CI&T - [Job - 32454] Mid-Level Support Engineer L3 (Java + Spring Boot), Brazil

• Provide Level 3 (L3) technical support for backend applications developed with Java, Spring, and Spring Boot. • Investigate, troubleshoot, and resolve complex application incidents and production issues escalated from previous support levels. • Perform root cause analysis (RCA), identify recurring issues, and implement long-term fixes to prevent incidents. • Analyze application logs, errors, and performance metrics using monitoring and observability tools such as New Relic. • Maintain, troubleshoot, and improve microservices, RESTful APIs, and system integrations. • Investigate issues involving relational and non-relational databases, including data access and persistence using Spring Data and JPA. • Troubleshoot asynchronous communication and messaging integrations using technologies such as Kafka and RabbitMQ. • Implement bug fixes, code improvements, and preventive solutions to enhance application stability and performance. • Develop and maintain unit and integration tests using JUnit and Mockito to validate fixes and reduce regression risks. • Collaborate with development, infrastructure, and other support teams to resolve incidents and improve system reliability. • Support application deployment and CI/CD processes, working with technologies such as Docker and Kubernetes. • Document technical investigations, solutions, and recurring issues to support knowledge sharing and continuous improvement. • Solid hands-on experience with Java, Spring, and Spring Boot. • Experience in application support, production troubleshooting, or maintenance of backend systems, preferably in L3 support environments. • Strong troubleshooting and problem-solving skills, with the ability to investigate complex technical issues and identify root causes. • Solid understanding of microservices architecture and RESTful APIs. • Experience analyzing application logs, monitoring system behavior, and investigating performance issues. • Knowledge of monitoring and observability tools, such as New Relic. • Familiarity with relational and non-relational databases, including SQL queries and persistence frameworks such as Spring Data and JPA. • Knowledge of messaging systems such as Kafka and RabbitMQ. • Experience with automated testing frameworks, including JUnit and Mockito. • Familiarity with CI/CD practices, Docker, and Kubernetes. • Good understanding of object-oriented programming, design patterns, clean code, and software engineering best practices. • Understanding of testing methodologies, including unit, integration, regression, smoke, and end-to-end testing. • Proactive mindset, ownership, and the ability to work collaboratively across technical teams. • Strong analytical and communication skills. • Upper-intermediate to advanced English proficiency, with the ability to communicate effectively in an international environment.