Senior Full-Stack Software Engineer

About the role

Join Mainstay to build AI-driven systems that transform the single-family rental industry. You will have significant autonomy and direct customer feedback as you tackle complex product challenges. This role involves designing and deploying sophisticated AI workflow tools that empower our operations team.

Key facts

What you'll do

• Participate in all stages of product creation, from initial concepts to final delivery and ongoing improvements.
• Develop dependable, scalable backend services to support AI features in a live environment.
• Construct and advance backend services and APIs that consolidate, enhance, and present extensive real estate data.
• Create and refine user interfaces and backend functionalities that make complex data understandable, reliable, and actionable.
• Assess and compare the performance of Large Language Models concerning speed, expense, accuracy, and the generation of incorrect information.
• Take ownership of technical decisions for critical systems within Mainstay's platform that influence investor choices.
• Collaborate with product managers, designers, and data teams to turn business needs into lasting technical solutions.
• Enhance system reliability, performance, and ease of maintenance as the platform expands.
• Modernize and automate existing real estate processes by replacing manual analysis with software-driven insights.
• Guide other engineers through code reviews, technical advice, and shared responsibility for team standards.

Requirements

• A minimum of 5 years of experience developing and launching production-ready software in a dynamic, early-stage startup environment.
• Demonstrated practical experience in creating and deploying AI features for production use.
• Strong understanding of AI-first principles and established software development practices.
• Proficient full-stack engineering abilities with a primary focus on backend development.
• Extensive experience in designing, building, and managing scalable backend systems, preferably using Python.
• Solid frontend development skills with React or comparable modern frameworks.
• Experience with systems that handle large amounts of data, are analytics-focused, or manage workflows.
• Sound technical judgment, with the ability to balance speed of delivery, accuracy, and long-term system health.
• Clear and effective communication skills for a remote, collaborative setting.
• A proactive approach to problem-solving with a strong sense of ownership.

Nice to have

• Experience working on high-impact systems that directly influence how institutional investors allocate capital.
• Enjoyment in taking ownership of complex technical challenges from start to finish.
• Interest in working at the intersection of data, product development, and business strategy.
• Comfort in influencing technical direction and elevating engineering quality standards.
• Thriving in environments that offer autonomy, responsibility, and evolving priorities with a strong sense of ownership.

Skills & tools

• Languages: Python, TypeScript
• Backend: FastAPI, Django
• Frontend: React, Next.js
• Data: Airflow, dbt, Snowflake, PostgreSQL
• Infrastructure: AWS, Terraform
• Tooling: GitHub

Practical notes

Mainstay is committed to fair hiring practices and provides reasonable accommodations for candidates with disabilities, pregnancy, religious beliefs, or other protected reasons. For accommodation requests, please contact Mainstay-recruiting@opendoor.com. California residents can find details on our privacy practices here.

About the company

Mainstay is a Christian rock band from Minneapolis, USA. The group formed in the early 2000s and built a following through regional touring and independent releases. Their sound blends melodic rock with lyrics centered on faith and personal struggle. The band signed with BEC Recordings, a label known for contemporary Christian music. They released their major label debut album Well Meaning Fiction in 2005. The record featured the single Take Away which received airplay on Christian rock radio stations. The band toured nationally with acts such as Relient K and Mae. Their music appeared on compilation albums and festival lineups including Spirit West Coast. The group went on hiatus in the late 2000s as members pursued other careers and family commitments. Mainstay left a catalog of two studio albums and several EPs. Their work remains available on streaming platforms and continues to reach listeners in the Christian rock niche. The band's history reflects the trajectory of many mid-2000s faith-based rock groups that balanced ministry goals with music industry demands.