Medical AI training datasets from experienced clinicians

Senior Systems Researcher (Operating Systems and Infrastructure), Expert AI Reviewer (PhD)

Cobalt builds expert data and evaluation infrastructure for AI developers. The company is seeking a senior systems researcher to design challenging operating systems and infrastructure tasks for frontier AI models, evaluate model attempts, and refine tasks to expose genuine capability gaps.

Principal Software Engineer, Expert Code Reviewer for AI Models

Cobalt builds expert data and evaluation infrastructure for AI developers. The company is seeking principal-level software engineers to design challenging command-line software engineering tasks for frontier AI models, develop testing environments and reference solutions, review model-generated code, and refine tasks with reviewers.

Principal Software Engineer, Expert Code Reviewer for AI Models (PhD)

Senior Machine Learning Researcher, Expert AI Reviewer

Cobalt builds expert data and evaluation infrastructure for AI developers. The company is seeking senior machine learning researchers to design rigorous command-line research tasks, evaluate frontier AI model performance, diagnose failures, and refine tasks with reviewers until acceptance.

Senior Machine Learning Researcher, Expert AI Reviewer (PhD)

Principal Security Researcher, AI Model Evaluation

Cobalt builds expert data and evaluation infrastructure for AI developers and is recruiting senior security researchers for a contract project. The role focuses on designing realistic command-line security tasks, building task environments and automated tests, evaluating frontier AI models, and refining tasks based on reviewer feedback.

Principal Security Researcher, AI Model Evaluation (PhD, Contract)

Machine Learning PhD Researcher

Cobalt is seeking PhD-qualified machine learning researchers to partner with a leading frontier AI lab on evaluating frontier models. The contract role involves developing and assessing technical problems and model outputs, synthesizing research evidence, identifying reasoning failures, and contributing expertise to benchmarks, evaluations, and datasets.

Machine Learning PhD Researcher (Contract)

Research Engineer

Cobalt is focused on innovative AI solutions, and they are seeking a Research Engineer to conduct research in post-training optimization and reasoning techniques. The role involves developing algorithms, analyzing datasets, and collaborating with teams to enhance AI models and contribute to R&D projects.

Data Scientist

Cobalt is seeking a Data Scientist to drive analytical insights and data-driven decision-making in the artificial intelligence and institutional finance space. The role will lead the data science organization, develop analytics strategies and frameworks, manage the full analytics lifecycle, and deliver predictive models and actionable intelligence to AI labs and institutional clients.