Senior Java Engineer

Role :: Senior Java Engineer Location :: Toronto, ON– Onsite Fulltime_ Permanent Role Job Description Roles and Responsibilities: • Design, develop, and maintain high-quality, maintainable Java applications using clean code principles and established design patterns. • Write comprehensive, meaningful unit tests using JUnit and Mockito to ensure code correctness, reliability, and long-term maintainability. • Apply test-driven development (TDD) practices to drive design, maximize coverage, and prevent regressions. • Champion code quality through thorough code reviews, pair programming, and adherence to coding standards and best practices. • Refactor and improve existing codebases to reduce technical debt and enhance readability, performance, and testability. • Apply core Java concepts—collections, concurrency and multithreading, generics, streams, exception handling, and JVM memory management—to build robust solutions. • Integrate automated unit testing, static code analysis, and quality gates into CI/CD pipelines. • Use tools such as SonarQube and JaCoCo to measure, enforce, and continuously improve code quality and test coverage. • Build modular, reusable, and testable applications and APIs (REST web services) in Java. • Collaborate with architects, business and application analysts, operations teams, and testing specialists to deliver reliable, secure, high-quality solutions. • Diagnose, troubleshoot, and resolve complex technical, performance, and reliability issues. • Ensure information security standards and requirements are incorporated into all solutions. • Stay current with emerging technologies, including AI-assisted development and automated test generation, and evaluate how they can improve quality and productivity. Skills Required: • 5+ years of software development experience in Java, spanning the full application development life cycle. • Strong command of core Java concepts, including collections, concurrency/multithreading, generics, streams, lambdas, exception handling, and JVM memory management. • Proven, hands-on experience writing effective unit tests with JUnit and mocking frameworks such as Mockito. • Solid understanding of test-driven development (TDD), test automation, and continuous testing practices. • Deep commitment to code quality, clean code, SOLID principles, and design patterns. • Experience with static code analysis and code coverage tools such as SonarQube and JaCoCo. • Experience building RESTful APIs and microservices using frameworks such as Spring / Spring Boot. • Experience with build tools such as Maven or Gradle. • Experience with source code management tools such as Git and Bitbucket. • Experience integrating automated tests and quality checks into CI/CD pipelines (for example, Jenkins). • Strong analytical, problem-solving, communication, and technical documentation skills. • Ability to work effectively in a fast-paced, cross-functional Agile environment.