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Contract

J&M Group

Sr. .Net Developer

Toronto, ON, Canada

Job type: Contract
Apply by: Dec 30, 2026
Posting language: English
Posted: Jul 3, 2026

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Original job description

Must Have Skills

Core .NET Development
API Development
Testing & Quality Assurance
Security & Vulnerability Resolution
AI and Copilot Development

Responsibilities & Skill Requirements Core .NET Development

Proficiency in .NET Framework and .NET Core
Strong C# and ASP.NET expertise
Object-oriented design principles and SOLID principles
Design patterns (Singleton, Factory, Repository, Dependency Injection, etc.)
Entity Framework and LINQ proficiency

API Development

RESTful API design and development
ASP.NET Core Web API
API security best practices and authentication/authorization
Microservices architecture experience
Experience with API versioning and documentation (Swagger/OpenAPI)

Testing & Quality Assurance

Unit testing frameworks (NUnit, xUnit, MSTest)
Mocking frameworks (Moq, NSubstitute)

Security & Vulnerability Resolution

SAST (Static Application Security Testing) tool experience
DAST (Dynamic Application Security Testing) tool experience
Common vulnerability identification and remediation
Secure coding practices
Authentication and authorization implementation
Data protection and encryption

Additional Technical Skills

SQL Server and database design
GitHub version control
CI/CD pipelines and DevOps experience: Git Action, Ansible, or UCD
Cloud platforms experience (OpenShift/Azure preferred)
Agile/Scrum methodologies

AI and Copilot Development

AI-assisted development experience
AI-powered debugging and optimization

Key Competencies

Strong problem-solving and analytical skills
Excellent code quality and documentation standards
Strong communication and collaboration skills

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More about this job

Responsibilities

The Sr. .Net Developer will be responsible for core .NET development, including API design and development, as well as ensuring testing and quality assurance. The role also involves addressing security vulnerabilities and contributing to AI-assisted development.

Requirements

Candidates must have proficiency in .NET Framework and .NET Core, along with strong expertise in C# and ASP.NET. Experience with API development, testing frameworks, and security practices is also required.

Skills

Core .Net Development
API Development
Testing & Quality Assurance
Security & Vulnerability Resolution
AI and Copilot Development
C#
ASP.Net
Entity Framework
LINQ
RESTful API
Microservices
Unit Testing
SAST
DAST
SQL Server
GitHub

Visa sponsorship

Not detected in the job text

Keywords

Core .Net
API Development
Testing
Quality Assurance
Security
Vulnerability Resolution
AI
Copilot Development
C#
ASP.Net
Entity Framework
LINQ
RESTful API
Microservices
Unit Testing
SAST
DAST
SQL Server
GitHub
CI/CD
DevOps
Agile
Scrum
Cloud Platforms
OpenShift
Azure
Authentication
Authorization
Data Protection
Encryption

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