Frontend Developer

Senior Frontend Product Engineer | London | Remote | £120,000 - £160,000

We're working with a high-growth, Series A AI startup backed by $30M in funding that is redefining how enterprise systems learn from real-world processes. As a key hire in their Product Engineering team, you will bridge the gap between complex AI research and intuitive user experiences using a modern React-based stack.

This isn't just another SaaS dashboard; you'll be building greenfield interfaces that facilitate human-in-the-loop feedback and continuous learning pipelines. If you are a product-minded engineer who thrives in high-ownership environments, this is your chance to shape the next generation of Applied AI.

The Role

• Lead the front-to-back development of the core platform using React, ensuring the interface is as intelligent as the AI powering it.

• Take full ownership of greenfield projects, from initial architectural design through to global deployment and iteration.

• Partner closely with key enterprise clients to translate complex user requirements into elegant, high-performance UI components.

• Build and optimize interfaces for human-in-the-loop evaluation frameworks, allowing users to train AI models in real-time.

• Collaborate with AI researchers to visualize complex data structures and make machine learning outputs actionable for end-users.

What You'll Need

• Exceptional expertise in React development with a track record of building sophisticated, consumer-grade enterprise frontends.

• A strong product-oriented mindset, with the ability to think beyond code and understand the end-to-end UX/UI journey.

• Experience working in a fast-paced Startup environment or a high-impact 'Big Tech' role with significant autonomy.

• Technical familiarity with modern frontend tooling (TypeScript, Next.js, Redux/Zustand) and API integration patterns.

• Proven ability to handle 'Research-to-Production' workflows, specifically involving data visualization or AI feedback loops.

What's On Offer

• Highly competitive base salary (£120k - £160k) plus meaningful equity in a well-funded, scaling AI venture.

• The opportunity to work alongside world-class talent from top-tier research labs and tech giants.

• A high-degree of creative freedom and the ability to influence the product roadmap from day one.

• Flexible, remote-friendly working culture based out of a central London hub.

Apply via Haystack today!