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I will develop java spring boot rest apis and microservices
Raul Guarin
About this gig
Senior Software Engineer with 12+ years of experience developing enterprise applications using Java, Spring Boot, Java EE, Angular, REST APIs, Microservices, JPA/Hibernate, and SQL databases.
I apply industry best practices including Clean Code, SOLID Principles, Clean Architecture, Hexagonal Architecture, Domain-Driven Design (DDD), Design Patterns, Secure Coding Standards, and OWASP guidelines. My focus is delivering scalable, maintainable, secure, and high-performance solutions.
Experienced in API development, third-party integrations, authentication and authorization, performance optimization, database design, and software modernization.
My workflow includes code reviews, unit testing with JUnit and Mockito, API documentation with Swagger/OpenAPI, Git version control, and continuous quality improvement practices.
I deliver clean, well-documented, production-ready code aligned with business requirements and industry standards.
Get to know Raul Guarin
Raul Guarin
Senior Full Stack Software Engineer
- FromColombia
- Member sinceJun 2026
Languages
English, Spanish
I am a Senior Full Stack Software Engineer with over 12 years of experience designing and developing scalable web applications using microservices architecture. I have extensive expertise in Java-based ecosystems, modern JavaScript frameworks, and enterprise systems across the financial and healthcare sectors. I have a proven track record in building robust backend services and managing large-scale data systems.
FAQ
What technologies do you work with?
I specialize in Java, Spring Boot, Java EE, Angular, REST APIs, Microservices, JPA/Hibernate, SQL databases, and enterprise application development.
Do you provide source code?
Yes. All packages include complete source code unless otherwise specified in the project requirements.
Do you follow software development best practices?
Yes. I follow Clean Code, SOLID Principles, Clean Architecture, Hexagonal Architecture, Design Patterns, DDD, and OWASP security guidelines.
Can you fix bugs in an existing application?
Yes. I can analyze, troubleshoot, and fix issues in existing Java, Spring Boot, Java EE, and Angular applications.
Do you write unit tests?
Yes. I can create and maintain unit tests using JUnit and Mockito to improve code quality and reliability.
Can you develop REST APIs?
Yes. I can design, implement, document, and integrate secure REST APIs using industry best practices.
Do you sign NDAs?
Yes. I am willing to work under Non-Disclosure Agreements when required.
What do you need before starting a project?
A clear description of the requirements, business rules, expected functionality, and any existing documentation or codebase.
