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Senior Machine Learning Engineer, Search & Recommendations
Roku — лидер рынка стриминга с огромной базой пользователей, что гарантирует работу с уникальными данными. Позиция предлагает отличный баланс между исследовательской деятельностью (PhD приветствуется) и реальным внедрением продуктов, а также гибридный формат работы в одном из технологических хабов Великобритании.
Сложность вакансии
Высокая сложность обусловлена требованиями к опыту (8+ лет), наличием ученой степени (PhD предпочтительно) и необходимостью глубоких знаний в узких областях, таких как многокритериальная оптимизация, LLM и причинно-следственный вывод (causal inference). Работа предполагает лидерство в архитектурных решениях и масштабирование систем на миллионы пользователей.
Анализ зарплаты
Указанный диапазон соответствует рыночным ставкам для Senior/Staff ML ролей в Кембридже, где конкуренция за таланты высока из-за присутствия крупных тех-гигантов и исследовательских центров. Кембридж традиционно предлагает зарплаты чуть ниже лондонских, но выше среднего по Великобритании.
Сопроводительное письмо
I am writing to express my strong interest in the Senior Machine Learning Engineer position for Search & Recommendations at Roku. With over 8 years of experience in developing large-scale ML systems and a deep background in deep learning and ranking algorithms, I am confident in my ability to contribute to Roku's mission of connecting the entire TV ecosystem. My expertise in building end-to-end data pipelines using Spark and Airflow, combined with my experience in deploying transformer-based models, aligns perfectly with your team's technical requirements.
Throughout my career, I have focused on bridging the gap between complex algorithmic research and production-ready software. I am particularly drawn to Roku's pragmatic approach to innovation and the opportunity to apply state-of-the-art techniques like multi-modal representation learning and causal inference to enhance user discovery. I am eager to bring my technical leadership and problem-solving skills to your Cambridge-based team to drive the next generation of search and monetization features.
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Присоединяйтесь к команде Roku в Кембридже и создавайте будущее стриминга для миллионов пользователей по всему миру!
Описание вакансии
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.
About the team
Roku is the No. 1 TV streaming platform in the U.S., Canada, and Mexico with 70+ millions of active accounts. Roku pioneered streaming to the TV and continues to innovate and lead the industry. We believe Roku’s continued success relies on its investment in our machine learning/ML recommendation engine. Roku enables our users to access millions of contents including movies, episodes, news, sports, music and channels from all around the world.
About the role
The depth of query, content and user understanding using ML is key to user happiness in their search journey. Solving this customer problem is why we're actively looking for a Senior Machine Learning Engineer, Search & Recommendations to drive further innovation in search and discovery. The person in this role will leverage their technical skills, business intuition, and analytical thinking to build best of class AI powered products. Hence, communication and presentation skills are important. The role requires both high technical acumen and problem-solving abilities, motivation, and exceptional attention to detail. Every day, you'll look at what exists and find ways to make it better.
What you'll be doing
- Apply state of the art ML on search using techniques in deep learning, bandits, transformers, LLMs, causal inference, and optimisations to make our users more delighted and engaged on the platform
- Run online AB tests and analyse them against the critical business KPIs
- Collaborate with US engineering teams as well as cross-functional teams to translate business requirements into technical specifications
- Nurture our ML ecosystem to make it withstand scale, developer velocity and future business shifts
- Provide technical leadership to drive technical and ML roadmap for search ranking and monetisation
- Help in recruiting new engineers. Interview, train, and mentor new team members
We're excited if you have
- 8+ years of experience (or PhD with 6 years of experience) applying Machine Learning to concrete problems at large-scale in domains like recommendation or search or ads
- Strong CS fundamentals. Should be able covert ideas to code with ease
- 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
- We'd love to see that you've worked with big data systems (Spark, S3, and Airflow) and can program (Java, Scala, or Python)
- Good understanding of system architecture. Have experience in big data technologies and streaming architecture, data pipelines, etc.
