Yujohn Nattrass
Software Engineer
Yujohn Nattrass is a software engineer at Mastra based in New York. He's a co-creator of Able and holds AWS and Kafka certifications. Previously at Netlify, he was known for quickly picking up complex architectures and consistently performing above his title.
Posts by Yujohn Nattrass
Change, Run, and Compare with Experiments in Mastra Studio
Run test cases against agents and workflows, score the results, and track quality over time.
Yujohn NattrassEvalsFeb 19, 2026Introducing Datasets in Mastra Studio
Define test cases, run experiments, and track response quality for every change you make.
Yujohn NattrassEvalsAug 6, 2025Introducing Scorers in Mastra
We're excited to announce the release of scorers in Mastra, a new way to evaluate and rank the quality of your agent's responses.
Yujohn NattrassEvalsMar 26, 2025The Voice Connection: Mastra's Speech-to-Speech Capabilities
We've expanded Mastra Voice with real-time speech-to-speech capabilities for Agents.
Yujohn NattrassVoice & UIFeb 27, 2025Giving Agents a Voice
Mastra Voice lets developers add speech-to-text and text-to-speech capabilities to AI agents using a straightforward API
Yujohn NattrassVoice & UI