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Job opening

AI Harness Engineer

Full-time · remote · Posted 30 Sept 2026

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The roleMore jobsSimilar
01

What you will do

About this role

The role focuses on building systems and integrations that connect people with powerful local AI capabilities. You work at the intersection of AI tooling, agent infrastructure and peer-to-peer technology, and help create scalable experiences for the next generation of AI assistants.

Responsibilities

  • Build and ship new features and fix bugs, with a strong focus on reliability, performance and user satisfaction.
  • Design and develop reusable tools, modules and integrations that enable new AI capabilities across different model types and sizes.
  • Build and maintain AI agent harnesses, including tool calling, agent loops, context management and structured outputs.
  • Develop evaluation frameworks and test infrastructure for AI systems with non-deterministic behaviour.
  • Implement and further develop peer-to-peer technology to support local AI and distributed use cases.
  • Maintain a high-quality codebase through consistent coding standards, code reviews, modular architecture and automated testing.
  • Design systems that handle errors such as network partitions, model errors, timeouts and retries reliably.
  • Develop and maintain reusable npm modules and shared software components.
  • Experiment with new technologies and approaches to continuously expand AI and P2P capabilities.
  • Collaborate effectively with a globally distributed engineering team and communicate technical ideas clearly.

Requirements

  • 5+ years of experience building and maintaining production software.
  • Strong command of JavaScript and TypeScript, including experience modelling complex state across synchronization protocols, agent loops or similar systems.
  • Strong ability to write modular, maintainable and reusable code.
  • Hands-on experience building AI agent harnesses, including tool calling, context management, agent loops and structured outputs.
  • Experience developing evaluation systems and test infrastructure for non-deterministic AI or other complex systems.
  • Experience creating and managing reusable npm modules.
  • Strong testing and debugging skills, with a focus on reliability and production quality.
  • Strong understanding of and practical experience with developing and using AI tools.
  • Deep interest in or professional experience with peer-to-peer technologies, networking or

Skills & experience

SeniorJavaScriptTypeScriptAI agent harnessestool callingcontext managementagent loopsstructured outputsevaluation systemstest infrastructurenpm modulespeer-to-peernetworkingdistributed systemstestingdebugging
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