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
#LI-GP1
Skills Required
- Around 5 years of professional backend development experience with Java, preferably Java 11 or newer
- Automated testing experience with JUnit and mocking frameworks such as Mockito
- Hands-on Maven experience, including multi-module projects, dependency management, and build lifecycle
- Experience building Java web applications with REST APIs, JSON/XML handling, HTTP, and request-response lifecycle knowledge
- Knowledge of a Java application framework such as Spring Boot or Jakarta EE
- Persistence experience with JPA/Hibernate
- Understanding of object-oriented design, SOLID principles, and common design patterns
- Experience with Git, branching strategies, and pull request workflows
- Familiarity with CI/CD pipelines such as Jenkins, GitHub Actions, GitLab CI, or Azure DevOps
- Experience working in agile teams using Scrum or Kanban
- Good English communication skills for international stakeholder collaboration
- Experience with Quarkus or other cloud-native Java frameworks
- Apache Kafka experience with producers, consumers, topics, and event-driven design
- AWS S3 or broader AWS experience
- Experience maintaining or migrating legacy XSLT pages and working with XML/XPath
- Experience with Flyway or Liquibase
- Experience documenting APIs with OpenAPI or Swagger
- Docker containerization experience and exposure to Kubernetes or OpenShift
- Application security knowledge including OAuth2/OIDC, JWT, and OWASP Top 10
- Observability experience with structured logging, metrics, or tracing tools such as ELK, Grafana, or OpenTelemetry
- Experience with code quality tools such as SonarQube
- Experience in banking or other regulated environments
What We Do
CI&T is your end-to-end digital transformation partner. As a digital native, we bring a 27-year track record of accelerating business impact through complete and scalable digital solutions. With a global presence of 6,000+ professionals in strategy, research, data science, design and engineering, we unlock top-line growth, improve customer experience and drive operational efficiency.
