Fullstack Software Engineer Porto

Overview

Meet Siena. Siena is the first intelligence layer for customer experience. We are creating an operating system of AI agents that learn, remember, and act across every customer touchpoint—from support conversations to shopping experiences and voice and social media interactions. Siena powers shopping agents, builds persistent customer memory, generates actionable business insights, and creates empathetic interactions that feel human. We are transforming how businesses understand and connect with their customers, turning every interaction into intelligence that improves the next one.

About The Role

As a fullstack engineer at Siena, you’ll own projects
-
- end, developing and optimizing features within our AI-powered customer support automation platform. You’ll work closely with Product to shape the roadmap while building reliable,
- performance systems. Your code will power millions of monthly customer interactions across global brands, where reliability and speed directly impact business outcomes. If you love solving
- world problems, thrive in
- paced environments, and take pride in shipping great products, this role is for you.

What You’ll Do

• Design, build, and maintain scalable features across the full stack (frontend, backend, and infrastructure).
• Collaborate with Product to break down scope into iterative,
  - impact releases.
• Integrate
  - edge LLM capabilities into real enterprise workflows.
• Work on an AI-first product, integrating
  - edge LLM capabilities into enterprise customer support workflows.
• Solve complex engineering challenges, from optimizing API performance to refining microservices architecture.
• Maintain and improve our cloud infrastructure (AWS) with a Dev
  Ops mindset.
• Exercise high agency and ownership—taking initiative, making decisions, and driving ideas to production.

Who You Are

• 3+ years building in Node. js, React, Type
  Script, and Express.
• Strong experience with Postgre
  SQL, Redis, and cloud environments (AWS: Fargate, Lambda, EC2, SQS).
• Familiar with CI/CD (Code
  Pipeline, Git
  Hub Actions, or similar).
• Experience with microservices and scalable systems.
• Product-driven—you care about the impact of what you ship, not just the code.
• AI-first—you are comfortable orchestrating coding agents (Cursor, Claude Code, etc. ).
• Naturally curious and proactive; you don’t wait for instructions, you create momentum.

Bonus points

• Next. js, Python, or
  - driven architectures.
• Infra-as-code (Terraform, CDK).
• Experience integrating with LLMs in production.
• Event-driven architecture experience.

Why Siena?

• Meaningful impact. Your work directly shapes our product and company.
• Globally distributed team at the cutting edge of CX and AI.
• Competitive salary plus potential equity or stock grants.
• Learning budget. If you’re growing, so are we.
• The thrill of building something new where your contributions matter most.
• AI fluency. Make AI your second nature.
• Opportunity to tackle unsolved problems as we redefine customer experience for the future.

Our Values

We value curiosity, customer obsession, ownership, and direct feedback. We aim for high standards while moving quickly, and we build real relationships with teammates to accomplish great work. When things get tough, we adapt and keep pushing forward.

Our Approach to AI

We treat AI as a natural extension of our work. We have built an ecosystem of agents for research, debugging, writing, analysis, and coding. We share knowledge through demos, Slack discussions, and collaborative learning. Siena seeks people who want to break boundaries, create the future, and reshape industries. If that’s you, we welcome your application.

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.