AI/ML Engineer at Offerup · Lumi · Lumi

Responsibilities

AI is transforming how millions of people buy, sell, and connect on OfferUp - and this role is at the center of making that happen. As an AI Engineer on the Data team, you will own the production systems — from agentic workflows and RAG pipelines to LLM integrations - that turn our marketplace intelligence into real customer experiences. From enhancing search ranking and personalization to powering fraud detection and generative AI features, your work will have a company-wide impact and be felt by millions of users every day. The Data team reports into the broader engineering organization and directly influences OfferUp s most critical product surfaces.
We are looking for an AI Engineer to join our Data team. This team is tasked with building the core intelligence - supporting search ranking, recommendation engines, fraud detection, and generative AI features - that is critical to OfferUp s success as the leading local marketplace. You will be part of a cross-functional team that includes Data Engineering and Data Science, serving as the bridge that turns research and models into shipped, production-grade AI systems.
What we love about this role:
Breadth of Impact: You won t be siloed; you will build AI systems that drive results across Search Discovery, Trust Safety, Advertising, and core Personalization.
Modern AI Stack: Work with agentic frameworks (LangChain, LangGraph), RAG architectures, and LLM APIs to solve real marketplace problems.
Production Ownership: You will build, ship, and own AI features end-to-end, from design through deployment.
Collaborative Environment: Work alongside Senior Data Scientists and Engineers, positioning you at the intersection of research and production.
Design and build agentic AI systems and RAG pipelines for production features across the marketplace.
Integrate LLMs into product experiences across search, categorization, communication, and trust safety.
Partner with Data Scientists and Engineers to turn research into shipped products.
Here’s more of what you will get to do:
Impact on Product: Deliver the next generation of Search, Personalization, and Trust Safety features powered by reliable, production-quality AI systems.

AI/ML Engineer

Responsibilities

Benefits

Company

Offerup

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