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.

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.

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 . View Citi’s EEO