Founding AI Product Engineer

Harnham; Greater London; Híbrido; GBP 126 000 - 154 000; Tempo integral

Vantagens oferecidas por esta oferta de emprego

Equity

Hybrid work in London

Equity package

Resumo da oferta

Harnham is partnering with a well-funded early-stage AI startup to hire an AI Product Engineer in London. This founding-level role focuses on building AI-powered products from concept through production, shaping architecture and engineering standards, and delivering real-world AI deployments.

You will own end-to-end product delivery, drive LLM-enabled solutions, and work closely with senior leadership in a small, high-caliber team. Equity and hybrid London work arrangement are offered.

Qualificações

• 5+ years of Product Software Engineer with end-to-end ownership.
• Proven experience building and launching an LLM-enabled product from 0→1.
• Experience taking AI products into real-world production environments.
• High ownership mindset and ability to operate autonomously.
• Strong communication and stakeholder management skills.
• Previous startup or fast-growth environment experience.

Responsabilidades

• Building AI-powered products from concept through to production.
• Developing and scaling LLM-enabled applications and services.
• Designing backend systems, APIs and platform architecture.
• Owning retrieval, generation and evaluation pipelines.
• Improving AI quality, reliability, monitoring and cost optimisation.
• Working across product, engineering and customer teams to deliver business value.
• Establishing engineering best practices within an early-stage environment.

Conhecimentos

Node.js

TypeScript

API design

Platform engineering

LLMs in production

AI monitoring

Cost optimisation

Stakeholder management

Ferramentas

React

Descrição da oferta de emprego

London (Hybrid) | Up to £140,000 + Equity

We're partnered with a well-funded early-stage AI startup building a next-generation behavioural intelligence platform used by large enterprise organisations. Having recently secured significant pre-seed funding and already working with major customers, they're now looking for a Founding

AI Product Engineer to play a key role in scaling the product from early traction to commercial growth.

This is a genuine 0→1 opportunity. You'll join a small, high-calibre team and take ownership of building and scaling AI-powered products that help organisations better understand customer behaviour, decision-making and engagement. You'll work directly with senior leadership and have a major influence on product direction, architecture and engineering standards.

You'll be responsible for:

• Building AI-powered products from concept through to production
• Developing and scaling LLM-enabled applications and services
• Designing backend systems, APIs and platform architecture
• Owning retrieval, generation and evaluation pipelines
• Improving AI quality, reliability, monitoring and cost optimisation
• Working across product, engineering and customer teams to deliver business value
• Establishing engineering best practices within an early-stage environment

What We're Looking For

• 5+ years of Product Software Engineer with experience owning products end-to-end
• Proven experience building and launching an LLM-enabled product from 0→1
• Experience taking AI products into real-world production environments
• High ownership mindset and ability to operate autonomously
• Strong communication and stakeholder management skills
• Previous startup or fast-growth environment experience

Technical Experience

• Node.js / TypeScript preferred
• API and platform engineering experience
• Experience working with LLMs in production
• Understanding of AI evaluation, monitoring and quality frameworks
• Experience managing token usage, latency and AI infrastructure costs
• React experience beneficial but not essential

Nice to Have

• Experience within successful AI startups or leading technology companies
• Financial Services or regulated industry exposure

Why Join?

• Founding-level engineering opportunity with significant ownership
• Meaningful equity package
• Backed by substantial early-stage funding
• Opportunity to shape the engineering culture and product roadmap
• Small, highly talented team building at the forefront of applied AI
• Direct exposure to enterprise customers and real-world AI deployment challenges
• Fast-moving environment with significant scope for progression

Package

• Up to £140,000 base salary
• Meaningful equity
• Hybrid working in London (Liverpool Street area)
• Typically 2-4 days per week in the office
• This role cannot sponsor