Senior Product Engineer, React Native + Backend

About Base
Base 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.

Engagement
Contract: 4 to 6 week paid audit, with the option to extend into implementation.

About the Role
We're looking for a senior, hands-on engineer to audit and stabilize a consumer mobile product and its internal admin tool, HomeBase. This is a 4-week paid trial: come in, understand the system fast, separate the real problems from the noise, and ship. It's a stabilization engagement, not a net-new feature role. The long-term build-and-own seat is a separate Tech Lead position.

The system spans a React Native + Expo mobile app, a TypeScript monorepo, two backend APIs on AWS (a member-facing API and an admin/back-office API) that run the Stripe payment, subscription, and refund integrations, a Supabase Postgres database with hundreds of migrations, an automation and data-integration layer (n8n-style workflows plus reverse-ETL into downstream tools), and Metabase reporting. Parts of it are mid-migration and lightly tested.

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 ship fixes that hold.

What You'll Do

- Audit the React Native + Expo mobile app and the HomeBase admin flows.

- Review the backend and API structure, the Postgres data models, and the business logic around bookings, guests, cancellations, refunds, credits, and notifications.

- Trace the payment path (Stripe) and the automation / data-integration layer (n8n-style workflows and reverse-ETL) for fragility and silent-failure points.

- Identify technical debt, broken workf...