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

<h2>About JawBuddy</h2><p>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.</p><p>We are a small, funded health-tech team with paying customers in Germany. Next up: a B2B platform release in early 2027.</p><h2>The role</h2><p>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.</p><ul><li><p>You work directly with our CTO and founding engineer (~12h)</p></li><li><p>Data quality (~5h)</p></li><li><p>Automation with AI (~3h)</p></li></ul><h2>What you'll do</h2><ul><li><p>Test our computer vision in the real world</p></li><li><p>Test camera-based jaw tracking across devices, lighting, faces, glasses and beards</p></li><li><p>Find the conditions where measurements break, and help the team fix them</p></li><li><p>Own app quality</p></li><li><p>Own the release checklist for every iOS and Android build</p></li><li><p>Test accessibility, German texts, performance, slow networks and offline use</p></li><li><p>Write clear bug reports in Linear, with steps to reproduce and evidence</p></li><li><p>Keep test evidence documented, as our product requires</p></li><li><p>Keep our data trustworthy</p></li><li><p>Review the daily data-quality checks across Amplitude, AppsFlyer, RevenueCat and BigQuery, and investigate what they flag</p></li><li><p>Find out why two tools disagree, and get it fixed</p></li><li><p>Keep our tracking plan in sync with what the app actually sends</p></li><li><p>Automate with AI</p></li><li><p>Use AI tools to write automated tests (Maestro), generate test cases and run checks</p></li><li><p>Review what AI produces: you are the person who decides whether it is right</p></li></ul><h2>What you bring</h2><ul><li><p>Enrolled student, available 15–20 hours a week for at least 12 months</p></li><li><p>Fluent in English (the app is in German; the team works in English)</p></li><li><p>Solid SQL</p></li><li><p>A structured, curious way of testing: you find the edge cases others miss</p></li><li><p>You already use AI tools (Claude, ChatGPT, Cursor or similar) in your daily work</p></li></ul><h2>Nice to have</h2><ul><li><p>Test automation (Maestro, Detox, Appium)</p></li><li><p>Accessibility (WCAG, VoiceOver, TalkBack)</p></li><li><p>Product analytics (Amplitude, Mixpanel, GA4) or attribution (AppsFlyer)</p></li><li><p>dbt or Dataform, Git, Python</p></li><li><p>Interest in computer vision, health tech or medical device quality</p></li></ul><h2>What we offer</h2><ul><li><p>Real ownership</p></li><li><p>You own the release checklist, and when you say a build isn't ready, we listen.</p></li><li><p>Work with AI from day one</p></li><li><p>You learn how to run quality at scale with AI, a skill few people have yet.</p></li><li><p>Rare experience</p