Top .NET Developer Jobs in Toronto

The role involves developing, testing, and maintaining software systems, collaborating with cross-functional teams, and mentoring junior developers while ensuring high code quality.

Design, develop, and maintain scalable .NET and React applications and secure RESTful APIs. Implement authentication/authorization (JWT, OAuth2), containerize with Docker, contribute to CI/CD, code reviews, and documentation, and responsibly use AI-assisted development tools to improve productivity and quality.

Develop and maintain full-stack .NET applications for the Securitization Technology team. Responsibilities include solution design, C# development, systems administration, testing, deployment support, incident management, performance improvements, security practices, monitoring, and troubleshooting. The role collaborates with business and technology stakeholders, contributes to project planning, provides technical leadership, and supports critical capital markets platforms in an Agile environment.

Develop, enhance, support, and troubleshoot enterprise applications and integrations using .NET, C#, SQL, ASP.NET, APIs, and modern software architectures. Contribute to DevOps, CI/CD, containerization, deployment automation, monitoring, security, testing, documentation, and production support. Collaborate with business and technical stakeholders to deliver scalable, secure, high-quality solutions across a diverse technology environment.

Lead design and development of scalable, cloud-native financial and reconciliation systems on GCP. Own architecture, drive technical decisions, mentor engineers, embed AI and automation, collaborate with product and QA, and ensure reliability, performance, and test automation.

Develop and optimize high-performance .NET Core and C# backend microservices in a large distributed system. Responsibilities include PostgreSQL optimization, service communication, observability, resilience patterns, CI/CD integration, deployment strategies, performance profiling, architecture reviews, testing collaboration, and production troubleshooting. The role partners with DevOps, QA, and frontend teams to improve scalability, availability, and maintainability.

Design, develop, test, deploy, and maintain scalable web applications using Angular, .NET, and SQL Server. Participate throughout the software development lifecycle, collaborate with developers, designers, and stakeholders, follow coding and security standards, improve development processes, and stay current with Angular and .NET technologies. The role also involves RESTful API development, Git source control, Agile methodologies, and potentially Java, Elasticsearch, and Kafka.

Develop and maintain C# APIs and web applications across modern .NET and legacy ASP.NET environments. Build integration solutions, modernize legacy systems, implement AI-assisted security monitoring, and maintain automated regression tests. Collaborate with client engineering teams on code reviews, CI/CD, and production releases while using AI development tools such as Claude Code.

Support C# and .NET applications hosted on AWS by troubleshooting production issues, delivering enhancements, managing CI/CD pipelines with GitHub Actions, overseeing deployments, renewing SSL/TLS certificates, maintaining operational stability, and implementing cloud cost-optimization initiatives.

Develop and maintain full-stack SaaS features on a cloud platform using C#, ASP.NET, and React. Collaborate with team leads on design, testing, CI/CD, and documentation. Apply DDD, microservices, and scalable patterns; mentor engineers and promote best practices. Support AI-assisted development workflows and work with international, remote teams.

Develop and maintain full-stack applications for Fixed Income trading and risk management, collaborating with traders and analysts for innovative solutions.

Cygnus Professionals Inc. is hiring .NET Developers and other IT professionals to provide solutions and onsite services to customers.

Cygnus is seeking .NET and Java Developers to contribute to its information technology and consulting projects, ensuring customer satisfaction and quality service.

Cygnus is looking for experienced .NET and Java developers to join their team in the USA. Candidates should be dedicated to customer success and possess a strong value system.

Cygnus is seeking .Net Fullstack Developers to aid in IT consulting and deliver excellence to customers, emphasizing commitment and ownership.

Cygnus Professionals Inc. is hiring experienced .NET and JAVA developers for their IT Solutions Division. Candidates will provide onsite services and work in various technologies mentioned.

Design, develop, test, deploy, and maintain scalable enterprise applications using C#, .NET, ASP.NET MVC, Web API, Angular, SQL Server, Azure, and API integrations. Build secure, high-performance backend services and responsive front-end applications. Participate in code reviews and follow development standards. Preferred experience includes banking or financial services, AutoSys, Oracle, Tomcat, JBoss, Java, MQ technologies, cloud migration, and application modernization.

Lead design, implement, and maintain a scalable SaaS insurance platform across front-end and back-end. Provide technical direction, mentor developers, enforce best practices, optimize performance, ensure security and compliance, and drive adoption of modern architectures and testing methodologies.

Develop and support .NET application systems through analysis, design, construction, testing, implementation, and operational support. Evaluate complex technical and business problems, recommend programming and security solutions, consult with users and technology teams, establish development standards, and advise junior analysts. The role requires independent judgment, risk awareness, deadline management, and strong collaboration across the software development lifecycle.

Develop and support enterprise .NET applications using C#, ASP.NET, .NET Core, Web API, Blazor WebAssembly, and Entity Framework. Build RESTful services, write unit tests, debug production issues, integrate Azure authentication solutions, and deliver secure, accessible AODA-compliant applications. Collaborate with developers, QA, architects, and business stakeholders throughout Agile delivery and release cycles.

Own the BusPlanner mobile application portfolio across Android and iOS using .NET MAUI and C#. Build supporting .NET REST APIs, integrate ruggedized tablets and peripherals, manage signing and store releases, maintain push notifications, and provide production support. The role also contributes to GPS, ridership, scanning, dispatch, and adjacent transportation platform features while working autonomously in a small team.

Lead design and delivery of cloud-native .NET APIs on Azure, drive architecture (Clean Architecture, CQRS, DDD), operate Kubernetes-deployed services, optimize SQL Server/EF Core performance, adopt AI development tools, mentor engineers, perform security-focused code reviews, and troubleshoot production issues.

Design, build, and maintain scalable full-stack web applications using Python, .NET and modern frontend frameworks. Develop REST APIs, integrate AI/ML or LLM capabilities, work with relational/NoSQL databases, deploy to cloud environments, optimize performance, and ensure security and quality through testing, code reviews, and collaboration with cross-functional teams.

Design, implement, and maintain backend services and web applications on a Microsoft stack; build front-end features with React; write well-tested, secure code; collaborate with product and design; participate in code reviews and improve CI/CD/DevSecOps pipelines.

Design, develop, test, maintain and re-architect web and mobile applications using .NET/C#. Build and maintain SQL Server databases and BI components, support production, ensure security, document architecture, lead technical decisions, and mentor team members.