Senior Software Engineer

Moonshot AI, Inc.; New York, Northern (NY, KY); Hybrid; USD 140,000 - 210,000; Full time

Benefits offered by this job

Competitive compensation

Meaningful equity

Full health coverage

Unlimited PTO

Office in Midtown Manhattan

Work directly with founding team

401k

One Medical membership

Job summary

Moonshot AI, Inc. in New York is seeking a Senior Fullstack Engineer to own and shape the software stack that powers our AI-driven platform. You’ll build, scale, and own systems end-to-end, from backend APIs to dashboards, with autonomy and fast iteration.

You should bring 5+ years of fullstack experience (Python/JS) and a background in CS/EE/Math, plus an enthusiasm for AI and LLMs. The role offers an on-site Midtown Manhattan setting with equity and a strong engineering culture.

Qualifications

• You write clean, scalable code and ship at speed.
• 5+ years of fullstack experience (Python, JS, AWS preferred).
• Experience leading teams or driving major projects.
• Background in CS, EE, Math, or equivalent hands‑on mastery.
• An AI enthusiast who wants to build with LLMs and shape real-world applications.

Responsibilities

• Architect and build scalable systems — backend APIs to frontend dashboards — handling tens of millions of web events per day.
• Design large-scale data infrastructure to explain how websites are built and optimized.
• Train and integrate LLMs into production to hypothesize, generate, and validate variants.
• Shape engineering culture and practices across the stack and processes.
• Experiment, prototype, and iterate across research, product, and AI scale.

Skills

Software craftsman

Fullstack development

Leadership experience

AI enthusiasm

Python

JavaScript

AWS

Education

CS/EE/Math background

Tools

Python

JavaScript

AWS

Job description

Why Moonshot AI?

Imagine websites that rebuild themselves on autopilot to sell more, convert better, and grow faster.
At Moonshot AI, we’re making that happen — merging generative AI, large-scale data pipelines, and experimentation into a self-evolving web.

We’re a well-funded, very early-stage startup with a massive vision. Joining now means you’re not just an employee — you’re helping set the technical and cultural DNA of the company. If you’ve ever wanted the autonomy of a founder with the backing of top-tier investors, this is it.

What You’ll Build & Achieve

As our Senior Fullstack Engineer, you’ll be hands-on across the stack — designing, building, and scaling systems that power our AI-driven platform. Expect autonomy, speed, and a ton of ownership.

• Architect and build scalable systems — from backend APIs to frontend dashboards — that process tens of millions of web events per day.

• Design large-scale data infrastructure that explains how websites are built, why they perform the way they do, and how to optimize them.

• Train and integrate LLMs into production to automatically hypothesize, generate, and validate website variants.

• Shape engineering culture & practices — your fingerprints will be all over our tech stack, architecture, and team processes.

• Experiment, prototype, and iterate — research + product + AI + scale, all at once.

This isn’t about maintaining yet another SaaS app — it’s about building an AI engine that redefines how digital products are created.

Who We’re Looking For

• A software craftsman — you write clean, scalable code and know how to ship at speed.

• 5+ years fullstack experience (Python, JS, AWS preferred, but not a blocker).

• Experience leading teams or driving major projects.

• Background in CS, EE, Math, or equivalent hands‑on mastery.

• An AI enthusiast who wants to build with LLMs and shape how they’re applied in the real world.

Bonus Points:

• Startup experience (you thrive in zero-to‑one).

• Experience training or deploying ML models in production.

At Moonshot, culture isn’t fluff — it’s how we win

• Curiosity & Growth We challenge assumptions, ask big questions, and push for mastery.

• Low Ego No ivory towers — everyone gets their hands dirty.

• Ownership You own outcomes, not just outputs. Shipping is step one; impact is the goal.

• Trust Radical transparency and accountability, even when it’s hard.

• Agility We move fast, test faster, and aren’t afraid to pivot.

• This Is Your Company Ideas fuel breakthroughs. We’re all builders here.

• Enjoy the Ride Startups are a rollercoaster — we create good vibes and celebrate wins together.

What We Offer

• Competitive compensation

• Meaningful equity — real ownership in Moonshot AI’s success.

• Full health coverage (medical, dental, vision) for you + your family.

• Unlimited PTO — we trust you to take the time you need.

• Tax free commuter and parking benefits

• Office-first culture (4 days/week) — Midtown Manhattan, in the middle of it all.

• Work directly with the founding team — your impact is immediate, visible, and career-defining.

• Free One Medical Membership

• 401k