As Founding Frontend Engineer at Mozart AI, you will own the entire frontend architecture, managing a complex stack including React, WebGL, and TanStack Start. You’ll tackle extreme performance challenges—like rendering 30k rectangles at 60fps—and build the “backend of the frontend” to ensure a seamless, professional experience for music creators worldwide.
Founding Frontend Engineer at Mozart AI
Mozart AI is building a generative audio workstation to revolutionize music creation, and they’re looking for a Founding Frontend Engineer to own their entire UI architecture. Backed by $6M from Balderton Capital, this role involves tackling extreme performance challenges like 60fps WebGL rendering and managing a 3M-line React codebase. If you have around 5 years of experience, startup grit, and want to build a professional-grade DAW in an intense, in-office London environment, this is your chance to shape the technical direction of a category-defining product alongside a high-caliber founding team.
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Location
London, United Kingdom
Compensation
£120k + Equity
Company
Mozart AI
Role overview
Software10 employeesLondon, United KingdomPre-Seed (VC-backed)
Mozart is building a world where everyone can feel the joy of creating music, socially. Our customers range from grandmas using Vibe sessions to Grammy winners using the Studio. Music is entering its first explosive moment of creation-driven consumption, and we want to shape that world while preserving the social, fun side of music creation. We’ve raised over $7m from Balderton Capital (backers of Revolut) and Silicon Valley legends like Kevin Hartz, Emery Wells, backers of Uber, Spotify, etc.
Backed by EWOR, New Renaissance Ventures, Atlantis Ventures, Felix Jahn, Stefan Glaenzer.
What you will do
- Architect and own the “backend of the frontend,” including complex state management (Zustand), SSR/CSR strategies, and real-time streaming via WebSockets.
- Develop and maintain a high-performance design system and testing infrastructure (unit, integration, and e2e) to support rapid, large-scale consumer deployments.
- Collaborate directly with the CTO to shape the technical direction of the product and integrate sophisticated AI-driven audio features into the UI.
Who this is a fit for
- Approximately 5 years of professional frontend experience with deep expertise in TypeScript, React, and modern state management libraries.
- Proven “Startup DNA” with experience as a founding engineer or early employee at a fast-growing consumer brand with high engineering standards.
- Ability to thrive in an intense, in-office London environment, working a 6-day week to build a category-defining creative tool.
Why this role is remarkable
- Work on a performance-critical generative audio workstation featuring a WebGL renderer running at 60fps and managing 3M lines of React code.
- Join a high-intensity, $6M seed-funded team backed by Balderton Capital as a founding member with significant equity and technical ownership.
- Build a generational product that moves beyond basic AI generation into professional DAW features like stems, instruments, and individual note control.
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If your profile’s a match and Mozart AI wants to meet, Jill will make the intro. In the meantime, Jack will send you excellent alternatives.