Research Scientist, Personalization

Ernst & König GmbH; Greater London; Hybrid; GBP 90,000 - 130,000; Full time

Benefits offered by this job

Extensive learning opportunities

Flexible share incentives

Global parental leave

All The Feels employee assistance

Job summary

Spotify’s Personalization team is seeking a researcher to advance ML/AI for large-scale personalization. You will design experiments, develop models and evaluation frameworks, and contribute to publications and talks while collaborating with cross-functional partners to shape long-term product opportunities.

You will have a Master’s or PhD in ML/AI or equivalent experience, with proven publications and hands-on expertise in reinforcement learning and post-training methods for large models.

Qualifications

• PhD or Master’s in machine learning, AI or a related field, or equivalent research experience.
• Demonstrated expertise in ML/AI through peer-reviewed publications at major conferences.
• Experience with post-training methods and reinforcement learning for large models.

Responsibilities

• Conduct original research in ML/AI focusing on foundation models, generative AI and post-training methods.
• Develop novel methodologies, models and evaluation frameworks for personalization systems.
• Design and run rigorous experiments to validate research hypotheses.
• Collaborate with cross-functional teams to translate insights into product opportunities.

Skills

Machine learning

Reinforcement learning

Experiment design

Large-scale models

Research methods

Collaboration

Education

Master’s or PhD in ML/AI or related field

Job description

The Personalization team makes deciding what to play next easier and more enjoyable for every listener. From Blend to Discover Weekly, we’re behind some of Spotify’s most-loved features. We built them by understanding the world of music and podcasts better than anyone else. Join us and you’ll keep millions of users listening by making great recommendations to each and every one of them.Spotify’s

Personalization organization builds the technology that helps millions of listeners discover what they love. Within this space, our research team focuses on advancing the state of the art in machine learning and AI to shape the future of personalization. We explore new approaches, challenge existing assumptions, and contribute to the broader research community while influencing long-term product direction.

What You’ll Do

• Conduct original research in machine learning and AI, with a focus on large-scale foundation models, generative AI, and post-training methods, including reinforcement learning.
• Develop novel methodologies, models, and evaluation frameworks to advance personalization systems.
• Design and execute rigorous experiments to explore new ideas and validate research hypotheses.
• Contribute to the scientific community through publications, talks, and conference participation.
• Collaborate with cross-functional partners to translate research insights into long-term product opportunities.
• Help define and evolve a forward-looking research agenda aligned with Spotify’s personalization strategy.
• Mentor others and contribute to a strong, curious, and collaborative research culture.

Who You Are

• You have a Master’s or PhD in machine learning, AI, or a related field, or equivalent research experience.
• You have demonstrated expertise in machine learning and artificial intelligence through peer-reviewed publications at conferences such as NeurIPS, ICLR, ICML, KDD, or RecSys.
• You have deep knowledge of machine learning, with hands-on experience in areas such as post-training and reinforcement learning for large models, reward design, large-scale distributed training, or evaluation of model behavior.
• You are experienced in designing experiments and working with real-world datasets to validate research ideas.
• You care about advancing understanding of user behavior and improving experiences across music and talk content.
• You bring curiosity, creativity, and a thoughtful approach to solving complex, open-ended problems.
• You value collaboration and actively seek diverse perspectives in your work.

Where You’ll Be

• This role is based in London.
• We offer you the flexibility to work where you work best! There will be some in person meetings, but still allows for flexibility to work from home.

Learn about life at Spotify

Spotify is an equal opportunity employer. You are welcome at Spotify for who you are, no matter where you come from, what you look like, or what’s playing in your headphones. Our platform is for everyone, and so is our workplace. The more voices we have represented and amplified in our business, the more we will all thrive, contribute, and be forward-thinking! So bring us your personal experience, your perspectives, and your background. It’s in our differences that we will find the power to keep revolutionizing the way the world listens.

At Spotify, we are passionate about inclusivity and making sure our entire recruitment process is accessible to everyone. We have ways to request reasonable accommodations during the interview process and help assist in what you need. If you need accommodations at any stage of the application or interview process, please let us know - we’re here to support you in any way we can.

Extensive learning opportunities, through our dedicated team, GreenHouse.

Flexible share incentives letting you choose how you share in our success.

Global parental leave, six months off - for all new parents.

All The Feels, our employee assistance program and self-care hub.

Flexible public holidays, swap days off according to your values and beliefs.