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Junior Mern Stack Developer Jobs in Ontario (NOW HIRING)

Arcadion

Junior AI Developer

Ottawa, ON · On-site

About Arcadion Arcadion is a leading full-stack enterprise IT services and AI development firm ... We are looking for a Junior AI Developer to join our in-house team at our Ottawa headquarters. This ...

Scotiabank

Junior Software engineer

Toronto, ON · On-site

The Role Scotiabank is looking for a motivated and enthusiastic Junior Full Stack Developer (Level 6) to join our growing engineering team. We are seeking someone who is passionate about technology ...

Intuit

Staff Software Developer, Full Stack

Toronto, ON · Hybrid

CA$164K - CA$222K/yr

This engineer should be full-stack and prepared to work at all levels of the application. They will ... Coach and mentor junior engineers on best practices of software engineering, leveraging AI to ...

Emterra Group

AI - Full Stack Engineer

Oakville, ON · On-site

$120K/yr

Mentor junior team members and promote AI literacy across the IT team and business stakeholders ... Solid understanding of DevOps practices and Azure DevOps or GitHub Actions * Experience with ...

Citi

Full Stack Java Developer

Mississauga, ON · Hybrid

CA$79K - CA$110K/yr

Citi is looking for a Full Stack Java Developer to join its Technology team and play a meaningful ... Coach and support junior analysts, sharing technical knowledge and contributing to team capability ...

GLOBE TAX SERVICES INCORPORATED

... a Junior C# / .NET Developer to join our agile development team and help build and maintain ... Opportunity to expand into analytics, backend services, or full stack development Accommodations

Solace Corporation

Software Developer (Junior)

Kanata, ON · On-site

CA$85K - CA$105K/yr

About the Role This position is for a Junior Software Developer to join our API & Applications team ... Proven experience across the development stack including front-end, back-end and pipeline exposure

StackandCo

Net Software Developers (junior, mid and senior level roles) for an exciting and rapidly expanding ... They have exciting projects, cutting edge tech stack and an overall superb working environment. \n ...

Fortinet, Inc.

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 ...

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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Junior Mern Stack Developer information

See Ontario salary details

$36K

$124.3K

$179K

How much do junior mern stack developer jobs pay per year?

As of Sep 4, 2026, the average yearly pay for junior mern stack developer in Ontario is $124,267.00, according to ZipRecruiter salary data. Most workers in this role earn between $100,500.00 and $148,000.00 per year, depending on experience, location, and employer.

What is a junior MERN Stack Developer?

A Junior MERN Stack Developer is an entry-level software developer who specializes in building web applications using the MERN stack, which consists of MongoDB, Express.js, React, and Node.js. They assist in developing, testing, and maintaining both front-end and back-end components of web applications. Typical responsibilities include writing clean code, fixing bugs, collaborating with senior developers, and integrating APIs. Strong foundational knowledge of JavaScript, database management, and version control (e.g., Git) is essential. This role is ideal for individuals looking to gain hands-on experience and grow their skills in full-stack development.

What kind of projects or tasks might a junior MERN Stack Developer typically work on?

As a Junior MERN Stack Developer, you will often be involved in building and maintaining web applications, implementing new features, and fixing bugs within the application stack. Your day-to-day work may include writing code for both front-end (using React.js) and back-end (using Node.js and Express), working with databases like MongoDB, and collaborating closely with other developers, designers, and project managers. You may also be asked to participate in code reviews, contribute to team discussions on architecture or user experience, and learn best practices for scalable and maintainable code. This hands-on experience helps you develop your technical skills and prepares you for more advanced responsibilities as your career progresses.

What are the key skills and qualifications needed to thrive in the junior MERN Stack Developer position, and why are they important?

To thrive as a Junior MERN Stack Developer, you need a solid understanding of JavaScript, React.js, Node.js, Express, and MongoDB, typically supported by a relevant degree or coding bootcamp. Familiarity with version control systems like Git, Agile development practices, and basic knowledge of RESTful APIs are highly valued, while certifications in web development can enhance your candidacy. Strong problem-solving abilities, good communication skills, and a willingness to learn enable effective collaboration and growth in this role. These skills and qualities are essential for building efficient web applications and contributing successfully to dynamic development teams.

