Spencer Romo

Senior Data Scientist, AWS

Spencer Romo is a Senior Data Scientist in AWS Forward Deployed Engineering. He maintains Stickler, the open source AWS library for field-level evaluation of structured output, and built the StructuredOutputSimilarity evaluator in Strands Evals on top of it.

1 post

October 20, 2026

Evaluating structured agent output, field by field, with Strands Evals

StructuredOutputSimilarity scores structured agent output field by field with Stickler: deterministic, per-field accuracy with no LLM judge in the default path.

Spencer RomoVincil BishopDiego GalavízHarry CavanaghHayley Park