Senior Data Scientist - Hertfordshire

Are you a passionate data scientist ready to take your career to the next level? As Senior Data Scientist, you'll lead the way in delivering cutting‑edge analytical solutions that unlock real business value. You'll set the technical standards, make key architectural decisions, and guide the team in building advanced machine learning and statistical models that make a difference. Reporting to the Head of Engineering for Data, you'll mentor and inspire fellow data scientists, sharing your expertise to elevate the whole team. This role perfectly blends deep technical skill with strategic impact‑transforming complex business challenges into innovative, practical data science solutions.

• 
  
• Making technical decisions that ensure quality, scalability, and maintainability of all data science solutions.
  
• Leading architectural design, technology selection, and approving methodologies and technical standards.
  
• Guiding and supporting data scientists through complex technical challenges and reviewing their approaches.
  
• Balancing trade‑offs between innovation, delivery speed, and technical robustness in decision‑making.
  
• Influencing the technical direction of projects, developing team capabilities, and ensuring long‑term sustainability of solutions.
  

Deep expertise in the data science lifecycle, machine learning methodologies, and production deployment, with 5‑7+ years of hands‑on experience.

• 
  
• Strong knowledge of cross‑functional collaboration, working effectively with product, engineering, analytics, and business stakeholders.
  
• Expert proficiency in Python, advanced machine learning, statistical modeling, software engineering best practices, and SQL with experience in large‑scale systems like Snowflake.
  
• Strategic problem‑solving and technical architecture skills to design scalable, maintainable solutions while setting technical direction and standards.
  
• Proven leadership through technical guidance, mentorship, code reviews, and knowledge sharing, driving team capability without direct line management responsibilities.
  

We're part of an award‑winning Bourne Leisure family, which includes Haven Warner Hotels. We have 9,000 fantastic team members and 39 beautiful seaside locations and our HQ based in Hemel Hempstead.

Our people and the teams they form are the backbone of a professional experience with us. At Haven, we take pride in our Breath of Fresh Air culture, which focuses on valuing and supporting every team member. We prioritise openness and transparency in our interactions allowing our team members to be their authentic selves.

We operate a hybrid working model, meaning 50% of your working week will be spent at the office, occasionally on Park, or at external events.

The interview process will be up to 3 stages and may contain a presentation or skills test, depending on the role. