Virio
Harness Engineer
$150K–$250K
San Francisco · On-site · Full-time · Posted Aug 13, 2026
About the job
Own Virio’s AI harness layer, building prompts, tools, context management, and evaluations that improve the reliability and quality of production agents for B2B content creation.
What you'll do
- Build and refine system prompts, tool integrations, and context windows; design evaluation frameworks and quality metrics.
- Architect the product-to-model abstraction layer and own prompt versioning, experimentation, A/B testing, and iteration.
- Work with product and engineering to identify agent failures and user friction, then improve prompts and architecture.
Nice to have
- Background in English, literature, creative writing, or humanities.
Pay
$150K-$250K USD base salary
Tools
LLM-as-judge evals
AI focus
Build and improve AI agents for writing through prompt and harness design, evaluation, feedback loops, and production reliability.
Model-written summary · the original posting is authoritative