Fullstack Engineer

About the Company

Siena is the Agent of Record for consumer brands. We collapse the disconnected tool stack into a single agent that owns the entire customer journey, from support to shopping and social interaction, running on a shared intelligence layer.

Responsibilities

• Own features and systems across the full stack, frontend, backend, and infrastructure
• Partner with product to break down ambiguous scope and ship iterative, high-impact releases
• Make architectural and design decisions and explain the reasoning to the team
• Integrate cutting-edge language models into enterprise customer workflows
• Solve engineering problems related to API performance, microservices, and scaling
• Maintain and improve AWS infrastructure with a DevOps mindset
• Review code and help teammates level up

Requirements

• 5+ years of software engineering experience with production ownership
• Proficiency in Node.js, React, TypeScript, and Express
• Experience with AWS (Fargate, Lambda, EC2, SQS), PostgreSQL, and Redis
• Experience with CI/CD pipelines (CodePipeline, GitHub Actions, or similar)
• Experience with microservices and scalable systems
• Proven experience shipping LLM-powered features to production
• Product-focused mindset with a focus on customer outcomes

Preferred Qualifications

• Experience with Next.js
• Infrastructure as Code (CDK, Terraform)
• Python proficiency
• Experience with event-driven architecture
• Background in customer support or CX software

Benefits

• Competitive salary plus equity or stock grants
• Learning budget
• Access to premium AI tools (ChatGPT, Claude, Perplexity Pro, Cursor, Lovable)