Senior.NET Developer

Cognizant’s Application Delivery practice seeks a highly qualified .NET Developer (Onsite) with experience developing and building high‑performing, scalable, enterprise applications. You will be part of a digital software team that works on high‑demand applications. Our engineers have a passion for high‑quality, reliable and maintainable code. You will work side by side with product managers, designers, and clients, making decisions together in order to quickly deliver valuable working software to clients and their users. Our engineers are agile and retrospective, and not afraid to identify what we’re doing wrong, so we can fix it, and what we’re doing right, so we can improve on it. Above all, we judge success by the success of our team and the happiness of our customers.

Location : Toronto, ON

Experience Required : 6+ years

You must be legally authorized to work in Canada without the need for employer sponsorship, now or at any time in the future.

Cognizant will not sponsor work authorization for this role.

Roles & Responsibilities

• Design, develop, and maintain server‑side components using C# and .NET (Core/Framework) following clean architecture and SOLID principles.
• Build and maintain RESTful APIs (design, versioning, pagination, error handling, and documentation) and ensure secure authentication/authorization.
• Develop middleware and integration components to connect internal services with external systems (message formats, adapters, routing, transformation, and orchestration).
• Implement and consume integrations using common patterns (sync/async), ensuring resiliency (timeouts, retries, circuit breakers) and observability (logging, tracing, metrics).
• Write unit/integration tests and support automated CI/CD pipelines; ensure code quality through reviews and static analysis.
• Troubleshoot production issues, perform root‑cause analysis, and deliver performance/reliability improvements.
• Collaborate with product owners, architects, and QA to refine requirements, estimate work, and deliver features within sprint timelines.
• Produce and maintain technical documentation for APIs, integrations, configuration, and runbooks.

Required Qualifications

• MUST Have skills : C#, .NET, server‑side development, REST APIs, middleware integration.
• Nice‑to‑have skills : relational databases, MongoDB, Redis.

Salary and Other Compensation

The annual salary for this position is between CAD 80,000 – CAD 91,000 base, depending on experience and other qualifications of the successful candidate.

This position is also eligible for Cognizant’s discretionary annual incentive program, based on performance and subject to the terms of Cognizant’s applicable plans.

Applications will be accepted until June 15th, 2026.

Benefits

• Medical/Dental/Vision/Life Insurance
• Paid holidays plus Paid Time Off
• Long‑term/Short‑term Disability
• Paid Parental Leave

Travel : 0‑5%

Cognizant is an equal‑opportunity employer. All qualified applicants will receive consideration for employment without regard to sex, gender identity, sexual orientation, race, color, religion, national origin, disability, protected Veteran status, age, or any other characteristic protected by law.