This is a job that Jill, our AI Recruiter, is recruiting for on behalf of one of our customers.
She will pick the best candidates from Jack's network
The next step is to speak to Jack.
Job Title: Backend Engineer
Salary: £60k-£100k + Equity
Company Description: Mozart AI - VC-backed Generative Audio Workstation
Job Description:
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.
Location: London, UK
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.
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.
The ideal candidate:
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.
Who are Jack & Jill?
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.
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.
Next steps
Step 1. Visit our website.
Step 2. Click 'Talk to Jack'.
Step 3. Talk to Jack so he can understand your experience and ambitions.
Step 4. Jack will make sure Jill (the AI agent working for the company) considers you for this role.
Step 5. If Jill thinks you're a great fit and her client wants to meet you, they will make the introduction.
Step 6. If not, Jack will find you excellent alternatives. All for free.
We never post fake jobs
This isn't a trick. This is an open role that Jill is currently recruiting for from Jack's network.
Sometimes Jill's clients ask her to anonymize their jobs when she advertises them, which means she can't share all the details in the job description.
We appreciate this can make them look a bit suspect, but there isn't much we can do about it.
Give Jack a spin! You could land this role. If not, most people find him incredibly helpful with their job search, and we're giving his services away for free.
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