Founding Engineer

<h3>Job Description</h3><div><p><strong>About Closai</strong></p>\n<p>Closai is building the consumer purchase infrastructure for the future of commerce. We offer the first SKU-level, cross-brand data layer that's user-permissioned and portable anywhere. The product is two-sided: for consumers, it's a secure layer connecting their purchase history to their favorite agent, app or retailer. For enterprise, it's the infrastructure layer they plug into to see verified, cross-brand purchase signal and the intelligence they rely on to deliver individualized shopping experiences at scale. We operate at the intersection of AI, data infrastructure, and commerce.</p>\n<p><strong> </strong></p>\n<p><strong>About the Role</strong></p>\n<p>We’re looking for a Founding Engineer to own Closai’s technical architecture end-to-end and help define the standard for purchase history intelligence. This is a hands-on role. You'll architect, code, and ship the systems enterprise partners depend on, alongside the founder and CEO, while shaping the company's long-term technical vision.</p>\n<p><strong> </strong></p>\n<p><strong>What You’ll Own:</strong></p>\n<ul>\n <li>Core backend architecture (APIs, data models, security)</li>\n <li>Purchase history intelligence pipelines (ingestion, normalization, enrichment)</li>\n <li>Enterprise integrations (Shopify app, universal retail/API/MCP connectors) built for fast, trustworthy onboarding</li>\n <li>Scalability, reliability and data privacy (performance, uptime, and permissioning)</li>\n <li>Technical roadmap aligned with enterprise SaaS and platform monetization</li>\n <li>Building an AI-native engineering and business culture from the ground up</li>\n</ul>\n<p><strong> </strong></p>\n<p><strong>Technical Skills:</strong></p>\n<p>Backend &amp; Infrastructure:</p>\n<ul>\n <li>Python (preferred) or Node.js, REST and/or GraphQL APIs, PostgreSQL or similar relational databases</li>\n <li>Cloud infrastructure (AWS or GCP)</li>\n <li>Authentication &amp; authorization (OAuth, JWT, scoped access)</li>\n <li>E-commerce platform integrations (Shopify preferred) and building third-party app integrations</li>\n <li>Designing for horizontal scale (caching, queuing, rate limiting, multi-tenant data isolation)</li>\n</ul>\n<p>Data &amp; AI</p>\n<ul>\n <li>ETL and data pipeline design for messy, real-world data</li>\n <li>Embeddings, vector databases and semantic search</li>\n <li>Working with LLMs or ML systems in production</li>\n <li>Enterprise-ready pipelines and APIs built to meet enterprise reliability, SLA, and security-review expectations</li>\n</ul>\n<p>Product Engineering</p>\n<ul>\n <li>Shipping consumer- and enterprise-facing products end-to-end</li>\n <li>Strong intuition for user experience (UX) and developer experience (DX)</li>\n</ul>\n<p><br /></p>\n<p><strong>Compensation: </strong>Base salary, meaningful equity + long-term upside</p></div>