Java Middleware Engineer

We are seeking a highly skilled **Java Middleware Engineer** to design, develop, and maintain our enterprise integration platforms and middleware solutions. In this role, you will be responsible for building high-performance, scalable, and secure backend integration layers that connect disparate enterprise systems, databases, and third-party services. You will focus on API development, messaging systems, and application server configuration, ensuring seamless data flow, high availability, and low latency across our enterprise application ecosystem. **Key Responsibilities** + **Integration & API Development:** Design and develop robust, secure, and scalable RESTful APIs, SOAP web services, and microservices using Java and the Spring Boot framework. + **Messaging & Event Streaming:** Implement and manage asynchronous messaging and event-driven architectures using technologies such as Apache Kafka. + **Middleware Administration & Configuration:** Configure, deploy, and tune middleware application servers (e.g., Apache Tomcat, Oracle WebLogic) to ensure optimal performance and reliability. + **System Integration:** Connect legacy systems, modern cloud applications, and databases, ensuring data integrity, transaction management, and proper error handling across integration points. + **Security Implementation:** Implement enterprise-grade security standards, including SSL/TLS encryption, OAuth2, JWT, and secure API gateways. + **Performance Tuning & Troubleshooting:** Diagnose and resolve complex middleware bottlenecks, memory leaks, thread dumps, and connection pool issues in production and non-production environments. **Technical Skills & Qualifications** **Required:** + **Java Expertise:** Deep understanding of **Core Java (Java 8/11/17)** , multithreading, concurrency, and JVM internals. + **Frameworks:** Strong experience with **Spring Boot** , Spring MVC, Spring Security, and Spring Integration or Apache Camel. + **Messaging Systems:** Hands-on experience with enterprise messaging middleware, specifically **IBM MQ** , **Apache Kafka** , or RabbitMQ. + **Application Servers:** Experience deploying and configuring applications on **Apache Tomcat** , **Oracle WebLogic** , or JBoss. + **Web Services & Protocols:** Strong proficiency in REST, SOAP, JSON, XML, and HTTP/HTTPS protocols. + **Database Integration:** Solid understanding of SQL, JDBC, and ORM frameworks like Hibernate/JPA. **Preferred:** + Experience with containerization and orchestration + Familiarity with CI/CD pipelines (Git, Jenkins, Bitbucket). + Knowledge of API Gateway solutions **Experience & Education** + **Education:** Bachelor's degree in Computer Science, Software Engineering, Information Technology, or a related technical field. + **Experience:** + 3+ years of professional experience in software engineering with a strong focus on Java-based middleware, backend integration, or enterprise application development. + Proven experience troubleshooting application servers and messaging queues in high-transaction environments. ------------------------------------------------------ **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.