Senior Software Engineer, Machine Learning

Teamwork makes the stream work. Roku is changing how the world watches TV Roku is the #1 TV streaming platform in the U.S., Canada, and Mexico, and we've set our sights on powering every television in the world. Roku pioneered streaming to the TV. Our mission is to be the TV streaming platform that connects the entire TV ecosystem. We connect consumers to the content they love, enable content publishers to build and monetize large audiences, and provide advertisers unique capabilities to engage consumers. From your first day at Roku, you'll make a valuable - and valued - contribution. We're a fast-growing public company where no one is a bystander. We offer you the opportunity to delight millions of TV streamers around the world while gaining meaningful experience across a variety of disciplines. What is the role? Roku's footprint has more than quadrupled in the past five years, and user expectations have leaped just as fast—think LLM-based query understanding, vector-DB retrieval, on-device models, and multimodal search (voice, text, image). We're now rebuilding our relevance stack for the next decade, blending classic IR with generative-AI techniques. You will be a technical leader spearheading that transformation. How will I use AI at Roku? At Roku, we don’t just use AI, we work with it. AI agents and smart tools help power drafts, analysis, and repetitive workflows, while our people bring direction, judgment, and accountability. We’re looking for curious, adaptable builders who can show how they’ve used AI or automation to move faster, raise the bar, and scale their impact. We value your AI skills if you have built fluency across the agentic engineering toolchain — coding harnesses like Claude Code or Cursor, MCP servers, custom skills, or agent frameworks. And you can describe projects where you shipped real work with these tools. You know how to drive an agent, verify its output, and ramp on an unfamiliar codebase with an agent helping you. What are the responsibilities of the role? p]:inline" data-streamdown="list-item">Apply state of the art ML on search using techniques in deep learning, bandits, transformers, LLMs, causal inference, and optimizations to make our users more delighted and engaged on the platform p]:inline" data-streamdown="list-item">Run online AB tests and analyze them against the critical business KPIs p]:inline" data-streamdown="list-item">Collaborate with US engineering teams as well as cross-functional teams to translate business requirements into technical specifications p]:inline" data-streamdown="list-item">Nurture our ML ecosystem to make it withstand scale, developer velocity and future business shifts p]:inline" data-streamdown="list-item">Provide technical leadership to drive technical and ML roadmap for search ranking and monetization p]:inline" data-streamdown="list-item">Help recruiting new engineers. Interview, train, and mentor new team members What experience would help someone be successful in this role at Roku? p]:inline" data-streamdown="list-item">6+ years of experience (or PhD with 5 years of experience) applying Machine Learning to concrete problems at large-scale in domains like recommendation or search or ads p]:inline" data-streamdown="list-item">Strong CS fundamentals. Should be able covert ideas to code with ease p]:inline" data-streamdown="list-item">Good understanding of machine learning fundamentals like classification, deep neural nets, and sequence-based models. Familiarity with modern NLP stack and multi-modal representation learning is a plus p]:inline" data-streamdown="list-item">We'd love to see that you've worked with big data systems (Spark, S3, and Airflow) and can program (Java, Scala, or Python) p]:inline" data-streamdown="list-item">Good understanding of system architecture p]:inline" data-streamdown="list-item">Experience in big data technologies and streaming architecture, data pipelines, etc. p]:inline" data-streamdown="list-item">MS in Computer Science,…