Fullstack Engineer

Siena; United States; Remote; USD 140,000 - 190,000; Full time

Benefits offered by this job

Equity or stock grants

Learning budget

Premium AI tools access

Job summary

Siena is seeking an experienced software engineer to own features across frontend, backend, and infrastructure, collaborating with product to ship high-impact releases. You will drive architectural decisions, integrate LLM-powered capabilities, and optimize API performance in a scalable, microservices-driven environment.

The role emphasizes DevOps practices on AWS, reviewing code, and mentoring teammates, with equity and growth opportunities in a fast-moving CX technology space.

Qualifications

• 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).
• Proven experience shipping LLM-powered features to production.

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.

Skills

Node.js

React

TypeScript

Express

AWS

PostgreSQL

Redis

CI/CD

Microservices

LLM integration

Tools

Next.js

Terraform

CDK

Python

Job description

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)