Top .NET Developer Jobs in Toronto

Design, develop, modernize, and maintain enterprise applications and secure RESTful APIs using C#, .NET, ASP.NET Core, and SQL Server. Collaborate across the application stack with React, Angular, or similar frameworks; improve legacy systems, performance, reliability, and security. Participate in technical design, code reviews, automated testing, CI/CD, Docker deployments, troubleshooting, and Agile delivery. Contribute to AI-assisted engineering practices, documentation, mentoring, and continuous improvement.

Develops and delivers front-end and back-end components for N-tier web applications using .NET, ASP.NET, C#, SQL Server, and web APIs. Responsibilities include analyzing requirements, designing and coding solutions, integrating databases, collaborating with business and QA analysts, advising on technology implementations, and communicating project progress. Requires end-to-end full-stack development experience and a background in Surety Insurance.

Leads the architecture, development, deployment, and support of enterprise full-stack applications using .NET, Angular, AWS, microservices, and AI-assisted development tools. Provides technical leadership, mentoring, and engineering standards while driving cloud modernization, CI/CD, DevOps, security, observability, performance, and production support. Collaborates with stakeholders and technology teams on solution design, technical roadmaps, Agile delivery, and enterprise-scale initiatives.

Develop and optimize high-performance .NET Core and C# backend microservices within a distributed system of more than 100 services. Responsibilities include PostgreSQL optimization, service communication, observability, resilience, CI/CD, deployment strategies, performance profiling, troubleshooting, and architecture reviews. Collaborate with DevOps, QA, and frontend teams to maintain scalable, reliable services using Kubernetes, Docker, and messaging technologies.

Lead the architecture and evolution of a large .NET Core microservices platform. Define service boundaries, communication, data, observability, deployment, resilience, and coding standards. Make architecture decisions, guide performance optimization, lead incident resolution, establish CI/CD and testing practices, and mentor engineering teams. The role requires hands-on development, production troubleshooting, cloud and Kubernetes expertise, and extensive experience designing distributed systems at scale.

Develop and maintain full-stack software solutions using .NET and related web technologies. Responsibilities include feature development, unit testing, code reviews, incident support, troubleshooting, system documentation, application integration, quality assurance, and collaboration with technology and business stakeholders. The role also supports continuous improvement, automation, risk management, and mentoring while ensuring solutions meet architectural, performance, security, and regulatory standards.

Leads Aviva Canada's $165M+ high-net-worth insurance portfolio, overseeing strategy, profitable growth, underwriting performance, risk selection, pricing execution, customer propositions, broker partnerships, and operational excellence. The role manages transformation, cross-functional collaboration, regulatory and financial outcomes, and a high-performing underwriting team while balancing growth, profitability, client experience, and portfolio risk.

Develop and own front-end and full-stack web applications for Citi’s trade processing platform. Build React and HTML5 interfaces, modernize legacy UI components, integrate .NET/C# services, and ensure automated testing, security, compliance, and design quality. Responsibilities include requirements analysis, implementation, technical recommendations, production support, stakeholder consultation, risk assessment, process standards, and mentoring junior team members. The role supports capital markets applications and requires independent judgment and collaboration across technology and business teams.

Leads Greenfield Global’s enterprise Net Zero and carbon management strategy across North America. Responsibilities include developing carbon reduction roadmaps, tracking emissions and sustainability goals, guiding regulatory and carbon market compliance, conducting carbon and lifecycle impact assessments, forecasting and reporting performance, and partnering with manufacturing, operations, supply chain, finance, procurement, and commercial teams to identify decarbonization opportunities.

Designs and maintains large-scale distributed systems on Azure using C# and .NET. Owns backend services, APIs, data access, cloud infrastructure, CI/CD, and operational support. Drives architecture and technical strategy, resolves systemic production issues, collaborates with business stakeholders, and mentors engineers. The role requires extensive experience with Azure, production backend systems, complex codebases, distributed systems, and regulated or domain-heavy industries, with preferred healthcare and life sciences expertise.

