Java Server side Engineer

Job Description: Java Backend Engineer – Microservices & Kafka

Job Summary

We are looking for a skilled Java Backend Engineer to develop and maintain scalable backend services for mobile applications used by millions of American Express cardholders worldwide. The role focuses on building a Backend-for-Frontend (BFF) service layer , delivering high-performance APIs and seamless mobile experiences.

The ideal candidate should have strong backend engineering fundamentals, experience with microservices, REST APIs, Kafka, and databases, along with a passion for clean code, performance optimization, and solving complex technical challenges.

Key Responsibilities

• Design, develop, and maintain scalable server-side applications and microservices.
• Build and enhance REST APIs for mobile application service layers.
• Develop asynchronous, event-driven services using Kafka.
• Design and integrate SQL and NoSQL database solutions.
• Write clean, reusable, testable, and maintainable code.
• Refactor legacy applications and improve code quality and performance.
• Implement unit testing, debugging, and performance optimization.
• Participate in CI/CD pipelines, build automation, and continuous integration.
• Collaborate with product managers, designers, QA engineers, and other developers.
• Integrate existing backend services and contribute to technical design decisions.
• Identify opportunities to improve application reliability, scalability, and user experience.

Required Skills

• Strong experience in Java backend development and server-side application engineering.
• Hands-on experience with Microservices architecture .
• Strong knowledge of REST API development and integration .
• Experience with Apache Kafka and asynchronous processing.
• Experience working with SQL or NoSQL databases; exposure to both is preferred.
• Understanding of data structures, design principles, and standard backend engineering practices.
• Experience with unit testing, debugging, code refactoring, and performance tuning.
• Familiarity with build tools, CI/CD pipelines, and continuous integration.
• Strong problem-solving skills and the ability to work collaboratively in an agile environment.

Preferred Skills

• Experience with Kotlin.
• Familiarity with Gradle.
• Knowledge of GraphQL (GQL) and RAML.
• Experience developing Backend-for-Frontend (BFF) services for mobile applications.
• Exposure to legacy system integration and large-scale distributed applications.

Education Bachelor’s degree in Computer Science, Information Technology, or a related field, or equivalent practical experience.