Senior Product Engineer, React Native + Backend

About BaseBase is a platform for in-real-life social connection and community. Our Members are accomplished people who have built careers, families, and reputations. They come to Base for what their calendars are missing: regular, in-person time with peers they actually want to know. The gathering is the product. The systems that make it possible are what this role exists to protect.EngagementContract: 2 to 4 week paid audit, with the option to extend into implementation.About the Role We are looking for a senior, hands-on engineer to audit and stabilize a consumer mobile product and its internal admin tool, HomeBase. The current system spans React Native, TypeScript, backend APIs, database-driven booking and payment workflows, notifications, and Metabase reporting. This is not a greenfield build. We need someone who can quickly understand an existing codebase, identify architectural and execution risks, separate real problems from noise, and produce a practical recovery plan.What You'll DoAudit the React Native and TypeScript mobile app and the related HomeBase admin flowsReview backend and API structure, database models, and the business logic around bookings, guests, cancellations, refunds, credits, and notificationsIdentify technical debt, broken workflows, security risks, stale code, and missing testsReview Linear and project artifacts, and compare planned work against actual implementationProduce a prioritized technical recovery planShip or supervise one small but meaningful stabilization fix during the engagementRecommend the exact team needed to continue: mobile, backend, data, QA, design, or fractional CTOMust HaveSenior or staff-level experience with React Native and TypeScriptStrong backend experience with APIs and relational databasesExperience with payments, refunds, booking systems, marketplaces, memberships, or operational and admin toolingThe ability to read messy code and make judgment calls quicklyStrong written communication: you can explain risks