Senior/Staff Software Engineer (Full-stack)

Mainstay is a market intelligence platform for large real-estate operators. We’re an AI-native company focused on turning complex, messy, real-world data into systems customers actually trust to make financial decisions. Mainstay was incubated at Opendoor, spun out in 2024, and recently raised a Series A led by Khosla Ventures. We’re hiring a Senior/Staff Software Engineers, but we care more about ownership and judgment than title. You'll work on: - Designing and evolving foundational data models used across the platform - Building backend services, workflows, and automation systems end-to-end - Applying AI/LLMs pragmatically (automation, reasoning over messy inputs, decision support) - Shipping user-facing product features tied directly to real customer workflows - Owning problems from idea → production → iteration Stack: Python, TypeScript, React, AWS Check out the roles at: https://www.mainstay.io/careers (https://www.mainstay.io/careers)