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.

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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.

 

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