Founding Backend Engineer - AI/ML

Founding Backend Engineer – AI/HealthTech | Hybrid (London)

Hybrid | 2–3 days/week in-office (Euston)

Full-time | Permanent

We’re helping build the future of clinical decision support and looking for a Founding Backend Engineer to lead the charge. This is a rare opportunity to shape the technical foundation of an AI-powered platform designed to support frontline clinicians with instant, evidence-based answers.

You’ll join a small, mission-driven team working at the intersection of healthcare and cutting-edge LLM technology, shipping fast and solving meaningful problems every day.

What You’ll Own

• Architect and develop backend microservices (Python/FastAPI) that power our RAG pipelines and analytics
• Build scalable infrastructure for retrieval and vector search (PGVector, Pinecone, Weaviate)
• Design evaluation frameworks to improve search accuracy and reduce hallucinations
• Deploy and manage services on GCP (Vertex AI, Cloud Run, BigQuery) using Terraform and CI/CD best practices
• Collaborate cross-functionally with product, clinical, and mobile teams to iterate fast and deliver impact
• Embed security, GDPR compliance, and testing best practices into the core of our stack

Tech Stack

Python • FastAPI • PostgreSQL + PGVector • Redis • Pinecone/Weaviate • Vertex AI • Cloud Run • Docker • Terraform • GitHub Actions • LangChain/LlamaIndex

What We’re Looking For

• 5+ years building production-grade backend systems (preferably in Python)
• Strong background in search, recommender systems, or ML infrastructure at scale
• Experience with RAG architectures, embeddings, and vector search
• Confidence working across GCP (or AWS/Azure) and infrastructure-as-code
• Familiarity with observability, performance tuning, and secure data practices
• A growth mindset, startup grit, and genuine passion for solving healthcare challenges
• UK-based with the right to work and able to be in the office 2–3 days per week

Nice to Have

• Background in healthcare, clinical tech, or MLOps tooling (MLflow, Kubeflow, Vertex Pipelines)

What’s on Offer

Competitive salary + meaningful equity

‍♂️ 25 days holiday + UK bank holidays

Flexible hours and a sustainable work pace

Bright, collaborative office minutes from Euston

If you’re excited about building tools that make a real-world difference and want to shape the early DNA of a healthtech startup backed by serious tech we’d love to connect.