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Software Engineer, Platform Experience

Remote, Brazil +8·Full-time·Added 4 months ago (last checked 21 Oct)

Siena AI

5 open roles

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Our summary

Work mode: Remote (Brazil / Remote - LATAM / Argentina / Poland / Finland / Helsinki, Finland / Romania / Remote - Europe / United Kingdom)
Contract: Full-time
English: Required

Visa options

The ad doesn’t mention sponsorship
Not a refusal, but not a yes. Worth asking in your first message.
May fit the digital nomad visa
A remote job for a company outside Spain: you apply yourself, no sponsor needed. It asks for about €2,849 a month in remote income.

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Skills

Requirements

What we're looking for

The Bar: If you're missing any of these, this isn't the role for you.

You solve problems end to end. Given a customer, some logs, and a vague symptom, you find the break and can tell a customer-side cause from a product bug
You're fluent with AI agents and prompts. You've built or debugged LLM workflows and know how they break: prompts, knowledge bases, retrieval, the gap between test and live
You're excited to build automation, not just fix what's in front of you. You think in leverage. This is the signal that matters most
You like talking to customers. You'll get on a call and resolve the real problem live, not just the reported one
Comfortable in our core stack (Node.js, TypeScript, React, Express) or close enough to ramp fast
Fluent with AI coding tools (Claude Code or equivalent) to script, clean data, or navigate a new codebase fast
You own problems nobody assigned you, and you make the people around you better through docs and walkthroughs
You stop at "it's not our bug" instead of finding the real cause
You'd rather build the fix than talk to the customer who hit it
You want a backlog of well-scoped tickets, not ambiguous production fires

Nice to have

Strong Signal: Not dealbreakers, but what separates a good hire from a great one.

Nice to Have: Bonus, not required.

Observability tooling (Grafana, Honeycomb, Sentry)
Internal tooling that turned manual work into a system
Ecommerce or DTC exposure

Pay & benefits

What you'll get

Great salary plus equity or stock grants. Own a piece of what you build.

Learning budget. If you are growing, so are we.

The role

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.

You take the hardest problems customers hit in production and solve them end to end: a webhook that stopped firing, an agent filling the wrong parameter, a report that won't reconcile. You find the real cause, work the customer to resolution, then build the automation so it doesn't come back. This is the front door to deployment and platform work at Siena, with a clear path into Forward Deployed Engineering or deeper platform work.

What you'll do

Own hard problems end to end: trace, reproduce, fix, or hand engineering a clean reproduction. Get on the call when that's the fastest path
Debug the agents and the prompts. Diagnose whether a misfire is prompt, knowledge base, config, or model, then fix it so it holds under real traffic
Build so it doesn't happen twice. For every fix, ship the runbook or tool that stops it recurring
Close the loop to Product. Surface patterns, not one-offs, backed by metrics
Raise the team's floor. Lift what the whole team can resolve, not just what you can
Know where your scope ends. Escalate genuine product bugs and outages with a clean reproduction, not a shrug
Within 90 days, name the top recurring failure patterns and attack them at the root, not just patch symptoms

About Siena AI

Siena AI is a San Francisco-based technology company specializing in customer service automation through empathetic AI agents. The company provides a platform that enables enterprise brands to automate customer interactions across multiple channels, aiming to deliver human-like, context-aware responses. With a focus on innovation, Siena AI has quickly established itself in the AI customer experience space, serving a growing roster of clients and continuously expanding its product capabilities.

In Spain, Siena AI is building a presence by hiring for key roles in engineering, sales, and product management, indicating a strategic investment in the European market. The company's work culture emphasizes innovation, collaboration, and the development of cutting-edge AI solutions. For international professionals, Siena AI offers the opportunity to work with a fast-growing startup, contribute to transformative AI technology, and be part of a diverse, remote-friendly team that values impact and creativity.

Founded: 2022
Employees: 11–50
Headquarters: San Francisco, USA
Website: siena.cx

Good to know if you are moving

Siena AI is a remote-first company, allowing flexibility for international hires to work from Spain.
The company has raised over $30 million in funding, indicating strong financial backing and growth potential.
Siena AI's platform is used by notable brands, providing employees with exposure to high-profile clients.
The Spain-based roles are part of the company's European expansion, offering early-stage growth opportunities.
The company emphasizes a culture of innovation and collaboration, with a focus on AI and customer experience.

In their own words

About the company & 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.

Additional information

Real ownership. 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.

Work that ships and matters. What you build reaches real consumer brands fast.

A category we are creating. The Agent of Record is new ground, with unsolved problems and cutting-edge models, not a crowded field to compete in.

A team that respects your judgment. Globally distributed, async-first, low bureaucracy. We hire adults and treat you like one.

AI-fluency by default. Few places will push your work with production AI further or faster.

The people who thrive here are curious, customer-obsessed, and take ownership without being asked. They fix problems first and explain later. They're direct about feedback - both giving and receiving it - because they care more about getting things right than being polite.

They maintain high standards while moving at startup speed, and they build real relationships with teammates because they know that's how great work gets done. When things get tough, they adapt and keep pushing forward.

The people who thrive here treat AI like a natural extension of themselves. They've built their own ecosystem of agents - some for research, others for debugging, writing, analysis, or writing code. They know which AI works best for what problem.

Everyone gets premium accounts (ChatGPT, Claude, Perplexity Pro, Cursor, Lovable) plus a quarterly budget for new tools. But the magic happens in how we share knowledge. Demo days where someone shows off a clever workflows. Slack threads about which model handles a specific use case better. Learning from each other's AI workflows.

At Siena, we're not just looking for people who can do a job. We're looking for people who want to break boundaries, create the future, and reshape industries. If that's you, we look forward to your application.

We use AI-assisted screening tools as part of our hiring process. All decisions are made by humans. You can request a human-only review at talent@siena.cx.

Siena provides equal employment opportunities to all employees and applicants for employment without regard to race, color, religion, sex, national origin, age, disability, genetics, sexual orientation, gender identity, or gender expression. We are committed to a diverse and inclusive workforce and welcome people from all backgrounds, experiences, perspectives, and abilities.

All open roles at Siena AI