Sr. Software Engineer, Machine Learning

📋 Description Write production Python that powers real-time bidding, model training, and campaign optimization Train, deploy, and monitor ML models that decide which ads to show, when, and at what price: millions of bid decisions per second Build and improve our incrementality measurement systems: helping advertisers understand the true causal lift of their CTV spend Design and implement new ML products across the ad-buying lifecycle: audience targeting, bid optimization, pacing, and attribution Use LLMs and generative AI to build internal tools that accelerate how we develop, test, and ship ML systems Serve as a technical lead and mentor on a distributed engineering team 🎯 Requirements Strong production Python skills: you write code that runs in prod, not just notebooks Solid statistics and ML fundamentals: experiment design, model evaluation, and when simpler approaches beat complex ones Familiarity with modern AI tools and good judgment about where they add value Adtech or CTV experience: familiarity with RTB, programmatic advertising, supply-path optimization Clear written communication: writing is how decisions get made on a distributed team Comfort with ambiguity: own problems end-to-end in a fast-moving environment, from scoping to shipping Bachelor's degree in CS/Math/Engineering or equivalent; 4+ years of industry experience 🎁 Benefits Equity eligibility PinFlex flexible working model (remote options) Inclusive, equitable workplace Relocation not offered