Founding Full-Stack Engineer Job New York City area,New York USA,Software Development

Founding Full-Stack Engineer

Monk is building a Multi-Agent Revenue OS for modern finance teams. They are an early-stage startup building AI-native software to help companies better understand, manage, and accelerate revenue through automation, integrations, and intelligent workflows. Monk is still in the earliest chapter of the company, but they have already built meaningful momentum. They have a live product, paying customers, and early enterprise demand, and they are now hiring a small number of exceptional engineers to help shape both the product and the company from the ground up.

This is a rare opportunity to join a high-conviction team at the true beginning and build alongside founders operating with real speed, ambition, and intensity.

Quick facts:

Oversubscribed Seed-stage startup
Based in Union Square, NYC
Building a Multi-Agent Revenue OS for finance teams
Live product with paying customers
First Figma and first line of code began in Q1 2025
Hiring 2–4 early / founding engineers
In-person team with high ownership and fast execution
Clients are seeing >40% avg. reduction in AR
Top 1% compensation and meaningful equity

Responsibilities

Build and ship product features across the full stack
Own major pieces of the product and technical architecture from day one
Design and implement customer-facing workflows and integrations
Rapidly prototype, test, and deploy AI-native product experiences
Work closely with the founding team to translate customer needs into product decisions
Help define engineering standards, technical direction, and internal development practices
Contribute to a fast-moving, highly collaborative in-person engineering environment

Is This You?

You may be a strong fit for this role if you are either:

An experienced full-stack engineer
4+ years of experience building production software
Strong full-stack experience, ideally in Type Script / JavaScript environments
Experience working at a fast-growing startup or technically rigorous product company
Comfortable owning projects from 0 to 1
Excited by speed, ambiguity, and a high-accountability environment

Or a more junior engineer with exceptional slope

Around 1+ year of production engineering experience
Strong early evidence of technical ability, initiative, or obsession
Experience building in Type Script / Java Script
Someone who has already built meaningful things outside of school or work
Highly motivated, fast-learning, and eager to earn trust quickly

Across both profiles, the team is especially drawn to people with:

High agency
Extreme ownership
Strong product instincts
Comfort moving quickly and figuring things out
A desire to build in person in NYC

Preferred Qualifications

Strong experience with:
Type Script
Next.js
Full-stack web application development
Experience at a venture-backed startup or other high-velocity product environment
Experience building customer-facing software from 0 to 1
Prior experience as a:
Founding Engineer
Early startup engineer
Founder or technical co-founder
Experience in fintech, accounting, revenue tooling, or related workflow-heavy domains is a plus
Familiarity with modern AI tooling, LLM workflows, or applied product experimentation is a plus

#Perks

Meaningful equity
Opportunity to join at the ground floor
High-talent-density team
Significant product and technical ownership
Fast interview process with clear communication
Cash Compensation ranges from $140 - 170k (more junior profile) through $171 - 250k for the more senior profile