Job Overview
Location
Remote
Job Type
Full-time
Category
Software Engineering
Date Posted
May 10, 2026
Full Job Description
đź“‹ Description
- • Senior Software Engineer, Applied AI role focused on designing, building, and shipping AI-powered workflow management systems for the single family rental industry
- • Day-to-day responsibilities include fine-tuning and optimizing LLMs, designing retrieval pipelines and guardrails, building backend services, evaluating LLM performance, and mentoring other engineers
- • Mainstay is an AI-native market intelligence platform founded within Opendoor, now independent and backed by Khosla Ventures, dedicated to transforming real estate operations through trusted AI solutions
- • Opportunity to shape AI-driven product experiences from ideation to launch, work on cutting-edge LLM applications, and make tangible impact in a fast-growing industry while growing technical leadership skills
🎯 Requirements
- • 5+ years of experience building and delivering production-grade software, ideally in fast-paced, high-growth startup environment
- • At least 3 years of hands-on experience developing and deploying production-ready AI features (LLM applications, fine-tuning, RAG systems, guardrails, evals, etc.)
- • Strong full-stack engineering skills with a focus on backend scalability and system reliability
- • Experience fine-tuning and deploying LLMs
- • Deep understanding of LLM evaluation methods, including prompt testing, retrieval precision, hallucination detection, and cost/performance tradeoffs
- • Experience building custom eval pipelines using techniques like model-as-a-judge or embedding similarity
🏖️ Benefits
- • Opportunity to work on AI-native products transforming the single family rental industry
- • Remote work flexibility with a highly collaborative team
- • Chance to mentor and support the growth of other engineers
- • Exposure to cutting-edge AI/ML tools including LangGraph, AutoGen, CrewAI, and custom agent systems
- • Involvement in end-to-end AI feature development from retrieval pipelines to user-facing experiences
- • Backed by Khosla Ventures with recent Series A funding, offering stability and growth potential
Skills & Technologies
About Mainstay Technologies
Mainstay Technologies is a U.S.-based managed IT services and cybersecurity provider serving small- to mid-sized organizations across New England. The company delivers 24/7 monitoring, cloud migration, network design, data backup, compliance consulting, and help-desk support from its offices in New Hampshire and Massachusetts. Founded in 2004, Mainstay partners with clients to align technology with business goals, reduce risk, and control costs through predictable, subscription-based pricing and documented best-practice frameworks.
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