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.