Full Stack Developer

Avant Imaging & Information Management, Inc.; Toronto; On-site; CAD 110,000 - 150,000; Full time

Job summary

Avant Imaging & Information Management, Inc. is seeking a Full Stack Developer – .NET to join our team in Toronto. You will design, develop, test, deploy, and maintain scalable web applications using C#, .NET Core, and modern front-end frameworks.

The role involves building RESTful APIs, integrating with enterprise systems, and ensuring security with OAuth 2.0 and JWT. You will collaborate with product managers, QA, DevOps, and other developers in an Agile environment.

Qualifications

• Strong hands-on experience with the .NET ecosystem and modern frontend development.
• Experience delivering production-grade web applications and APIs.
• Knowledge of RESTful services, SQL Server, and ORM patterns.
• Familiarity with cloud platforms, especially Azure, and DevOps practices.
• Testing: unit, integration, and automated CI.
• Excellent communication and collaboration skills.

Responsibilities

• Design, develop, and maintain full-stack web applications using C#, .NET/.NET Core, ASP.NET Core, and Web API.
• Build responsive front-ends with React, Angular, Blazor, or similar.
• Develop scalable RESTful APIs and integrate with third-party services.
• Design and optimize SQL Server databases and write complex queries.
• Implement secure auth using OAuth2/OpenID/JWT and Identity.
• Write clean, well-tested code following standards and patterns.
• Participate in architecture discussions and modernization efforts.
• Develop unit, integration, and automated tests; troubleshoot issues.

Skills

C#

ASP.NET Core

REST APIs

JavaScript/TypeScript

Entity Framework Core

DI and middleware

SOLID principles

Unit testing

Responsive front-end

Education

Bachelor's degree in CS/SE/IT

Tools

Azure

Docker

Kubernetes

GitHub Actions

CI/CD pipelines

Job description

Role Purpose

Reporting to the VP, Solutions & Delivery, we are looking for a talented and motivated Full Stack Developer – .NET to join our development team. The ideal candidate will have strong experience building scalable, secure, and high-performance web applications using the Microsoft .NET ecosystem, along with modern front-end technologies. You will be responsible for designing, developing, testing, deploying, and maintaining end-to-end applications while working closely with product managers, business analysts, QA engineers, DevOps teams, and other developers.

Core Responsibilities

• Design, develop, and maintain full-stack web applications using C#, .NET / .NET Core, ASP.NET Core, and Web API.
• Build responsive and user-friendly front-end applications using React, Angular, Blazor, or similar modern JavaScript/C# frameworks.
• Develop scalable RESTful APIs and integrate third-party services and enterprise systems.
• Design and optimize relational databases using SQL Server, including tables, stored procedures, views, functions, and queries.
• Implement secure authentication and authorization using technologies such as OAuth 2.0, OpenID Connect, JWT, and ASP.NET Core Identity.
• Process and transform large fixed-width and delimited (CSV/flat) input files as part of data integration and batch workflows.
• Generate large, well-structured XML output and associated XSD schemas for downstream systems and partners.
• Integrate with document/PDF generation platforms such as Quadient, Exstream, or SmartCOMM to support customer communications.
• Write clean, maintainable, reusable, and well-tested code following established coding standards and design patterns.
• Participate in architecture and technical design discussions and contribute to application modernization initiatives.
• Develop unit, integration, and automated tests to ensure application quality and reliability.
• Troubleshoot and resolve application defects, performance issues, and production incidents.
• Work with DevOps teams to support CI/CD pipelines, automated deployments, monitoring, and cloud infrastructure.
• Collaborate with cross-functional teams to understand requirements and translate them into technical solutions.
• Conduct code reviews and provide constructive feedback to team members.
• Create and maintain technical documentation, API documentation, and development standards.
• Stay current with emerging technologies and recommend improvements to development practices and application architecture.

