Agent Harness Engineer — Local & Cloud AI, Equity & PTO

Jobzhr; New York (NY); On-site; USD 150,000 - 350,000; Full time

Benefits offered by this job

Salary + equity

Medical plans

Catered lunch

Flexible PTO

Flexible WFH

SoHo NYC office

Job summary

EngRadar / LM Studio seeks an Agent Harness Software Engineer to build the core agent system behind Bionic, LM Studio’s agent for work and code. You will enable open models to work with codebases, files, tools, and the user’s computer both locally and in the cloud.

You will craft software that handles model reasoning differences, ensures reliability, and achieves optimal agentic performance across linked devices and cloud infrastructure.

Qualifications

• Significant experience building production software involving language models, developer tools, or automation.
• Strong understanding of tool calling, structured model output, context construction, and streaming inference.
• Experience building stateful systems that perform multi-step work and recover cleanly from failures.
• Excellent TypeScript and general software engineering fundamentals.
• Deep interest in open models and a practical understanding of their strengths and limitations.

Responsibilities

• Build and improve the agent harness that powers Bionic.
• Make local and cloud models reliable at using files, search, Git, the shell, web tools, and document tools.
• Integrate new open models and optimize how they perform in the Bionic agent harness.
• Manage conversation history, working context, tool results, interruptions, and recovery.
• Build repeatable evaluations and diagnostics for understanding where and why an agent fails.
• Constrain the model in a smart way so it remains useful.
• Work across Bionic, the LM Studio runtime, and LM Studio cloud to improve the complete system.

Skills

Production software

Language models

Tool calling

Streaming inference

TypeScript

Open models

Tools

Git

Shell

Web tools

Documentation

Job description

EngRadar / LM Studio seeks an Agent Harness Software Engineer to build the core agent system behind Bionic, LM Studio’s agent for work and code. You will enable open models to work with codebases, files, tools, and the user’s computer both locally and in the cloud.

You will craft software that handles model reasoning differences, ensures reliability, and achieves optimal agentic performance across linked devices and cloud infrastructure.