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.

Leads monthly Net Interest Income and Net Interest Margin analysis, explaining performance drivers and coordinating reporting across Treasury, Finance, and business segments. Develops balance sheet and revenue forecasting models in QRM for enterprise and macroeconomic stress testing. Validates banking product, funds transfer pricing, liquidity, hedging, and prepayment assumptions; analyzes results; and presents findings to management and stress-testing forums.

Develop, enhance, troubleshoot, and maintain secure enterprise web and desktop applications using Microsoft .NET and Azure technologies. Translate business requirements into scalable solutions, participate across the full software development lifecycle, implement CI/CD and DevOps practices, integrate enterprise systems, manage Azure and SQL Server environments, and collaborate with stakeholders. The role also includes code reviews, testing, documentation, knowledge transfer, and onsite support in Toronto.

Lead high-net-worth life and critical illness underwriting for large cases ($5M–$10M), mentor senior underwriters, perform complex medical/financial/lifestyle risk assessments, exercise signing authority, negotiate reinsurance, and present underwriting rationale to advisors and firms.

Designs, develops, and maintains enterprise applications using C# and .NET. Builds Azure cloud-native solutions, workflow automation systems, high-volume processing engines, and SQL Server/Azure SQL databases. Participates in code reviews, CI/CD development, application modernization, and cloud transformation initiatives while collaborating with stakeholders, architects, and development teams.

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.

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.