Senior Software Engineer, Machine Learning (Commerce)

📋 Description

• Architect and own the ML foundations for commerce discovery: user, item, and interaction embeddings that power personalized recommendations across shop surfaces (homepage, cart, post-purchase, wishlist, and more).
• Design and deploy scalable real-time recommendation and ranking systems that support a growing catalog of 1P and 3P items across heterogeneous game publisher inventories.
• Build ML-powered marketing targeting systems that identify the right users for campaigns — new buyer discounts, drop campaigns, weekly deals, and seasonal promotions — driving conversion without conditioning users to wait for discounts.
• Leverage Discord's social graph to build social commerce ML: gifting recipient prediction, group buying conversion modeling, and friend-group recommendations that differentiate Discord from traditional game storefronts.
• Drive deep learning A/B testing infrastructure and model monitoring to translate experimentation results into actionable product decisions.
• Partner closely with Shop, Game Commerce, Revenue Infra, ML Infra and Data Engineering teams to define ML requirements, surface integration points, and influence the commerce roadmap.

🎯 Requirements

• 4+ years of experience as a Machine Learning Engineer, with a track record of owning and shipping recommendation or personalization systems end-to-end.
• Deep expertise in applied deep learning — particularly embedding models, two-tower architectures, and retrieval/ranking systems for e-commerce or content recommendation.
• Strong proficiency in Python and deep learning frameworks (PyTorch preferred).
• Experience building and operating real-time ML serving infrastructure at scale, including feature stores, model serving, and A/B testing frameworks.
• Demonstrated ability to work in early-stage, high-ambiguity environments and build ML systems from the ground up, not just improve existing ones.
• Strong cross-functional collaboration with product, engineering, data science, and business stakeholders.