Freelance Full Stack Developer Jobs in Windsor, ON

At KPMG in Canada, our people bring their unique perspectives to Canada’s most important challenges. Here, you can build momentum that reaches beyond our business, develop skills for the future, and take ownership of your career with support at every stage. Join a firm where your career can make a difference.

The Application Development team is seeking a Senior Full Stack Application Developer to support and evolve KPMG's Class Action Administration platform and related client-facing applications.

This role is responsible for the development, enhancement, support, and modernization of existing solutions while contributing to the design of a reusable and configurable application framework that can be leveraged across future client engagements. The successful candidate will work across the full software development lifecycle, balancing hands-on development, production support, cloud technologies, and collaboration with business, architecture, security, and delivery teams.

Application Development & Modernization

• Design, develop, test, and maintain enterprise web applications using modern Microsoft technologies
• Build front-end applications using React, Vite, TypeScript, and related technologies
• Develop scalable APIs, services, and backend components using C#, ASP.NET, and modern .NET technologies
• Create reusable application components, shared modules, and configurable features to support multiple Class Action engagements
• Translate business requirements into scalable, maintainable technical solutions
• Contribute to application architecture, modernization initiatives, and the evolution of a reusable Class Action application framework
• Promote development standards, reusable patterns, and maintainable design practices

Application Support & Operations

• Act as a key technical resource supporting Class Action Administration applications
• Support production and non-production environments, ensuring application stability and performance
• Troubleshoot and resolve application issues, operational incidents, and production defects
• Perform root cause analysis and implement corrective actions
• Participate in release management, deployment activities, upgrades, and technical debt remediation efforts

Security & Governance

• Apply secure development practices throughout the software development lifecycle
• Partner with Security and DevSecOps teams to address vulnerabilities and security findings
• Support application hardening, vulnerability remediation, and compliance requirements
• Ensure solutions align with KPMG development standards, security controls, and governance processes

Collaboration & Delivery

• Collaborate with business stakeholders, architects, developers, support teams, and delivery leads
• Participate in Agile planning, estimation, technical reviews, and delivery activities
• Contribute to technical documentation, knowledge transfer, and continuous improvement initiatives
• Support application delivery in accordance with established SDLC and operational processes

• Bachelor's degree in Computer Science, Software Engineering, Information Technology, or equivalent practical experience
• 5+ years designing, developing, and supporting enterprise web applications
• Strong full-stack development experience with React, TypeScript/JavaScript, C#, ASP.NET Core, .NET, and REST APIs
• Experience building responsive, accessible (WCAG-compliant) public-facing web applications and implementing Google reCAPTCHA or similar bot protection technologies
• Experience with SQL Server/Azure SQL, Azure Functions, and integrating enterprise services
• Experience developing and supporting applications in Microsoft Azure, including cloud-hosted solutions and CI/CD using Azure DevOps and/or GitHub
• Knowledge of authentication, authorization, Microsoft Entra ID (Azure AD), and secure software development practices
• Experience supporting production applications, troubleshooting complex issues, and contributing to application modernization initiatives
• Familiarity with Clean Architecture and building reusable front-end components
• Experience maintaining legacy applications using technologies such as .NET MVC, Bootstrap, jQuery, and Next.js
• Experience working in Agile environments with strong analytical, communication, and stakeholder management skills

This position requires written and oral fluency in English. The successful candidate will be required to support or collaborate with English-speaking colleagues or stakeholders nationally in our English speaking provinces while at KPMG.

KPMG Ontario Region Pay Range Information 

The expected base salary range for this position is $106,600 to $156,500 and may be eligible for bonus awards. The determination of an applicant’s base salary within this range is based on the individual’s location, skills & competencies, and unique qualifications. In addition, KPMG offers a comprehensive and competitive Total Rewards program. 

KPMG BC Region Pay Range Information  

The expected base salary range for this position is $106,600 to $156,600 and may be eligible for bonus awards. The determination of an applicant’s base salary within this range is based on the individual’s location, skills & competencies, and unique qualifications. In addition, KPMG offers a comprehensive and competitive Total Rewards program. 

Providing you with the support you need to be at your best

Integrity, we do what is right | Excellence, we never stop learning and improving | Courage, we think and act boldly | Together, we respect each other and draw strength from our differences | For Better, we do what matters

KPMG in Canada is a proud equal opportunities employer and we are committed to creating a respectful, inclusive and barrier-free workplace that allows all of our people to reach their full potential. A diverse workforce is key to our success and we believe in bringing your whole self to work. We welcome all qualified candidates to apply and hope you will choose KPMG in Canada as your employer of choice.

Adjustments and accommodations throughout the recruitment process

At KPMG, we are committed to fostering an inclusive recruitment process where all candidates can be themselves and excel. We aim to provide a positive experience and are prepared to offer adjustments or accommodations to help you perform at your best. Adjustments (informal requests), such as extra preparation time or the option for micro breaks during interviews, and accommodations (formal requests), such as accessible communication supports or technology aids, are tailored to individual needs and role requirements. You will have an opportunity to request an adjustment or accommodation at any point throughout the recruitment process. If you require support, please contact KPMG’s Employee Relations Service team by calling 1-888-466-4778.

AI Usage

Weembrace the use of artificial intelligence (AI) to enhance the candidate experience and streamline our recruitment processes. AI tools may help with organizing applications or surfacing relevant qualifications. However, no hiring decisions are made using AI. Every hiring decision is made by our hiring managers and recruitment professionals, who are equipped with training that empowers them to use these tools responsibly. AI technologies used in our recruitment process undergo detailed risk assessments, including security and privacy requirements, that align with KPMG’s Trusted AI framework.

We believe technology should empower human judgment, not replace it. It’s one of the many ways we’re delivering on our vision of being a technology-first, people-driven firm.

• Bachelor's degree in Computer Science, Software Engineering, Information Technology, or equivalent practical experience
• 5+ years designing, developing, and supporting enterprise web applications
• Strong full-stack development experience with React, TypeScript/JavaScript, C#, ASP.NET Core, .NET, and REST APIs
• Experience building responsive, accessible (WCAG-compliant) public-facing web applications and implementing Google reCAPTCHA or similar bot protection technologies
• Experience with SQL Server/Azure SQL, Azure Functions, and integrating enterprise services
• Experience developing and supporting applications in Microsoft Azure, including cloud-hosted solutions and CI/CD using Azure DevOps and/or GitHub
• Knowledge of authentication, authorization, Microsoft Entra ID (Azure AD), and secure software development practices
• Experience supporting production applications, troubleshooting complex issues, and contributing to application modernization initiatives
• Familiarity with Clean Architecture and building reusable front-end components
• Experience maintaining legacy applications using technologies such as .NET MVC, Bootstrap, jQuery, and Next.js
• Experience working in Agile environments with strong analytical, communication, and stakeholder management skills

This position requires written and oral fluency in English. The successful candidate will be required to support or collaborate with English-speaking colleagues or stakeholders nationally in our English speaking provinces while at KPMG.

KPMG Ontario Region Pay Range Information 

The expected base salary range for this position is $106,600 to $156,500 and may be eligible for bonus awards. The determination of an applicant’s base salary within this range is based on the individual’s location, skills & competencies, and unique qualifications. In addition, KPMG offers a comprehensive and competitive Total Rewards program. 

KPMG BC Region Pay Range Information  

The expected base salary range for this position is $106,600 to $156,600 and may be eligible for bonus awards. The determination of an applicant’s base salary within this range is based on the individual’s location, skills & competencies, and unique qualifications. In addition, KPMG offers a comprehensive and competitive Total Rewards program. 

Providing you with the support you need to be at your best