[Job-32362] Senior Backend Developer (Java), 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.

We’re looking for a Senior Java Backend Developer to join a CI&T squad working on a financial services client. You’ll help modernise an established Java web platform. That means building new services and APIs, keeping the existing platform stable, and gradually moving legacy functionality onto a cleaner architecture. You’ll work closely with frontend developers, QA, a Product Owner and a Tech Lead, using agile practices.

**What you’ll do**

• Design, build and maintain backend services and RESTful APIs in Java
• Write clean, testable code with good unit and integration test coverage using JUnit
• Model data and write efficient SQL against Oracle DB, and tune queries, indexes and transactions
• Understand, maintain and refactor legacy modules, including XSLT-rendered pages, and help plan their migration
• Join refinement sessions: break features down into technical tasks, estimate them and raise risks early
• Review pull requests and help keep coding standards and technical documentation in good shape
• Work with DevOps and QA on build pipelines, deployments and production support
• Help investigate and fix incidents across environments

**What you need (must-have)**

• Around 5 years of professional experience in backend development with Java (Java 11+, ideally 17/21)
• Solid automated testing skills with JUnit, plus mocking frameworks such as Mockito
• Hands-on experience with Maven: multi-module projects, dependency management and build lifecycle
• Experience building Java web applications: REST APIs, JSON/XML handling, HTTP and request/response lifecycle
• Good knowledge of a Java application framework (Spring Boot, Jakarta EE or similar) and persistence with JPA/Hibernate
• A solid grasp of object-oriented design, SOLID principles and common design patterns
• Experience with Git, branching strategies and pull request workflows
• Familiarity with CI/CD pipelines (e.g. Jenkins, GitHub Actions, GitLab CI or Azure DevOps)
• Experience working in agile teams (Scrum or Kanban)
• Good English communication skills for working with international stakeholders

**Nice to have**

• Quarkus, or other cloud-native Java frameworks
• Apache Kafka: producers, consumers, topics and event-driven design

AWS S3, and AWS services in general

• Maintaining or migrating legacy pages built with XSLT (and XML/XPath)
• Database migration tools such as Flyway or Liquibase
• API documentation with OpenAPI/Swagger
• Containerisation with Docker; exposure to Kubernetes or OpenShift
• Application security basics: OAuth2/OIDC, JWT, and OWASP Top 10 awareness
• Observability: structured logging, metrics and tracing (e.g. ELK, Grafana, OpenTelemetry)
• Code quality tools such as SonarQube
• Experience in banking or other regulated environments

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