CitiDirect Senior Java Dev for Payments Modernization – Vice President

Citibank (Switzerland) AG; Mississauga; Hybrid; Confidential; Full time

Job summary

Citibank (Switzerland) AG is seeking a Senior Java Backend Developer to join the Payments Modernization program in Mississauga. You will design, build, and scale backend services using Java, Spring Boot, and microservices, working within a hybrid Canada office model.

You will implement event-driven architectures with Kafka, work with MongoDB and Oracle, and mentor junior developers while advancing secure, robust, and high-performance solutions for CitiDirect payments platforms.

Qualifications

• 7+ years of Java development experience.
• Strong Spring Framework experience including Spring Boot and Spring Cloud.
• Proven track record in designing and implementing microservices architectures.
• Experience with reactive programming.
• Proficiency with Apache Kafka for event-driven systems.
• Solid MongoDB schema design and query optimization.
• Oracle databases and SQL with performance optimization.
• RESTful API design principles and secure coding practices.
• Experience with unit and integration testing (JUnit, Mockito).
• Knowledge of OAuth2/JWT security in microservices.

Responsibilities

• Design, develop, and maintain robust, scalable Java-based 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 practices.

Skills

Java development

Spring Framework

Spring Boot

Spring Cloud

Microservices

Apache Kafka

MongoDB

Oracle

RESTful APIs

Unit testing

Tools

JUnit

Mockito

Docker

Kubernetes

Job description

## CitiDirect Senior Java Dev for Payments Modernization – Vice PresidentApply: Hybrid: Mississauga Ontario Canada: Full time: Posted Today: 26987379Services is a leading provider of cash management, treasury, trade, clearing, depository receipts and commercial cards services. Services has a global network spanning more than 90 countries and is unique in the industry for its reach, interoperability, and flexibility. We provide clients with dynamic information, platforms, tools, and APIs to effectively manage their portfolios, financial positions, working capital and supply chains. CitiDirect serves as the unified digital gateway for clients to access our full suite of services.We are seeking an experienced Senior Java Backend Developer to join a group modernizing CitiDirect’s Payment architecture. The ideal candidate will have a strong foundation in Core Java and extensive experience with Spring Framework, microservices architecture, Apache Kafka, MongoDB, and Oracle databases.Key Responsibilities:* Design, develop, and maintain robust, scalable, and high-performance Java-based 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 the continuous improvement of our development processes and best practicesRequired Qualifications:* 7+ years of experience in Java development, with a strong command of Core Java concepts* Extensive experience with Spring Framework, including Spring Boot and Spring Cloud* Proven track record of designing and implementing microservices architecture* Experienced in Reactive programming* Proficiency in working with Apache Kafka, including designing and implementing event-driven systems* Strong experience with MongoDB, including schema design, complex queries, and performance optimization for large-scale applications* Solid understanding of NoSQL database concepts and best practices* Experience with Oracle databases and SQL, and performance optimization* Expertise in RESTful API design principles* Proficiency in writing unit and integration tests using frameworks like JUnit and Mockito* In-depth knowledge of application security principles and experience implementing secure coding practices* Expertise in implementing authentication and authorization in microservices architecture (OAuth 2.0, JWT etc.)Preferred Qualifications:* Familiarity with containerization technologies (e.g., Docker, Kubernetes)* Experience with CI/CD pipelines and DevOps practices* Understanding of Agile methodologies* Solid understanding of payments industry, including various payment systems and processes* Familiarity with ISO 20022 standards, and their application in payments messaging* Contributions to open-source projects