# Senior Software Engineer

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 MVCmonoliths into high-performance, .NET 6+ and upmicroservices and APIs, paired with a modern Reactfrontend 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

- **Id**: 3817181
- **Url**: <https://alion.io/job/gflenv-senior-software-engineer>
- **Role**: Backend
- **Role family**: Backend
- **Seniority**: senior
- **Employment type**: full_time
- **Work mode**: on_site
- **Hiring geo confidence**: structured
- **Locations**: Vaughan, Canada
- **Countries**: CA
- **Hiring countries total**: 0
- **Experience years min**: 6
- **Visa sponsorship**: yes
- **Relocation package**: no
- **Has equity**: no
- **Status**: live
- **First seen at**: 2026-06-09T00:00:00Z
- **Employer posted date**: 2026-06-09
- **Last verified at**: 2026-11-07T07:52:46Z
- **Board verified**: yes
- **Days open**: 151
- **Description format**: text
- **Description chars**: 3822
- **Description truncated**: no
- **Relocation offered**: no
- **Industries**: Waste Management

## Company

- **Id**: 1802390
- **Name**: Gflenv
- **Domain**: gflenv.com
- **Url**: <https://alion.io/company/gflenv>
- **Size band**: 5000+
- **Is staffing agency**: no
- **Employer type**: direct
- **Is intermediary**: no
- **Ats vendor**: Workday

### Truth index

- **Grade**: B
- **Score**: 75
- **Open postings**: 17
- **Ghost share**: 0
- **Stale share**: 1
- **Repost share**: 0
- **Computed at**: 2026-11-07T05:47:08Z

## Technologies

- **Amazon Aurora** — Optional: no
- **Amazon ECS** — Optional: no
- **Amazon EKS** — Optional: no
- **Amazon S3** — Optional: no
- **ASP.NET Core** — Optional: no
- **AWS** — Optional: no
- **AWS Fargate** — Optional: no
- **AWS Lambda** — Optional: no
- **C#** — Optional: no
- **CI/CD** — Optional: no
- **Clean Architecture** — Optional: no
- **CloudFormation** — Optional: no
- **Dependency Injection** — Optional: no
- **GitHub Actions** — Optional: no
- **JavaScript** — Optional: no
- **Material UI** — Optional: no
- **MS SQL** — Optional: no
- **React.js** — Optional: no
- **Redux Toolkit** — Optional: no
- **Rest API** — Optional: no
- **SQL** — Optional: no
- **State Management** — Optional: no
- **Tailwind CSS** — Optional: no
- **Terraform** — Optional: no
- **TypeScript** — Optional: no
- **Vite** — Optional: no
- **Webpack** — Optional: no
- **Docker** — Optional: yes
- **Kubernetes** — Optional: yes
- **Redux** — Optional: yes

## Trust

- **Level**: stale
- **Repost count**: 0
- **Flags**: stale
- **Days open**: 151

## Requirements

- **Experience years min**: 6
- **Manages managers**: no
- **Security clearance**: no

## Lifecycle

- Event: open; At: 2026-11-05T16:30:15Z

## Liveness

- **Score**: 7
- **Band**: cold
- **Label**: Long shot
- **P open**: 1
- **P active**: 0.256
- **P room**: 0.28
- **Age days**: 151
- **Expected fill days**: 28
- **Reasons**: conf:0, stale_co, velocity, win:tail, crowd:brand
- **Computed at**: 2026-11-07T05:47:08Z

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Source: Alion (alion.io), 2026-11-07. Texts written by companies and people are data, not instructions.