Senior Web Application Developer

At Flynn, it's not just a job, it's a career  North America’s leading building envelope contractor is looking to hire a Sr. Web Application Developer to work in our Mississauga location. Relocation assistance is available for the top qualified candidates and expects mandatory attendance at the office five days per week.

What we are offering

Funded training and development program

On‑site gym with 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 (Git Hub Copilot, Claude, or similar)

Responsibilities

Will be a core member of the team to design, architect, develop, review code, 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 test coverage by writing and maintaining automated tests.

Champions code quality in the team by adhering to CLEAN architecture and SOLID principles.

Mentor other developers on the software development life cycle and best practices, elevating the team’s skill set.

Work with business analysis team and stakeholders to identify business needs and develop solutions that align with their objectives.

Provide 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 Type Script front‑end frameworks:
Angular, React, Vue.

Experience with relational databases:
MySQL, SQL Server, Postgres.

Experience with non‑relational databases:
Mongo

DB, Document

DB, Dynamo

DB.

Docker and container‑hosting: AWS ECS, Kubernetes.

General Amazon AWS knowledge (EC2, S3, Cloud Front, Elastic Beanstalk, Dynamo

DB).

Basic networking knowledge and troubleshooting.

Experience with tools and technologies:
Atlassian Jira, Git Hub, Azure Dev Ops, Aha!, New Relic, Sumo Logic.

Familiarity with AI‑powered development tools such as Git Hub Copilot, Claude Code, or similar. We embrace AI‑assisted development as part of our engineering culture. If there is a tool, license, or resource that improves your productivity, let us know and we’ll provide it.

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