Meet Siena
Siena is the 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, integral team. We have built leverage into how we work, which is what lets a team this size move at the speed we do.
We hire athletes. Everyone here owns real outcomes, defaults to writing over meetings, communicates with directness, and acts the moment they see something worth acting on. Low ego, high standards, fast clock.
If you want to own real problems rather than close tickets, keep reading.
About the Role
This is a Staff-level role for an engineer who operates beyond their own projects. You will decide how core parts of the platform get built, raise the bar for the whole engineering team, and own the hardest technical problems we have.




You will work across the full stack and the full lifecycle: setting architecture, making the cross-cutting calls, and making the engineers around you measurably better. You will partner directly with product and leadership to shape what we build and how we build it.
High autonomy, high trust, high consequence. It is built for someone who wants exactly that.

What You'll Do
- Set technical direction and architecture for major areas of the platform, and bring the rest of engineering with you.
- Own our hardest problems end to end: the ambiguous, cross-cutting, high-stakes work where the right path is not obvious yet.
- Make the build/buy and architectural calls that shape the platform for years, and write down the reasoning so others can build on it.
- Take cutting-edge language models into production inside enterprise customer workflows, where reliability and safety actually matter.
- Multiply the team. Raise the engineering bar through design

📌 Staff Software Engineer (Argentina)
🏢 Siena AI
📍 Argentina