Meet Siena
Siena is the Agent of Record for consumer brands. One agent that owns the entire customer journey, running on a shared intelligence layer no point tool can replicate.
Consumer brands run ten or more disconnected tools to manage their customers. We collapse that stack into a single agent. It started with support, the hardest surface a brand has, and it expands from there: Shopping Agent, Social Agent, Siena working alongside a brand's own operators. One agent across every surface, with shared memory, shared context, and shared tools.
Hundreds of brands already run real customer volume on Siena in production. This is built, working, and growing, and we are racing to build what comes next.

The team
We are a small, fully distributed, general 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 p

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