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 Junior Mern Stack Developer jobs in Ontario?

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

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

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

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

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

Junior Mern Stack Developer jobs near you
Infographic showing various Junior Mern Stack Developer job openings in Ontario as of August 2026, with employment types broken down into 82% Full Time, 12% Part Time, 5% Contract, and 1% Nights. Highlights an 86% Physical, 3% Hybrid, and 11% Remote job distribution, with an average salary of $124,267 per year, or $59.7 per hour.

Junior AI Developer

Arcadion

Ottawa, ON • On-site

Full-time

Re-posted 4 hours ago

Key responsibilities

  • Support the design, development, testing, and deployment of AI and machine learning applications.

  • Assist in building, testing, and fine-tuning large language models and retrieval-augmented generation (RAG) pipelines.

  • Contribute to prompt engineering, integration of LLMs into applications, and support data preprocessing and API integrations.

Job description

About Arcadion

Arcadion is a leading full-stack enterprise IT services and AI development firm headquartered in Ottawa. We specialize in delivering cutting-edge solutions across cloud infrastructure, cybersecurity, digital transformation, and AI automation. Our AI division is at the forefront of building intelligent systems, enterprise AI agents, and next-generation tools using advanced language models (LLMs), RAG pipelines, and machine learning technologies.

We are looking for a Junior AI Developer to join our in-house team at our Ottawa headquarters. This is a full-time, on-site position offering a unique opportunity to work directly with senior engineers and the Director of AI on innovative projects that span across sectors like healthcare, finance, construction, robotics, and legal tech.


Role Overview

As a Junior AI Developer, you’ll support the design, development, testing, and deployment of AI and machine learning applications. You will contribute to real-world use cases involving custom LLM integrations, automation agents, document intelligence systems, and AI-enhanced enterprise tools.

Key Responsibilities

  • Work closely with the Director of AI on the development of AI agents, copilots, and intelligent automation tools
  • Assist in building, testing, and fine-tuning large language models and retrieval-augmented generation (RAG) pipelines
  • Contribute to prompt engineering and integration of LLMs into web-based or API-driven applications
  • Support data preprocessing, embedding, and vector database structuring (e.g., Pinecone, Weaviate)
  • Write clean, testable Python code and support REST API integrations
  • Participate in QA testing, performance benchmarking, and debugging AI system behavior
  • Stay updated on emerging tools, frameworks, and trends in the AI ecosystem
  • Collaborate with cross-functional teams including DevOps, cloud engineers, and UI/UX designers

✅ Requirements

  • Degree or diploma in Computer Science, AI/ML, Data Science, Software Engineering, or related discipline
  • Foundational knowledge in machine learning and NLP principles
  • Proficiency in Python and familiarity with ML libraries like scikit-learn, PyTorch, or TensorFlow
  • Understanding of APIs, JSON, Git-based version control, and cloud fundamentals
  • Excellent problem-solving skills and attention to detail
  • Willingness to work on-site full-time in our Ottawa office (this is not a hybrid or remote role)

Bonus Skills (Assets)

  • Exposure to LLMs such as OpenAI, Claude, Mistral, or LLaMA
  • Experience with LangChain, Hugging Face Transformers, or similar frameworks
  • Basic experience with vector databases or embedding models
  • Familiarity with Azure, AWS, or GCP
  • Interest in chatbot development or knowledge-based search applications

What You’ll Gain

  • Direct mentorship from experienced AI architects and our Director of AI
  • Access to real-world enterprise projects and hands-on development with production-grade models
  • Growth path toward senior AI engineering or solution architecture roles
  • An innovative and supportive team environment inside one of Ottawa’s leading IT firms
  • Competitive compensation and performance-based opportunities

Apply Now

If you're ready to kickstart your career in AI and want to be part of a forward-thinking team building real-world applications, we’d love to meet you.