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Senior Full-Stack Software Engineer, AI

Mainstay Labs Inc.· Engineering
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Hybrid (San Francisco Bay Area)Full-timePosted 5mo ago

About the role

Senior full-stack engineer role focused on designing and delivering AI-powered workflow systems and features, with end-to-end ownership from retrieval pipelines to user-facing experiences, in a hybrid San Francisco Bay Area environment.

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 at the center of Mainstay’s SaaS platform impacting investor decision-making
  • Partner 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

Qualifications

  • 5+ years of experience building and shipping production-grade software in fast-paced and early-stage startup environments
  • 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

Skills

Required:PythonTypeScriptReact

Benefits

  • Not specified in the description
Last updated Jul 29, 2026. Interested? Apply on the company site.
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About Mainstay Labs Inc.

More insight, more opportunity.

Unlock single-family rental opportunities with comprehensive market intelligence and the tools to make it work for you.

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