Principal Fullstack Engineer (Backend, Infra, Agents & Frontend)

America's defense industrial base runs on infrastructure built in the 1980s. SalesPatriot is revolutionizing this space by building AI infrastructure to eliminate manual bottlenecks in critical national security workflows. As a Principal Fullstack Engineer, you'll work at the frontier of full-stack engineering, LLM infrastructure, and human-in-the-loop systems that power national supply chains.

The company is experiencing rapid growth with $1M+ ARR in under 90 days and is backed by prestigious investors including YC, SV Angel, Pear VC, and CRV (Raised 5M Seed at 50M valuation). They're trusted by 1,231+ manufacturers across aerospace and defense.

You'll be building the AI-native command center for U.S. defense logistics, architecting semi-structured data flows, designing human-in-the-loop agentic systems, and creating operational UIs. The role involves building intelligent parsing systems for RFQs, developing AI backtesting frameworks, and creating Excel-style tools powered by chain of thought reasoning.

The work environment is intense and fast-paced, with the team co-living in SF to maximize productivity and collaboration. They work 12-15 hour days driven by passion for the mission. The compensation includes full living expenses (housing and food) in addition to the base salary and equity.

This is an ideal opportunity for someone who:

• Thrives across the full technology stack
• Enjoys high-intensity, fast-paced environments
• Is scrappy and solution-oriented
• Can work independently without detailed specifications
• Is ready to work in-person in San Francisco

The impact is immediate and tangible - you'll see your work changing lives in days, while helping reshape how defense logistics function in the U.S. This is not a role for those seeking a traditional, structured environment, but perfect for those who thrive on adrenaline, learning fast, and building hard things with talented teammates.