Full Stack Developer

New York, NYHybridFull Time$150,000–$250,000 /yrPosted 1 month agoVisa sponsorship available

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Required skills

LLM
TypeScript
React
Go
API
Shopify
Klaviyo
Meta
Amazon
coding agents

Nice to have

product ergonomics
UX
founder

Role summary

Hazel is seeking a Full Stack Developer to join their small, senior engineering team. This role involves extending Hazel's action layer, enabling writes back into connected systems like Shopify and Klaviyo, and developing full-stack product features using TypeScript/React and Go. You will work on AI agent workflows, LLM integrations, and cross-system integrations. The ideal candidate has production LLM feature experience, has owned an API at scale, and possesses strong TypeScript skills. This is a hybrid role based in NYC with competitive compensation and equity.

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
0.25–0.5% equity
Top-tier health, dental, vision
Hybrid in NYC (ask about our pool table)

How we hire

15-min intro
Founder call
Technical interview
Onsite — meet the team
Offer

Ready to apply?

You'll be redirected to HAZEL's application page.