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I will integrate or build rest apis with java and spring boot
Jessica A
About this gig
I build and integrate REST APIs using Java and Spring Boot.
I have hands-on experience integrating external providers (payment systems, third-party APIs) and working with authentication protocols like OAuth2, JWT, and Keycloak in real production environments.
What I can help you with:
- Building new REST API endpoints
- Integrating third-party APIs into your system
- Implementing authentication (JWT, OAuth2)
- API documentation with Swagger/OpenAPI
What I need from you:
- API documentation (if integrating an external service)
- Description of what the endpoint should do
- Access credentials if needed
Message me before ordering if you're not sure your project fits.
Get to know Jessica A
Jessica A
Backend Software Engineer Java Spring Boot NestJS Bug Fixing
- FromChile
- Member sinceJun 2026
- Avg. response time1 hour
Languages
Spanish, English
Hi! I'm Jessica, a Backend Developer with 1+ year of experience in Java and NestJS microservices.
I've worked on high-concurrency systems handling withdrawals, deposits, wallets and authentication. I'm good at reading production logs and finding what's broken — fast.
I can help you with:
Bug fixing in Java or NestJS
REST API development and integration
Spring Boot microservices
Log analysis (Elasticsearch, Kibana)
Legacy Java (Java 8, WebLogic)
If something's broken, I'll find it.
My Portfolio
Other Software Development Services I Offer
FAQ
Do you need API documentation to start?
Yes, if you're integrating an external API, please share its documentation. If you're building a new endpoint, just describe what it should do.
Can you implement authentication for my API?
Yes, I have experience with JWT and OAuth2 authentication in production systems.
What if the external API I need isn't well documented?
Message me first with what you have. I've worked with incomplete documentation before and can usually find a way forward.
