Machine Learning Engineer, Growth

Machine Learning Engineer on Whatnot's Buyer Growth team, building and owning ML models for onboarding and user targeting to accelerate buyer growth and improve first-time conversions.

Responsibilities

• Lead the design, development, and productionization of ML models that power user acquisition, activation, and retention, including ranking models, targeting systems, and uplift modeling.
• Own the full ML lifecycle: build data pipelines, feature engineering, model training, deployment, and online experimentation; establish feedback loops from postbacks, conversions, and downstream revenue signals.
• Identify high-impact opportunities to unlock growth with ML, collaborating with product, engineering, data, and marketing stakeholders.
• Drive technical excellence and establish ML best practices across the Buyer Growth team.

Requirements

• 5+ years of industry experience building and deploying ML systems at scale.
• Proven success leading end-to-end ML projects that delivered measurable business outcomes.
• Deep expertise in personalization, ranking, or user modeling; strong intuition about consumer behavior in apps.
• Advanced proficiency in Python, SQL, and common ML frameworks (PyTorch, TensorFlow, XGBoost).
• Strong communication and leadership skills with the ability to influence roadmap and align cross-functional teams.

Technologies

• Python
• SQL
• PyTorch
• TensorFlow
• XGBoost

Details

• Location: Los Angeles, CA (remote)
• Salary: USD 190,000 - 280,000 per year
• Experience: 5+ years

Benefits

• Flexible Time off Policy and Company-wide Holidays (including spring and winter breaks)
• Health Insurance options including Medical, Dental, Vision
• Work From Home Support
• Home office setup allowance
• Monthly allowance for cell phone and internet
• Care benefits
• Monthly allowance for wellness
• Annual allowance towards childcare
• Lifetime benefit for family planning, such as adoption or fertility expenses
• Retirement; 401k with Traditional and Roth accounts in the US (employer match up to 4%) and Pension plans internationally
• Monthly allowance to dogfood the app
• Parental Leave: 16 weeks paid, plus one month gradual return to work; leave allowances align with local requirements