Imagine a world where everyone around you creates music – together, in real time. That's the world we started building six months ago. Since then, 100k+ users have created 1M+ songs on Mozart – from shower singers to seasoned artists, including A$AP Rocky's producer. Mozart lets creators translate ideas into professional-grade music in seconds, with as much control as they want.
We've raised $7M+ from Balderton Capital, Kevin Hartz (ex-Eventbrite CEO), Emery Wells (ex Frame.io CEO), and others to make music creation as universal and engaging as music listening.
We're a small, talent-dense team building the future of music from our London office. We operate with high ownership, high velocity, and low-ego collaboration – specialist generalists who work hard, learn fast, and ship relentlessly. We care deeply, and we're here to build something that outlives us.
About the Role
Mobile is a first-class product for us, not an afterthought. You'll own the mobile experience end-to-end: shipping major features, making the app feel Instagram-fast, building a strong React Native foundation, and ensuring subscriptions and revenue state are never wrong. You'll progressively bring more of our creation tools to mobile and work closely with the CTO and Growth Lead.
This role is for someone who's shipped and maintained real React Native apps, cares deeply about performance and polish, and knows that a great mobile product is built in the details
What You'll Do
- Ship major mobile features end-to-end. From spec and prototype to production release, including edge cases, instrumentation, and rollout plans
- Make the mobile feed feel Instagram-fast. Profile and fix jank, optimise lists and media loading, and ship measurable performance improvements with tracked p50/p95 metrics
- Establish React Native architecture and standards. Clear patterns, good practices, and a codebase that scales as we add features (including native audio later)
- Own mobile subscriptions and revenue integrity. Ensure RevenueCat, App Store, and Play Store states are never wrong across purchase, restore, upgrade, downgrade, cancel, grace periods, and refunds
- Build the mobile analytics foundation. Clean event naming, cross-platform parity, reliable attribution/UTMs and funnel events (install → signup → first creation → share → subscribe) so the Growth Lead can make weekly decisions with confidence
- Ship toward App Store featuring. Polish, stability, first-run experience, and release hygiene that make the app feature-ready
- Contribute to the web app when it's high leverage. Shared logic, feature parity, and instrumentation patterns across platforms
What We're Looking For
- React Native expert. Has shipped and maintained RN apps in production to both stores. Knows the real-world pitfalls: navigation, gestures, memory leaks, build tooling, and platform quirks across iOS and Android
- Performance and media feeds. Can make a media-heavy feed feel smooth and fast. Comfortable profiling, optimising lists (FlashList/VirtualizedList), image and video loading, caching, prefetch, and render performance
- Strong mobile architecture. Clear opinions on structure that enables fast shipping. Predictable data flow, local vs global state tradeoffs, offline/online handling, retries, and avoiding re-render traps at scale
- Mobile audio and media. Understands mobile playback and media pipelines: buffering, background audio, interruptions, streaming, caching, and platform-specific quirks
- Payments and subscriptions. Has implemented IAP/subscriptions in production (RevenueCat, StoreKit, Google Billing). Knows the edge cases well: restore, grace period, refunds, upgrades/downgrades, entitlement drift
- Instrumentation and analytics. Designs clean event schemas, ensures cross-platform parity, and makes analytics usable for weekly decisions. Understands funnels, attribution, and data quality
- React web experience. Can contribute to the web app when it's high leverage. Shared logic, feature parity, instrumentation
- Database knowledge. Knows how to connect frontend to backend reliably, securely, and performantly
- Ownership + high velocity + low ego. You care about outcomes after release, not just merges. You ship fast and do whatever it takes for the team
Nice-To-Haves
- Native iOS or Android experience (Swift/Kotlin) for platform-specific fixes and optimisations, especially around audio
- Experience with media-heavy mobile apps (audio/video streaming, CDN-backed delivery, offline caching and sync)
- Familiarity with App Store and Play Store best practices for improving presence and ranking
- Some database expertise to support the team's relational database migration when needed
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