OfferUp · 6 hours ago
Senior Data Scientist (Hybrid @ Bellevue, WA or Remote @ Florida)
Hybrid @ Bellevue, WA or Remote @ Florida
Full-time
Hybrid
Senior Level
$190K/yr - $220K/yr
5+ years expOfferUp is dedicated to creating the simplest and most trusted way for people to buy, sell, and connect in their local communities. They are looking for a Senior Data Scientist to join their Data team, where the role involves leading the research, design, and implementation of machine learning solutions to enhance marketplace intelligence and improve customer experiences.
AppsClassifiedsE-CommerceE-Commerce PlatformsMarketplaceMobileMobile Payments
Responsibilities
Lead the research, design, and implementation of end-to-end machine learning solutions, from initial hypothesis and data exploration to A/B testing and production deployment
Own the evaluation and "prompt engineering" strategy for Large Language Models (LLMs) to enhance product features like automated categorization and user communication
Act as a strategic partner to Product and Engineering leaders, translating business goals into data science roadmaps that prioritize long-term customer experience over short-term gains
Drive the next generation of Search and Personalization features; use LLMs to create "magic moments" for users while ensuring model outputs are safe, accurate, and valuable
Directly influence key business KPIs (e.g., conversion, retention, fraud reduction) by identifying untapped opportunities within our BigQuery data warehouse
Optimize our search ranking algorithms using modern learning-to-rank techniques; develop a robust framework for assessing and deploying LLM-based agents; refine our "Crime Risk" and user reputation models to maintain a safe marketplace
Qualification
Required
5+ years of building and shipping ML models and data solutions with quality
4+ years of professional software development in Python
Strong proficiency in querying and retrieving data using SQL from large-scale distributed systems
Ph.D. or Master's Degree in Computer Science, Mathematics, Statistics, or a related technical field OR Bachelor's degree and relevant work experience
Deep understanding in a classical NLP method (e.g. n-grams, NER, POS tagging) and ML tasks (e.g. semantic analysis, text classification)
Proficiency in deep learning frameworks such as PyTorch, TensorFlow or Keras
Proven track record of mentoring junior or mid-level team members and performing high-quality code and design reviews
Collaborative mindset with experience contributing to project roadmaps and technical documentation
Impact-oriented: Experience delivering end-to-end projects that solve complex business problems
Strong communication skills, with the ability to explain technical concepts to non-technical stakeholders
Preferred
Practical experience with LLMs, deep models (RNN, LSTM) and their applications is highly preferred
Experience training models in cloud environments (Databricks/Sagemaker preferred)
Experience deploying models as microservices within cloud infrastructure (AWS preferred)
Hands-on experience with Spark for large-scale data processing
Working knowledge of deep learning methods applied to images (CNNs, ResNet)
Benefits
Health insurance
Healthcare savings and spending accounts
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
12 company holidays
Flexible vacation policy
Company
OfferUp
OfferUp provides an online and mobile C2C marketplace app for people to buy and sell electronics, furniture, and cars.
201-500 employees
H1B Sponsorship
OfferUp has a track record of offering H1B sponsorships. Please note that this does not
guarantee sponsorship for this specific role. Below presents additional info for your
reference. (Data Powered by US Department of Labor)
Distribution of Different Job Fields Receiving Sponsorship
Represents job field similar to this job
Trends of Total Sponsorships
2025 (3)
2024 (13)
2023 (1)
2022 (10)
2021 (4)
2020 (22)
Funding
Current Stage
Late StageTotal Funding
$380.99MKey Investors
PobtsNotable CapitalMax Levchin
2020-03-25Series Unknown· $120M
2018-08-09Series D· $39M
2016-11-16Series D· $11M
Leadership Team
Nick Huzar
Co-Founder & Board Director
Ian Fliflet
Chief Growth Officer
Recent News
Company data provided by crunchbase