Senior Software Engineer

About the Role We're a Y Combinator–backed, seed-stage AI startup modernizing procurement and distribution for the defense, aerospace, and industrial sectors. Our small, high-caliber team of ~15 embeds directly into client operations to build AI-native systems that bring order to fragmented, legacy-heavy environments — automating quoting, sourcing, and operational workflows at scale. We're looking for a Senior Software Engineer to join our core platform team. This is a backend-leaning full-stack role where you'll design and ship end-to-end features across frontend UI, backend services and APIs, AI workflows, and database schemas — all in service of high-value supply chain operations. What You'll Do Collaborate with the platform team and forward-deployed customer-facing engineers to design, build, and maintain robust full-stack systems. Integrate with complex legacy environments (ERP, CRM, supplier portals, spreadsheets, shared drives, and more). Build and maintain backend services and RESTful or GraphQL APIs. Develop frontend UIs using Svelte and TypeScript. Design and optimize PostgreSQL schemas and write efficient SQL for data-intensive workflows. Contribute to AI workflows and validation systems that power real-time operational intelligence. Manage and deliver multiple projects in parallel within a collaborative, co-located team environment. Work closely with teammates across SF and Warsaw offices. What We're Looking For Required: Up to 5 years of software development experience (we value depth and demonstrated impact over years alone). Proficiency with Svelte and TypeScript for frontend development. Strong experience with PostgreSQL, including schema design and efficient query writing. Experience designing and implementing backend services and RESTful or GraphQL APIs. Proven ability to integrate with legacy systems and complex technical environments. Experience contributing to AI workflows and/or validation systems. Comfort shipping full-stack features end-to-end in a fast-paced, ambiguous startup environment. A collaborative mindset — this team moves fast and works closely together, both in-person and across time zones. Nice to Have: Experience working in or with distributed, multi-location engineering teams. Domain knowledge in supply chain, logistics, procurement, defense, or aerospace. Compensation & Benefits Salary: $150,000 – $220,000 USD annually, depending on experience. Equity participation in a well-funded, early-stage company. Opportunity to work on genuinely hard technical problems with a high-caliber, mission-driven team. Note: Visa sponsorship is not available for this role. Location This is an on-site role based in San Francisco, CA. Candidates must be willing and able to work from our SF office. Relocation to San Francisco is expected.