**Java Ecosystem (Microservices, Spring Boot, Kafka, Oracle, MongoDB):** + **Languages & Frameworks:** Java, Spring Boot, Spring Cloud, Quarkus, Micronaut. + **Build Tools:** Maven, Gradle. + **Testing:** JUnit, Mockito, Postman, JMeter, Selenium, Cucumber. + **Message Brokers:** Apache Kafka, RabbitMQ, ActiveMQ. + **Databases:** Oracle Database (Relational), MongoDB (NoSQL Document DB), PostgreSQL, MySQL, Cassandra, Redis. + **API Management:** OpenAPI/Swagger, Postman. + **Monitoring & Logging:** Prometheus, Grafana, ELK Stack (Elasticsearch, Logstash, Kibana), Splunk, Datadog. + **Distributed Tracing:** Jaeger, Zipkin. + **Service Mesh:** Istio, Linkerd. + **Frontend Development (ReactJS, NodeJS):** + **Languages & Frameworks:** JavaScript, TypeScript, React, Next.js, Redux, Zustand, React Query. + **Build Tools:** Webpack, Vite, Babel, npm, Yarn. + **(Node.js/Backend):** Express.js, NestJS, + **Databases (Node.js/Backend):** PostgreSQL, MongoDB, MySQL (often with ORMs like Sequelize, TypeORM, Mongoose). + **Containerization & Orchestration (OpenShift, Docker, Kubernetes):** + **Containerization:** Docker, containerd. + **Orchestration:** Kubernetes (K8s), OpenShift (Red Hat's Kubernetes distribution), Docker Swarm. + **CI/CD:** Jenkins, GitLab CI, GitHub Actions, Argo CD, Tekton. + **Monitoring & Logging:** Prometheus, Grafana, ELK Stack, Jaeger. ------------------------------------------------------ **Job Family Group:** Technology ------------------------------------------------------ **Job Family:** Applications Development ------------------------------------------------------ **Time Type:** Full time ------------------------------------------------------ **Most Relevant Skills** Please see the requirements listed above. ------------------------------------------------------ **Other Relevant Skills** For complementary skills, please see above and/or contact the recruiter. ------------------------------------------------------ _Citi is an equal opportunity employer, and qualified candidates will receive consideration without regard to their race, color, religion, sex, sexual orientation, gender identity, national origin, disability, status as a protected veteran, or any other characteristic protected by law._ _If you are a person with a disability and need a reasonable accommodation to use our search tools and/or apply for a career opportunity review_ _Accessibility at Citi (https://www.citigroup.com/citi/accessibility/application-accessibility.htm)_ _._ _View Citi’s_ _EEO Policy Statement (https://www.citigroup.com/global/eeo-aa-policy)_ _and the_ _Know Your Rights (https://www.eeoc.gov/sites/default/files/2023-06/22-088\_EEOC\_KnowYourRights6.12ScreenRdr.pdf)_ _poster._ Citi is an equal opportunity and affirmative action employer. Minority/Female/Veteran/Individuals with Disabilities/Sexual Orientation/Gender Identity.