Applied AI Product Engineer

Closr; New York (NY); On-site; USD 120,000 - 180,000; Full time

Job summary

Closr in the Flatiron District, New York City, is looking for a hands-on Full-stack Engineer to join our in-office team five days a week. You will own meaningful parts of the product from day one and work closely with customers to translate feedback into improvements.

You will build AI testing agents with LLMs and agentic systems, tackle zero-to-one initiatives, and demonstrate high agency by ramping up quickly in a fast-paced startup environment.

Qualifications

• 3 to 8 years of full-stack engineering experience.
• Strong TypeScript, React and Next.js with real backend experience.
• Hands-on work with LLMs or AI agents.
• Ownership of zero-to-one product improvements or equivalent initiative.
• High agency with fast ramp-up in a startup context.

Responsibilities

• Work directly with customers and turn their feedback into product improvements within hours.
• Build and improve AI testing agents using LLMs and agentic systems.

Skills

TypeScript

React

Next.js

Backend

LLMs

AI agents

Startup experience

Tools

DevOps

Job description

About the role

What you'll do

• Work directly with customers and turn their feedback into product improvements within hours
• Build and improve AI testing agents using LLMs and agentic systems

What we’re looking for

• 3 to 8 years of full-stack engineering experience, with strong TypeScript, React and Next.js and real backend experience
• Early-stage startup experience (seed to Series B), or a clear record of zero-to-one ownership elsewhere
• Hands-on work with LLMs or AI agents, at work or in side projects
• A story of owning something zero-to-one, or pushing a product improvement through on your own initiative
• High agency: you can ramp up in under a month with little hand-holding

Nice to have

• Infrastructure or DevOps background

Location and visas

Flatiron District, New York City, in office 5 days a week. Relocation welcome. Visa transfers (OPT, H-1B transfer) are supported. New H-1B sponsorship is not available.

A founder chat, then a live technical session with the CTO (not leetcode-style). After that comes a virtual onsite and a paid one-day work trial.