Top .NET Developer Jobs in Toronto

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.

The Senior Software Engineer will develop automation tools for marketing campaigns, build applications on Google Cloud, and work in an agile team. Responsibilities include mentoring, creating APIs, and contributing to design decisions with a focus on best practices.

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

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, build, and optimize high-performance .NET Core backend microservices. Implement observability (tracing, logging, metrics), improve service-to-service communication and PostgreSQL performance, maintain CI/CD, support deployments (blue/green, canary), collaborate with DevOps/QA/frontend, and troubleshoot production issues in a large distributed system.

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.

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.

Design, implement, test, and deliver end-to-end backend features for enterprise security and identity SaaS products. Collaborate cross-functionally, improve architecture, ensure quality and security, and support distributed systems and data modeling.

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.

Own full-cycle sales for net-new Workday implementation deals globally: prospect, qualify, negotiate, and close high-value professional-services contracts while building C-level relationships and maintaining a high outbound activity pace.

Develop .NET applications and provide Unix/AIX and Windows server administration. Perform shell scripting, database work (SQL Server, Progress), reporting support, and liaise with business users. Provide customer support, adapt to change, and work cross-functionally.

Develop and maintain C#/.NET applications using WCF, AJAX, and SQL Server. Toronto-based permanent role, start ASAP. Work on backend and integration components within the .NET technology stack.

PERM .NET Developer role in Toronto to build and maintain C#/.NET applications and services using WCF, AJAX, and SQL Server. Start ASAP.

Design and develop scalable applications in a team-based Agile environment, collaborating with cross-functional teams and utilizing cloud platforms.

Design, build, and ship production-grade distributed features within cross-functional agile teams. Contribute to architecture, prototype solutions, write automated tests, debug and profile distributed systems, resolve defects, coordinate technical dependencies, perform code reviews, and share knowledge to improve product quality and team practices.

Design, implement, test, deploy, and maintain scalable, secure full-stack software. Lead technical design, CI/CD, containerized deployments, messaging systems, databases, code reviews, pair programming, and cross-team collaboration while mentoring and occasionally leading the team.

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

Lead design and implementation of high-scale backend systems powering real-time reservation availability. Drive product features and infrastructure upgrades, build and optimize microservices for multi-data-center scalability, enforce reliability through automated testing, collaborate via code reviews and pair programming, and adopt AI technologies responsibly.

As a Sr. Software Engineer, you'll design and develop features for a SaaS platform, collaborate with teams, tackle technical problems, and ensure high-quality solutions with an ownership mindset.

Design, build, test, and maintain enterprise C#/.NET applications within agile teams. Develop scalable REST APIs and data models, write automated unit tests, enforce SOLID/OOP practices, mentor engineers, participate in planning/code reviews, and communicate with clients to deliver high-quality solutions.