Machine Learning Engineer, Ads

Join to apply for the Machine Learning Engineer, Ads role at Reddit, Inc. Reddit is a community of communities where people can dive into anything through experiences built around their interests, hobbies and passions. Our mission is to bring community, belonging, and empowerment to everyone in the world. Reddit users submit, vote, and comment on content, stories, and discussions about the topics they care about the most. For more information, visit redditinc.com. Reddit has a flexible workforce If you live near an office, you can come in; you can also apply to work remotely in any country in which we have a physical presence. Team Description Reddit is poised to rapidly innovate and grow. We’re hiring across multiple teams including: Ads Measurement Modeling, Ads Targeting & Retrieval, Advertiser Optimization, and Ads Marketplace Teams. Ads Measurement Modeling Team This horizontal ML team in the Ads Measurement org works on proving the value of Reddit Ads to advertisers while ensuring privacy compliance. Their projects address signals, privacy, and identity, including Modeled Identity, Modeled Conversions, and enhancements for ATT opt-out utility. Ads Targeting and Retrieval Team This team designs and builds large-scale ML systems to improve targeting products. Their work spans offline and online retrieval systems that enhance contextual and behavioral targeting, helping advertisers reach the most relevant audiences. Advertiser Optimization Team This group consists of two horizontal teams focused on advertiser outcomes. The Recommendations and Forecasting team builds ML-driven tools for advertisers and sales, while the Bidding/Pacing team develops algorithms and customer-facing products like TCPA, TROAS, and performance advertising solutions. They work on marketplace dynamics, bidding and pacing innovations, and new advertiser tools. Ads Marketplace Quality Team This team improves the efficiency of Reddit’s ads marketplace by developing algorithms for auction and pricing optimization, directly impacting advertiser and user value. They also contribute to strategic initiatives such as supply optimization and ad relevance, aiming to show the right ads to the right users at the right time and context. The Ads Creative Effectiveness Team This newly formed group aims to improve ad creative at Reddit through generative and predictive products. We train, adapt and finetune LLMs/VLMs to help advertisers create impactful images, videos and text. We build performance predictors to understand and rank ad components, ensuring the advertiser ships the best possible campaigns. We construct insight and recommendation engines to guide advertisers toward best practices and key enhancements. Role Description Join the Ads team as a Machine Learning Engineer and become a key contributor to Reddit’s business. In this hands-on role, you will be responsible for the full lifecycle of our ML systems, from initial research and modeling to deployment and optimization in production. Your work will directly impact how we deliver relevant ads and drive value for our advertisers across areas like ad ranking, bidding, measurement, and optimization . Responsibilities Design, build, and deploy industrial-level machine learning models to solve critical problems in ad ranking, bidding, and optimization. Take full ownership of the ML lifecycle, from ideation and research to building scalable serving systems and maintaining models in production. Perform systematic feature engineering to transform raw, diverse data into high-quality features that drive model performance. Work closely with product managers, data scientists, and engineers to translate business challenges into effective ML solutions. Improve the reliability and stability of ML systems by building robust monitoring, alerting, and automated retraining pipelines. Research new algorithms, stay up-to-date with state-of-the-art ML techniques, and contribute to the team’s strategy and roadmap. Required Qualifications At least 3+ years of end-to-end experience in training, evaluating, and deploying machine learning models in a production environment. Proficient in one or more general-purpose programming languages (e.g., Python, Scala) and have a solid understanding of software development best practices. Hands-on experience with a major machine learning framework (e.g., TensorFlow, PyTorch) and a deep understanding of core ML concepts and algorithms. Proven ability to work effectively with cross-functional teams, including product managers and data scientists, to translate business needs into technical solutions. Track record of using machine learning to drive KPI wins and solve complex, real-world problems. Bonus Points Experience working in the Ads domain Experience or interest in the advertising business and understanding customer needs An advanced degree (MS/PhD) in a quantitative field Familiarity with distributed systems and large-scale data processing technologies (e.g., Spark, Kafka) In select roles and locations, interviews may be recorded, transcribed, and summarized by AI. You will have the option to opt out of recording, transcription, and summarization prior to any scheduled interviews. During the interview, we may collect personal information categories to evaluate your application. We will not sell your information or disclose it for marketing purposes. We will delete any interview recording promptly after a hiring decision. For more information, see our Candidate Privacy Policy for Potential Employees and Contractors. Reddit is proud to be an equal opportunity employer and is committed to building a workforce representative of the diverse communities we serve. Reddit provides reasonable accommodations for qualified individuals with disabilities and disabled veterans in our job application procedures. If you need an accommodation during the interview process, please let your recruiter know. Seniority level: Associate Employment type: Full-time Job function: Engineering and Information Technology Industries: Social Networking Platforms Referrals increase your chances of interviewing at Reddit, Inc. by 2x Get notified about new Machine Learning Engineer jobs in Ontario, Canada . #J-18808-Ljbffr