Founding Backend Engineer: Real-Time Music Collaboration

Mozart AI; Greater London; On-site; GBP 90,000 - 130,000; Full time

Job summary

Mozart AI in London is seeking a backend-focused engineer to own APIs, design the media generation backbone, and run media at scale across audio, video, and images. You will shape the core data model for DAW sessions, social graphs, and collaboration features, while supporting payments and observability.

This in-person role offers the chance to impact billions of potential music creators and fans as the platform evolves weekly, with high ownership and fast delivery expectations.

Qualifications

• Experience designing contracts used by web, mobile, and internal tools.
• Built multi-service workflows with clear failure modes.
• Modelled complex, evolving data domains with history and concurrency.
• Experience with media processing pipelines and real-time collaboration.

Responsibilities

• Own the API surface and end-to-end contracts for multiple clients.
• Build the media generation backbone across providers and integrations.
• Manage media at scale: upload, transcoding, storage, and delivery.
• Design relational, versioned data models across sessions and social graphs.
• Ship real-time collaboration features with presence and shared state.
• Own payments, subscriptions, credits, and refunds.
• Make the platform observable with traces, logs, and metrics.
• Develop CI/CD for agents and ensure reliable deployments.
• Design for constant change with zero-downtime migrations.

Skills

APIs design

Distributed systems

Domain modeling

Media pipelines

Billing & subscriptions

AI-native tooling

Ownership & velocity

5+ years experience

Tools

CRDTs

Job description

Mozart AI in London is seeking a backend-focused engineer to own APIs, design the media generation backbone, and run media at scale across audio, video, and images. You will shape the core data model for DAW sessions, social graphs, and collaboration features, while supporting payments and observability.

This in-person role offers the chance to impact billions of potential music creators and fans as the platform evolves weekly, with high ownership and fast delivery expectations.