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Added 4 months ago
S
Technical Support Engineer
Sentry
Remote, Canada
- $100,000 to $125,000 CAD / year
- Full-time
- Remote
…Technical Lead for our Agentic Ops. You ensure that when a developer asks a complex question, our systems have the right context and a seamless "Human-in-the-Loop" path to you when deep,…
Added 4 months ago
DC
Survey CAD Technician (Intermediate/Senior)
Dillon Consulting Limited
Saint John, New Brunswick · Halifax, Nova Scotia
- Full-time
Working knowledge of the following programs and programming languages is an asset: Pix4D, Power BI, CityEngine, Python, ArcPy, JavaScript, and Arcade.
Added 4 months ago
IL
Advanced Quality Engineer
Invesco Ltd.
Charlottetown, Prince Edward Island
- Full-time
Demonstrated experience with test automation frameworks and scripting languages (Python, JavaScript, Java, etc.).
Added 2 months ago
Q
Validation Engineer, Senior
Qualcomm
Toronto, ON
- Full-time
Experience in Mango Database, HTML, JavaScript for data post processing and analysis is a plus
Added 2 months ago
GM
Senior Software Developer - Test Automation
General Motors
Remote, Canada
- Full-time
- Remote
Strong programming skills in Python, other languages such as Java, C#, or JavaScript are a bonus.
Added 4 months ago
AG
Quality Assurance Contract
Amynta Group
Toronto, Ontario · Vaughan, Ontario
- Full-time
Experience with scripting languages (e.g., Python, JavaScript, C) for automated testing.
Added 2 months ago
Software Developer - Data Products and Services
Squarepoint Capital
Montreal, QC
Added 1 month ago
A
Principal Software Developer
Autodesk
Toronto, ON · Montreal, QC · Quebec, QC · ON · AMER - Canada - Ontario - Offsite/Home
- Full-time
Maîtrise de niveau expert de JavaScript/TypeScript et des technologies web modernes
Added 1 month ago
Associate Platform Engineer
Scotiabank
Toronto, ON
Frontend development background in building web applications using technologies like ReactJS, NodeJS, NextJS and modern JavaScript toolsets (SonarQube, CheckMarx, Web Inspect) and…
Added 4 months ago
GE
Senior Software Engineer
GFL Environmental Inc.
Vaughan, Ontario
- Full-time
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. You will be responsible for…
Added 4 months ago
M
Senior Software Developer (.NET/SQL Server)
Monark
Surrey, British Columbia · White Rock, British Columbia
- Full-time
We’re looking for a Senior Software Developer to build and support enterprise applications across a mix
Added 4 months ago
PM
Software Development Engineer | Frontend
Picton Mahoney Asset Management
Toronto, ON
- Full-time
Added 4 months ago
J
Senior ServiceNow Consultant
Jolera
Remote, Canada
- Full-time
- Remote
Expert-level proficiency in ServiceNow development: JavaScript, Business Rules, Client Scripts, Script Includes, Flow Designer, and REST/SOAP APIs
Added 4 months ago
AT
Principal Software Developer
Aspen Technology
Montreal, Quebec
- Full-time
AspenTech is looking for a talented and experienced Developer with Quality background to join our Enterprise Operations Platform (EOP) organization. In this role, you will be responsible…
Added 4 months ago
R
Senior Software Engineer
Relay
Remote, Canada
- Full-time
- Remote
Have experience with JavaScript - we primarily use TypeScript, React, and Node.js
Added 4 months ago
T
Senior Software Engineer, Site Reliability Engineering
Thumbtack
Remote, Canada
- Full-time
- Remote
…work with engineering teams ranging from product development, developer experience, and backend infrastructure to collaboratively build Thumbtack’s ecosystem of platform services that have…
Added 4 months ago
H
AI Solutions Architect
HireHawk
Remote, Canada
- Full-time
- Remote
Added 1 month ago
Martech Solutions Architect - AEP
VML
Toronto, ON
Extensive knowledge of technologies such as SQL, XML, JSON, JavaScript, HTML,
Added 1 month ago
Martech Solutions Architect - AEP
MAP
Toronto, ON
Added 4 months ago
Software Developer, Backend – Antec Controls
Price Industries Limited
Winnipeg, Manitoba
The Systems Developer role offers the opportunity to design and deliver impactful, customer-facing web applications while continuously improving performance and scalability. If you are…
Added 4 months ago
Sales Product Specialist - AI Solutions
Ombud
Quinte West, Ontario
Scripting or light development skills (Python, JavaScript, SQL) to build custom POC integrations without engineering support.
Added 4 months ago
C
Java Full-stack Developer
Capgemini
Mississauga, Ontario
- Full-time
The candidate must have Java front end development experience on ReactJS, NodeJs, Javascript and Angular
Added 4 months ago
MT
Application Architect
McCarthy Tétrault LLP
Vancouver, British Columbia
- Full-time
…proficient in one or more programming languages such as C#/.NET, JavaScript/TypeScript , Python or Java. Experience with modern development frameworks and tools (e.g., .NET Core, ASP.NET,…
Added 4 months ago
MT
Application Architect
McCarthy Tétrault LLP
Toronto, Ontario
- Full-time
…proficient in one or more programming languages such as C#/.NET, JavaScript/TypeScript , Python or Java. Experience with modern development frameworks and tools (e.g., .NET Core, ASP.NET,…
Added 4 months ago
MT
Application Architect
McCarthy Tétrault LLP
Calgary, Alberta
- Full-time
…proficient in one or more programming languages such as C#/.NET, JavaScript/TypeScript , Python or Java. Experience with modern development frameworks and tools (e.g., .NET Core, ASP.NET,…

