Mainstay

Full-stack Engineer

• 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

Senior Full-Stack Software Engineer – Applied AI

• 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
• Fine-tuning existing models and optimize their performance for Mainstay use cases
• Design reliable, scalable backend services to support AI-powered features in production
• Leverage AI to modernize and automate legacy workflows in the real estate industry
• Evaluate and benchmark LLM performance across latency, cost, accuracy, and hallucination rates
• Tune prompts, chain-of-thought logic, and implement retrieval strategies such as RAG and vector stores
• Monitor performance, safety, and cost of LLM-driven features in production environments
• Define and build useful LLM-powered experiences 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

Senior Software Engineer – Applied AI

Engineering Manager

• Lead the entire engineering organization (approximately 25 people) across all product engineering teams.
• Define what an AI-first engineering org actually looks like at Mainstay.
• Build an engineering culture where the bar is high, feedback is direct.
• Make clear, timely decisions about team composition and performance.
• Bring engineering a credible, trusted voice in product decisions.
• Partner with the CPO and product managers on org design, hiring, and how engineering should evolve.

Senior Full-Stack Software Engineer – Applied AI

Senior Software Engineer – Applied AI

Head of Engineering