AI Engineer (Hybrid @ Bellevue, WA or Remote @ Florida)

The Data team is the engine of intelligence at OfferUp. Our mission is to transform massive amounts of marketplace data into seamless, safe, and personalized experiences that empower millions of people to connect and prosper. We bridge the gap between complex algorithms and real-world customer impact across search, trust & safety, and personalization.

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.

• 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.

• →Impact on Product: Deliver the next generation of Search, Personalization, and Trust & Safety features powered by reliable, production-quality AI systems.
• →Impact on Company: Directly contribute to key business KPIs (conversion, retention, fraud reduction) by turning data science insights into shipped capabilities.
• →Critical Projects: Production RAG pipelines for intelligent discovery; agentic workflows for marketplace automation; tooling and infrastructure for rapid, safe LLM deployment.

• 2-4 years building and deploying AI/ML systems in production.
• 2+ years professional Python development.
• Hands-on experience with agentic frameworks (LangChain, LangGraph, or similar) including function calling and tool-use design.
• Practical experience building RAG systems (vector search, semantic chunking, rerankers).
• Experience with LLM APIs, prompt engineering, and structured outputs.
• Proficiency with async Python (asyncio, streaming) and Pydantic.
• Strong SQL skills for large-scale data systems.
• Bachelor's in CS, Math, Statistics, or related field (or equivalent experience).
• Collaborative mindset and strong communication skills.

• LLMOps tooling: evals (Ragas, DeepEval), observability (LangSmith, Arize Phoenix), guardrails (NeMo).
• Cloud deployment of AI services (AWS preferred).
• GraphRAG or knowledge graph integration (Neo4j/FalkorDB).
• ReAct, Plan-and-Solve, or multi-agent collaboration patterns.

• Top 10 Shopping app in the App Store and Google Play Store for three years
• 15%+ of adults in several major markets use OfferUp every month (LA, Miami, Phoenix, Seattle, Las Vegas, Riverside, Orlando)
• OfferUp works directly with nearly 2000 US law enforcement agencies to build trust in local communities

OfferUp is unleashing the power of local, and we’ve built a dynamic team to do it. To learn more about working at OfferUp, check out https://about.offerup.com/people 

OfferUp provides equal employment opportunities (EEO) to all employees and applicants for employment without regard to race, color, religion, sex, national origin, age, disability, or genetics. In addition to federal law requirements, OfferUp complies with applicable state and local laws governing nondiscrimination in employment in every location in which the company has facilities. This policy applies to all terms and conditions of employment, including recruiting, hiring, placement, promotion, termination, layoff, transfer, leaves of absence, compensation, and training.

OfferUp expressly prohibits any form of workplace harassment based on race, color, religion, gender, sexual orientation, gender identity or expression, national origin, age, genetic information, disability, or veteran status. Improper interference with the ability of OfferUp’s employees to perform their job duties may result in discipline up to and including discharge.