GFL Environmental Inc.

Senior Software Engineer

Vaughan, ON, Canada

Full-time

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Job details

Job type: Full-time
Posting language: English
Posted: Jun 9, 2026

Original job description

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. You will be responsible for the end-to-end modernization of legacy .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.

This is not a "maintenance" role; it is a "re-engineering" role. You will bridge the gap between reliable legacy logic and the future-proof scalability of modern cloud architecture.

Key Responsibilities

Legacy Deconstruction: Analyze existing .NET 4.8 MVC applications to identify business logic, dependencies, and integration points for migration.
Architecture Migration: Lead the transition from monolithic architectures to modern design patterns (Microservices, Hexagonal, or Clean Architecture).
Backend Modernization: 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 modern state management (Redux Toolkit, TanStack Query).
Cloud Orchestration: Design and deploy the modernized stack on AWS, leveraging services like Lambda, ECS (Fargate), S3, and RDS.
API Design: 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

Backend Expertise

Legacy: Deep understanding of .NET Framework 4.8, ASP.NET MVC, and Web API.
Modern: Expert-level proficiency in .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 modern 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.
Infrastructure: Familiarity with Infrastructure as Code (CloudFormation, CDK, or Terraform).
Deployment: Building CI/CD pipelines (GitHub Actions).

Preferred Qualifications

Experience using the AWS Porting Assistant for .NET or AWS Transform.
Familiarity with containerization (Docker) and orchestration.
Knowledge of Authentication/Authorization standards (OAuth2, OpenID Connect, AWS Cognito).
Proven track record of successfully migrating at least one large-scale enterprise application.

We thank you for your interest. Only those selected for an interview will be contacted.

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. If you are interested in applying for employment and need special assistance or an accommodation to apply for a posted position, please contact myworkdayrecruitment@gflenv.com

Please note that GFL does not provide visa sponsorship for this position. Valid work authorization in the country where the job is located is required. Successful candidates will be required to provide valid documentation confirming their eligibility to work in the country where the job is located prior to their start date.

This hiring process may utilize machine-based systems to assist in screening and assessing applicants. Final selection decisions are made by our recruitment team.

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More about this job

Responsibilities

Lead the digital transformation of legacy .NET Framework 4.8 MVC monoliths into modern .NET 6+ microservices and APIs. Develop a decoupled React SPA frontend and orchestrate the entire stack on AWS infrastructure.

Requirements

Requires 6+ years of experience with expert-level proficiency in C#, .NET Core, and modern React patterns. Must have hands-on experience with AWS services and the ability to migrate enterprise-scale legacy applications.

Skills

C#
.NET 6/8
React
TypeScript
AWS
Microservices
SQL Server
RESTful APIs
CI/CD
ASP.NET MVC
Redux Toolkit
TanStack Query

Visa sponsorship

Not detected in the job text

Keywords

.NET Framework 4.8
.NET 6
.NET 8
ASP.NET Core
C#
React
TypeScript
AWS Lambda
Amazon ECS
Amazon EKS
S3
RDS
Aurora
SQL Server
T-SQL
Microservices
Hexagonal Architecture
Clean Architecture
REST API
GitHub Actions
Docker
OAuth2
OpenID Connect
AWS Cognito
Vite
Webpack
Tailwind
Material UI
Redux Toolkit
TanStack Query

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