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I will troubleshoot and fix your java spring boot backend issues
Kurnia
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About this gig
Having trouble with an existing Java or Spring Boot backend?
I'm a Senior Backend Engineer with 8+ years of experience debugging and maintaining production systems. I can investigate difficult backend issues, identify the root cause, and implement clean, maintainable fixes.
I can help with:
- Spring Boot errors, exceptions, and configuration issues
- Broken REST APIs and unexpected API behavior
- Spring Security, JWT, OAuth2, and authorization problems
- JPA, Hibernate, and database issues
- PostgreSQL, MySQL, MongoDB, and Redis
- Slow APIs and backend performance problems
- Microservice communication and integration issues
- Kafka consumers, retries, duplicate events, and event processing
- Docker and deployment-related backend issues
- Bugs inside existing or legacy Spring Boot applications
My approach is root-cause focused. I don't just patch symptomsI investigate why the problem happens and implement a fix that is safe and maintainable.
For complex production issues, multiple services, or unclear problems, please message me before ordering so I can review the scope.
Get to know Kurnia
Kurnia
Software Engineer
- FromIndonesia
- Member sinceJan 2023
- Last delivery1 year
Languages
English, Indonesian
Senior Backend Engineer with 8+ years of experience building, debugging, and improving production software.
I specialize in Java/Spring Boot, Go, TypeScript, APIs, microservices, Kafka, and backend architecture.
I can help fix complex backend issues, improve existing codebases, modernize legacy systems, build APIs, and integrate AI features.
I use AI-assisted development to move faster while applying experienced engineering judgment to architecture, testing, security, and production readiness.
FAQ
What do you need to investigate my issue?
Please provide the error message, relevant logs, reproduction steps, expected behavior, and any useful context about the affected code. Remove passwords, API keys, tokens, and production credentials before sharing anything.
What is covered by the Basic package?
The Basic package is for one clearly defined and reasonably reproducible backend issue. If the problem affects multiple services or the root cause is unknown and complex, please contact me first.
Can you work with an existing or unfamiliar codebase?
Yes. I regularly work with existing systems and unfamiliar codebases. I can trace issues across application logic, APIs, databases, integrations, and infrastructure-related configuration.
Can you troubleshoot Kafka or microservice issues?
Yes. I can investigate Kafka consumers, duplicate events, retries, event-processing problems, and communication issues between microservices. Please contact me first for complex production cases.
Can you also add new features?
This gig is primarily focused on troubleshooting and fixing existing systems. Small changes required as part of a fix are fine. For larger feature development, please message me for a custom offer.
Can you build a complete Spring Boot application from scratch?
Yes, but this gig is optimized for troubleshooting and existing backend work. For a new application or larger development project, please contact me so I can review the scope and prepare a custom offer.
