AI/ML Engineer

The role

You will build an AI therapist voice agent that delivers structured CBT to adults with depression and anxiety. You will work at the intersection of computational psychiatry, clinical science, and software engineering to improve session structure, safety systems, and evaluations.

What you will do

• Improve how the AI therapist runs sessions including structure and therapeutic techniques
• Strengthen safety systems including risk detection and agent responses
• Build evaluations and LLM-as-judge autolabellers
• Make voice conversations feel natural and responsive
• Help patients stay with treatment through AI features and experiments
• Optimise collection of outcome measures like PHQ-9 and GAD-7
• Ship changes through incremental rollouts and clinical sign-off

Required qualifications

• A PhD in Computational Psychiatry or a related field, coupled with demonstrated industry experience in Data Science, Product, or ML engineering
• OR A BSc/MSc in a Computational Psychiatry related field (research focus) plus 2 years of experience in ML engineering or Data Science within an Engineering/Product Development environment
• Proficiency in either Python or TypeScript/JavaScript
• Experience building LLM-powered features and a track record of eval-driven development
• An expert approach to hypothesis-driven work
• Experience using Machine Learning in a production environment or via high-impact scientific publications
• Experience modelling text/language data, including building LLM classifiers and using vector-based methods
• Experience modelling longitudinal data and working with databases (SQL or NoSQL)
• A strong understanding of evidence-based mental health care
• A bias to action
• Proficiency with version control systems, preferably Git

Nice to have

• Experience building an LLM agent harness or real-time voice AI

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

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.