Senior Software Developer Job Hamilton area,Ontario Canada,Software Development

Join ABC Fitness and become part of a culture that’s as ambitious as it is authentic. Let’s transform the future of fitness—together!

Our Values
Best Life

We believe great work begins with great people. That’s why our culture is built on respect, trust, and belonging. We create an inclusive environment where every team member can bring their authentic self to work—because diverse perspectives drive innovation and meaningful impact.

Growth Mindset

We are doers, thinkers, and dreamers. At ABC Fitness, your growth is our investment. Through continuous learning, mentorship, and professional development opportunities, we empower you to reach new heights—personally and professionally.

One Team

From day one, you’ll be part of a team that collaborates, celebrates, and cares. We move fast, support one another, and have fun along the way. Because when you thrive, we all thrive.

INTRODUCTION

On the lookout for a Senior Backend Developer to join the Trainer experience development team with Trainerize powered by ABC Fitness Solutions (). This is an exciting opportunity to join a fast-growing technology company making waves in the fitness industry. This is a Canada-based individual contributor role. You will spend your time building, shipping, and improving real product backend and APIs alongside web, mobile, product, and design partners.

RESPONSIBILITIES:

Design, develop, test and document software for existing and new products
Develop, maintain, and optimize backend services, with a focus on ASP.NET web applications
Design and develop backend of our product, including Dotnet based RESTful API, SQL Server database
Design, build, version, and optimize RESTful APIs with a focus on clear contracts, performance, security, and backwards compatibility
Integrate with and consume third-party APIs reliably (auth, rate limits, retries, error handling)
Use an agentic coding IDE (Cursor or similar) as part of your daily workflow to ship faster, while reviewing and verifying agent-generated code rather than accepting it blindly
Collaborate with frontend web and mobile developers to design and deliver cohesive, high-quality features
Collaborate with a team to design, develop and ship new features
Work with Dev Ops to patch and release the product
Work with designers and developers to provide feedback on design
Review code and handle merge requests from other developers
Identify and correct bottlenecks and fix bugs
Help maintain code quality, organization, and automatization
Work closely with the team to provide estimation and progress for the project
Lead and coach Junior/Intermediate developers
Actively identify and improve software development best practices and processes that make sense for the Development team
Participate in a shared team responsibility to monitor and respond to critical issues, including system instabilities or feature regressions, ensuring rapid resolution and maintaining service reliability

QUALIFICATIONS:

Bachelor's Degree in Computer Science or a related field
Typically, 5+ years of .NET experience and/or other object-oriented programming languages
Experience with Microsoft Visual Studio
Familiar with C#, WebAPIs, MVC, ASP.NET
Strong RESTful API experience: designing, building, versioning, and optimizing APIs for performance and reliability
Habitual use of an agentic coding IDE (Cursor or similar) with sound judgment for reviewing and verifying AI-generated code
In-depth understanding of JavaScript programming and familiar with ES6
Work effectively in a cloud-based environment; experience with AWS is a strong plus
Familiar with object-oriented design patterns
Familiar with RESTful APIs
Experience with MS SQL Server and T-SQL language
Understanding of SQL best practices and methodologies and experience investigating and solving SQL performance issues
Proficient understanding of code versioning tools such as Git and the associated best practices
Familiarity with Agile methodologies and experience with leading a scrum team

AND IT'S GREAT TO HAVE

Experience with the No

SQL database will be a plus
Experience integrating high-traffic or third-party APIs
Exposure to multi-tenant SaaS products
General familiarity with a modern Type Script /…