Senior Full Stack Engineer : Toronto, ON : Hybrid : FTE

Role: Senior Full Stack Engineer

Location: Toronto, ON

Work Model: Onsite

Experience: 5+ Years

Role Overview

We are seeking a Senior Full Stack Engineer with strong hands-on experience in Java, Spring Boot, REST APIs, microservices, unit testing, and software engineering best practices. The ideal candidate will have a strong focus on clean code, test-driven development, application security, code quality, and CI/CD automation, with exposure to modern frontend and cloud technologies.

Key Responsibilities

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Design, develop, test, and maintain scalable Java applications, REST APIs, and microservices using clean code principles and established design patterns.

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Develop modular, reusable, maintainable, and highly testable software components.

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Write comprehensive unit tests using JUnit and Mockito and drive high-quality test coverage.

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Apply Test-Driven Development (TDD) and continuous testing practices to improve reliability and prevent regressions.

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Apply strong knowledge of Core Java, including collections, generics, streams, lambdas, concurrency, multithreading, exception handling, and JVM memory management.

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Develop and maintain backend services using Spring/Spring Boot and RESTful API technologies.

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Follow secure coding practices and incorporate security-by-design principles throughout the software development lifecycle.

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Conduct code reviews, participate in pair programming, and enforce coding standards, SOLID principles, clean code, and design patterns.

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Refactor legacy code and reduce technical debt while improving application performance, maintainability, and testability.

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Integrate automated testing, static code analysis, code coverage, and security scanning into CI/CD pipelines.

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Use tools such as SonarQube and JaCoCo to monitor and continuously improve code quality and test coverage.

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Work closely with architects, business/application analysts, QA, operations, and other cross-functional teams in an Agile environment.

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Troubleshoot and resolve complex application issues related to functionality, performance, security, and reliability.

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Contribute to CI/CD automation using tools such as Jenkins, Maven/Gradle, Git, and Bitbucket.

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Evaluate and adopt modern engineering practices, including AI-assisted development and developer experience tools, where they can improve productivity and software quality.

Required Skills & Experience

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5+ years of professional software development experience with Java and/or Node.js across the full software development lifecycle.

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Strong hands-on expertise in Core Java, including:

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Collections and Generics

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Streams and Lambdas

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Concurrency and Multithreading

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Exception Handling

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JVM memory management

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Strong experience with Spring/Spring Boot, REST APIs, and microservices.

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Proven experience developing effective unit tests using JUnit and Mockito or equivalent mocking frameworks.

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Strong understanding of TDD, test automation, and continuous testing.

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Strong knowledge of Clean Code, SOLID principles, design patterns, refactoring, and code quality practices.

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Working knowledge of application security and secure coding practices, including OWASP Top 10.

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Hands-on experience with SonarQube, JaCoCo, or similar code-quality and coverage tools.

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Experience integrating automated testing, quality checks, and security gates into CI/CD pipelines, preferably using Jenkins.

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Experience with Maven or Gradle and source control tools such as Git and Bitbucket.

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Strong analytical, troubleshooting, problem-solving, communication, and technical documentation skills.

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Ability to work effectively in a fast-paced, cross-functional Agile/Scrum environment.

Frontend / Full Stack Experience

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Experience with modern UI technologies such as:

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React or Angular

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TypeScript / JavaScript

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HTML5 / CSS

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Backend experience with Node.js is an added advantage.

Nice-to-Have Skills

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Experience with AI-assisted development tools, such as GitHub Copilot.

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Exposure to AI agents and agentic software development workflows.

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Experience with Backstage or other developer portal/platform technologies.

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Strong experience building and maintaining CI/CD pipelines and developer tooling.

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Experience with Docker and Kubernetes.

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Experience with AWS or other cloud platforms.

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Experience with Jira and Confluence.

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Experience working with developer experience/platform engineering initiatives.

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Bachelor's degree or college diploma in Computer Science, Software Engineering, or a related technology discipline.

Key Technology Stack

Java | Spring Boot | REST APIs | Microservices | JUnit | Mockito | TDD | SonarQube | JaCoCo | Maven/Gradle | Git | Bitbucket | Jenkins | React/Angular | TypeScript | Node.js | Docker | Kubernetes | AWS | Backstage | GitHub Copilot