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.

5 blog posts

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.

Mar 3, 2026

Announcing Datasets in Mastra Studio

Define test cases, run experiments, and track response quality for every change you make.

Feb 19, 2026

Introducing 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.

Aug 6, 2025

The Voice Connection: Mastra's Speech-to-Speech Capabilities

We've expanded Mastra Voice with real-time speech-to-speech capabilities for Agents.

Mar 26, 2025

Giving Agents a Voice

Mastra Voice lets developers add speech-to-text and text-to-speech capabilities to AI agents using a straightforward API

Feb 27, 2025