Senior Software Engineer

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.

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.

• 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.

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

• Experience training or deploying ML models in production.

• 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.

• 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