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Senior/Staff Software Engineer at Mainstay

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Mainstay | Senior/Staff Software Engineer (Full-stack) | Remote (US) | Full-time

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.

About the Role

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

Apply

Check out the roles at: https://www.mainstay.com/careers

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