Responsible for leading programming efforts, mentoring teammates, and developing robust, cloud-based applications using modern technologies and methodologies.

Develop and maintain warehouse management software using C#, ASP.NET, .NET Core, Web APIs, and SQL Server. Modernize legacy applications, build backend services, support mobile and Windows applications, and contribute to architecture, performance, CI/CD, code quality, and security improvements. Collaborate with product, operations, and engineering teams, troubleshoot complex issues, conduct code reviews, and support Agile development and process improvement initiatives.

Leads a cross-functional engineering team developing secure, optimized software solutions. Responsibilities include architecture and design, coding, code reviews, client and team communication, process improvement, deployment and configuration in cloud environments, and managing team members’ professional development. The role requires expertise in C#, monolithic and microservice architectures, event-driven systems, communication protocols, SQL and NoSQL databases, container orchestration, and software quality practices.

Design, develop, test, maintain, and document secure .NET web and database applications. Build responsive front-end experiences, integrate APIs and data feeds, support Azure and AWS cloud applications, and apply OWASP-aligned security practices. Translate stakeholder requirements into technical solutions, participate in Agile development, code reviews, vulnerability remediation, troubleshooting, testing, and documentation. Collaborate with technical, security, database, cloud, and business teams while supporting GIS integrations and continuous improvement.

Build and maintain scalable, cloud-native APIs and high-value core system components using .NET and related technologies. Lead software architecture and testing discussions, enhance core offerings, collaborate cross-functionally, and ensure quality through code reviews, unit testing, functional testing, telemetry, and performance tuning. Mentor teammates and contribute to continuous technical and process improvement.

Leads the design, development, maintenance, and technical direction of a scalable insurance SaaS platform. Works across .NET back-end and Vue/React front-end technologies, optimizes performance, enforces coding and security standards, leads code reviews, resolves bugs, and mentors developers. Collaborates with product, design, and engineering teams on architecture, requirements, testing, cloud infrastructure, microservices, and continuous platform improvement.

Designs and leads enterprise application architecture across .NET, React, and Azure. Responsibilities include defining technical strategies and roadmaps, guiding engineering teams, designing cloud-native systems and APIs, supporting production applications, and improving reliability, observability, performance, security, and scalability. The role also involves stakeholder engagement, technical leadership, mentoring, consulting, distributed-team collaboration, and adoption of AI-assisted development tools such as GitHub Copilot and Claude.

Lead development of secure, scalable digital banking software across front-end and backend systems. Design Angular or React applications, build APIs, optimize SQL performance, integrate third-party platforms, improve code quality, implement testing strategies, and mentor engineers. Collaborate with cross-functional teams in an Agile environment while supporting cloud-native practices, regulatory compliance, and continuous product improvement.

Leads architecture, development, modernization, and lifecycle management for cross-platform mobile applications using .NET MAUI, Xamarin, C#, and XAML. Owns migration from Xamarin.Forms, platform-specific performance, API and SDK integrations, secure storage, offline synchronization, CI/CD, app deployment, coding standards, and architecture reviews. Mentors engineers and collaborates with product, UX/UI, backend, QA, and other stakeholders to deliver reliable Android and iOS applications.

Design, build, and own integrations between a fintech platform and ERP or accounting systems. Develop REST and SOAP services, synchronization and reconciliation workflows, data mappings, validation, retries, audit trails, and observability. Improve reliability and performance, troubleshoot production failures, and collaborate with onboarding, support, engineering, and non-technical stakeholders. The role requires strong C#, .NET, SQL Server, messaging, and financial-system integration experience, with opportunities to use Azure and AI-assisted development tools.

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.

Leads end-to-end modernization from a monolith to microservices, including legacy analysis, architecture, estimation, data migration, deployment, and production support. Guides .NET services, databases, messaging, containerization, and frontend integrations. Acts as the technical escalation point for complex issues while improving Jira tracking, estimation accuracy, QA collaboration, release predictability, and engineering processes. Manages and develops the team through one-on-ones, performance reviews, feedback, and career-focused objectives.

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.

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.