Senior Java Full Stack Developer

We are looking for Senior Java Full Stack Developer for our client in Toronto, ON Job Title: Senior Java Full Stack Developer Job Location: Toronto, ON Job Type: Contract Pay Range: $53.00hr - $58.00hr Job Overview: Our client is seeking a Senior Java Full Stack Developer to design and deliver scalable enterprise applications within a complex financial-services environment. The role will focus on Java and Spring Boot microservices, Angular or React user interfaces, REST APIs, Kafka-based event processing, cloud platforms, and containerized deployments. The candidate will build secure, high-volume applications and collaborate across architecture, product, quality engineering, DevOps, and support teams. Key Responsibilities: Design, develop, and enhance Java and Spring Boot microservices. Build responsive web interfaces using Angular or React. Develop secure and reusable RESTful APIs for enterprise integrations. Implement synchronous and event-driven integrations using REST and Apache Kafka. Support client, account, transaction, payment, and preference-processing workflows. Design services using microservices, event-driven, and domain-driven architecture principles. Develop automated unit, functional, integration, and performance tests. Create mock services and event simulators for end-to-end testing. Perform application performance testing and troubleshoot latency or throughput issues. Deploy and support applications on OpenShift, Kubernetes, or AWS container platforms. Develop and maintain CI/CD pipelines using Jenkins and GitHub Actions. Implement authentication and authorization using OAuth 2.0, JWT, Spring Security, and token-based access controls. Monitor distributed applications using Prometheus, Grafana, and application logs. Optimize MongoDB and PostgreSQL queries, indexes, and data-access patterns. Participate in Agile planning, design reviews, code reviews, production releases, and incident resolution. Identify application defects, security vulnerabilities, and opportunities for technical improvement. Required Skills: Strong hands-on development experience with Java 8 or later. Advanced experience with Spring Boot, Spring MVC, Hibernate, and microservices. Experience developing REST APIs and distributed backend services. Hands-on experience with Angular or React, JavaScript, TypeScript, HTML, and CSS. Experience with Apache Kafka and asynchronous message processing. Experience with PostgreSQL and MongoDB. Experience deploying applications using Docker, Kubernetes, or OpenShift. CI/CD experience with Jenkins, GitHub Actions, Git, Maven, or Gradle. Experience with OAuth 2.0, JWT, and Spring Security. Experience with JUnit, Postman, and performance-testing tools. Understanding of Agile delivery and the software development lifecycle. Preferred Skills: Experience with AWS services and EKS or ECS. Experience working within banking, payments, financial services, or another regulated industry. Familiarity with PCI-DSS-aligned application controls. Experience implementing Prometheus and Grafana monitoring. Exposure to fraud detection, anomaly detection, or risk analytics integrations. Knowledge of Redis and performance-testing tools such as JMeter. Education and Certifications: Bachelor s degree in Computer Science, Engineering, or a related field. AWS certification is considered an asset. == == Benefits Our Benefits Include: Medical, Dental, and Vision Insurance 401(k) Retirement Plan Health Savings Account (HSA) Disability Insurance (Short-Term and Long-Term) Life and AD&D Insurance Paid Sick Leave (where required by applicable state or local law) Supplemental Insurance Plans Identity Theft Protection Pet Insurance Employee Wellness Programs Employee Assistance Program (EAP) Career Growth and Professional Development Opportunities Disclaimer: Benefits eligibility, accrual rates, and usage limits may vary based on employment status, length of service, and work location. Paid Sick Leave is provided in strict accordance with applicable state and municipal mandates. Cynet Systems Inc. reserves the right to modify, amend, or terminate any benefit plans at any time in accordance with applicable laws. About Cynet Systems Founded in 2010 and headquartered in the Washington, DC metro area, Cynet Systems Inc. is a leading technology staffing and workforce solutions company serving Fortune 500 companies, government agencies, and enterprise organizations across the United States and Canada. We deliver agile, scalable talent solutions across IT, engineering, life sciences, clinical, and professional staffing, powered by a high-performing recruitment engine operating across North America and Asia. As a nationally and locally certified Minority Business Enterprise (MBE), Cynet Systems is committed to helping organizations build high-performing teams while empowering professionals to grow rewarding careers. Our organization is certified to ISO 9001, ISO 14001, ISO 27001, and SOC 2 Type II standards, reflecting our commitment to quality, security, operational excellence, and customer success.