Join a talent-dense team of eight building the future of music creation. As a Backend Engineer, you will architect the foundation for millions of users, transitioning from NoSQL to Postgres while scaling media pipelines and payments. This is a high-ownership role for a systems-thinker ready to ship relentlessly in a fast-growing startup.
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London, UK£60k-£100k + Equity
Featured roleLondon, UK£60k-£100k + Equity
Backend Engineer at Mozart AI — VC-backed Music AI
Join Mozart AI, the VC-backed startup revolutionizing music creation for over 100k users. We are looking for a Backend Engineer to own our core infrastructure—from leading a massive NoSQL to Postgres migration to scaling media pipelines that power professional-grade music generation. Backed by $7M from Balderton Capital and industry icons, this is your chance to join a talent-dense London team and build the 'Generative Audio Workstation' of the future. If you are a systems-thinking engineer who loves music and high-velocity shipping, this is the role for you.
Overview
Why this role stands out
Company
Responsibilities
What you will do
- Lead the end-to-end migration from non-relational to relational databases, ensuring zero-data-loss cutovers and canonical schema design.
- Own the payments and entitlements backbone using Stripe and RevenueCat to handle complex subscription lifecycles and cross-platform parity.
- Architect high-concurrency REST APIs and reliable media processing pipelines with global delivery via CDN caching and signed URLs.
Candidate profile
Who this is a fit for
- Has 3-5 years of experience with Node.js/TypeScript and deep expertise in relational SQL schema design and migrations.
- Demonstrates a production-ownership mindset with strong instincts for CI/CD, observability, and graceful degradation in high-traffic environments.
- Thrives in a high-velocity startup culture, acting as a "specialist generalist" who cares deeply about outcomes after the code is merged.
What makes it remarkable
Why this role is remarkable
- Work at the intersection of AI and creativity on a product used by 100k+ creators, including producers for A$AP Rocky and Avicii.
- Backed by $7M+ from top-tier investors including Balderton Capital and the founders of Eventbrite and Frame.io.
- High-impact ownership of critical infrastructure, from database migrations to real-time collaboration primitives in a rapidly scaling environment.
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.
About Jack & Jill
Meet Jack
Jack gets to know what you are great at, what you want next, and makes sure Jill considers you for the right opportunities.
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.
Jack