Senior Full-Stack Software Engineer

About the Company

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.

Responsibilities

• Contribute to all phases of product development, from ideation and prototyping to implementation and iteration
• Design reliable, scalable backend services to support AI-powered features in production
• Build and evolve scalable backend services and APIs that aggregate, enrich, and serve large, complex real estate datasets
• Develop and refine frontend and backend product experiences that make sophisticated data intuitive, trustworthy, and actionable
• Evaluate and benchmark LLM performance across latency, cost, accuracy, and hallucination rates
• Own technical decisions for systems that sit at the center of Mainstay’s SaaS platform
• Partner closely with product managers, designers, data science, and data engineering
• Improve system reliability, performance, and maintainability
• Modernize and automate legacy real estate workflows
• Mentor other engineers through code reviews and technical guidance

Requirements

• 5+ years of experience building and shipping production-grade software in fast-paced startups
• Proven experience developing and deploying production-ready AI features
• Strong full-stack engineering skills with a backend-first orientation
• Deep experience designing and operating scalable backend systems, ideally in Python
• Solid frontend experience with React or similar modern frameworks
• Experience with data-heavy, analytics-driven, or workflow-oriented systems
• Strong technical judgment and communication skills