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Mastra VERIFIED EMPLOYER

AI Engineer.

Remote AI & Research Full-Time

AI Engineer: our view in 3 lines...

  • The Role:This role is for an AI engineer building tools that help developers understand, evaluate, and improve agent behaviour in an open-source TypeScript framework.
  • The Person:The person will build trace-intelligence and agent-evaluation features, run experiments on Mastra’s primitives, and use the results to improve configuration, behaviour, and developer-facing capabilities.
  • Requirements:The ideal candidate has shipped agents and agentic applications into production and has tuned them to improve accuracy, with benchmarking against existing datasets or intelligently creating them.

About the role

We’re looking for an AI engineer. You’ll work on features that help developers understand their agents’ behavior, evaluate their performance, and improve them over time.

This is a hands-on engineering role. You’ll move between experiments, benchmarks, and product code, taking what you learn from evaluating agents and using it to shape the framework.

Why:

  • We’re starting to build more and more agentic features into Mastra: Trace intelligence, and we’re working on various Agent Learning features to automatically self-improve agents (Autoevals + Suggestions, Rollouts).

  • In addition, we’ve been increasingly running Mastra primitives like memory on industry-standard benchmarks and using the results to fine-tune configuration.

What you’ll do

Build the features that make this possible: tools for understanding traces, evaluating agent behavior, and turning results into improvements.

Run experiments on Mastra’s primitives, investigate where they perform well and where they fall short, and use those findings to improve their configuration and behavior. You’ll help turn that work into capabilities developers can use in their own applications.

You have:

  • Shipped agents and agentic applications into production

  • Tuned and tweaked them to improve accuracy

  • You need to be able to benchmark your results against existing datasets, or intelligently creating.

About Mastra

Mastra is the open-source TypeScript framework for building AI agents. Built by the team behind Gatsby, backed by Y Combinator and Spark Capital, with $35M raised total. We went from 0 to 27k+ stars and 1M+ weekly npm downloads in under 18 months.

Small team, shipping fast, fully remote. Most of us work across North American and European time zones.

Published October 7, 2026
Location United Kingdom
Category AI & Research  
Job Type Full-Time