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I will develop, fix and debug your java spring boot rest API
Kashfi
About this gig
Your Spring Boot API is throwing errors, running slow, or simply won't build and every hour it stays broken costs you customers and revenue. I fix that.
Most freelancers can write basic CRUD endpoints but panic when they hit a real bug: NullPointerExceptions in production, broken JPA relationships, failing Maven builds, 500 errors with no clear stack trace, or APIs that time out under load. Vague documentation and inherited legacy code make it worse.
I'm a Senior Java Backend Developer with 5+ years building and rescuing enterprise-grade Spring Boot systems at Capgemini, CGI, Accenture and Infosys Finacle. I read your codebase, isolate the root cause, and ship a clean, tested fix not a band-aid.
Why Me
- 5+ years enterprise Java/Spring Boot experience across banking, insurance and product companies
- Comfortable in inherited/legacy codebases with zero documentation
- I explain the root cause in plain English, not just "fixed it"
- Enterprise coding standards: clean architecture, proper exception handling, unit tests
What I Deliver: A working, debugged, or newly built Spring Boot REST API with clean code, documented endpoints (Postman/Swagger).
Get to know Kashfi
Kashfi
Java Developer Spring Boot REST API Microservices N8N Angular
- FromIndia
- Member sinceJul 2019
- Avg. response time1 hour
Languages
English
SAFe® Certified Java Spring Boot Developer with 5+ years of experience building scalable enterprise applications using Java, Spring Boot, Angular, Microservices, REST APIs, JWT, Docker, and SQL. I specialize in backend architecture, API integrations (Stripe, PayPal, third-party APIs), performance optimization, bug fixing, and secure, production-ready solutions. I also build AI-powered applications with Spring AI and RAG. If you need a reliable developer to deliver high-quality, maintainable software on time, let's build your next project.
Other Software Development Services I Offer
FAQ
Do you work with existing/legacy codebases?
Yes, I regularly inherit undocumented Spring Boot projects and stabilize them.
Can you fix production bugs urgently?
Yes, message me with the error log — I offer expedited delivery for critical issues.
Which databases do you support?
MySQL, PostgreSQL, SQL Server, and JPA/Hibernate-based ORMs.
Can you review my code even if you don't fix it yet?
Yes, order Basic for a diagnosis-first approach.
Do you provide API documentation?
Yes, Swagger or Postman/Bruno collection with every delivery.
Can this integrate with my Angular/React frontend?
Yes, I build CORS-safe, frontend-ready REST APIs.
What if the bug takes longer than expected?
I'll notify you immediately with a revised timeline before continuing.
Do you sign NDAs?
Yes, happy to sign your NDA before receiving any code.
Can you deploy the fixed API to my server?
Yes, Docker-based deployment is available as an add-on
