Callosum in London seeks a research engineer to advance agentic evaluation for AI systems. You will design benchmarks, develop evaluation suites, and turn traces into actionable evidence, measuring what models can actually do across multi-step tasks and tool use.
You will also quantify uncertainty, reduce reliance on single scores, and help shape product decisions with rigorous, reproducible results. Ideal candidates have hands-on experience with LLMs in agentic settings, strong statistical
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