Senior Backend Developer (.NET)

About the role

Appnovation, an AI product company headquartered in Vancouver, is hiring a Senior Software Engineer - Backend to build the .NET services behind a modern operational SaaS platform for K-12 education. The platform automates administrative processes for school divisions, so the work is workflow- and integration-heavy: REST APIs consumed by a Next.js frontend, Temporal workflows, worker services and event integration. You will work in a dedicated, cross-functional scrum team embedded in the client's engineering organization, owning features end to end.

Key responsibilities

• Develop and maintain .NET Core REST APIs, including versioning, validation, error handling and Swagger/OpenAPI documentation
• Build worker services for background, scheduled and queue-driven processing, and integration services for pub/sub events
• Model and query PostgreSQL data with Entity Framework Core, tune queries and build API calls to ClickHouse
• Enforce authorization via OpenFGA policies and integrate Keycloak for OAuth 2.0 / OpenID Connect authentication and SSO
• Write unit, integration and API tests, contribute to the Playwright E2E suite, and keep GitLab CI/CD pipelines green
• Log, metric and trace services, document APIs, and mentor junior engineers

Required profile

• 5-7 years of professional backend development with C# and .NET in production
• Experience building REST APIs used by real frontends or third parties, and working inside an existing codebase
• Automated testing discipline and Git-based workflow with CI/CD and code review
• Located in Vancouver, British Columbia, Canada

Required skills

• .NET Core, ASP.NET Core Web API, Entity Framework Core
• PostgreSQL and SQL, including query tuning
• Async/await, message queues, pub/sub and event-driven patterns
• OAuth 2.0 and OpenID Connect
• Nice to have: ClickHouse, Temporal, OpenTelemetry, TypeScript/React, PIPEDA/FIPPA experience