Senior AI/ML Engineer

The role

You will own the AI quality of live clinical products in the US. You will design agentic systems, build safety systems, and lead eval-driven development for AI therapy and assessment products.

What you will do

• Own the AI quality of a live clinical product end to end.
• Design and build agentic systems including orchestration of specialised agents, tools and memory.
• Build and improve safety systems for real-time risk detection and guardrails.
• Lead eval-driven development using evaluation suites and simulated patients.
• Productionise ML models to optimise product KPIs.
• Help turn clinical AI into composable services for healthcare partners.
• Raise the engineering bar through architecture, code review and mentorship.
• Keep AI continuously compliant with strict regulatory requirements.

Required qualifications

• A PhD in computational science or an AI-related field, plus 2 years of experience in an ML engineering role, OR a BSc/MSc, plus 4 years of experience in an ML engineering role.
• Expertise in productising LLM features and a strong background in eval-driven development.
• Expert-level proficiency in Python and TypeScript/JavaScript.
• Proven experience building an LLM agent harness.
• Experience utilising reinforcement learning.
• Strong architectural skills with experience designing scalable, production-grade systems for machine learning applications.
• A solid understanding of statistical principles in the context of LLM evaluation and user activity analytics.
• Proficiency with version control systems (preferably Git) and databases (SQL or NoSQL).
• Hands-on experience with a major cloud platform and containerisation technologies.
• A track record of end-to-end ownership.
• A genuine interest in applying your technical skills to solve complex challenges in the mental healthcare space.

Nice to have

• Experience with real-time voice AI
• Experience with healthcare organisations as customers

Benefits

• Competitive salary and equity share options.
• Amazing office in central London (Spitalfields).
• 25 days PTO plus bank holidays.
• Company pension scheme (UK).
• Enhanced parental leave packages (UK).
• Support with purchasing work-related books and materials.
• Quarterly Life Days: 4 paid days off per year.
• Mental Health Support: Access to dedicated mental health support services.

Before you apply

• We can consider visa sponsorship for candidates relocating to London.

About the company

Limbic's vision is to ensure the highest quality therapy is accessible to everyone, everywhere. The company has supported more than 820,000 patients across the UK and the US.