Senior Machine Learning Scientist (Generative AI) - Viator

Senior Machine Learning Scientist (Generative AI) - Viator. Viator, a Tripadvisor company, is the leading marketplace for travel experiences. We believe that making memories is what travel is all about. And with 300,000+ travel experiences to explore—everything from simple tours to extreme adventures (and all the niche, interesting stuff in between)—making memories that will last a lifetime has never been easier. With industry-leading flexibility and last-minute availability, it\'s never too late to make any day extraordinary. Viator. One app, 300,000+ travel experiences you’ll remember.

This role is remote or hybrid (UK, Poland, or Portugal) with occasional travel to company offices as necessary.

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• Research, prototype, and productionize generative AI models.
  
• Develop scalable GenAI pipelines that generate high-quality content, from product descriptions, reviews, titles, and other product content.
  
• Design and evaluate prompt tuning strategies and RAG systems to ensure factual and engaging outputs.
  
• Fine-tune foundation models and develop domain-specific adapters using techniques like LoRA, PEFT, and instruction tuning.
  
• Define best practices for model monitoring, including output quality, hallucination detection, and user feedback loops.
  
• Understand use cases for Agentic AI and communicate findings with the wider ML team and product.
  
• Utilize RLHF methodologies to build feedback mechanisms that shape the behavior and quality of our generative AI outputs.
  
• Collaborate cross-functionally with product, design, and engineering to integrate models into user-facing applications.
  
• Stay up to date with the latest in GenAI research and help shape internal best practices.
  
• Design, code, experiment, and implement models and algorithms to enhance customer satisfaction, increase supplier value, optimize business results, and ensure infrastructure efficiency.
  
• Collaborate with product managers and business stakeholders to ensure top-quality outcomes to meet internal objectives.
  
• Investigate and adopt innovative concepts that offer tangible benefits.
  

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• 5+ years of hands-on data science experience with at least 2 years of experience with LLMs.
  
• Awareness of current LLM techniques, prompt tuning, evaluations, and model monitoring.
  
• In-depth knowledge of AI/ML/DL, Statistics, and related open-source libraries.
  
• Strong skills in SQL and at least one programming language.
  
• Comfort with code reviews, discussing architecture, and collaborating with a multidisciplinary team for regular model deployments.
  
• Experience deploying online solutions and analyzing real-time results through A/B testing.
  
• Passion for mentoring junior team members and helping the team perform at its best.
  
• Leadership qualities, autonomy, and strong collaboration skills.
  
• Clear communication, audience awareness, and proactive sharing of findings; able to communicate complex ideas across the business simply and effectively.
  

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• Master\'s or PhD in Computer Science, Operations Research, Statistics, or related quantitative disciplines.
  
• Knowledge in User Modelling, Representation Learning, Recsys, Large Language Models (LLMs).
  
• Prior experience in e-commerce or an Online Travel Agency.
  

This role is remote or hybrid in the UK, Poland or Portugal. Occasional travel to company offices as necessary.

If you need a reasonable accommodation or support during the application or recruiting process due to a medical condition or disability, please reach out to your recruiter or email with the job requisition number.

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• We aspire to lead. Tap into your talent, ambition, and knowledge to bring us – and you – to new heights.
  
• We\'re relentlessly curious. We push beyond the usual, the known, the “that\'s just how it\'s done.”
  
• We\'re better together. We learn from, accept, respect, support, and value one another and are creating something remarkable in the process.
  
• We serve our customers, always. We listen, question, respond, and strive for wow moments.
  
• We strive for better, not perfect. We won\'t get it right the first time; we\'ll provide a safe environment to make mistakes, iterate, improve, and grow.
  
• Our workplace is for everyone, as is our people-powered platform. Bring your unique identities, abilities, and experiences so we can revolutionize travel together.
  

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