MERN Full Stack Developer

Cleo Consulting Inc.; Toronto; On-site; CAD 125,000 - 150,000; Full time

Job summary

A consulting firm in Ontario is seeking a Senior Full Stack Software Developer to maintain and support the Ceres application built with the MERN stack. Responsibilities include resolving issues, implementing upgrades, and ensuring continuous availability. Ideal candidates should have over 7 years of full-stack experience, proficiency with the MERN technology stack, and a solid grasp of Agile methodologies. This role is based onsite in Toronto, with a contract running from January to March 2026.

Qualifications

• 7+ years full-stack developer experience with MERN technology stack.
• 4+ years of experience in developing and documenting build books.
• Experience in Agile software delivery environments.

Responsibilities

• Maintain and support the Ceres application ensuring it is continuously available.
• Respond to and resolve application issues based on user feedback.
• Identify technical upgrades for the application.

Skills

Full-stack development

MERN stack (MongoDB, Express, React, Node.js)

Agile software delivery

Technical documentation

IT security best practices

Tools

Azure DevOps

Git

Job description

Ministry: Ministry of Public and Business Service Delivery and Procurement

Organization: Land & Resources Cluster

Assignment: RQ09981 – Software Developer – Full Stack – Senior

Title: Software Developer – Full Stack

Start Date: 2026-01-05

End Date: 2026-03-31

Office Location: 40 St. Claire W, Toronto

# Business Days: 58.00

This position is listed as “Onsite”; the resource is expected to work 7.25 hours per calendar day between the standard wording hours of 8:00 AM and 5:00 PM (excluding lunch breaks) every Monday to Friday inclusive.

Must have:

• 7+ years full-stack developer experience, working with the specific MERN (MongoDB, Express, React, Node.js) technology stack.
• 4+ years developing and documenting build books for managing build and deployment of application releases
• Experience working in an Agile software delivery environment

Experience and Skill Set Requirements

|———————————|—————————-|
| Evaluation Criteria | Evaluation % Weightage |
| Mandatory Skills and Experience | 70% |
| Desirable Skills and Experience | 20% |
| Soft Skills and Experience | 10% |
| TOTAL | 100% |

Description

To respond to the priorities of the Government of Ontario through the passage of the Bill 5, Protect Ontario by Unleashing Our Economy Act 2025, the resource may be partially assigned to Bill 5 related projects or initiatives on an as needed basis.

Background:

• This Ceres application was launched in February 2023 for ministry users, to improve management of plant health data and enable timely access to critical information (present and historical), as well as efficient identification of pest threats. The requirement is to make sure that the CERES application is continuously available, while also enabling implementation of bug fixes, issue resolution or minor improvements, based on user feedback.
• We are looking for a senior full stack software developer who will be responsible for providing maintenance and support for the Ceres application. The Ceres application is built using MERN (MongoDB, Express, React, Node.js) technology stack and hosted on Azure OPS tenant. The work activities for Ceres Maintenance and Support will entail:
• Responding to and resolving any issues reported on the application and ensuring that the application is continuously available for use
• Identifying and prioritizing technical upgrades to keep the platform up to date, including upgrades to the components in the technology stack
• Bug Fixes and Improvements identified regarding the functionality of the application

Skills

Mandatory Skills and Experience

• 7+ years full-stack developer experience, working with the specific MERN (MongoDB, Express, React, Node.js) technology stack.
• 4+ years developing and documenting build books for managing build and deployment of application releases
• Technical documentation skills to ensure all technical documentation are sufficiently updated to ensure proper knowledge transfer
• Experience designing and delivering solutions which incorporate Accessibility for Ontarians with Disability Act (AODA)
• Experience working in an Agile software delivery environment
• Knowledge of IT security best practices and protocols (OAuth 2, SAML)

Desirable Skills and Experience

• Experience building and deploying cloud native solutions, ideally in Azure
• Experience working on Agricultural data collection and analysis applications
• Familiarity with relevant Government of Ontario Information and Technology Standards (GO-ITS)
• Experience in source control, DevOps, CI/CD, and related tools (Azure DevOps, Git)

Soft Skills and Experience

• Ability to work independently and work closely with other developers especially for system integration.
• Professional team player with ability to work collaboratively with other project team members.
• Analytical and problem-solving skills.
• Attention to detail
• Strong communication skills

Cleo Consulting is an equal opportunity employer (Minorities/Women/Veterans/Disabled)