrations, and similar tasks that need senior attention without becoming a large project. I will reproduce the problem where possible, identify the root cause, implement a maintainable fix, and verify the result with targeted checks or automated tests.
Programming Languages
JavaWhat's included
| Service Tiers |
Starter
$99
|
Standard
$199
|
Advanced
$349
|
|---|---|---|---|
| Delivery Time | 2 days | 3 days | 5 days |
Number of Revisions | 0 | 0 | 0 |
Design Customization | - | - | - |
Content Upload | - | - | - |
Responsive Design | - | - | - |
Source Code | - | - | - |
Frequently asked questions
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RF
Raimondo F.
Sep 16, 2025
PoC - JAVA APIs
AA
Ali A.
Oct 26, 2024
hardcore JAVA developer help needed
JR
Jesse R.
Oct 17, 2024
Need help upgrading Java 11 gradle project to Java 17
Ivan knows exactly what he is doing! He was able to help me fix my Java issue but also taught me a lot in the process. It was well worth every penny. This is your GO-TO guy!
RF
Raimondo F.
Apr 4, 2024
Fix a java class
RF
Raimondo F.
Apr 4, 2024
continue on
About Ivan
Senior Java & Spring Boot Engineer | Debugging, APIs & Upgrades
100%
Job Success
Sofia, Bulgaria - 5:05 am local time
My Certifications:
- Oracle Certified Associate Java Programmer - 75%
- Oracle Certified Professional Java Programmer - 80%
- VMware Spring Professional Certification Exam - 85%
- Oracle Database 19c Administration Level 1 - 65%
- MySQL 8.0 Database Developer - 85%
I specialize in Java, Spring Boot, and relational databases. I’m particularly interested in focused technical assignments—problems that need experienced investigation and a reliable solution.
I can help with:
• Debugging Java and Spring Boot applications
• REST API development, troubleshooting, and third-party integrations
• Java, Spring Boot, Maven, and Gradle upgrades
• Hibernate, JPA, JDBC, and persistence-layer problems
• SQL debugging and query performance optimization
• Database design, schema changes, indexing, and data migrations
• Transactions, locking, concurrency, and data-consistency issues
• Oracle Database, PostgreSQL, MySQL, and Microsoft SQL Server
• Spring Security, authentication, and authorization
• Project Reactor, Spring WebFlux, and reactive applications
• Kafka integrations and event-driven systems
• Testing with JUnit and Mockito
• Docker, Linux, Jenkins, and deployment troubleshooting
• Code reviews, refactoring, and focused backend features
I use modern AI-assisted engineering tools extensively to analyze new codebases, investigate problems, evaluate possible solutions, create targeted tests, and improve documentation. I review and verify the results myself and remain fully responsible for every delivered change.
Steps for completing your project
After purchasing the project, send requirements so Ivan can start the project.
Delivery time starts when Ivan receives requirements from you.
Ivan works on your project following the steps below.
Revisions may occur after the delivery date.
Reproduce and diagnose
Review the supplied information, reproduce the issue where possible, and isolate the root cause.
Implement the fix
Apply the agreed code, configuration, build, API, or persistence-layer change.