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Intern Mern Stack Developer Jobs in Ontario (NOW HIRING)

Perseus Group

Software Developer Intern

Markham, ON

CA$22.50 - CA$27.50/hr

The Software Developer Intern works in a Scrum team to build high-performing, resilient, and ... Hands-on experience in full-stack development: * HTML5, TypeScript, JavaScript, stylesheets ...

Fortinet, Inc.

Software Developer

Ottawa, ON

CA$96K - CA$118K/yr

Web technologies including Websocket, WebRTC, WebAudio, HTTP/2 * Experience with MERN or LAMP stack ... engineering teams and product development groups. Our team culture emphasizes continuous learning ...

Kinaxis Inc.

Intern Developer, AI Solutions

Kanata, ON · Hybrid

CA$27.04 - CA$39.66/hr

About the team You would be joining a full-stack AI/ML team at Kinaxis responsible for delivering ... What you will do As an intern ML developer, you are passionate about shipping large-scale software ...

Kinaxis Inc.

Intern Developer, AI Solutions

Kanata, ON · Hybrid

CA$27.04 - CA$39.66/hr

About the team You would be joining a full-stack AI/ML team at Kinaxis responsible for delivering ... What you will do As an intern ML developer, you are passionate about shipping large-scale software ...

Fortinet

Software Developer

Ottawa, ON · On-site

CA$96K - CA$118K/yr

Web technologies including Websocket, WebRTC, WebAudio, HTTP/2 * Experience with MERN or LAMP stack ... engineering teams and product development groups. Our team culture emphasizes continuous learning ...

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Intern Mern Stack Developer information

What is an intern MERN stack developer?

Intern MERN Stack Developers are entry-level programmers who assist in building web applications using the MERN stack, which stands for MongoDB, Express.js, React.js, and Node.js. As interns, they work under the guidance of senior developers to gain hands-on experience in designing, developing, and deploying full-stack web applications. Their responsibilities typically include writing code, fixing bugs, collaborating with teams, and learning best practices in software development. This role is ideal for those looking to start a career in web development and gain practical experience with modern JavaScript technologies.

What types of projects and tasks can I expect to work on as an intern MERN stack developer?

As an Intern MERN Stack Developer, you will typically participate in projects that involve building and maintaining web applications using MongoDB, Express.js, React, and Node.js. Your daily tasks may include writing and testing code, fixing bugs, developing new features under the guidance of senior developers, and contributing to team meetings. You'll likely collaborate with designers, backend engineers, and QA testers, gaining exposure to the full software development lifecycle. This hands-on experience is valuable for building your technical skills and understanding industry-standard development workflows.

What are the key skills and qualifications needed to thrive as an intern MERN stack developer, and why are they important?

To thrive as an Intern MERN Stack Developer, you need a solid understanding of JavaScript, HTML, CSS, and the core components of the MERN stack: MongoDB, Express.js, React.js, and Node.js, often supported by relevant coursework or self-led projects. Familiarity with version control systems like Git, basic RESTful API development, and optionally cloud platforms or CI/CD tools is valuable. Strong problem-solving skills, eagerness to learn, and effective communication help you collaborate with teams and adapt to new tasks quickly. These skills are crucial for contributing to real-world projects, resolving development challenges, and growing into a proficient full-stack developer.

What is the difference between Intern Mern Stack Developer vs Junior Mern Stack Developer?

AspectIntern Mern Stack DeveloperJunior Mern Stack Developer
Experience LevelEntry-level, internshipEntry to early professional experience
ResponsibilitiesAssisting in development tasks, learning, supporting senior developersDeveloping features, fixing bugs, contributing to projects
Skills & CertificationsBasic knowledge of MERN stack, learning mindsetProficiency in MongoDB, Express.js, React, Node.js, some certifications
Work EnvironmentInternship programs, training-focusedFull or part-time roles in tech teams

The main difference between an Intern Mern Stack Developer and a Junior Mern Stack Developer lies in experience and responsibilities. Interns are typically students or beginners gaining hands-on experience, while Junior developers have some practical skills and contribute more independently. Intern roles focus on learning and support, whereas Junior roles involve active development and problem-solving.

