[Remote] Senior Machine Learning Engineer

Note: The job is a remote job and is open to candidates in USA. Reddit, Inc. is a community-driven platform that facilitates open and authentic conversations among its users. They are seeking a Senior Machine Learning Engineer to design and build production machine learning systems that enhance user experience and optimize advertising solutions across the platform.ResponsibilitiesDesign, build, and deploy production-grade machine learning models and systems at scaleOwn the full ML lifecycle: from problem definition and feature engineering to training, evaluation, deployment, and monitoringBuild scalable data and model pipelines with strong reliability, observability, and automated retrainingWork with large-scale datasets to improve ranking, recommendations, search relevance, prediction, content/user understanding, and optimization systemsPartner cross-functionally with Product, Data Science, Infrastructure, and Engineering teams to translate complex problems into ML solutionsImprove system performance across latency, throughput, and model quality metricsResearch and apply state-of-the-art machine learning and AI techniques, including deep learning, graph & transformers based, and LLM evaluation/alignmentContribute to technical strategy, architecture, and long-term ML roadmapSkills3-5+ years of experience building, deploying, and operating machine learning systems in productionStrong programming skills in Python, Java, Go, or similar languages, with solid software engineering fundamentalsML Fundamentals: a strong grasp of algorithms, from classic statistical learning (XGBoost, Random Forests, regressions) to DL architectures (Transformers, CNNs, GNNs)Hands-on experience with modern ML frameworks (e.g., PyTorch, TensorFlow)Experience designing scalable ML pipelines, data processing systems, and model serving infrastructureAbility to work cross-functionally and translate ambiguous product or business problems into technical solutionsExperience improving measurable metrics through applied machine learningExperience with recommender systems, search/ranking systems, advertising/auction systems, large-scale representation learning, or multimodal embedding systemsFamiliarity with distributed systems and large-scale data processing (Spark, Kafka, Ray, Airflow, BigQuery, Redis, etc.)Experience working with real-time systems and low-latency production environmentsBackground in feature engineering, model optimization, and production monitoringExperience with LLM/Gen AI techniques, including but not limited to LLM evaluation, alignment, fine-tuning, knowledge distillation, RAG/agentic systems and productionizing LLM-powered products at scaleAdvanced degree in Computer Science, Machine Learning, or related quantitative fieldBenefitsComprehensive Healthcare Benefits and Income Replacement Programs401k with Employer MatchGlobal Benefit programs that fit your lifestyle, from workspace to professional development to caregiving supportFamily Planning SupportGender-Affirming CareMental Health & Coaching BenefitsFlexible Vacation & Paid Volunteer Time OffGenerous Paid Parental LeaveEquity in the form of restricted stock unitsCommissionMedical, dental, and vision insurance401(k) program with employer matchGenerous time off for vacationParental leaveCompany OverviewReddit is the heart of the internet, where millions of people get together to talk about any topic imaginable. It was founded in 2005, and is headquartered in San Francisco, California, USA, with a workforce of 1001-5000 employees. Its website is https://www.redditinc.com.Company H1B SponsorshipReddit, Inc. has a track record of offering H1B sponsorships, with 22 in 2026, 99 in 2025, 63 in 2024, 76 in 2023, 70 in 2022, 68 in 2021, 39 in 2020. Please note that this does not guarantee sponsorship for this specific role.