Lead Software Developer

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. On the lookout for a Lead Backend Developer to join Trainerize powered by ABC Fitness Solutions (www.trainerize.com). 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. This is a Canada-based individual contributor role. You will lead through technical direction, influence, code quality, mentoring, and cross-functional partnership — not through people management. If that vision excites you, this is where it gets built. 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. **RESPONSIBILITIES:** - Design, develop, test, and document software for existing and new products - Build, maintain, and optimize .NET backend services (http://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) - Own API strategy: set standards for design, versioning, security, and cross-team contracts, including third-party integration surfaces - Establish and uphold team practices and guardrails for agentic-IDE development (Cursor or similar), including review standards for agent-generated code - 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 - Lead and coach junior and intermediate developers; raise the bar through pairing and feedback - Improve engineering practices and processes (testing, observability, release discipline) in ways that fit the team - Share ownership of production health: monitor, respond to critical incidents, and drive fixes for instability or regressions **QUALIFICATIONS:** - Bachelor's Degree in Computer Science or a related field - Typically, 7+ years of .NET experience and/or other object-oriented programming languages - Experience with Microsoft Visual Studio - Familiar with C#, WebAPIs, MVC, http://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 - Work effectively in a cloud-based environmen…