Senior Full Stack Engineer

Job Description

Job DescriptionRole: Senior Full Stack EngineerLocation: Toronto, ONTerms: Full TimeJob DescriptionRoles and Responsibilities:

• Design, develop, and maintain high-quality, maintainable Java applications and services 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) and continuous testing practices to drive design, maximize coverage, and prevent regressions.
• Build modular, reusable, and testable applications and APIs (REST web services) in Java.
• Embed security-by-design throughout the development life cycle, following secure coding standards and addressing vulnerabilities early.
• 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, security scanning, 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.
• 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, security, and reliability issues.
• Stay current with emerging technologies, including AI-assisted development and developer experience platforms, and evaluate how they can improve quality and productivity.

Skills Required:

• 5 years of software development experience in Java / NodeJs, spanning the full application development life cycle.
• Experience with modern UI technologies (for example, React, Angular, TypeScript, JavaScript, HTML5, CSS) is preferred.
• 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.
• Working knowledge of secure coding practices and application security fundamentals (for example, the OWASP Top 10).