Our client in the banking/payments sector is seeking a contract based Core Java developer to work on their payments platform.Duration: 12 monthsLocation: hybrid Toronto (up to 3d/week)Key Responsibilities:Design, develop, and maintain high-performance, scalable, and secure Core Java applications for payments/e-Transfer platform.Build and enhance microservices architectures to ensure reliability and scalability for on-premises systems.Implement enterprise-grade solutions using the Spring Framework (Spring Boot, Spring Data, Spring Cloud).Collaborate with cross-functional teams to gather and analyze requirements, ensuring alignment with business and technical objectives.Ensure seamless integration of on-premises payment systems with internal services while maintaining robust transaction processing.Troubleshoot, debug, and resolve production issues, ensuring high availability of the e-Transfer system.Write clean, efficient, and well-documented code adhering to best practices and security standards.Participate in code reviews, mentor junior developers, and contribute to a culture of technical excellence.Optimize system performance and reliability through proactive monitoring and tuning.Requirements:8+ years of experience in Core Java development.Expertise in Spring Framework (Spring Boot, Spring Data, Spring Cloud) and building microservices architectures.Solid understanding of software development lifecycle (SDLC) in on-premises environments.Familiarity with databases (e.g., SQL, NoSQL) and database integration in Java applications.Exposure to payment systems or financial services is highly desirable.Experience with payment gateways or e-Transfer systems ideal.Knowledge of secure coding practices and transaction processing in an on-prem environment.Proficiency with CI/CD pipelines, version control (e.g., Git), and containerization tools (e.g., Docker, Kubernetes).Strong problem-solving skills and the ability to work both independently and collaboratively.Excellent communication skills, with the ability to articulate technical concepts to non-technical stakeholders.