Senior Java Developer / Technical Lead

We are looking for Senior Java Developer / Technical Lead for our client in Toronto, ON Job Title: Senior Java Developer / Technical Lead Job Location: Toronto, ON Job Type: Contract Pay Range: $55.00hr - $60.00hr Job Overview: Our client is seeking a Senior Java Developer / Technical Lead to design and deliver secure, scalable, and high-volume banking and payment applications. The role will lead the development of Java and Spring Boot microservices, REST APIs, event-driven services, batch-processing capabilities, and containerized workloads across cloud and enterprise platforms. The candidate will provide technical leadership across solution design, application development, code quality, testing, releases, production support, and engineering-team coordination. Key Responsibilities: Design and develop Java and Spring Boot microservices for banking, payments, alerts, account servicing, and customer-facing platforms. Build secure RESTful APIs and event-driven integrations using Kafka, RabbitMQ, IBM MQ, or JMS. Develop high-volume, low-latency, and resilient distributed services. Design batch and sub-batch processing for large datasets, including failure handling and recoverability. Implement data archival, restoration, synchronization, and migration capabilities. Design and optimize MongoDB and relational-database collections, schemas, indexes, and queries. Lead technical design, low-level design, development, testing, release, and production-support activities. Provide technical direction, code reviews, development standards, and mentoring to engineering teams. Migrate applications to OpenShift and Kubernetes-based container platforms. Develop and maintain CI/CD pipelines using Jenkins, Harness, GitHub, Maven, Gradle, and artifact repositories. Implement OAuth 2.0, TLS, encryption, and API-security controls. Develop automated tests using JUnit, Mockito, Cucumber, Selenium, JMeter, Gatling, WireMock, or comparable tools. Build dashboards and operational alerts using Splunk, Kibana, AppDynamics, Instana, or Datadog. Troubleshoot production issues by analyzing application logs, performance metrics, event flows, and database behavior. Collaborate with product owners, architects, QA, database, security, and DevOps teams. Drive application resiliency, performance improvement, cloud adoption, and engineering automation. Required Skills: Advanced Java and J2EE development experience. Strong experience with Spring Boot, Spring MVC, Spring Data, Spring Batch, and REST APIs. Experience with microservices and event-driven architecture. Hands-on experience with Kafka and at least one enterprise messaging technology. Strong experience with MongoDB and relational databases such as Oracle or PostgreSQL. Experience deploying applications to OpenShift, Kubernetes, AWS, or comparable cloud platforms. Strong understanding of API security, OAuth 2.0, TLS, and encryption. Experience with Jenkins, Maven, Gradle, GitHub, SonarQube, and CI/CD. Experience with automated unit, integration, behavioural, and performance testing. Production-support experience using enterprise monitoring and logging tools. Proven ability to lead technical delivery and coordinate engineering activities. Preferred Skills: Banking, payments, cards, digital wallets, alerts, or account-servicing experience. Experience with Cassandra, MariaDB, or other NoSQL platforms. Experience with Apigee or another API-management platform. Familiarity with AWS, Pivotal Cloud Foundry, or Google Cloud. Knowledge of Autosys and enterprise batch scheduling. AWS certification or another relevant cloud certification. Experience using AI-assisted software-development tools. Education: Bachelor s degree in Computer Science, Engineering, Information Technology, or a related field. == == 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.