Yujohn Nattrass
Software Engineer at Mastra
Bellevue, Washington, United States
Summary
🤩
Rockstar🎓
Top SchoolYujohn Nattrass is a software engineer with seven years of experience building cloud-native, edge-first applications and developer tooling. He co-created Able, an open-source A/B testing framework for Jamstack sites, and has a proven track record designing scalable AWS and Cloudflare-based infrastructures. At Netlify he drove large migrations (moving 11TB off Firebase to S3) and later contributed backend and DevOps work for Mastra, adding voice APIs and hardening telemetry for a TypeScript AI agent framework. Comfortable across Ruby, JavaScript/TypeScript, Go, Docker, AWS, and Cloudflare Workers, he blends pragmatic infrastructure automation with hands-on backend coding. Based in Bellevue with roots in Queens, he pairs operational rigor with open-source sensibilities and a knack for shipping production-ready systems that cut cost and complexity.
7 years of coding experience
6 years of employment as a software developer
Associate's degree Law Enforcement, Associate's degree Law Enforcement at Justice Institute of British ColumbiaSoftware Engineering, Software Engineering at Launch School
Github Skills (12)
typescript10
nodejs10
typescripts10
hono10
cicd10
typescript-types10
apidoc9
telemetry9
api9
vercel8
ai7
agent7
Programming languages (8)
Github contributions (5)
mastra-ai/mastra
Oct 2024 - Mar 2025
The TypeScript AI agent framework. ⚡ Assistants, RAG, observability. Supports any LLM: GPT-4, Claude, Gemini, Llama.
Role in this project:
Back-end & DevOps Engineer
Back-end & DevOps EngineerContributions:42 reviews, 71 PRs, 141 pushes in 5 months
Contributions summary:Yujohn primarily focused on back-end infrastructure and deployment configurations within the Mastra project. Their work involved setting a request payload limit to align with Vercel function limitations. The user also addressed a bug within the telemetry system by making the trace name configurable to fix langfuse exporter issues. Furthermore, the user was instrumental in adding voice-related API endpoints to the Hono server, which facilitated the integration of speech-to-text and text-to-speech capabilities.
agentsaichatbotsevalsjavascript
YujohnNattrass/Ebean
Jun 2019 - May 2023
Contributions:1 PR, 74 pushes, 1 branch in 4 years
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