Senior Software Engineer - .NET, C# & APIs

About the role

Capco is hiring a Senior Software Engineer with strong expertise in C#.NET, ASP.NET Core and API development for its Technology & Engineering practice in Toronto. You will design, develop, modernize and maintain enterprise applications and APIs that support business-critical client solutions, working with cross-functional teams and using modern practices including AI-assisted engineering tools.

Key responsibilities

• Design, develop and maintain scalable backend services and enterprise applications with C#.NET, ASP.NET Core and SQL Server.
• Build and integrate secure RESTful APIs, including authentication, authorization, data validation and error handling.
• Modernize existing applications, refactoring legacy code and improving performance and reliability.
• Collaborate on frontend development with React, Angular or similar JavaScript/TypeScript frameworks.
• Apply secure coding principles, including OAuth2 and JWT.
• Take part in code reviews, automated testing, troubleshooting and performance optimization.
• Support CI/CD pipelines, containerized deployments and development workflows with tools such as Docker.
• Work in Agile environments and share technical knowledge to improve development practices.

Required profile

• 8+ years of professional software engineering experience with strong hands-on C# and .NET development.
• Solid experience with ASP.NET Core, Web API and RESTful services, and backend architecture and object-oriented programming.
• Experience with SQL Server or comparable databases, including Entity Framework Core or Dapper.
• Experience with Git, code reviews, automated testing, CI/CD pipelines and Agile delivery.
• Strong problem-solving, troubleshooting and communication skills.

Required skills

• C#.NET, ASP.NET Core, RESTful APIs, SQL Server, Entity Framework Core or Dapper
• React, Angular or similar JavaScript/TypeScript frameworks
• OAuth2, JWT and application security principles
• Bonus: Azure or AWS, Docker, Kubernetes, Snowflake, Tailwind CSS, shadcn/ui, AI-assisted tools such as GitHub Copilot

What we offer

• Salary range of $118,000-$152,000 CAD, with possible annual discretionary bonus.
• Company-paid health, life and disability insurance from day 1.
• Registered RRSP with possible employer match, virtual health care and EFAP.
• Parental leave top-up, new parent gift, wellness support and business coach from day 1.