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Machine Learning Scientist

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About Tripadvisor
The Tripadvisor Group is a global leader in the travel industry, dedicated to connecting people with memorable experiences and trusted travel guidance. Our mission is to be the world's most reliable source for travel-related content, enabling travelers to make informed decisions and discover new destinations. We leverage our extensive portfolio of brands, innovative technology, and rich content to serve a diverse audience worldwide. Our core offerings include travel reviews, booking services, and curated experiences across various categories such as accommodations, restaurants, tours, and activities. As part of Tripadvisor, Inc. (Nasdaq: TRIP), we operate several prominent brands including Tripadvisor, Viator, and TheFork, each contributing to our goal of enriching the travel experience for millions of users every day.
About The Role
We are seeking a highly experienced Principal Machine Learning Scientist to join our team in London, United Kingdom. In this pivotal role, you will serve as the technical leader responsible for our core discovery engine, which influences how millions of users search, discover, and organize complex travel itineraries. You will spearhead the development and execution of machine learning strategies that directly impact key business metrics such as user engagement and booking conversion. The ideal candidate will possess a deep expertise in AI research and production-grade engineering, capable of translating innovative algorithms into scalable systems. You will work at the intersection of advanced research and practical application, addressing complex challenges involving multi-task ranking, sequential user modeling, and graph-based recommendations. Mentoring a team of talented scientists and collaborating closely with cross-functional partners will be integral to your success in this role. If you are passionate about building state-of-the-art AI systems and leading technical initiatives that shape the future of travel technology, this role offers a unique opportunity to make a significant impact.
Reasons to use Rodeo
I’m in my final year doing Economics and I don’t know whether to apply for grad schemes now or do a masters first. What do you think?
Honest answer — it depends on where you want to end up. A lot of top grad schemes (Big 4, civil service, banking) don’t need a masters. Let’s look at the ones you’d be competitive for now, and we can decide if a masters actually adds anything.
Also worth knowing: most autumn 2026 applications are open now. Timing matters more than you think.
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Graduate Consultant — 2026 Scheme
Why you're a good match
StrongYour economics background and your summer at a regional bank line up with what PwC looks for on the consulting scheme. Applications close in four weeks.
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Why you're a good match
You’ve got the grades and the economics background, and your bank internship is exactly the experience this scheme looks for. Apply soon — deadlines close within the month.
Experience fit
Your summer at the bank plus your econometrics coursework map directly to the day-one responsibilities on this scheme — client modelling, market briefings, and deal support.
Only hits
No noise. No "maybe this fits." Just roles with a clear explanation of why they're right — and where to focus when applying.
Qualifications
- Ph.D. or Master’s degree in Computer Science, Machine Learning, Statistics, or a highly quantitative field.
- Minimum of 8 years of industry experience developing and deploying large-scale machine learning models in production environments.
- Proven track record of delivering ML systems at the scale of millions of active users.
- Deep expertise in state-of-the-art retrieval and ranking algorithms, including multi-task learning, MMoE architectures, and multi-objective optimization.
- Hands-on experience with sequential and temporal modeling for recommendation systems.
- Strong understanding of advanced representation learning, embedding generation, and multi-modal data integration.
- Proficiency in Python and deep learning frameworks such as TensorFlow and PyTorch.
- Experience with distributed computing frameworks like Spark and Ray, and cloud platforms including AWS or GCP.
- Knowledge of Graph Neural Networks, knowledge graphs, and graph embeddings for complex relational data.
- Familiarity with Agentic AI, Large Language Models, and autonomous planning agents for conversational search and automated itinerary generation.
- Experience working within travel tech, e-commerce, or two-sided marketplaces, especially with non-linear user journeys and constrained inventories.
- Strong publication record or contributions to open-source ML projects in top-tier AI and IR conferences such as SIGIR, KDD, RecSys, or NeurIPS.
Responsibilities
- Lead the technical strategy and execution for search, retrieval, ranking, and recommendation systems within the Trips vertical.
- Translate high-level business objectives into scalable machine learning architectures and production systems.
- Design, prototype, and scale innovative recommendation and ranking models that address complex travel-related challenges.
- Oversee the deployment of low-latency, high-throughput pipelines capable of processing billions of data points in real-time.
- Collaborate with Product Managers, Engineering Leads, and Data Scientists to optimize multiple business objectives simultaneously.
- Act as the primary technical authority for ML initiatives, ensuring best practices and technical excellence.
- Mentor and develop senior and mid-level ML scientists, fostering a culture of innovation, rigor, and continuous learning.
- Drive research efforts, publish findings, and contribute to the broader AI community through conferences and open-source projects.
- Ensure data privacy, security, and ethical considerations are integrated into all ML systems and practices.


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Benefits
- Competitive salary packages with annual bonuses, benchmarked against industry standards.
- Flexible work arrangements including remote work options and on-site collaboration as needed.
- Generous annual benefits for personal development, including tuition assistance and lifestyle allowances.
- Travel discounts and perks to support personal travel and exploration.
- Comprehensive health insurance coverage and wellness programs.
- Employee assistance programs to support mental health and well-being.
- Matching charitable donations to support community engagement and social responsibility.
- Referral bonuses for successful recruitment of new team members.
Equal Opportunity
Tripadvisor is committed to creating an inclusive environment where all individuals are valued and respected. We are an equal opportunity employer and do not discriminate based on race, ethnicity, gender, age, disability, sexual orientation, or any other protected characteristic. We believe diversity drives innovation and excellence, and we welcome applicants from all backgrounds to join our team. We look forward to welcoming diverse talent to help us achieve our mission of enriching travel experiences worldwide.
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