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Added 28 mins ago
Front End Developer
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Full-time
Architecture: Maintain Single Page Applications (SPAs) with modern React patterns, Hooks, and Context API.
Added 28 mins ago
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Added 29 mins ago
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Added 29 mins ago
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Added 43 mins ago
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Added 43 mins ago
Frontend Developer with specialized skills in Nginx web servers, DevOps, API integration, and secure banking-grade authentication.
Apptoza Inc.
Toronto, ON
Contract
Architecture: Maintain Single Page Applications (SPAs) with modern React patterns, Hooks, and Context API.
Added 43 mins ago
Frontend Developer with strong Nginx, DevOps, API integration, and authentication/security experienc
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Added 43 mins ago
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Added 1 hour ago
Intermediate Full Stack Developer
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We are currently seeking an Intermediate Full Stack Developer to join our growing team. Reporting to the Data Strategy Manager, this role is responsible for developing and maintaining…
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Full-stack programming experience with React/Angular and Python Flask.
Added 1 hour ago
Java Fullstack
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Mississauga, ON
$100,000 CAD / year
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Added 1 hour ago
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Added 1 hour ago
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Continually evaluate and react to performance issues and actively recruit candidates.
Added 1 hour ago
Python Developer
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Hiring: Senior Python Developer (AWS | REST APIs | CI/CD)
Added 1 hour ago
Full Stack .NET Developer
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Added 1 hour ago
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Okta
Toronto, ON
$160,000 to $220,000 CAD / year
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…consumers. You think about backward compatibility, versioning, and developer experience as first-class…
Added 1 hour ago
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Full-time
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Added 1 hour ago
Senior Java Software Engineer
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Toronto, ON
Full-time

AceStack

Senior Full Stack Engineer / Toronto, ON (Onsite) - FTE

Toronto, ON, Canada

Job type: Part-time
Apply by: Oct 29, 2026
Experience: 5+ years of professional software development experience with strong expertise in Java and/or Node.js across the full software development lifecycle.
Posting language: English
Posted: Sep 29, 2026

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Original job description

Role: Senior Full Stack Engineer

Location: Toronto, ON

Work Arrangement: Onsite

Role Overview

We are seeking a Senior Full Stack Engineer with strong hands-on experience in Java, Spring Boot, REST APIs, microservices, automated testing, and modern software engineering practices. The ideal candidate will have a strong focus on clean code, TDD, code quality, application security, CI/CD, and scalable application development, along with exposure to modern UI and AI-assisted development technologies.

Key Responsibilities

Design, develop, test, and maintain scalable, secure, and high-quality Java applications, APIs, and microservices.
Apply clean code principles, SOLID principles, design patterns, and software engineering best practices.
Develop RESTful web services and backend applications using Java, Spring, and Spring Boot.
Build modular, reusable, maintainable, and highly testable application components.
Develop comprehensive unit and automated tests using JUnit and Mockito.
Apply Test-Driven Development (TDD) and continuous testing practices to improve quality and prevent regressions.
Leverage core Java concepts including collections, generics, streams, lambdas, exception handling, concurrency, multithreading, and JVM memory management.
Conduct code reviews, participate in pair programming, and enforce coding standards and engineering best practices.
Refactor legacy code and reduce technical debt while improving readability, performance, maintainability, and testability.
Implement security-by-design practices throughout the software development lifecycle.
Apply secure coding practices and address application vulnerabilities in accordance with OWASP and industry standards.
Integrate unit testing, static code analysis, code coverage, security scanning, and quality gates into CI/CD pipelines.
Use tools such as SonarQube and JaCoCo to monitor and continuously improve code quality and test coverage.
Work with Maven or Gradle, Git, Bitbucket, and Jenkins as part of the development and delivery lifecycle.
Diagnose and resolve complex technical, performance, security, production, and reliability issues.
Collaborate with architects, business analysts, application analysts, QA/testing teams, and operations teams in a cross-functional Agile environment.
Contribute to technical documentation, architecture discussions, design reviews, and continuous engineering improvements.
Evaluate and adopt emerging technologies, including AI-assisted development and developer experience platforms, where they provide measurable engineering value.

