Full Stack Engineer (Warsaw)

THE MISSION America's industrial base runs on systems built in the 1980s. Billions of dollars in critical components (F-35 parts, industrial assemblies, electronics, bolts, and hoses) still move through email threads, excel sheets, and disconnected ERPs. We're replacing that with an AI-native platform that makes defense, aerospace, and industrial supply-chain operations nearly autonomous. Faster quoting. Faster procurement. Full visibility. Real operational intelligence for the companies our nation depends on.   QUICK FACTS - YC W25 company. Top 5% growth in batch - Raised $10M+ on a hyper-growth trajectory. - Backed by Paul Graham, SV Angel, Pear VC, and CRV - Team of 17 Co-live in our Warsaw & SF Hacker Houses - 7 figure ARR transacting ~50M a week through our system THE JOB The Senior Software Engineer will work closely with other engineers on the platform team and customer-facing forward deployed teams to design, build, and maintain robust full systems that integrate with complex legacy environments and support high-value, high-impact supply chain systems. - Backend-leaning fullstack role using Svelt/Typescript/Postgres. - Design, develop, and maintain full-stack application functionality, including: - Frontend UI - Backend services and APIs - AI workflows and validation systems - Database schemas and data models - Organize, keep track of, and deliver multiple projects in parallel WHAT WE’RE LOOKING FOR - Absolute grinder. Interested in co-living (though not required). - Comfortable with ambiguity and rapid change. - Track record of shipping fast. - Experience architecting systems independently - Motivated by taking an unknown problem, sinking your teeth in, and coming up with a plan of attack. - Experience in shipping projects and products. Be ready to show us at least one full-stack project (GitHub repo / web app / Loom demo video). - Proficiency in TypeScript, JavaScript, and at least one frontend library (React, Svelte, Next etc). - Knowledge of SQL databases, preferably Postgres. - Proficiency in writing, optimizing, and troubleshooting complex SQL queries for data extraction, transformation, and integration. - Strong understanding of software engineering best practices, including version control, testing, and documentation - Ability to work effectively in fast-paced, high-accountability environments - Low ego, curiosity, and intellectual honesty - focused on outcomes, not “being right"