Senior Java Engineer

K&K Global Talent Solutions INC.; Toronto; On-site; CAD 90,000 - 130,000; Full time

Job summary

This Toronto onsite Java Developer role is with one of our clients in Canada, focused on building high-quality Java applications, unit testing, and CI/CD integration. It requires strong Java expertise, Spring Boot, and adherence to clean code principles.

Responsibilities include implementing TDD, code reviews, and developing RESTful APIs, while collaborating with architects, analysts, and operations to deliver secure, scalable solutions.

Qualifications

• 5+ years of software development experience in Java.
• Experience with unit testing using JUnit and Mockito.
• Proficient in TDD and continuous testing practices.
• Strong knowledge of code quality and design patterns (SOLID).

Responsibilities

• Design, develop, and maintain high-quality Java applications.
• Write comprehensive unit tests and ensure test coverage.
• Apply TDD and participate in code reviews and pair programming.
• Build RESTful APIs and microservices using Spring Boot.
• Collaborate with architects, analysts, and operations to deliver solutions.
• Diagnose performance issues and ensure security standards.

Skills

Java

Spring Boot

JUnit & Mockito

TDD

Clean code & SOLID

Code reviews

REST APIs

Concurrency & multithreading

JVM performance

Tools

Maven/Gradle

Git

Jenkins

SonarQube

JaCoCo

Docker

Kubernetes

Bitbucket

Job description

This position is with one of our clients in Canada, who is actively hiring candidates to expand their teams.

Technology: SonarQube and JaCoCo

Location: Onsite (Toronto, ON)

Job Description-

• 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.

Nice to Have (Added Advantage):

• Experience using AI-assisted development tools (for example, GitHub Copilot) to accelerate coding and testing.
• Experience with AI-powered or automated unit test generation frameworks (for example, Diffblue Cover, EvoSuite, or similar) is a strong added advantage.
• Experience with integration, performance, and contract testing tools.
• Experience with containerization and orchestration technologies such as Docker and Kubernetes.
• Experience with cloud platforms such as AWS.
• Knowledge of security scanning tools such as SonarQube, JFrog Xray, or similar.
• Knowledge of the financial and insurance industries.

Note: Applicants for employment in Canada should possess work authorization which does not require sponsorship by the employer for a visa