Principal Demo Engineer in London

Fin is the AI Customer Agent company on a mission to help businesses provide perfect customer experiences. Our AI Agent Fin enables businesses to deliver impeccable, always-on customer support across the customer journey – from service, to sales, to ecommerce. Fin resolves complex customer issues end-to-end across every channel, with minimal set-up and integration. Founded in 2011, Fin became one of the fastest growing companies and remains one of the largest private software companies in the world with nearly 30,000 global businesses using our products to transform their customer support.

Fin is an AI-first company revolutionising how customer service is delivered today. Our platform is driven by advanced AI Agents who blend automation with empathy, setting a new standard in customer experiences at scale. At Fin, you’ll help shape the future of AI-first customer experiences, showing our customers the transformative power of artificial intelligence.

As a founding Fin Demo Engineer, you’ll own the platform and tooling that powers every Fin demo at the company - the environments, seeded data, integrations, reset infrastructure, and reusable building blocks our Solutions Engineers rely on every day. You won’t be running demos yourself. You’ll be the force multiplier behind the people who do. Aside from building the systems to support demos, you will embed with our product teams to support net new product releases before they go-to-market.

This role sits at the intersection of Product, GTM, PMM, Enablement and Engineering - with outsized leverage on revenue.

What will I be doing?

• Own the Fin demo platform end-to-end.
• Build first-class demo features into Fin itself.
• Use AI to prepare demos.
• Let SEs move faster.
• Show Fin across every surface it touches.
• Partner with Enablement.
• Stay one step ahead of the product roadmap.
• Codify what works.

What skills do I need?

Must-haves:

• 6+ years building software in a customer-facing technical role - Solutions Engineering, Developer Relations, Founding Engineer, or similar.
• Hands-on AI/LLM product experience.
• Strong full-stack chops: TypeScript on the front end plus one strong backend language (Ruby, Go, or Python).
• Deep familiarity with SDKs, wrappers, and developer-facing APIs.
• RESTful APIs and SaaS integrations are second nature.
• Design sensibility.

Nice-to-haves:

• Background in customer support, contact centre, or CX tooling.
• Experience building internal platforms or developer tooling at scale.
• Experience designing or maintaining multi-tenant demo or sandbox environments.

Benefits:

• Competitive salary and equity in a fast-growing start-up.
• We serve lunch every weekday, plus a variety of snack foods and a fully stocked kitchen.
• Regular compensation reviews - we reward great work!
• Unlimited access to Claude Code and best-in-class AI tools; experimentation & building is encouraged & celebrated.
• Pension scheme & match up to 4%.
• Peace of mind with life assurance, as well as comprehensive health and dental insurance for you and your dependents.
• Flexible paid time off policy.
• Paid maternity leave, as well as 6 weeks paternity leave for fathers.
• Cycle-to-Work Scheme with secure bike storage.
• MacBooks are our standard, but we also offer Windows for certain roles when needed.

Fin has a hybrid working policy. We believe that working in person helps us stay connected, collaborate easier and create a great culture.