At a Glance
- Tasks: Shape an innovative AI product and influence its development from the ground up.
- Company: Exciting early-stage AI startup with significant funding and a focus on behavioural intelligence.
- Benefits: Competitive salary, equity options, and the chance to make a real impact.
- Other info: Opportunity for rapid career growth in a dynamic startup environment.
- Why this job: Join a small team and drive the future of AI technology in enterprise solutions.
- Qualifications: Experience in product software engineering and strong backend skills, especially with APIs.
The predicted salary is between 115000 - 140000 £ per year.
This is a rare opportunity to join a well-funded early-stage AI business as one of the first senior engineering hires. You will play a pivotal role in shaping a greenfield AI product, owning technical decisions, influencing the roadmap, and helping build an enterprise-grade platform used by leading organisations.
THE COMPANY
They are an AI startup developing advanced behavioural intelligence technology for enterprise customers. Their platform helps organisations better understand customer behaviours, preferences, and decision-making patterns to improve communications, customer engagement, and product experiences. Having secured significant early-stage funding, they are now working with major enterprise clients and are focused on scaling their product from proof of concept into wider commercial deployment. With a small, highly experienced team, they offer the opportunity to make a meaningful impact from day one.
THE ROLE
As a Senior Product Engineer, you will take ownership of product development alongside senior leadership, helping transform innovative AI capabilities into a scalable commercial platform. Specifically, you can expect to be involved in the following:
- Building and scaling a production-grade AI product from the ground up
- Designing and developing APIs and backend services that power enterprise customer integrations
- Owning the LLM application layer, including retrieval-augmented generation (RAG) workflows
- Improving model performance, reliability, evaluation frameworks, monitoring, and cost optimisation
- Working across the stack to deliver customer-facing features and platform capabilities
- Collaborating with stakeholders to translate customer feedback into product improvements
- Establishing engineering best practices across architecture, testing, deployment, and delivery
- Contributing to technical strategy and product roadmap decisions
SKILLS AND EXPERIENCE
The successful Senior Product Engineer will have the following skills and experience:
- Strong commercial experience as a Product Software Engineer or Software Engineer
- Experience building and scaling an LLM-enabled product from concept through to production
- Strong backend engineering expertise, ideally within API-first products
- Experience with Node.js and TypeScript, or a proven ability to transition successfully between technology stacks
- Understanding of RAG architectures, evaluation frameworks, guardrails, monitoring, and model optimisation
- Experience managing token usage, infrastructure costs, and scalability challenges in AI products
- Comfortable working autonomously in a startup or high-growth environment
- Strong product mindset with the ability to make technical and commercial decisions
- Excellent communication and stakeholder management skills
- React experience is beneficial but not essential
- Experience within Financial Services or other regulated industries would be advantageous
BENEFITS
The successful Senior Product Engineer will receive the following benefits:
- Salary between £115,000 - £140,000 - depending on experience
- Equity
Senior Product Engineer employer: Harnham
As a leading specialist data consultancy, we pride ourselves on fostering a collaborative and innovative work culture that empowers our Analytics Engineering Consultants to thrive. With a focus on professional development, we offer extensive growth opportunities and the chance to work on high-impact projects across diverse industries, all while enjoying the flexibility of remote work in the UK. Join us to be part of a team that values your expertise and encourages you to influence strategy and drive meaningful change for our clients.
