Lead Backend Software Engineer

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! On the lookout for a Lead Backend Developer to join Trainerize powered by ABC Fitness Solutions ( ABC Fitness Solutions builds comprehensive, scalable technology and software designed to manage and grow fitness businesses of all sizes. We need a Lead Backend Developer to design APIs and data layers, improve performance and reliability, and grow the backend practice - including code review, standards, and mentoring.

You will lead through technical direction, influence, code quality, mentoring, and cross-functional partnership — not through people management.

You'll spend your days on the high-volume APIs that power fitness experiences for millions, in an environment where AI agents are part of how you think, build, and review. Every feature you ship and every standard you set helps prove that AI-native engineering isn't a side project here - it's how we build.

Design, develop, test, and document software for existing and new products

NET backend services (ASP.NET Core, REST APIs) and related data access

Own and evolve the backend architecture for our products, including RESTful APIs and Microsoft SQL Server (schema, queries, performance)

Partner with frontend (web and mobile), product, and design to define APIs and deliver cohesive, high-quality features

Work with DevOps on builds, releases, patching, and operational readiness

Review code, handle merge requests, and help keep code quality, structure, and automation (testing, CI/CD) at a high bar

Identify bottlenecks, debug production issues, and improve reliability and performance

Provide technical estimates and communicate progress and risks clearly

Bachelor's Degree in Computer Science or a related field

NET experience and/or other object-oriented programming languages

Experience with Microsoft Visual Studio

Familiar with C#, WebAPIs, MVC, ASP.NET

Deep RESTful API experience: owning API design, versioning, security, performance, and cross-team contracts at scale

Habitual use of an agentic coding IDE (Cursor or similar) and a track record of setting review standards for AI-generated code across a team

In-depth understanding of JavaScript programming and familiar with ES6

experience with AWS is a strong plus

Experience with MS SQL Server and T-SQL language

Understanding of SQL best practices and methodologies and experience investigating and solving SQL performance issues

Familiarity with Agile methodologies and experience with leading a scrum team

General familiarity with a modern TypeScript / cloud-native SaaS stack is a plus, but not required

120,000.00 -- $128,000.00 CAD- annually. In addition to base compensation, eligible employees may be offered other forms of compensation, such as bonuses, commissions, equity, or other incentive programs, where applicable. Compensation and benefits may vary by location and are subject to applicable legal, business, and market requirements.

Time Off – with our open PTO policy, we offer flexibility in how and when you take PTO!

Parental & Pawternity Leave – we offer leave for when your family grows by two feet or four paws!

Medical/Dental/Vision coverage

EAP – we get you help when you need it. At ABC Fitness, we don’t just build technology—we build communities and transform lives. ABC’S COMMITMENT TO DIVERSITY, EQUALITY, BELONGING AND INCLUSION:

ABC is an equal opportunity employer committed to diversity, equity, and inclusion. For us, inclusion isn’t just the right thing to do—it’s a business imperative. ABC Fitness is the #1 software provider for fitness businesses of any size, all around the world. Supporting 30K clubs, 650K coaches, 40M members, and processing more than $12B in payments every year, ABC Fitness provides scalable, data-driven solutions to simplify club management and engage members and clients.

From personal trainers, boutique studios, and gyms, to international franchise health clubs, ABC Fitness will move your business forward through technology and industry insights.