Mid-Level Support Engineer L3 (Java + Spring Boot), Brazil

At CI&T, we help large enterprises transform the potential of AI into real business impact with AI Deployment, AI-native execution, and tech-integrated business solutions.With 30 years of experience in technological transformation, we accelerate innovation with expertise in Agentic SDLC, Application modernization, Data & AI, Martech and Business strategy.We are 8,000 CI&Ters across more than 25 countries, collaborating to build solutions with real impact. AI is already part of how we work, evolve, and innovate every day.About the RoleWe are looking for a Mid-Level Java Backend Developer to join our Level 3 (L3) Application Support team, supporting a large-scale B2B e-commerce platform in the alcoholic beverage industry, currently operating across 40 countries.In this role, you will focus on ensuring the stability, reliability, and performance of backend applications, investigating complex technical incidents, identifying root causes, and implementing sustainable solutions.You will work closely with cross-functional teams to troubleshoot production issues, maintain microservices and APIs, and continuously improve application quality and operational efficiency.This opportunity is ideal for someone with a strong Java development background who enjoys technical investigation, problem-solving, and working with complex distributed systems in a production environment.What you will do:Provide Level 3 (L3) technical support for backend applications developed with Java, Spring, and Spring BootInvestigate, troubleshoot, and resolve complex application incidents and production issues escalated from previous support levelsPerform root cause analysis (RCA), identify recurring issues, and implement long-term fixes to prevent incidentsAnalyze application logs, errors, and performance metrics using monitoring and observability tools such as New RelicMaintain, troubleshoot, and improve microservices, RESTful APIs, and system integrationsInvestigate issues involving relational and non-relational databases, including data access and persistence using Spring Data and JPATroubleshoot asynchronous communication and messaging integrations using technologies such as Kafka and RabbitMQImplement bug fixes, code improvements, and preventive solutions to enhance application stability and performanceDevelop and maintain unit and integration tests using JUnit and Mockito to validate fixes and reduce regression risksCollaborate with development, infrastructure, and other support teams to resolve incidents and improve system reliabilitySupport application deployment and CI/CD processes, working with technologies such as Docker and KubernetesDocument technical investigations, solutions, and recurring issues to support knowledge sharing and continuous improvementMust-have:Solid hands-on experience with Java, Spring, and Spring BootExperience in application support, production troubleshooting, or maintenance of backend systems, preferably in L3 support environmentsStrong troubleshooting and problem-solving skills, with the ability to investigate complex technical issues and identify root causesSolid understanding of microservices architecture and RESTful APIsExperience analyzing application logs, monitoring system behavior, and investigating performance issuesKnowledge of monitoring and observability tools, such as New RelicFamiliarity with relational and non-relational databases, including SQL queries and persistence frameworks such as Spring Data and JPAKnowledge of messaging systems such as Kafka and RabbitMQExperience with automated testing frameworks, including JUnit and MockitoFamiliarity with CI/CD practices, Docker, and KubernetesGood understanding of object-oriented programming, design patterns, clean code, and software engineering best practicesUnderstanding of testing methodologies, including unit, integration, regression, smoke, and end-to-end testingProactive mindset, ownership, and the ability to work collaboratively across technical teamsStrong analytical and communication skillsUpper-intermediate to advanced English proficiency, with the ability to communicate effectively in an international environmentOur benefits: -Health and dental insurance-Meal and food allowance-Childcare assistance-Extended paternity leave-Partnership with gyms and health and wellness professionals via Wellhub (Gympass) TotalPass;-Profit Sharing and Results Participation (PLR);-Life insurance-Continuous learning platform (CI&T University);-Discount club-Free online platform dedicated to physical, mental, and overall well-being-Pregnancy and responsible parenting course-Partnerships with online learning platforms-Language learning platformAnd many more! More details about our benefits here: https://ciandt.com/br/pt-br/carreiras At CI&T, inclusion starts at the first contact. If you are a person with a disability, it is important to present your assessment during the selection process. See which data needs to be included in the report by clicking here.This way, we can ensure the support and accommodations that you deserve. If you do not yet have the assessment, don't worry: we can support you in obtaining it. We have a dedicated Health and Well-being team, inclusion specialists, and affinity groups who will be with you at every stage. Count on us to make this journey side by side.