Senior Software Engineer

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.

Bonus Points:

• Startup experience (you thrive in zero-to-one).
• Experience training or deploying ML models in production.

Pulled from the full job description

• Health insurance
• Vision insurance
• Dental insurance
• Unlimited paid time off, * $150K - $210K * Offers Equity, * 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

Compensation Range: $150K - $210K

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.