Founding AI Product Engineer — Equity & LLM Systems

Atarus; Greater London; On-site; GBP 100,000 - 150,000; Full time

Benefits offered by this job

Meaningful equity

Job summary

Atarus is seeking a Founding AI Product Engineer to join an AI-native operating system startup focused on large-scale energy and infrastructure projects. You will own production LLM agents, multi-agent workflows, and human-in-the-loop verification systems, delivering data-heavy frontend workflows from concept to production.

The role combines full-stack engineering with sophisticated LLM systems, offering founding-level ownership and meaningful equity as the company scales with leading VC backing.

Qualifications

• 4+ years of strong software engineering experience with production experience in LLMs, agent architectures and context engineering.
• Comfort across the full stack with strong product instincts.
• Experience building data-heavy frontend products for complex professional workflows.

Responsibilities

• Own production LLM agents and multi-agent workflows.
• Develop human-in-the-loop systems for reviewing and verifying AI outputs.
• Deliver end-to-end features from problem definition to production.

Skills

LLMs production experience

Agent architectures

Context engineering

Full-stack product engineering

Job description

Atarus is seeking a Founding AI Product Engineer to join an AI-native operating system startup focused on large-scale energy and infrastructure projects. You will own production LLM agents, multi-agent workflows, and human-in-the-loop verification systems, delivering data-heavy frontend workflows from concept to production.

The role combines full-stack engineering with sophisticated LLM systems, offering founding-level ownership and meaningful equity as the company scales with leading VC backing.