AI Engineer (Up to £220k + equity)

Oliver Bernard; Paris; Hybride; EUR 222 000 - 257 000; Plein temps

Résumé du poste

Oliver Bernard is seeking a Staff / Principal AI Engineer to lead major areas across model improvement, RL, evaluations and agent infrastructure in a production AI platform. You will own research directions and stay close to models and experiments.

This is a deeply hands-on IC role with technical leadership, collaborating with teams, defining training-data pipelines, evaluation frameworks, and scalable systems. Location London, hybrid—2 days onsite per week.

Qualifications

• Strong hands-on experience training, fine-tuning or post-training ML models.
• Deep understanding of modern ML, RL, evaluation and model optimisation.
• Experience building agentic systems or AI infrastructure.
• Strong software engineering fundamentals and production-quality Python.
• Track record owning technically ambiguous, high-impact projects.
• Staff / Principal-level technical leadership while remaining an IC.

Responsabilités

• Own major AI initiatives from research question through to production.
• Lead work across post-training, fine-tuning, RL and model evaluation.
• Build agent harnesses, sandboxed execution environments and feedback systems.
• Develop training-data, synthetic-data and curation pipelines.
• Design experiments, evaluation frameworks and measurable success criteria.

Connaissances

Hands-on ML training

Fine-tuning models

Post-training ML

RL and evaluation

AI infrastructure

Python production-grade

Technical leadership IC

Ambiguity ownership

Description du poste

Staff / Principal AI Engineer, AI Platform | Up to £220k + Equity | London, Hybrid.

We’re working with a well-funded frontier AI company building the infrastructure used to train and evaluate increasingly capable AI agents.

They create interactive software environments where agents can complete tasks, receive feedback and improve through experience. The platform is already being used in real training and research workflows with leading AI labs.

They’re now scaling the core AI platform and hiring senior ICs to own major areas across model improvement, post-training, RL, evaluations and agent infrastructure.

Role

A deeply hands-on Staff / Principal position with significant technical ownership. You’ll define research and engineering direction while staying close to models, experiments and production systems.

Responsibilities

• Own major AI initiatives from research question through to production
• Lead work across post-training, fine-tuning, RL and model evaluation
• Build agent harnesses, sandboxed execution environments and feedback systems
• Develop training-data, synthetic-data and curation pipelines
• Design experiments, evaluation frameworks and measurable success criteria

Requirements

• Strong hands-on experience training, fine-tuning or post-training ML models
• Deep understanding of modern ML, RL, evaluation and model optimisation
• Experience building agentic systems or AI infrastructure
• Strong software engineering fundamentals and production-quality Python
• Track record owning technically ambiguous, high-impact projects
• Staff / Principal-level technical leadership while remaining an IC

Location

London, typically 2 days per week.

Package

Up to £220,000 base depending on experience, plus meaningful equity.