Java Developer

QAT Global, a US-based IT consulting firm with over 30 years of experience, is looking for a Java Developer to join our international team. We deliver world-class technology solutions with teams across the US, Costa Rica, and Brazil. This is a full-time, remote position (CLT hire in Brazil only), offering the opportunity to collaborate directly with our US-based client and distributed development teams. About the Role: As a Java Developer , you will work on the design, development, and maintenance of Java-based applications that support key business functions. A strong command of Java 8 and hands-on experience with the ELK Stack (Elasticsearch, Logstash, Kibana) are essential for this role, as you will be deeply involved in log validation, performance optimization, and application stability. This position is ideal for a professional who thrives in an agile, collaborative environment and enjoys solving complex technical challenges across multiple applications. Key Responsibilities: Develop, maintain, and enhance Java 8 applications using Spring Framework (Spring 4.1.3 and Spring Security 3.2.5). Lead and participate in application migration projects , with a focus on optimizing and validating logs in ELK . Implement and fine-tune Elasticsearch indexing, querying, and data retrieval for high-performance applications. Maintain and enhance front-end components using JSP, jQuery, and AngularJS . Configure and deploy applications on Tomcat servers , ensuring reliability outside OpenShift environments. Collaborate with cross-functional teams to manage approximately 40 applications , maintaining stability and version consistency. Utilize Azure DevOps templates for CI/CD pipelines. Implement and maintain automated smoke tests for proactive issue detection. Required Qualifications: Expert-level experience with Java 8 and Spring Frameworks (Spring 4.1.3, Spring Security 3.2.5). Proven expertise working with the ELK Stack (Elasticsearch, Logstash, Kibana) for log management, validation, and performance analysis. Strong understanding of Tomcat server configuration and deployments. Experience developing scalable applications with Spring Boot 1.5.x . Familiarity with Azure DevOps and automated testing frameworks . Solid knowledge of UI frameworks (JSP, jQuery, AngularJS). Excellent problem-solving skills, particularly in debugging, log validation, and application migration. Strong English communication skills and ability to work effectively in distributed teams. Bachelor's degree in Computer Science , Information Technology , or related field (or equivalent experience). Preferred Qualifications: BS/MS in Systems Analysis and Development , Computer Science , or Computer Engineering . Additional experience in client-facing roles or international projects.