Senior Software Engineer

Hazel; New York (NY); Hybrid; USD 150,000 - 250,000; Full time

Benefits offered by this job

Base salary $150–$250K

Equity 0.15–0.5%

Health, dental, vision

Hybrid in NYC

Job summary

Hazel is building an AI coworker for consumer brands. We connect to live data sources like Shopify, Klaviyo, Amazon, and Meta, turning data into actionable insights for operators.

You will extend the action layer and push changes back into connected systems, enabling product bundles, A/B tests, and safe human-in-the-loop workflows. We seek someone who has shipped production LLM features, owns scalable APIs, and has strong TypeScript experience.

Qualifications

• Shipped a production LLM feature to real users.
• Owned an API at scale: query optimization and schema design.

Responsibilities

• Extend Hazel's action layer; write back into connected systems.
• Build product features across TypeScript/React and Go services.
• Develop AI agent workflows: streaming LLM responses and multi-step tool use.
• Create integrations reading and writing across Shopify, Klaviyo, Meta, Amazon, and more.

Skills

LLM features

API design

TypeScript

UX

Tools

TypeScript

React

Go

Job description

About Hazel

Hazel is the AI coworker for consumer brands. We connect to a brand's live data — Shopify, Klaviyo, Amazon, Meta, and dozens of others — and turn it into a teammate operators talk to every day. Ask "why did repeat purchase rate drop last week?" and 10 seconds later you get an answer, cited from live data.

Hazel also takes action herself, proactively flagging issues and making changes directly in Shopify and the other systems she connects to, on the way to running full playbooks autonomously.

We've raised more than $2M, are rapidly scaling, and serve some of the biggest consumer brands including Bogg Bag, Ultra, and OneSkin. You'll join a small, senior engineering team working directly with the founders.

What you'll work on

In your first 60 days, you'll be extending Hazel's action layer — the writes back into the systems she connects to. Think: creating product bundles in Shopify, launching A/B tests in Klaviyo, and the human-in-the-loop scaffolding that makes all of it safe.

Beyond that:

• Full-stack product features across TypeScript/React + Go services

• AI agent workflows: streaming LLM responses, multi-step tool use, approvals

• Integrations across Shopify, Klaviyo, Meta, Amazon, and more, both reading and writing

You'll work directly with the founders and customers. Code you ship today is in front of operators tomorrow.

Who we're looking for

• You've shipped a production LLM feature to real users.

• You've owned an API at scale: query optimization, schema design, picking the right tool for the workload.

• Strong TypeScript experience

• You use coding agents to do the work of a much larger team, and you can tell us where they helped and where they made things worse.

• You care deeply about how the product ergonomics and UX.

• Former or aspiring founders

This isn't for you if…

• You want product specs handed to you. Your manager is the customer.

• You're low agency

• You aren't excited about

Comp & benefits

• $150–250K base

• 0.15–0.5% equity

• Top-tier health, dental, vision

• Hybrid in NYC (ask about our pool table)