At Flynn, it's not just a job, it's a career Flynn Group of Companies, North America’s leading building envelope contractor is looking to hire a Sr. Web Application Developer to work in our beautiful Mississauga location.    Relocation assistance provided for TOP qualified candidates. And expects individuals coming to office all 5 days   Our Tech Stack Our primary tech stack is .NET (C#) hosted in AWS and Microsoft Azure. We use MongoDB, MySQL, and SQL Server for our databases. Apps are built in ASP.NET and Angular for our web apps.   What we offer:  -Funded training and development program -Very well-equipped on-site gym w/ free access -Dental and supplemental medical plan -Matching RRSP contributions -Employee and Family Assistance Program -Subsidized onsite cafeteria with excellent food choices! -Free parking and EV Charging facility -Family Events and Flynn Fest -MSDN Subscription -Enterprise AI subscription (GitHub Copilot, Claude, or similar - your choice)      Responsibilities -Will be a core member of the team to design, architect, develop, code reviews and test our key applications   -Design new application features and integrations in collaboration with team members to deliver complex changes   -Design and implement scalable and resilient cloud solutions with security and disaster recovery in mind   -Help the team plan and execute technical deliverables -Ensure good code coverage and test coverage by writing and maintaining effective automated tests   -Be a champion of code quality in team by adhering to CLEAN architecture and SOLID principles   -Mentor other developers on the team in software development life cycle and best practices and elevate the skill of the team through technical mentorship   -Work with BA team and stakeholders to identify business needs and develop solutions that align with their objectives   -Off-hours support as required   -Participate in a rotating weekly on-call schedule    What we are Seeking   -10+ years of recent experience, with at least 5 years in a Sr. Web Developer or similar senior role   -Post-secondary education in Computer Science/IT or related field   -Experience in .NET / .NET Framework and C#   -Experience in entity framework   -Experience with TypeScript front-end frameworks: Angular, React, Vue   -Experience with commonly used relational database: MySQL, SQL Server, Postgres   -Experience with commonly used non-relational databases: MongoDB, DocumentDB, DynamoDB   -Docker and container-hosting: AWS ECS, Kubernetes   -General Amazon AWS knowledge (or equivalent): EC2, S3, CloudFront, Elastic Beanstalk, Dynamo DB   -Basic networking knowledge and troubleshooting   -Experience with any of the following tools and technologies: Atlassian Jira, GitHub, Azure DevOps, Aha!, New Relic, Sumo Logic -Familiarity with AI-powered development tools such as GitHub Copilot, Claude Code, or similar - we embrace AI-assisted development as part of our engineering culture    -We trust our engineers - if there's a tool, license, or resource that helps you work better, just ask. We'll make it happen  #LI-AD1 Flynn Group of Companies is the leading trade contractor in North America that works on virtually every aspect of a building’s outer layer, including Roofing, Glazing, Waterproofing, and Architectural Metals. The foundation of our award winning success is having the right people on our team. Disclosure: We use an AI-powered system to initially screen resumes.  However,  all applications/resumes are also reviewed by our team of Human Resources and Talent Acquisition Professionals to ensure a fair and thorough evaluation in determining a candidate’s potential fit for a role they applied to. This posting is for an existing vacancy within the organization.