Senior Data Scientist

Job Description

Are you a Data Scientist who is passionate about using Machine Learning to create and deliver value using data Poshmark is looking for a Senior Data Scientist who can independently drive Data Science initiatives. As a market leader in Social Commerce, Poshmark faces a unique opportunity to utilize our massive multi-platform social and commerce data to shape social commerce and create value for our users. With 400+ MM events per day and 30+ terabytes of exponentially growing data, Poshmark presents a unique opportunity to innovate cutting edge data science products. This person will work on all Data Science initiatives across product, marketing, Posh markets, operations and community and help solve some of the most challenging problems in social commerce like pricing, search ranking, product and people recommendation, fraud prevention and many more.Key responsibilities

• Help develop vision, business case, modeling spec and operational project plans for end-to-end ML solution
• In partnership with data leaders and ML engineering team, lead hands-on development of data science/machine learning models for high business impact opportunities across all business areas
• Work on all stages of a data science / ML project - exploration and conceptualization, POC (proof of concept), data preparation, model development and testing, deployment, monitoring and debugging, continuous improvement
• Partner with product, data engineering and ML engineering teams to ensure seamless productionzation of developed algorithm and management of full model cycle for business application
• Follow best practices for developing, managing, maintaining and documenting machine learning models and all related work
• Develop a deep understanding of different business functions and core KPI to ensure that the data science solution fits the business need
• Define and abstract standard building blocks for usage across multiple ML algorithms. Lead productization, development and maintenance of these. For example, feature library, model testing automation, model validation and recommendation automation
• Innovate new solutions for unique challenges facing Poshmark. Publish academic papers, white papers, blog posts and present in leading conferences.

Qualifications and skills

• 4+ years of hands-on experience in building scalable Machine Learning based solutions in a Big Data environment.
• Fluency in all steps of data science solution development cycle from business problem identification to business value delivery
• Ability to do insightful data analysis both pre and post ML model development to estimate impact, establish feasibility, understand model performance, validate hypothesis and answer questions from stakeholders
• Expert level hands-on / applied knowledge of key machine learning algorithms
• Ability to choose a technique based on the problem and the data, ability to debug and reason about why a model may not be working as expected
• Expert hands-on knowledge of Python and data science / ML packages
• Expert hands-on knowledge of SQL with the ability to write readable and efficient queries for complex data crunching
• Hands-on experience in using Spark (Scala or Pyspark) to process data at large scale
• Hands-on experience in using MS Excel to do quick exploratory data analysis using basic functions, pivot tables and charts
• Experience partnering with ML engineering teams in deploying ML models to production
• Strong business / product sense and excellent verbal and written communication skills for a variety of audiences: executive teams, product managers, engineers, and business leaders
• Excellent problem solving skills coupled with a passion to solve challenging problems using data science/ML with focus on delivering business value
• PhD or MS in a relevant quantitative field such as Statistics, Math, Computer Science is a huge plus

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Keyskills :
machine learninganalyticssqlalgorithmsoracle dbaexploratory data analysisbig datadata sciencewhite paperspivot tablesdata analysis