Founding Engineer - Agentic AI

Job description

Do you want to be a founding engineer building production AI agents that handle real customer conversations?

Have you ever owned a system end-to-end, from backend design to live deployment?

Are you ready to help scale an AI product already live with real users in healthcare?

A high-growth, pre-seed AI startup in healthcare is hiring a Founding Senior Software AI Engineer to help scale its AI platform. The product is already live in sites across the UK.

This is a true founding-level role: you’ll work directly with the founding team, own major systems end-to-end alongside the CTO, and help define how AI agents are designed, deployed, and iterated in production.

Role summary

You’ll be a senior, hands-on engineer responsible for building scalable backend systems and deploying applied AI capabilities (LLMs, agentic workflows, voice + messaging). You’ll operate with high autonomy and strong product ownership.

Key responsibilities

• Build and scale backend services in Python (AWS)
• Own production integrations (telephony/voice, WhatsApp, email)
• Develop and improve LLM agent workflows (frameworks a plus)
• Implement reliability, monitoring, evaluation and QA practices
• Work end-to-end: scoping, delivery, deployment and iteration
• Collaborate directly with founders on product and technical direction

Requirements

• 3-5+ years software engineering experience in industry (Python)
• Strong AWS experience (production systems)
• Real exposure to AI/LLM systems in industry (not purely academic)
• Independent, proactive, high ownership mindset
• Strong communication and stakeholder skills
• Computer science degree preferred

Nice to have

• Experience with LangGraph / agent frameworks
• Twilio / voice systems / communications tooling
• WhatsApp / messaging platform integrations
• Start-up experience or strong side projects showing “spikes”

Key details

• Title: Founding Senior Software Engineer
• Salary: up to £120,000 + equity
• Location: Central London
• Working model: On-site 5 days/week
• Tech: Python, AWS, TypeScript/React, LLM frameworks
• Visa sponsorship: Not available

Interested? Please apply below.

Extra information

Status

Open

Education Level

Secondary School

Location

London Area

Type of Contract

Full-time jobs

Published at

03-02-2026

Full UK/EU driving license preferred

No

Car Preferred

No

Must be eligible to work in the EU

No

Cover Letter Required

No

Languages

English