Founding Frontend Engineer — Real-Time Music Studio

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

Job summary

Mozart AI in London seeks a senior frontend engineer to own the rendering architecture and state management across the client and server. You will drive the delivery pipeline, implement robust observability, and lead important refactors using AI-assisted verification.

This in-person role offers rapid career growth in a fast-paced startup environment. You will shape end-to-end features with careful testing, measurable user impact, and a focus on delivery quality.

Qualifications

• 5+ years of professional software development experience.
• Experience with large React codebases and design systems.
• Proven ability to lead migrations and refactors.

Responsibilities

• Own our client- and server-side rendering architecture and data flow.
• Own the state management architecture across the app.
• Own the delivery pipeline with CI/CD and canary deploys.
• Make production observable with strong error handling and monitoring.
• Lead refactors that matter using AI agents and verification systems.
• Own frontend testing across layers, including E2E testing in CI.
• Ship end-to-end features with fast iteration based on user signals.

Skills

React depth

State management

SSR in production

Server-push architecture

Delivery infrastructure

Refactor leadership

Testing judgment

Agent-native

Truth seeker

Product taste

High ownership, low ego

5+ years experience

Tools

TanStack Start

Next.js

Redux

Zustand

Jotai

CI/CD

Source maps

Job description

Mozart AI in London seeks a senior frontend engineer to own the rendering architecture and state management across the client and server. You will drive the delivery pipeline, implement robust observability, and lead important refactors using AI-assisted verification.

This in-person role offers rapid career growth in a fast-paced startup environment. You will shape end-to-end features with careful testing, measurable user impact, and a focus on delivery quality.