About Mainstay

Mainstay is the leading market intelligence platform purpose built for buying, managing, and selling homes in the single family rental industry. As an AI native company, we turn complex data into clarity that helps the industry move forward with confidence. Founded within Opendoor, Mainstay launched as an independent company in 2024 and recently raised a Series A round led by Khosla Ventures.

About the role

What you should expect as a full-stack senior software engineer: maximum agency, tight feedback loops with customers, and no shortage of product challenges that directly translate to business value! You’ll have the opportunity to design, build, and ship complex systems and tools that enable teams to execute at scale.

We're looking for someone who can build robust, reliable, and production-ready features end to end, from backend systems and retrieval pipelines to user-facing product experiences. Our products are built with Python, TypeScript, and React on AWS.

What you'll do

In this role, you'll shape solutions from the ground up - owning backend and frontend design, automating complex workflows, and directly applying user feedback. You'll help set technical direction for the team, mentor other engineers, and turn big ideas into products that create real impact for our customers and the business.

In this role, you will:

Contribute to all phases of product development, from ideation and prototyping to implementation and iteration.
Build and evolve both frontend product experiences and backend services that power them.
Design reliable and scalable backend services to support new features in production.
Modernize and automate legacy workflows in the real estate industry.
Define and ship useful features in partnership with cross-functional teams.
Mentor and support the growth of other engineers on the team.
Collaborate closely with product managers, designers, and operators to identify and solve customer pain points.

What we’re looking for

3+ years of experience building and delivering production-grade software, ideally in fast-paced, high-growth startup environments.
Strong full-stack engineering skills, with a focus on backend scalability and system reliability.
Experience designing, building, and evolving scalable systems and services.
Clear, concise communicator - essential for our remote, highly collaborative team.
Proactive and ownership-driven - comfortable navigating ambiguity and shifting priorities.
Customer-focused mindset with a drive to build solutions that solve real problems.
Strong Python background; experience with TypeScript and React is also a plus.
Experience with workflow automation or complex data integration is a plus.

#LI-AW

Mainstay Built on Trust

At Mainstay, trust is at the core of everything we do. We build trust with everyone - from candidates to employees to partners. We believe in fairness and openness throughout our hiring process, evaluating candidates based on qualifications without regard to race, color, religion, national origin, age, gender, marital status, disability, veteran status, sexual orientation, gender identity, or any other protected status. Our privacy practices describe how we handle applicant information, you can find the policy details for California residents here.

We are committed to providing reasonable accommodations throughout our recruitment processes for candidates with disabilities, pregnancy, religious beliefs, or other reasons protected by applicable laws. If you require assistance or a reasonable accommodation, please contact us at mainstay-recruiting@opendoor.com

Compensation Range: $136K - $208K

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