Senior Full-Stack Software Engineer – Applied AI

🕒 May 22

🏢🏡 San Francisco – Hybrid

⏰ Full Time

🟠 Senior

🧑‍💻 Full-stack Engineer

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Mainstay

WebsiteLinkedInAll Job Openings

51 - 200 employees

Founded 2024

🏠 Real Estate

🛍️ eCommerce

👥 B2C

Real Estate • eCommerce • B2C

Mainstay is a comprehensive platform designed for the residential real estate market that facilitates buying, selling, and managing properties efficiently. It offers expert pricing guidance, property tax management, and streamlined HOA administration, enabling users to navigate single-family rental opportunities with market intelligence and powerful tools. Trusted for its seamless transaction process, Mainstay has contributed to significant closed transactions, enhancing decision-making for both businesses and residents in the real estate sector.

📋 Description

• 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 and directly influence investor decision-making • Partner closely with product managers, designers, data science, and data engineering to translate business needs into durable technical solutions • Improve system reliability, performance, and maintainability as the platform scales • Modernize and automate legacy real estate workflows by replacing manual analysis with software-driven insights • Mentor other engineers through code reviews, technical guidance, and shared ownership of team standards

🎯 Requirements

• 5+ years of experience building and shipping production-grade software in fast-paced and early-stage start up • Proven, hands-on experience developing and deploying production-ready AI features • Highly proficient with AI-first thinking and software development best practices • Strong full-stack engineering skills with a backend-first orientation • Deep experience designing, building, and operating scalable backend systems, ideally in Python • Solid frontend experience with React or similar modern frameworks • Experience working with data-heavy, analytics-driven, or workflow-oriented systems • Strong technical judgment and the ability to balance speed, correctness, and long-term maintainability • Clear, thoughtful communication skills for a remote, highly collaborative team • A proactive, ownership-driven approach to ambiguous problems

🏖️ Benefits

• Professional development opportunities • Flexible working arrangements