Founding Full-Stack Engineer

Title: Founding Full-Stack Engineer Location: New York City (Union Square) In-person Reporting Structure: Reports directly to the Founding Team Company Description 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 TypeScript / 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 TypeScript / JavaScript 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: TypeScript 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