Senior Java Backend Architect — Payments Modernization

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

Job summary

Citigroup Inc. is seeking a Senior Java Backend Developer to modernize CitiDirect’s Payment architecture in Jersey City, NJ. You will design, develop, and maintain high-performance Java backend services, architect microservices with Spring and Spring Cloud, and implement event-driven systems with Kafka.

Required are 7+ years in Java, Spring expertise, microservices experience, and strong API security. Familiarity with Docker/Kubernetes and CI/CD is preferred.

Qualifications

• 7+ years of Java development experience.
• Strong Spring Framework, Spring Boot, and Spring Cloud expertise.
• Proven microservices architecture experience.
• Reactive programming proficiency.
• Kafka-based event-driven design and implementation.
• MongoDB and Oracle SQL with performance optimization.
• RESTful API design and secure coding practices.
• Experience with unit/integration testing (JUnit/Mockito).
• OAuth 2.0 / JWT security in microservices.

Responsibilities

• Design, develop, and maintain robust Java backend services.
• Architect microservices with Spring 6, Spring Boot 3, Spring Cloud.
• Implement event-driven architectures using Kafka.
• Work with MongoDB and Oracle schemas and queries.
• Write unit and integration tests.
• Participate in code reviews and mentor juniors.
• Contribute to development process improvements.

Skills

Core Java

Spring Framework

Microservices

Reactive programming

Apache Kafka

MongoDB

Oracle SQL

RESTful APIs

JUnit Mockito

OAuth 2.0 JWT

Security best practices

Tools

Docker

Kubernetes

CI/CD

Job description

Citigroup Inc. is seeking a Senior Java Backend Developer to modernize CitiDirect’s Payment architecture in Jersey City, NJ. You will design, develop, and maintain high-performance Java backend services, architect microservices with Spring and Spring Cloud, and implement event-driven systems with Kafka.

Required are 7+ years in Java, Spring expertise, microservices experience, and strong API security. Familiarity with Docker/Kubernetes and CI/CD is preferred.