Role Overview We are seeking a highly skilled Senior Full-Stack Developer with 6+ years of experience to lead the digital transformation of our core enterprise applications. NET Framework 4.8 MVC monoliths into high-performance, .NET 6+ and up microservices and APIs, paired with a modern React frontend and hosted on AWS. NET 4.8 MVC applications to identify business logic, dependencies, and integration points for migration.

Rewrite and refactor legacy C# code to .NET 6/8+, implementing cross-platform compatibility and improved performance.

Frontend Revolution: Replace Razor/Server-side rendering with a decoupled, state-of-the-art React SPA (Single Page Application) using TypeScript and contemporary state management (Redux Toolkit, TanStack Query). Design and deploy the modernized stack on AWS, leveraging services like Lambda, ECS (Fargate), S3, and RDS. Build robust, secure RESTful APIs that serve as the bridge between the new React frontend and the modernized backend.

CI/CD Implementation: Establish automated pipelines for building, testing, and deploying both the .NET and React components.

Technical

Requirements NET Framework 4.8, ASP.NET MVC, and Web API. NET 6/7/8 and ASP.NET Core.

Language: Advanced C# skills (Generics, LINQ, Async/Await, Dependency Injection).

Database: Experience with SQL Server (T-SQL) and migrating to AWS-managed databases (RDS/Aurora).

Frontend Expertise React: Strong experience with Functional Components, Hooks, and up-to-date React patterns.

Languages: JavaScript (ES6+) and TypeScript (Required).

Tools: Experience with Vite or Webpack, and CSS frameworks (Tailwind, Material UI). Cloud & DevOps (AWS) Compute: Hands-on experience with AWS Lambda (Serverless) or Amazon ECS/EKS.

Deployment: Building CI/CD pipelines (GitHub Actions).

Experience using the AWS Porting Assistant for .NET or AWS Transform.



Knowledge of Authentication/Authorization standards (OAuth2, OpenID Connect, AWS Cognito). GFL is committed to equal opportunity for all, without regard to race, religion, color, national origin, citizenship, sex, sexual orientation, gender identity, age, veteran status, disability, genetic information, or any other protected characteristic.

Current GFL Employees If you are an existing GFL employee and would like to search and apply to current job openings, please visit the internal GFL Jobs Hub. At the heart of GFL lies our greatest asset—our people. At GFL, growth isn’t just for our business—it’s for our people.

We consider our employees’ personal goals, helping them create the career, and life, that they desire—whether it’s advancing in their job, learning recent skills, forming lasting relationships, or mentoring others, while having time to pursue other life ambitions. With safety and sustainability at the core of what we do, we all come together to form “Team Green”—united by our shared purpose to provide environmental solutions that enable our customers and the communities we serve to be Green For Life. Regardless of the work we’re doing today, we’ve got our sights set on the big picture—not just tomorrow, but for life.

GFL empowers those looking for growth in their career and lives, whether that's on our Field Operations teams or Professional Services teams.

Field

Operations – Our Field positions offer candidates across North America the potential for limitless growth and skill expansion as the front line of our organization, making them central to our company's vision of creating cleaner and more sustainable communities.

Professional

Services – Our Corporate positions located in key North American offices grow candidates to form strong client relations, manage key programs and accounts, and ensure our Field teams are operating at maximum efficiency. #

📌 Entry Level -Software Developer - Web Development (Vaughan)
🏢 GFL Environmental
📍 Vaughan