- MS in Computer Science, Statistics, or related field, but a Ph.D. in CS or related fields is preferred
#LI-MS3
Our Hybrid Work Approach
Roku fosters an inclusive and collaborative environment where teams work in the office Monday through Thursday. Fridays are flexible for remote work except for employees whose roles are required to be in the office five days a week or employees who are in offices with a five day in office policy.
Benefits
Roku is committed to offering a diverse range of benefits as part of our compensation package to support our employees and their families. Our comprehensive benefits include global access to mental health and financial wellness support and resources. Local benefits include statutory and voluntary benefits which may include healthcare (medical, dental, and vision), life, accident, disability, commuter, and retirement options (401(k)/pension). Our employees can take time off work for vacation and other personal reasons to balance their evolving work and life needs. It's important to note that not every benefit is available in all locations or for every role. For details specific to your location, please consult with your recruiter.
Accommodations
Roku welcomes applicants of all backgrounds and provides reasonable accommodations and adjustments in accordance with applicable law. If you require reasonable accommodation at any point in the hiring process, please direct your inquiries to EmployeeRelations@Roku.com.
The Roku Culture
Roku is a great place for people who want to work in a fast-paced environment where everyone is focused on the company's success rather than their own. We try to surround ourselves with people who are great at their jobs, who are easy to work with, and who keep their egos in check. We appreciate a sense of humor. We believe a fewer number of very talented folks can do more for less cost than a larger number of less talented teams. We're independent thinkers with big ideas who act boldly, move fast and accomplish extraordinary things through collaboration and trust. In short, at Roku you'll be part of a company that's changing how the world watches TV.
We have a unique culture that we are proud of. We think of ourselves primarily as problem-solvers, which itself is a two-part idea. We come up with the solution, but the solution isn't real until it is built and delivered to the customer. That penchant for action gives us a pragmatic approach to innovation, one that has served us well since 2002.
To learn more about Roku, our global footprint, and how we've grown, visit https://www.weareroku.com/factsheet.
By providing your information, you acknowledge that you want Roku to contact you about job roles, that you have read Roku's Applicant Privacy Notice, and understand that Roku will use your information as described in that notice. If you do not wish to receive any communications from Roku regarding this role or similar roles in the future, you may unsubscribe at any time by emailing WorkforcePrivacy@Roku.com.
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Навыки
- Machine Learning
- Deep Learning
- Search
- Recommendation Systems
- Natural Language Processing
- Large Language Models
- Python
- Java
- Scala
- Apache Spark
- Apache Airflow
- Causal Inference
- Transformers
- A/B Testing
Возможные вопросы на собеседовании
Вакансия требует опыта в ранжировании поиска и рекомендациях. Важно понять, как кандидат оценивает успех модели в реальном бизнесе.
Как бы вы спроектировали систему ранжирования для поиска контента, учитывая баланс между релевантностью запросу и бизнес-метриками (например, монетизацией)?
В описании упоминаются LLM и трансформеры. Это поможет оценить практический опыт работы с современным стеком NLP.
Опишите ваш опыт внедрения трансформеров или LLM в системы поиска. С какими проблемами задержки (latency) вы сталкивались и как их решали?
Роль предполагает проведение онлайн AB-тестов. Важно уметь интерпретировать результаты.
Как вы подходите к анализу результатов AB-тестов, если основные KPI (например, CTR) растут, а долгосрочные метрики удержания (retention) падают?
Требуется опыт работы с Big Data (Spark, Airflow). Вопрос проверяет навыки построения надежных пайплайнов.
Расскажите о самом сложном случае отладки (debugging) распределенного пайплайна данных в Spark. Как вы обеспечиваете воспроизводимость ML-экспериментов?
Позиция Senior подразумевает менторство и лидерство.
Как вы подходите к код-ревью и архитектурному планированию в команде ML-инженеров? Приведите пример, когда вам приходилось убеждать команду принять сложное техническое решение.
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