Join a talent-dense team of eight building the future of music creation. You will own major product milestones end-to-end for a platform already serving 100k+ users. You'll lead a critical migration to server-side rendering and redesign the frontend architecture, ensuring the codebase remains scalable and performant as the product evolves rapidly.
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London, United Kingdom£60k-£100k + Equity
Mid-level Frontend Engineer at Mozart AI
Join Mozart AI, a high-growth startup backed by $7M from Balderton Capital and the founders of Eventbrite and Frame.io. We are looking for a Mid-level Frontend Engineer to help us build the future of music creation. With over 100k users and 1 million songs already created, you'll own major features end-to-end, lead a migration to Next.js, and redesign our architecture for scale. If you have 3-5 years of experience, a passion for clean React code, and want to work on a product used by everyone from hobbyists to world-class producers, this is your chance to join a talent-dense team in London with significant equity.
Overview
Role overview
Company
Mozart AI
SoftwareLondon, United KingdomPre-Seed (VC-backed)
Mozart AI - VC-backed Generative Audio platform with $7M+ raised from Balderton Capital and the founders of Eventbrite and Frame.io.
Backed by EWOR, New Renaissance Ventures, Atlantis Ventures, Felix Jahn, Stefan Glaenzer.
Responsibilities
What you will do
- Redesign the frontend architecture to establish clean component structures and scalable state management patterns using React and TypeScript.
- Lead the incremental migration to server-side rendering (Next.js) to optimize SEO and performance for high-value user-facing pages.
- Partner with backend engineers to execute a critical database migration from non-relational to relational systems with zero data loss.
Candidate profile
Who this is a fit for
- 3-5 years of experience with deep expertise in React internals, TypeScript mastery, and professional-grade state management (Zustand/Redux).
- Proven track record of shipping server-side rendering (SSR) in production environments and managing complex, media-heavy frontend performance.
- A founding-team mindset characterized by high velocity, low ego, and a first-principles approach to solving technical and product challenges.
What makes it remarkable
Why this role is remarkable
- Work on a category-defining product backed by top-tier investors like Balderton Capital and industry icons from Eventbrite and Frame.io.
- Exceptional traction with 1M+ songs already created by a diverse user base ranging from shower singers to A$AP Rocky’s producer.
- High-impact founding culture where you have significant equity and the autonomy to shape the architectural future of a high-growth AI startup.
Jack & Jill
How Jack & Jill work together
I get to know what you’re great at, then find roles you’d never find yourself.Ok, I'll go first. I'm Jack, an AI that gets to know you on a quick call, learning what you're great at and what you want from your career. Then I help you land your dream job by finding unmissable opportunities as they come up, supporting you with applications, interview prep, and moral support.
I recruit from Jack’s network and make the intro when I spot a great match.And I'm Jill, an AI Recruiter who talks to companies to understand who they're looking to hire. Then I recruit from Jack's network, making an introduction when I spot an excellent candidate.
Meet Jack
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How does this work?
Jack's an AI agent for job searching and career coaching. He works for you.
Jill is the AI recruiter working for the company. She recruits from Jack's network.
If it's a match and the company wants to meet you, they'll make the intro. In the meantime, if you'd like, Jack will send you excellent alternatives.
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