Staff AI Scientist

Join to apply for the Staff Machine Learning Engineer role at TonalJoin to apply for the Staff Machine Learning Engineer role at TonalWho We AreAt Tonal, we know firsthand that too many hurdles stand between each of us and our fitness goals. Drawing on decades of research and a diverse team of experts, we have created the most intelligent strength training system available that makes working out more efficient, effective, and engaging.Who We AreAt Tonal, we know firsthand that too many hurdles stand between each of us and our fitness goals. Drawing on decades of research and a diverse team of experts, we have created the most intelligent strength training system available that makes working out more efficient, effective, and engaging.We are applying our collective knowledge and creativity to reimagine working out, leveraging hardware, software, video content, artificial intelligence and computer vision to help customers achieve their fitness goals.We're passionate about building products that help our customers thrive.OverviewTonal is looking for a Staff Machine Learning Engineer to help expand Tonal’s intelligence across movements, training modalities, and member goals. You’ll be joining a high-impact team at the intersection of machine learning, biomechanics, and product innovation, building algorithms that adapt workouts, enhance coaching, and personalize progression using the largest strength training dataset in the world. With millions of workouts collected across diverse users, and enriched by data from cameras, cable sensors, and external trackers, Tonal has a one-of-a-kind platform for real-world AI.This role will be instrumental in developing models that enable new modalities and movements, detect fatigue, predict performance, define new training metrics, and learn how to relate to effort, engagement, and outcomes.What You Will DoDesign and build advanced machine learning models and algorithms that power personalized training, form feedback, and intelligent progressionAnalyze movement patterns to identify fatigue, inefficiencies, or injury risk using real-world sensor dataDefine new metrics for training effectiveness, effort, and performance beyond traditional volume or weight liftedApply self-supervised and transformer-based learning methods to extract insight from unlabeled or minimally labeled dataPrototype and productionize models that enhance Tonal’s coaching capabilities and member experienceCollaborate with Sports Science, Product, and Software teams to bring new intelligent features to lifeUse analytics to validate model impact, guide feature design, and support continuous learning in deployed modelsMentor teammates and help shape Tonal’s long-term data science and AI roadmapWho You AreA self-driven machine learning scientist with experience owning applied AI projects end-to-end and a passion for building meaningful real-world products7+ years of experience, or 5+ with a Master’s degree, or PhD with 3+ years of experience in applied machine learning or data scienceStrong background in modeling time-series, human motion, or physical sensor data (e.g. force, velocity, pose estimation)Proficient in Python, and familiar with ML frameworks like PyTorch or TensorFlowExperience working with large datasets in modern environments like Databricks or Snowflake.Strong communicator who thrives in cross-functional settings and can simplify complex models for a product audienceDemonstrated ability to experiment rapidly, iterate thoughtfully, and deliver production-level codeExtra CreditExperience deploying ML models to real-time systems or edge devicesExperience with transformer architectures or self-supervised learningBackground in biomechanics, kinesiology, or sports scienceInterest in fitness, performance training, or personalized coachingAt Tonal, we believe that the unique and varied lived experiences of our teammates contribute to our overall strength. We don’t just appreciate differences, we celebrate them, and we always seek people that represent a wide variety of backgrounds. We’re dedicated to adding new perspectives to the team and designing employee experiences that contribute to your growth as much as you do to ours. If your experience aligns with what we’re looking for (even if you don’t check every single box), send us your application. We would love to hear from you!Tonal is committed to meeting the diverse needs of people with disabilities in a timely manner that is consistent with the principles of independence, dignity, integration, and equality of opportunity. Should you have any accommodation requests, please reach out to us via our confidential email, . All requests will be addressed and responded to in accordance with Tonal’s Accessibility Policy and local pensation Range: CA$136K - CA$175KSeniority levelSeniority levelMid-Senior levelEmployment typeEmployment typeFull-timeJob functionJob functionEngineering and Information TechnologyIndustriesWellness and Fitness ServicesReferrals increase your chances of interviewing at Tonal by 2xSign in to set job alerts for “Machine Learning Engineer” roles.Sunnyvale, CA $141,000.00-$202,000.00 2 weeks agoSan Francisco, CA $130,000.00-$230,000.00 5 months agoSoftware Engineer, AI Platform - New GradStaff Software Engineer, AI/ML Recommendations, Rankings, Predictions, YouTubeSunnyvale, CA $141,000.00-$202,000.00 2 weeks agoSan Jose, CA $119,000.00-$177,000.00 2 days agoSan Jose, CA $113,500.00-$250,000.00 1 week agoSan Jose, CA $120,700.00-$228,600.00 1 week agoData Scientist III, Research, Search AdsMountain View, CA $141,000.00-$202,000.00 1 week agoPalo Alto, CA $150,000.00-$220,000.00 3 weeks agoSan Jose, CA $120,700.00-$228,600.00 1 week agoStaff Software Engineer, AI/ML Recommendations, Rankings, Predictions, YouTubeNew Grads 2025 - Software Engineer, AlgorithmSan Jose, CA $120,000.00-$165,000.00 9 months agoData Scientist III, Research, Search AI OverviewMountain View, CA $141,000.00-$202,000.00 1 week agoData Scientist, Energy Analytics, Google CloudSunnyvale, CA $166,000.00-$244,000.00 1 week agoNew Grads 2025 - Software Engineer - Computer Vision/Deep LearningSan Jose, CA $120,000.00-$165,000.00 8 months agoMachine Learning Engineer (I, II, or Sr.)San Francisco Bay Area $115,000.00-$185,000.00 4 weeks agoStaff Data Scientist, Research, Search PlatformsMountain View, CA $197,000.00-$291,000.00 1 week agoSan Francisco, CA $130,000.00-$238,000.00 2 weeks agoMountain View, CA $125,400.00-$188,100.00 2 weeks agoMenlo Park, CA $180,000.00-$200,000.00 4 weeks agoCupertino, CA $1,000.00-$20,000.00 1 month agoNew Grads 2025 - General Software EngineerSan Jose, CA $120,000.00-$165,000.00 5 months agoWe’re unlocking community knowledge in a new way. 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Created: 2025-09-17