AI/ML Engineer
About the role
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.
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.
In this role, you will
- 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.
- 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.
You’ll thrive in this role if you have:
- 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.
Compensation Range
$140,000 - $160,000
Benefits (all US roles)
- Health insurance
- Healthcare savings and spending accounts
- Retailer savings plan
- Retirement savings benefits (401(k) plan with match)
- Basic and voluntary life insurance
- Disability benefits
- Paid time off for sick leave, family and/or medical leave, vacation, and 12 company holidays
About OfferUp
OfferUp is dedicated to creating the simplest and most trusted way for people to buy, sell, and connect in their local communities. One of the top local marketplace apps for local buyers and sellers in the U.S., OfferUp makes it easy for people to discover more of what they need—from great deals and secondhand goods to jobs, services, home rentals, and more—right in their own communities. Our trusted platform empowers millions to connect, thrive, and move life forward.
More About OfferUp At a Glance
- 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