Meet Siena Siena is the Agent of Record for CX, built for consumer brands like Spanx, FIGS, Brooklinen, and Grüns. It runs as a connected multi-agent stack on top of a shared intelligence layer: agents that sell, support, listen, handle social and voice across the entire customer journey, turning every conversation into signal you can act on.
The team We are a small, fully distributed, general team. If you want to set the bar rather than follow one, keep reading.
The Role Siena runs customer experience for consumer brands through a connected multi-agent stack. You'll own how we measure, test and improve agent performance, and how customers see it. You'll work directly with engineering, deployment and customers, and you'll be expected to build as well as specify.
Build and ship the evaluation, testing and monitoring systems that make agent performance measurably better over time.




Design and run structured experiments and A/B tests across agent workflows.
3+ years as a PM in CX, ecommerce, helpdesk or AI automation.
You've run structured experiments or A/B tests and can say what the data did and didn't tell you.
What you build reaches real consumer brands fast.
We hire adults and treat you like one.
Learning budget. They've built their own ecosystem of agents - some for research, others for debugging, writing, analysis, or writing code. Everyone gets premium accounts (ChatGPT, Claude, Perplexity Pro, Cursor, Lovable) plus a quarterly budget for new tools. Slack threads about which model handles a specific use case better.

📌 Product Manager, Agent Platform (España)
🏢 Sierra Ventures
📍 España