What are the most commonly searched types of Mern Stack Developer jobs in Ontario?

The most popular types of Mern Stack Developer jobs in Ontario are:

What are popular job titles related to Intern Mern Stack Developer jobs in Ontario?

For Intern Mern Stack Developer jobs in Ontario, the most frequently searched job titles are:

What job categories do people searching Intern Mern Stack Developer jobs in Ontario look for?

The top searched job categories for Intern Mern Stack Developer jobs in Ontario are:

What cities in Ontario are hiring for Intern Mern Stack Developer jobs?

Cities in Ontario with the most Intern Mern Stack Developer job openings:

Intern Mern Stack Developer jobs near you
Infographic showing various Intern Mern Stack Developer job openings in Ontario as of September 2026, with employment types broken down into 23% Internship, 45% Full Time, 16% Part Time, and 16% Contract. Highlights an 77% In-person, and 23% Remote job distribution.

Software Developer Intern

Markham, ON

Perseus Group
Apparel and Accessories Stores • 1 - 10 employees
Learn more about Perseus Groupexternal

CA$22.50 - CA$27.50/hr

Full-time

Re-posted 24 days ago

Job description

THE POSITION

The successful Software Developer Intern works in our Markham, Ontario office and reports to our Solutions Architect for the homebuilding industry's leading-edge enterprise software product.

The Software Developer Intern works in a Scrum team to build high-performing, resilient, and manageable web-based ERP software for homebuilders, using AI-assisted development throughout the SDLC. Responsibilities include:

  • Study and understand the application's functionality, workflow, and design.
  • Work with the team to build a new product module end-to-end using AI-assisted development tools under architectural guidance.
  • Assist in setting up, testing, and maintaining MCP servers/connectors that power AI-assisted development for the team, including configuration, documentation, and usage governance.
  • Expand automated test coverage - unit, integration, and end-to-end (Playwright) - and wire tests into Azure DevOps CI/CD pipelines.
  • Author and refine reusable AI context: rules files, prompts, and agentic workflows for repeatable development and review tasks.
  • Evaluate the quality and reliability of AI-assisted output against real coding tasks; iterate to improve.
  • Document processes and provide recommendations for scaling AI-assisted development and automation across the team.

QUALIFICATIONS AND SKILLS

  • Able to work from the Markham, Ontario office.
  • Understanding of software requirements and the software development lifecycle.
  • Experience building multi-tier, distributed web solutions with an emphasis on Responsive Design.
  • Understanding of development best practices in a multi-developer team using a shared code repository (Git): branching, pull requests, code review.
  • Hands-on experience in full-stack development:
    • HTML5, TypeScript, JavaScript, stylesheets (Angular an asset)
    • .NET
    • SQL query
    • Object-Oriented Design
    • Test-Driven Development; ability to write unit and integration tests
  • Familiarity with AI coding assistants and prompt engineering (asset).
  • Exposure to test automation frameworks such as Playwright (asset).
  • Exposure to Azure DevOps (Repos, Pipelines) (asset).

Salary Range (Ontario & BC Only):

The estimated base salary range for this role is CAD$22.50 - CAD$27.50 per hour. We include salary ranges in job postings only where required by applicable pay transparency laws, based on the jurisdictions in which the role may be performed. The posted range is a good faith estimate and reflects factors that are subject to change. Final offer amounts may vary based on job-related factors, including work location, candidate experience and expertise, and other relevant considerations.We recognize the value and importance of diversity and inclusion in our communities and in the workplace. We celebrate diversity and one of our goals as an employer is to create an inclusive work environment for all employees. We are an equal opportunity employer and do not discriminate against any employee or applicant because of race, religion, sex, sexual orientation including gender identity or expression, pregnancy, national origin, age, marital status, veteran status, disability status, or any other category or characteristic protected by law.Applicants with disabilities who would like to require a reasonable accommodation related to any part of the application process may contact us at Perseus_HR@constellationhbs.com.#NX

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