Senior Java Developer

The client is seeking a Senior Java Developer responsible for enhancing and supporting Java-based backend systems with a focus on Spring Reactor, Spring WebFlux, reactive programming, and cloud-hosted services. This role will help support and evolve service-layer applications, troubleshoot sustainment issues, and contribute to reactive Java development using Java 17, WebFlux, Reactor, MongoDB, and AWS/cloud technologies., * Design, develop, and maintain backend services using Java 17, Spring Boot, Spring WebFlux, and Spring Reactor.

• Build and support reactive REST APIs using Project Reactor, Mono, Flux, and WebFlux.
• Analyze sustainment issues quickly and provide practical technical solutions.
• Support and enhance service-layer applications in a cloud-hosted environment.
• Work with MongoDB and understand considerations around reactive data access and blocking database behavior.
• Collaborate with engineering teammates to support ongoing development, troubleshooting, and knowledge transfer.
• Promote best practices in code quality, CI/CD, testing, and production support.
• Conduct code reviews and contribute to maintainable, reliable backend services.
• Stay current on Java, Spring Reactor, WebFlux, and cloud-native development practices.

• 5+ years of professional Java development experience.
• Strong Java 17 experience.
• Strong Spring Boot experience.
• Hands-on experience with Spring WebFlux and Spring Reactor.
• Experience building or supporting reactive applications using Mono and Flux.
• Strong understanding of RESTful API development and integration.
• Ability to explain a real WebFlux application and the candidate's personal role in building or supporting it.
• Experience troubleshooting backend service issues and quickly identifying practical fixes.
• Familiarity with MongoDB or other database technologies.
• Familiarity with AWS or cloud-hosted application environments.
• Familiarity with modern DevOps and version control tools such as Git, Jenkins, Docker, or similar.

Required Education

• Bachelor''s degree in Computer Science or related field.
• Master''s degree preferred.

Preferred Skills

• Experience using MongoDB with reactive Java applications.
• Experience with Java 17 to Java 21 migration.
• Experience with AWS services or cloud-hosted deployments.
• Experience with hospitality, travel, commerce, or adjacent customer-facing business domains.
• Experience with Kubernetes or containerized application environments.
• Knowledge of microservices architecture and event-driven systems.
• Familiarity with NestJS or willingness to support JavaScript/NestJS-adjacent service work.
• AWS Certification is a plus.