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.

We are a small, fully distributed, general team. If you want to set the bar rather than follow one, keep reading.

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. This is for engineers who want ownership and can carry it.

Own features and systems across the full stack (frontend, backend, infrastructure) from problem definition through production.

Make real architectural and design decisions in your area, and explain the reasoning so the team can build on it.

API performance, microservices, scaling across channels and brands.

Maintain and improve our AWS infrastructure with a DevOps mindset.

5+ years shipping and owning systems that are live in production, not personal projects.

Strong in our core stack: Node.js, React,



TypeScript, Express.

Solid with AWS (Fargate, Lambda, EC2, SQS), PostgreSQL, and Redis.

Comfortable with CI/CD pipelines (CodePipeline, GitHub Actions, or similar).

Next.js.

Infrastructure as Code (CDK, Terraform).

Python.

Background in customer support or CX software.

You need a manager checking in regularly to stay motivated.

You will own problems, not tasks, with the autonomy to solve them your way and the trust to do it without a manager in your inbox.

What you build reaches real consumer brands fast.

We hire adults and treat you like one.

Learning budget. They're direct about feedback - both giving and receiving it - because they care more about getting things right than being polite.

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.

📌 Senior Full stack developer Next.JS/Node.JS (Santiago de Compostela)
🏢 Sierra Ventures
📍 Santiago de Compostela