Junior Data & Machine Learning Specialist (Contract)

About the roleWe're looking for a builder who wants to ship an app people actually train with.
We're building a training app that makes the gear people already own more useful. Alongside it we're running a wearable research program testing whether affordable sensors can give people better coaching. You'll take raw sensor movement recordings and turn them into datasets we can trust and findings we can test. You'll work with the founder, our engineers, our coaches and the full-stack developer.
You don't need years of experience. You need to care about getting the data right and be honest about what a result does and doesn't prove.
What's in it for you
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
Employee discounts on all our gear
Access to our staff gym
A team that actually likes what they do
The schedule & locationThis is a
hybrid
role based at our Calgary location, where the core hours are
Monday to Friday from 8:00am to 4:30pm
The non-negotiablesYou build with Claude Code every day, and you check its work.
You can explain every script and analysis you hand us, and you've verified the results hold up. Fast matters. Shipping slop doesn't.
You lift.
You know sets, reps, RPE, progression and rest periods, and you're at home around barbells, racks, benches, dumbbells and cable machines. No coaching cert needed. You can't label a squat rep well if you've never done one.
You're in Calgary.
You live here or you'll move here before your start date. 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.
What you'll do
Build and maintain Python/SQL tools that pull in and check sensor recordings, workout logs and reference measurements
Keep every dataset traceable: participant IDs, exercise, gym and equipment setup, sensor placement, timestamps, consent, labels and version
Run collection checklists with the testing team, and catch missing samples, timing errors and bad labels before they reach an experiment
Build simple baselines and documented ML experiments, with reproducible configs and evaluation on properly separated users and sessions
Write up errors and limitations, keep the negative results, and maintain records and interfaces the app team can use
What Success Looks Like
Day 30:
you've reproduced an existing analysis and built a checked dataset for one exercise and sensor setup
Day 60:
reference-data checks and baseline comparisons are running under an approved protocol
Day 90:
you own a reproducible dataset-to-evaluation workflow and a clear error report that feeds the next sensor decision
Nothing becomes coaching in the app until it's been validated, and you're the reason we know
What We're Looking For
Practical Python, data wrangling, SQL and Git. You can turn a notebook into a repeatable script and write checks for your own assumptions
A foundation in stats and ML: keeping training and validation data separate, spotting overfitting, comparing against a baseline
At least one real project, from a job, research, a capstone or something substantial you built on your own.
New grads and people with 1–3 years of experience welcome
Patience with messy data, curiosity about where things break, and the ability to explain what a result does and doesn't show
Experience with iOS and Android development
Bonus Points
Time-series analysis, signal processing, wearable sensors or biomechanics
pandas/NumPy, scikit-learn or PyTorch
Versioned data pipelines
A relevant degree or diploma (equivalent ability counts just as much). No PhD or production experience required. Coaches and engineers support the reference sessions and help interpret results.
We care more about what you've built than where you learned it.
The Interview Process
30 minute screening with our HR Coordinator
1 hour screening with our hiring team
Paid, time-bound technical assessment
1 hour technical follow-up to discuss assessment
Decision made and offer sent out
About Bells of Steel Inc.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.
We’re not your typical fitness equipment brand. We’re down-to-earth, a little cheeky, and focused on making fitness more rewarding and less intimidating. If you enjoy a fast-paced, no-BS environment and want to help shape the future of strength training, you’ll fit right in.
Our Core Values: A.C.T.Adaptability – Raise the BarWe challenge the status quo, learn quickly, and continuously improve. We embrace change, seek better ways of working, and take initiative to drive results.
Customer Centricity – Always Spot the CustomerEverything 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.
Teamwork – We Win TogetherWe operate with honesty, transparency, trust, and respect. We collaborate openly, take shared ownership of outcomes, and succeed as a team.
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