Java Developer at Citigroup

Job description

We are seeking a talented and motivated Java Developer to join our core engineering team. In this role, you will design, develop, test, and maintain robust, high-performance, and scalable enterprise applications. You will collaborate closely with cross-functional teams, including product managers, architects, UI/UX designers, and DevOps engineers, to deliver high-quality software solutions that meet business requirements and technical standards. 2. Key Responsibilities Software Design & Development Design, build, and maintain scalable, reliable, and testable Java/J2EE applications and microservices. Write clean, maintainable, efficient, and well-documented code adhering to object-oriented programming (OOP) principles and SOLID design patterns. Design and implement RESTful APIs, SOAP services, and event-driven messaging systems. Optimize application performance, throughput, latency, and memory utilization. Architecture & System Integration Participate in architectural discussions and system design reviews. Integrate backend services with relational (e.g., PostgreSQL, Oracle, MySQL) and NoSQL (e.g., MongoDB, Cassandra, Redis) databases. Integrate enterprise systems with message brokers (e.g., Apache Kafka, RabbitMQ, IBM MQ). Ensure seamless integration with third-party APIs and microservice ecosystems. Testing & Quality Assurance Implement comprehensive automated unit and integration tests using frameworks such as JUnit, Mockito, and Testcontainers. Participate in peer code reviews to ensure adherence to software engineering standards, security practices, and quality metrics. Proactively identify bottlenecks, address bugs, and remediate security vulnerabilities. DevOps & Deployment Collaborate with DevOps teams to design and optimize Continuous Integration and Continuous Deployment (CI/CD) pipelines (e.g., Jenkins, GitLab CI, GitHub Actions). Package and deploy containerized applications using Docker and orchestrate them via Kubernetes/OpenShift. Monitor application health and system performance using observability tools (e.g., Prometheus, Grafana, ELK Stack, Splunk). 3. Required Qualifications & Skills Technical Skills Core Java & Frameworks: Strong proficiency in Java (Java 11 / 17 / 21) and Core Java concepts (Multithreading, Concurrency, Collections, Generics, Stream API). Hands-on experience with Spring Framework ecosystem (Spring Boot, Spring MVC, Spring Data JPA, Spring Security, Spring Cloud). Database Management & ORM: Solid understanding of relational database design, SQL indexing, and query optimization (PostgreSQL, Oracle, or MySQL). Experience with Object-Relational Mapping (ORM) tools (Hibernate, JPA, MyBatis). Familiarity with NoSQL databases (MongoDB, DynamoDB, Redis) is a plus. Microservices & API Design: Experience designing, securing, and implementing RESTful APIs (OpenAPI/Swagger) and Microservices architecture. Familiarity with API Gateways, Service Discovery, and Circuit Breaker patterns. Messaging & Event Streaming: Experience with message queues and event streaming platforms such as Apache Kafka, RabbitMQ, or ActiveMQ. Build Tools & Version Control: Experience with build and dependency management tools (Maven, Gradle). Proficiency with Git and modern branching workflows (Gitflow, trunk-based development). Professional & Educational Qualifications Education: Bachelor’s or Master’s degree in Computer Science, Software Engineering, Information Technology, or equivalent practical experience. Experience: 3+ years of professional software development experience in Java-based environments (Mid-level) or 5+ years (Senior-level). Problem Solving: Strong analytical, problem-solving, and algorithmic thinking capabilities. Communication: Excellent verbal and written communication skills with the ability to collaborate effectively across distributed teams. 4. Preferred / Nice-to-Have Skills Experience with cloud platforms (AWS, Azure, or Google Cloud Platform). Hands-on experience with containerization (Docker) and co