Full Stack Engineer (Warsaw)

America’s defense industrial base runs on infrastructure built in the 1980s. Distributors and manufacturers managing our supply chain still manually stitch together email threads, supplier quotes, PDFs, government solicitations, and archaic ERP exports to manage billions of dollars passing through our supply chain in component level assemblies.

SalesPatriot changes that.

We're building the AI-native command center for U.S. defense logistics, eliminating the manual bottlenecks slowing down critical national security workflows. From F-35 bearings to Blackhawk rotor hubs, we’re helping distributors and manufactures quote faster, win more, and deliver the parts that keep NATO safe.

Quick Facts

• YC W25 company. Top 5% growth in batch
• Raised $6M+ seed, on a hyper-growth trajectory
• Backed by YC, SV Angel, Pear VC, and CRV
• We work 12–15 hour days because we’re obsessed with the mission

If you don’t know TypeScript and at least one JS-based frontend framework, don’t apply.

SalesPatriot is seeking a Full Stack Engineer to join its core platform engineering team. This role will contribute directly to the development, scalability, and reliability of SalesPatriot’s mission-critical software platform supporting defense and supply-chain operations.

The Full Stack Engineer will work closely with engineering leadership, founders, and customer-facing deployment teams to design, build, and maintain robust systems that integrate with complex legacy environments and support high-value, high-impact workflows. Your code will be the backbone of the defense and supply chain infrastructure for the decades to come. From integrating with ancient government interfaces to architecting hyper-dynamic workflows - no two days will be the same.

Key Responsibilities

• Design, develop, and maintain full-stack application functionality, including:
• Contribute to the core platform code, building frontend components, backend functionality, and database architecture
• Implement integrations with external systems, including legacy government and enterprise platforms
• Collaborate with forward-deployed deployment teams to translate customer requirements into production-ready features which drive millions of dollars in revenue for our clients
• Ensure code quality through adherence to best practices, testing, documentation, and code reviews
• Support onboarding and technical mentorship of new engineering team members
• Manage timelines - if you say that a massive ERP ingestor will be built out in two weeks, millions of dollars will be on the line based on your timely delivery
• Train and onboard new team members
• Trial by fire: you will be onboarded during an on-site implementation. Expect late nights and pressure from the customer - everyone, including the platform team, needs to experience the forward deployed hell.

• You ship code that is useful, maintainable, and clean.
• You communicate clearly with the founders, Deployment Strategists and Senior Software Engineers. That means:
• You set the standard for yourself and others for customer-centric engineering excellence. That means:

• Experience in shipping projects and products. Be ready to show us at least one full-stack project (GitHub repo / web app / Loom demo video), or don’t contact us at all.
• Proficiency in TypeScript, JavaScript, and at least one frontend library (React, Svelte, Next etc)
• Knowledge of SQL databases, preferably Postgres
• 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 - let’s face it: you’ll be constantly torn between the pursuit of engineering excellence and the urgency of deadlines . The only way this works is if you focus on outcomes, not “being right"

• Experience working on enterprise, government, or regulated-industry software
• Familiarity with complex integrations, data ingestion pipelines, or ERP systems
• Strong problem-solving skills and attention to detail
• Professional maturity, intellectual honesty, and a collaborative working style

• Founding Experience: Help define the culture, roadmap, and the team from the ground up.
• Real Equity: You’ll own a meaningful slice of a rocket ship.
• Direct National Impact: Your work will influence how defense logistics function in the U.S.
• Immediate Feedback Loop: No waiting around - you’ll see your work change lives in days.
• No B-Team: You’ll work with brilliant, gritty teammates who push hard and play to win.