Top .NET Developer Jobs in Toronto

As a Site Reliability Engineer, you will enhance system reliability, drive incident responses, design tools for automation, and participate in on-call rotations.

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.

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.

Build and maintain the SaaS Manager platform to help IT and security teams discover, govern, and optimize SaaS and AI ecosystems. Deliver end-to-end features, write tests and documentation, participate in code reviews, collaborate with product and design, and proactively improve the codebase and processes.

Lead design, development and integration of enterprise-scale .NET applications for Global Derivatives. Develop technical roadmaps, implement microservices and APIs, run code reviews, mentor peers, and ensure solutions follow SOLID principles and unit testing standards to enhance client experience.

Design, build, and optimize high-performance .NET Core backend microservices in a large distributed system. Implement observability (traces, logs, metrics), optimize DB access (PostgreSQL), improve service-to-service communication, support CI/CD, participate in architecture reviews, and troubleshoot production issues to ensure scalability, availability, and maintainability.

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.

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

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.

Lead design, development, and integration of enterprise-scale backend systems. Architect technical solutions, build APIs and cloud/containerized services, lead full‑stack team, run code reviews, mentor developers, and drive multi-year technology roadmaps aligned with business goals.

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.

Design, develop, integrate, and maintain enterprise-scale backend applications for AML/transaction monitoring. Lead technical design, implement solutions using .NET/C#/SQL and Azure data tools, run code reviews, mentor developers, and produce roadmaps aligning technology with business goals.

Design, build, and optimize server-side logic and scalable RESTful APIs. Maintain databases, write unit/integration tests, refactor legacy .NET 4.8 code, implement data security, and collaborate with product, front-end, and QA teams to deliver reliable solutions.

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.

Lead net revenue management strategies to optimize pricing, promotions, assortment, and trade investment. Use financial analysis and advanced analytics to measure impact, collaborate with sales and cross-functional teams, and support integrated business planning to drive sustainable, profitable growth and achieve NRM targets.

Lead monthly NII/NIM analysis and stakeholder alignment across treasury, finance, and business segments. Build and maintain Excel driver-based NIM and balance sheet forecasting models, integrate models into QRM for stress testing, analyze results, and present findings. Advise on FTP, hedging, and margin drivers while documenting data flows and processes.

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.

Contract .NET Developer to design, develop, and maintain scalable backend services using C#, .NET Core, ASP.NET Core and MongoDB. Build REST APIs and microservices, collaborate with architects, QA, and DevOps, and deliver high-performance, cloud-enabled solutions following Agile/Scrum.

Design and build scalable .NET backend services and gRPC microservices; optimize data layers (SQL Server, MongoDB, Elasticsearch); implement cloud integrations on AWS and Azure; ship AI/ML features (LLMs, RAG, vector search, ranking, personalization) and operate MCP servers; contribute to CI/CD, observability, containerization, and production ML integrations impacting high-traffic consumer marketplaces.

Lead applications analysis and development efforts, design and enforce coding/testing standards, resolve complex business and system issues, ensure architecture compliance, define system enhancements, manage implementations and projects, coach mid-level developers, and drive risk/compliance awareness.

Build and maintain scalable, cloud-native APIs using .NET. Enhance core platform components, lead architecture and testing discussions, optimize telemetry and performance, collaborate cross-functionally, conduct code reviews, and mentor team members.