Required Qualifications

Backend

• Strong proficiency in C#
• Hands-on experience with .NET / .NET Core
• Strong experience with ASP.NET Core
• Experience developing RESTful Web APIs
• Knowledge of Entity Framework Core
• Understanding of dependency injection, middleware, configuration, logging, and application lifecycle
• Good understanding of object-oriented programming and SOLID principles
• Experience with common design patterns and clean architecture principles
• Experience processing large fixed-width and delimited input files
• Experience generating large XML files and XSD schemas
• Experience integrating with PDF generation software such as Quadient, Exstream, SmartCOMM, or similar

Frontend

• Strong experience with JavaScript / TypeScript
• Hands-on experience with at least one modern framework: React, Angular, Vue.js, or Blazor (C#-based)
• Strong knowledge of HTML5, CSS3, and responsive web design
• Experience consuming REST APIs and handling client-side state
• Familiarity with frontend build tools and package managers such as npm

Database

• Strong experience with Microsoft SQL Server
• Proficiency in writing complex SQL queries
• Experience with stored procedures, functions, views, indexes, and query optimization
• Understanding of database design, normalization, transactions, and performance tuning
• Experience with Entity Framework Core or another ORM

Cloud & DevOps

• Experience with Microsoft Azure or another major cloud platform
• Familiarity with Azure services such as Azure App Service, Azure Functions, Azure SQL, Azure Storage, Azure Key Vault, and Azure Service Bus
• Experience with CI/CD pipelines
• Familiarity with Git-based source control and branching strategies
• Experience with Docker and containerization is a plus
• Understanding of application monitoring, logging, and observability

Testing & Quality

• Experience with unit testing using frameworks such as xUnit, NUnit, or MSTest
• Understanding of integration and API testing
• Familiarity with mocking frameworks such as Moq
• Experience with automated testing and continuous integration
• Strong understanding of secure coding and application performance practices

Preferred Skills

• Experience with microservices architecture
• Knowledge of Azure DevOps or GitHub Actions
• Experience with Docker and Kubernetes
• Knowledge of messaging technologies such as Azure Service Bus, RabbitMQ, or Kafka
• Experience with Redis or other caching technologies
• Knowledge of GraphQL is a plus
• Familiarity with Elasticsearch or similar search technologies
• Experience with Agile/Scrum development methodologies
• Understanding of Domain-Driven Design (DDD)
• Experience with application performance monitoring tools
• Knowledge of AI/ML integrations or consuming LLM APIs is a plus

Qualifications

• Bachelor's degree in Computer Science, Software Engineering, Information Technology, or a related field, or equivalent practical experience.
• 3–7+ years of professional software development experience, depending on level.
• Strong hands-on experience with the .NET ecosystem and modern frontend development.
• Demonstrated experience delivering production-grade web applications.
• Strong analytical, problem-solving, and debugging skills.
• Excellent communication and collaboration skills.

What We're Looking For

• A strong problem solver with excellent attention to detail.
• Comfortable working across both frontend and backend technologies.
• Able to take ownership of features from requirements through deployment.
• Passionate about writing clean, maintainable, and scalable code.
Comfortable working in a collaborative Agile environment.Able to communicate technical concepts effectively to both technical and non-technical stakeholders.

Typical Technology Stack

• Backend: C#, .NET 8/9+, ASP.NET Core, Web API, Entity Framework Core
• Frontend: React / Angular / Blazor, TypeScript, JavaScript, HTML5, CSS3
• Database: Microsoft SQL Server
• Cloud: Microsoft Azure
• DevOps: Azure DevOps / GitHub Actions, CI/CD, Docker
• Testing: xUnit / NUnit, Moq, Postman
• Version Control: Git / GitHub / Azure Repos
• Architecture: REST APIs, Microservices, Clean Architecture, SOLID, Design Patterns
• Data & Documents: Fixed-width & delimited file processing, XML/XSD generation, PDF/document composition (Quadient, Exstream, SmartCOMM)