Browse categories
Explore
Fiverr Pro
English
$
USD
I will fix bugs and errors in your java spring boot application
Alex AI
About this gig
Is your Java Spring Boot application throwing errors, crashing, or failing in production? I will find the root cause and fix it fast.
With 8+ years of experience as a Senior Java Backend Developer, I don't just apply patches. I analyze transaction boundaries, concurrency issues, and framework internals to resolve problems permanently.
MY CORE EXPERTISE:
Spring Boot startup & bean injection failures
REST API errors (400/500 status, JSON mapping issues)
Spring Security: JWT, Authentication & Authorization bugs
Database: Spring Data JPA & Hibernate N+1, lazy loading exceptions, slow queries
Concurrency: thread safety, race conditions, deadlocks
Third-party API integration & timeout handling
WHY CHOOSE ME:
8+ years of hands-on production backend experience
Deep understanding of JVM internals and Spring ecosystem
Clean, maintainable code fixes that wont break existing features
Fast turnaround: most bugs analyzed within 24 hours
Please send me a message with your error stack trace or a brief description of the issue before placing an order. This ensures we are aligned on the scope and timeline of your project!
Get to know Alex AI
Alex AI
I build AI RAG chatbots integrated with your APIs and data
- FromChina
- Member sinceJul 2026
- Avg. response time1 hour
Languages
English, Chinese
Senior Backend Developer (8+ yrs) skilled in Dify. I build AI chatbots that answer questions based on your own PDF files or web content.
Unlike non-tech users, I understand the logic behind LLMs and can optimize settings for better accuracy.
My Services:
• Setup Q&A bot using your PDF documents.
• Create FAQ bot for your website content.
• Basic prompt tuning for clear replies.
Tech Stack: Dify, Llama3, GPT models.
I provide a ready-to-use chatbot link. Reliable and quick.
My Portfolio
FAQ
What information do you need to start fixing my bug?
Please share the exact error message or stack trace, the relevant code snippet, and steps to reproduce the issue. Also let me know your Java version and Spring Boot version.
Can you fix bugs in production environments?
Yes. I have extensive experience with production systems. I will carefully analyze the issue and provide a fix that won’t break existing functionality. For critical production issues, please message me first.
What if the bug turns out to be more complex than expected?
Transparency is key. If I investigate and find the issue is deeper than the package you ordered, I will explain the root cause. You can then choose to upgrade the package. No hidden charges.
Do you also work with Spring Boot 3 and Java 17/21?
Absolutely. I am proficient across all Spring Boot versions (2.x and 3.x) and Java versions from 8 through the latest LTS releases (17 and 21).
Will you explain what caused the bug?
Yes. Every fix includes a brief explanation of the root cause so you can prevent it from happening again.
