The AI job which pays up to £630,000 a year in London

Anthropic, the AI company behind Claude, is offering a Research Engineer role in reinforcement learning with a compensation range of £260,000 to £630,000 per year in its London office.

The salary, which includes bonuses but does not include equity, has drawn widespread attention as evidence of the intensifying global battle for elite AI talent.

The position, titled Research Engineer, Machine Learning (Reinforcement Learning), sits at the intersection of cutting-edge research and high-performance systems engineering.

Successful candidates will work on advancing the capabilities and safety of Anthropic’s Claude models by developing “agentic” AI systems.

Key responsibilities include:

• Architecting and optimising core reinforcement learning infrastructure, including distributed training across large GPU clusters
• Designing novel training environments, evaluations, and methodologies for RL agents capable of open-ended tasks such as computer use and autonomous software generation
• Improving model reasoning abilities, particularly in areas like mathematics
• Driving performance improvements through profiling, optimisation, benchmarking, and building scalable infrastructure
• Collaborating closely with research, alignment, and production training teams

The role requires strong proficiency in Python and async/concurrent programming, experience with machine learning frameworks (PyTorch, TensorFlow, or JAX), and a demonstrated ability to balance exploratory research with robust engineering implementation.

Familiarity with LLM architectures, reinforcement learning techniques, distributed systems, and Kubernetes is highly valued, though Anthropic emphasises that strong candidates need not have formal academic credentials or publications.

A bidding war for talent

AI companies are in the midst of a bidding war when it comes to compensating top talent. Meta, OpenAI, Google DeepMind, and xAI are all competing aggressively for the same small pool of researchers and engineers who can push the boundaries of frontier models.

London has become a key battleground in this talent war, serving as a natural European hub for US AI labs expanding abroad.

While the advertised range is base salary plus bonus, total compensation packages at companies like Anthropic often include significant equity grants, which can push the overall value substantially higher for high-performing hires.

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