Senior Java Backend Architect - Payments Modernization

Citi; Jersey City (NJ); On-site; USD 142,000 - 213,000; Full time

Job summary

Citi in Jersey City, NJ, is hiring a Senior Java Backend Developer to modernize CitiDirect’s Payment architecture. You will design, implement, and optimize Java backend services, architect microservices with Spring and Spring Cloud, and build event-driven systems with Apache Kafka.

Proficiency in MongoDB, Oracle, and secure REST APIs is required. The role demands 7+ years of Java experience, deep knowledge of reactive programming, and strong testing with JUnit/Mockito.

Qualifications

• 7+ years of Java development experience with core Java concepts.
• Proven experience with Spring Framework, including Spring Boot and Spring Cloud.
• Design and implement microservices architectures.
• Reactive programming experience.
• Strong Kafka experience for event-driven systems.
• MongoDB schema design, complex queries, and performance optimization.
• Oracle databases and SQL, with performance optimization.
• RESTful API design principles.
• Unit and integration testing with JUnit/Mockito.
• Secure coding practices and OAuth2/JWT authentication/authorization.

Responsibilities

• Design, develop, and maintain robust, scalable, high-performance Java backend services.
• Architect and implement microservices using Spring Framework 6, Spring Boot 3 and Spring Cloud.
• Design and implement event-driven architectures using Apache Kafka.
• Work with MongoDB and Oracle—design schemas and optimize queries.
• Implement and maintain comprehensive unit and integration tests.
• Participate in code reviews and mentor junior developers.
• Contribute to continuous improvement of development processes and best practices.

Skills

Java

Spring Framework

Microservices

Reactive programming

Apache Kafka

MongoDB

Oracle

RESTful API design

JUnit/Mockito

Security (OAuth2/JWT)

Tools

Spring Boot 3

Spring Cloud

Kafka

MongoDB

Oracle SQL

JUnit

Mockito

Docker

Kubernetes

Job description

Citi in Jersey City, NJ, is hiring a Senior Java Backend Developer to modernize CitiDirect’s Payment architecture. You will design, implement, and optimize Java backend services, architect microservices with Spring and Spring Cloud, and build event-driven systems with Apache Kafka.

Proficiency in MongoDB, Oracle, and secure REST APIs is required. The role demands 7+ years of Java experience, deep knowledge of reactive programming, and strong testing with JUnit/Mockito.