Required Skills & Experience

5+ years of professional software development experience with strong expertise in Java and/or Node.js across the full software development lifecycle.
Strong hands-on experience with Core Java, including:
Collections
Generics
Streams & Lambdas
Exception Handling
Concurrency & Multithreading
JVM Memory Management
Strong experience developing RESTful APIs and microservices using Spring/Spring Boot.
Hands-on experience writing effective unit tests using JUnit and Mockito or equivalent mocking frameworks.
Strong understanding and practical application of TDD, test automation, and continuous testing.
Strong knowledge of Clean Code, SOLID principles, design patterns, refactoring, and code quality practices.
Experience with SonarQube, JaCoCo, static code analysis, code coverage, and security scanning.
Experience with Maven or Gradle for build and dependency management.
Strong experience with Git and Bitbucket.
Experience integrating automated testing and quality/security gates into CI/CD pipelines, preferably using Jenkins.
Working knowledge of secure coding practices and OWASP Top 10.
Experience with modern frontend technologies such as React, Angular, TypeScript, JavaScript, HTML5, and CSS is preferred.
Strong analytical, troubleshooting, problem-solving, communication, and technical documentation skills.
Ability to work effectively in a fast-paced, Agile, cross-functional environment.

Nice to Have / Preferred Skills

Experience with Node.js and backend JavaScript/TypeScript development.
Experience with AI-assisted development tools, such as GitHub Copilot.
Exposure to AI agents, agentic development workflows, or AI-powered developer tooling.
Experience with Backstage or other developer portal/platform technologies.
Experience designing and maintaining CI/CD pipelines and developer tooling.
Experience with Docker and Kubernetes.
Experience with AWS or other cloud platforms.
Experience with Jira, Confluence, and Agile delivery methodologies.
Experience with modern developer experience and engineering productivity platforms.
University Degree or College Diploma in Computer Science, Engineering, or a related technology discipline.

Key Technical Keywords

Java, Core Java, Spring Boot, Spring, REST APIs, Microservices, JUnit, Mockito, TDD, Test Automation, Clean Code, SOLID, Design Patterns, SonarQube, JaCoCo, Maven, Gradle, Git, Bitbucket, Jenkins, CI/CD, OWASP, Secure Coding, React, Angular, TypeScript, JavaScript, Node.js, Docker, Kubernetes, AWS, Backstage, GitHub Copilot, AI Agents, Agile.

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More about this job

Responsibilities

Design, develop, test, and maintain scalable, secure Java applications, REST APIs, and microservices, applying clean code, TDD, automated testing, and secure engineering practices. Improve code quality and delivery pipelines, troubleshoot complex issues, and collaborate with cross-functional Agile teams on architecture, documentation, and engineering improvements.

Requirements

Requires 5+ years of software development experience, strong Java and Spring Boot expertise, and practical experience with REST APIs, microservices, automated testing, TDD, and CI/CD quality gates. Candidates should also know secure coding and OWASP practices, build tools, Git, and code-quality tools; frontend experience is preferred, while a related university degree or college diploma is listed as a preferred qualification.

Skills

Java
Spring Boot
REST APIs
Microservices
JUnit
Mockito
Test-Driven Development
Clean Code
SOLID Principles
SonarQube
CI/CD
Secure Coding
Git
Jenkins
React
Node.js

Visa sponsorship

Not detected in the job text

Keywords

Java
Core Java
Spring
Spring Boot
REST APIs
Microservices
JUnit
Mockito
Test-Driven Development
Test Automation
Clean Code
SOLID Principles
Design Patterns
SonarQube
JaCoCo
Maven
Gradle
Git
Bitbucket
Jenkins
CI/CD
OWASP
Secure Coding
React
Angular
TypeScript
JavaScript
Node.js
Docker
Kubernetes

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