TenThirty

Consumer apps that grow fast need backend systems that can keep up with rapidly increasing usage while a small founding team keeps shipping new product features. TenThirty describes a consumer app that went from $0 to $6M ARR in 11 months, implying the existing backend and team now need to handle scale, reliability, and new feature delivery simultaneously. Without a dedicated engineer taking ownership of core services, the three founders are left splitting time between deciding what to build and ensuring the backend stays reliable as traffic grows.

TenThirty is hiring a Founding Engineer to take ownership of the Python backend services, APIs, and production databases behind one of its consumer apps. The role covers designing APIs and data models, shipping business logic for new features, and improving backend performance and reliability as usage scales, with the option to contribute to the frontend using React and TypeScript when needed. The person works directly with the three founders, has co-founder-level ownership and vesting, and is expected to bring testing discipline and high ownership from day one. The listing also mentions infrastructure on platforms like Railway and experience with LLM prompts as relevant nice-to-haves, suggesting the product incorporates both standard web infrastructure and AI-driven features.