Lead Fullstack Engineer

Position Overview

• Location Type: Remote
• Employment Type: Full-Time
• Salary: Not specified

Siena is building enterprise empathic AI Agents powered by reasoning-adept LLMs. Siena is the first AI Agent of its kind, designed to integrate with existing systems and interact with customers across multiple channels from a single, unified platform. If you're excited about the intersection of human-to-machine communication and want to be part of a team driving innovation and making a real impact in automating agentic workflows, join us on our mission to revolutionize customer experience through empathetic AI.

About Siena

We’re not about corporate jargon—here’s what truly matters to us:

• Curiosity and creativity: You always seek new knowledge, ask questions, and explore different perspectives to deepen your understanding.
• Customer empathy: You are driven by our customers’ success. You see needs they can’t articulate.
• Resilience: You bounce back from setbacks, adapt to change, and thrive in the face of challenges.
• Ownership and autonomy: When things break, you fix first, explain later.
• Relationships: You create bonds with your colleagues - building trust and sharing success.
• Craft and speed: You balance vision with pragmatism. Your standards pull everyone higher.
• Open and direct: You share and receive feedback. You are open about what’s working and what not.

About the Role

As a Full Stack Engineer at Siena, you’ll own projects end-to-end, developing and optimizing features within our AI-powered customer support automation platform. You’ll work closely with product and engineering teams, shaping our roadmap while building reliable, high-performance systems. This role is for engineers who love solving real-world problems, thrive in fast-moving environments, and take pride in shipping great products.

What You’ll Do

• Design, build, and maintain scalable features across the full stack (frontend, backend, and infrastructure).
• Collaborate closely with Product to break down scope and deliver in iterative, high-impact releases.
• Work on an AI-first product, integrating cutting-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 DevOps mindset.
• Share knowledge and mentor teammates, fostering a strong engineering culture.

Requirements

• 7+ years of software engineering experience in Node.js, React, TypeScript, and Express.
• Solid experience with cloud environments (AWS – Fargate, Lambda, EC2, SQS).
• Strong database skills with PostgreSQL and Redis.
• Familiarity with CI/CD pipelines (CodePipeline, GitHub Actions, or similar).
• Product-focused mindset—you think beyond just code and care about business impact.
• Deep experience in microservices architectures and scalable systems.

Bonus Points

• Experience with Next.js and LLM integrations.
• Infrastructure as Code (CDK, Terraform).
• Python programming skills.
• Event-driven architecture experience.

Application Instructions

• Not specified.