Senior Technical Lead (Full-Stack & Applied ML) (Contract) We're building a training app that makes the gear people already own more useful. Our founder built the working version, and it's in private TestFlight testing now. Alongside it we're running a wearable research program testing whether affordable sensors can give people better coaching.

You’ll be the technical owner of both. You'll take a real app to public launch and keep it running, and you'll design the sensor and ML experiments that tell us what actually works. This is hands-on: you write the code, look at the data and make the calls.

public app launch in This is a 6-month contract role ending in March 2027, with the potential to transition to full-time based on performance and business needs

Health Spending Account A Calgary office you’ll actually want to come into

Monday to Friday from 8:00am to 4:30pm

You know sets, reps, RPE, progression and rest periods, and you're at home around barbells, racks, benches, dumbbells and cable machines. You do need to understand what our customers are doing in their garage.

The job is hybrid but you are expected to come on-site around 3 times a week to work with our equipment, coaches and product team, so remote from another city or country won't work.

Take our React Native/Expo and TypeScript app, Supabase/Postgres backend and local-first data through release, monitoring and day-to-day operation

Build the hard backend and data pieces yourself: reliable sync, access control, sensor ingestion, versioned datasets, model interfaces, and failures we can actually see

Work with our team of 2 in-house personal trainers, 2 biomechanical engineers and the visionary to design the wearable measurement and ML experiments: reference comparisons, straightforward baselines, participants and sessions kept separate,



uncertainty estimates and honest limits on what we release

Turn validated findings into coaching features with confidence checks, a manual fallback, and sensible behaviour when the signal is missing or unreliable

Set technical priorities with the visionary, review AI-assisted code and analysis, and keep decisions and experiment records reproducible The app is on track for its December public launch on Android, iOS and web

You've shipped production mobile apps and supported them after launch

You've personally built and properly evaluated an applied ML system, and that evaluation drove a real product or deployment decision

Strong backend, SQL, API and authorization skills, plus practical React/TypeScript. Python, statistics and applied ML fundamentals. You've owned technical design and made delivery calls on your own. You improve an existing codebase instead of rewriting it, ship small releases you can verify, and explain trade-offs in plain language

Experience with iOS and Android development

Experience with BLE data capture

Bonus Points

React Native/Expo and Supabase

Wearable or time-series data, signal processing

You own the app, the data pipeline and the ML calls. Paid, time-bound technical assessment

1 hour follow up to discuss technical assessment

At Bells of Steel, our mission is to make fitness and strength training approachable, affordable, and fun. We design and manufacture high-quality strength and exercise equipment for home gym owners and fitness professionals, helping people of all experience levels achieve their goals.

If you enjoy a fast-paced, no-BS environment and want to help shape the future of strength training, you'll fit right in.

Customer Centricity – Always Spot the Customer

Everything we do is focused on helping our customers succeed. We lead with empathy, build trust through action, and create value for both external and internal customers.

📌 Senior Technical Lead (Full-Stack & Applied Ml) (Contract)
🏢 Bells of Steel
📍 Calgary