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I will develop and troubleshoot java spring boot backends
Siyu Ren
About this gig
Need help developing, improving, or troubleshooting a Java Spring Boot backend?
I work on scoped Spring Boot backend tasks and existing projects, from REST APIs and persistence to security, build failures, runtime issues, and multi-problem diagnosis.
I can help with:
- Maven Wrapper, Enforcer, dependency, plugin, and build failures
- REST API development, debugging, and backend improvements
- JPA/Hibernate mappings, relationships, identity, and schema issues
- MySQL/PostgreSQL initialization and backend integration
- Spring Security, JWT authorities, Basic Auth, 401/403, RBAC, and CORS
- AI-generated Java backend rescue and multi-issue triage
- Spring Boot Docker/container deployment troubleshooting
My workflow is evidence-based: scoped triage, implementation or repair, focused regression, Maven regression when needed, and HTTP/DB/runtime acceptance when available.
Kubernetes, HA/zero-downtime, production SRE, penetration testing, enterprise DR, and large-scale Spring Cloud architecture are outside this Gig.
Please message me before ordering with the repo status, Java/Spring Boot versions, build command, sanitized logs, expected result, and relevant DB/Docker details.
Get to know Siyu Ren
Siyu Ren
AI App Troubleshooting and Backend Developer
- FromChina
- Member sinceJul 2026
- Avg. response time1 hour
Languages
Chinese, English
I help founders rescue and stabilize AI-built web apps and backend systems. I diagnose deployment failures, Supabase Auth/RLS problems, API and database bugs, and Spring Boot issues, then deliver tested fixes with clear handover notes. My stack includes Lovable, Bolt, Replit, React, Vite, Supabase, Vercel, Java, Spring Boot, REST APIs, PostgreSQL, MySQL, Redis, and n8n. With 8 years of backend experience, I focus on root-cause analysis, secure access, clear scope, and practical fixes without unnecessary rebuilding.
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FAQ
Can you develop new Spring Boot backend features?
Yes. I can develop or improve one agreed Spring Boot module or backend slice, including REST APIs, persistence, validation, security, and database-backed logic. Large platforms or unclear scopes require review and a custom offer.
Can you work with an existing or AI-generated Spring Boot project?
Yes. I can take over existing or AI-generated Java/Spring Boot code, triage multiple issues, define a scoped repair plan, and work on build, API, persistence, security, database, or runtime problems.
What Maven and build issues can you troubleshoot?
I can troubleshoot Maven Wrapper, Enforcer, dependency and transitive dependency issues, plugin failures, toolchain problems, and other scoped Spring Boot build failures.
Which persistence and database issues do you support?
I work with JPA/Hibernate, MySQL, and PostgreSQL on scoped backend issues such as mappings, relationships, identity, schema validation, initialization, connectivity, and persistence failures.
Can you troubleshoot Spring Security, JWT, and CORS?
Yes. I can work on Spring Security filter-chain issues, JWT claims and authorities, Basic Auth password encoding, 401/403 behavior, RBAC, and CORS preflight within an agreed backend scope.
Can you troubleshoot Docker or Linux deployment issues?
Yes, when they relate to a Spring Boot backend. I can diagnose Docker/container startup, configuration, runtime, logs, supporting database containers, and deployment compatibility. Kubernetes, HA, and production SRE are outside this Gig.
How do you verify the delivered work?
I use focused regression tests and Maven regression, then HTTP, database, and runtime acceptance when the environment supports it. I also provide a concise delivery summary with the verified scope and remaining boundaries.
