Mobile QA Tester

Mobile QA Tester — London (Hybrid) Paid hourly | Internship with the possibility to extend Juno (YC P26) is building a 24/7 AI health companion for people living with chronic illness. We are a small, fast-moving team, and quality is mission-critical: people rely on Juno with real health questions every day. We are looking for a sharp, relentless Mobile QA Tester with hands-on mobile development experience—someone who understands how mobile apps are built as well as how they break. This is a high-ownership role working directly with the founder, product and engineering. You will own release testing, hunt down edge cases and have a visible impact on what reaches users. What you will do Test iOS and Android builds across devices, OS versions and critical user journeysRun smoke, regression, exploratory, usability and edge-case testing before releasesReproduce and document bugs with precise steps, screenshots or recordings, severity and expected vs actual behaviourUse your mobile development knowledge to investigate logs, network behaviour, state, permissions and device-specific failuresValidate TestFlight and release candidates, including onboarding, authentication, notifications, subscriptions, deep links, offline and poor-network behaviourVerify fixes quickly and keep release checklists and test cases accurateWork closely with product, design and engineering to improve quality at every stage Required Hands-on mobile development experience is requiredPrior App Store experience is mandatory: you must have personally developed and/or QA-tested at least one consumer mobile app that was publicly released on the Apple App StoreYou must be able to name that app and explain exactly what you built, tested and ownedStrong manual mobile QA skills and a genuine instinct for finding hard-to-reproduce bugsFamiliarity with TestFlight and the iOS release processExcellent attention to detail and clear written bug reportingBased in London, or able to work hybrid with regular in-person time in LondonHigh ownership, speed and comfort working in an early-stage startup Nice to have Android and Google Play testing experienceExperience with React Native or Expo appsFamiliarity with API or network debugging, Sentry, analytics, accessibility testing or QA automationInterest in healthtech, consumer apps or AI products What we offer Paid hourly internshipHybrid working in LondonReal ownership of a live product used by people managing chronic illnessDirect access to the founder and a fast feedback loop with product and engineeringThe possibility to extend into a longer-term role based on performance, company needs and mutual fitA front-row seat at a Y Combinator startup moving quickly from user feedback to shipped product How to apply Please include The name and App Store link for a mobile app you personally developed and/or testedExactly what you built or tested on that appOne difficult bug you found and how you diagnosed itYour London availabilityYour hourly rate expectation Applications that do not identify a real published app and your personal contribution will not be considered. If you are obsessed with breaking mobile apps before users do—and want your work to matter immediately—we would love to hear from you.