Artificial Intelligence Engineer

HartleyCo; Greater London; Hybrid; GBP 80,000 - 140,000; Full time

Benefits offered by this job

Equity included

Job summary

HartleyCo is seeking a Senior AI Engineer to develop and scale their innovative AI platform for clinical trial validation. This fully remote role involves direct collaboration with the CTO and focuses on building RAG systems, iterating on LLM workflows, and improving output quality through eval pipelines. Candidates with a startup background and strong software engineering fundamentals thrive in this position, with a competitive salary range of £80K–£140K based on experience.

Qualifications

• Proven production experience with RAG systems and agentic LLM pipelines.
• Experience in a fast-moving 0-to-1 startup environment.
• Strong software engineering fundamentals with a focus on reliability.

Responsibilities

• Build and ship RAG pipelines for AI co-pilots in clinical documentation.
• Design agentic LLM workflows with a graph-based data engine.
• Set up evaluation pipelines for continuous output quality improvement.
• Translate customer feedback into actionable features.

Skills

RAG systems

LLM pipelines

Software engineering fundamentals

Startup experience

Job description

Senior AI Engineer | Seed-Stage HealthTech | Fully Remote | £80K-£140K

We're partnered with a startup that's transforming how drugs get approved and reach patients.

They've built an AI platform that replaces one of pharma's most expensive and time-consuming manual processes, clinical trial validation, and have just proved the concept with a major global pharmaceutical company, cutting internal timelines by over a year. They're close to closing a Series A, scaling off the back of multi-million pound contracts, and this is hire number one of several.

They need a hands-on Senior AI Engineer to work directly alongside the CTO, owning the architecture and delivery of RAG systems, agentic LLM workflows, and core AI infrastructure from day one. A building role, the vast majority of your time will be spent writing code and shipping features, not managing or researching.

What you’ll work on

• Building and shipping RAG pipelines that power AI co-pilots for clinical documentation
• Designing and iterating on agentic LLM workflows grounded in a graph-based data engine
• Setting up eval pipelines to track and continuously improve output quality
• Working directly with the founding team to translate customer feedback into shipped features

What they’re looking for

• Proven production experience with RAG systems and agentic LLM pipelines
• Startup background, you've worked in a fast-moving 0-to-1 environment and thrived
• Strong software engineering fundamentals, reliability over prototypes
• Founding engineer mindset: ownership, speed, bias towards action
• Regulated industry experience is a plus, not a requirement

Compensation and logistics

• £80,000 to £140,000 depending on experience
• Fully remote, London candidates preferred
• Equity included

Interested or know someone who might be? Drop a comment or send a direct message.