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Systems Engineer - AI Agent Harness & Evaluation

Job in Phoenix, Maricopa County, Arizona, 85003, USA
Listing for: United States Digital Space LLC
Full Time position
Listed on 2026-08-07
Job specializations:
  • Software Development
    AI Reliability/ Performance Engineer
Salary/Wage Range or Industry Benchmark: 140000 - 210000 USD Yearly USD 140000.00 210000.00 YEAR
Job Description & How to Apply Below

Lexsi Labs is seeking engineers to build the shared layer and evaluation system for autonomous AI agents. You will join teams across the harness, evals, and toolchain, focusing on planning, execution, observation, recovery, and stop conditions.

Your work enables reproducible, measurable improvements in agent behavior across production-like environments. You will work with Python, distributed systems, and containerized sandboxes, contributing to evaluation pipelines, traceability, and tooling

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