Research Engineer

Senior/Staff Research Engineer role at Zeno, a legal AI startup. You work on core methodological problems at the intersection of LLM systems, knowledge representation, evaluation, and legal reasoning.

What you do:

• Build and maintain a reusable experimentation framework (reproducible runs, controlled comparisons, fast iteration loops)
• Design rigorous experiments: ablations, baselines, error taxonomies, uncertainty quantification
• Create evaluation datasets and benchmarks where no clean ground truth exists
• Prototype and validate computational models of law that formalize legal concepts, rules, and dependencies
• Write internal research reports that convert ambiguous questions into measurable progress
• Work closely with research scientists, ML engineers, and legal domain experts

This is a research-driven role where you tackle problems where ground truth is incomplete/messy, correctness is critical but hard to define, and progress depends on rigorous experimentation.