Founding Full Stack Engineer (£80K + Equity) at Klaris

Jack & Jill; Greater London; On-site; GBP 90,000 - 130,000; Full time

Job summary

An innovative AI startup in London seeks a Founding Full Stack Engineer to architect a platform for automating MedTech compliance. You'll transition the product from prototype to scaled production, collaborating with a CTO on AI integration and managing a tech stack including TypeScript, Node.js, and PostgreSQL. Ideal candidates will have 4+ years of experience and a strong startup mentality, thriving in ambiguity while making significant architectural decisions. This role offers substantial equity and high-growth potential in a mission-driven environment.

Qualifications

• 4+ years of professional experience with TypeScript/React/Node.js stack.
• Ability to design and implement successful standalone products.
• Experience with modern DevOps practices including containerization.

Responsibilities

• Architect and build critical components using Node.js, Next.js, TypeScript, and PostgreSQL.
• Collaborate with the CTO to integrate AI models into a production-ready platform.
• Lead development of user interfaces from Figma designs.

Skills

TypeScript

React

Node.js

AWS/GCP

Docker

Kubernetes

Job description

Job Title: Founding Full Stack Engineer

Company Description: Klaris - Pre‑seed AI startup backed by an NHS‑affiliated VC and Antler

Job Description:

Join as the first engineering hire to architect an AI platform automating complex MedTech regulatory compliance. You will transition the product from prototype to a scalable production system, working directly with a CTO (PhD in Multi‑Agent Systems) to help medical device companies navigate audits and reach patients faster through intelligent documentation automation.

Location: London, UK

Why this role is remarkable:

• Founding‑level impact with significant equity and the autonomy to establish the technical foundations, engineering standards, and hiring culture of a mission‑driven startup.
• Work on a non‑wrapper AI product using proprietary datasets to solve a massive, high‑stakes problem in a regulated industry with clear market pull and pilot traction.
• High‑growth environment backed by strategic investors including an NHS‑affiliated VC, Antler UK, and Vento Ventures, offering a direct path to shaping a generational MedTech company.

What you will do:

• Architect and build critical end‑to‑end components across the entire stack using Node.js, Next.js, TypeScript, and PostgreSQL while managing cloud infrastructure on AWS/GCP.
• Collaborate directly with the CTO to integrate custom AI models and LLM endpoints into a secure, production‑ready platform that identifies regulatory gaps and remediations.
• Lead the development of intuitive user interfaces from Figma designs, ensuring high performance, responsiveness, and seamless state management for complex medical documentation workflows.

The ideal candidate:

• 4+ years of professional experience with the TypeScript/React/Node.js stack, demonstrating the ability to design and implement successful, standalone products or high‑scale features.
• Proven "0-to-1" startup DNA with the high agency required to thrive in ambiguity, making independent architectural decisions without needing existing structure or oversight.
• Technical expertise in modern DevOps practices, including containerization (Docker/Kubernetes), CI/CD pipeline management, and secure database schema design for sensitive regulated data.