Working Student – Quality & Data (m/f/d)

About JawBuddy
JawBuddy helps people with jaw pain, teeth grinding and TMJ problems through a guided exercise app. Our app measures jaw movement through the phone camera using computer vision and AR, so users see their progress in real numbers.
We are a small, funded health-tech team with paying customers in Germany. Next up: a B2B platform release in early 2027.
The role
You make sure our app and our numbers can be trusted, and you use AI to do it at a scale one person couldn't before. AI handles the repetitive checks; you handle what needs human judgment, like testing our camera features in the real world.

- You work directly with our CTO and founding engineer (~12h)

- Data quality (~5h)

- Automation with AI (~3h)

What you'll do

- Test our computer vision in the real world

- Test camera-based jaw tracking across devices, lighting, faces, glasses and beards

- Find the conditions where measurements break, and help the team fix them

- Own app quality

- Own the release checklist for every iOS and Android build

- Test accessibility, German texts, performance, slow networks and offline use

- Write clear bug reports in Linear, with steps to reproduce and evidence

- Keep test evidence documented, as our product requires

- Keep our data trustworthy

- Review the daily data-quality checks across Amplitude, AppsFlyer, RevenueCat and BigQuery, and investigate what they flag

- Find out why two tools disagree, and get it fixed

- Keep our tracking plan in sync with what the app actually sends

- Automate with AI

- Use AI tools to write automated tests (Maestro), generate test cases and run checks

- Review what AI produces: you are the person who decides whether it is right

What you bring

- Enrolled student, available 15–20 hours a week for at least 12 months

- Fluent in English (the app is in German; the team works in English)

- Solid SQL

- A structured, curious way of testing: you find the edge cases others miss

- You already use AI tools (Claude, ChatGPT, Cursor or similar) in your daily work

Nice to have

- Test automation (Maestro, Detox, Appium)

- Accessibility (WCAG, VoiceOver, TalkBack)

- Product analytics (Amplitude, Mixpanel, GA4) or attribution (AppsFlyer)

- dbt or Dataform, Git, Python

- Interest in computer vision, health tech or medical device quality

What we offer

- Real ownership

- You own the release checklist, and when you say a build isn't ready, we listen.

- Work with AI from day one

- You learn how to run quality at scale with AI, a skill few people have yet.

- Rare experience

- Computer vision, health data and quality in a health product, all in one role.

- A path to full-time

- After graduation, this role can grow into a Junior QA Engineer or Data Analyst position.

- Mentorship

- A weekly 1:1 with our CTO.

- Fair pay

- And hours that fit around your lectures and exams.

How we hire

- Send your CV.

- A 30-minute call with our CTO.

- A short paid trial: we send you a test build of the app, and you spend about 2 hours finding and reporting what's wrong. Use any AI tools you like.

- A final conversation, and an offer within a week.

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