Senior Fullstack Engineer
Siena AI, Argentina +7
About the job
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, global 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 set the bar rather than follow one, keep reading.
The role
You'll own meaningful parts of the platform end to end, taking ambiguous problems and shipping reliable, high-performance systems that real brands depend on daily. You'll work closely with product to shape scope, make real architectural calls in your area, and do your best work without being managed task by task. This is for engineers who want ownership and can carry it.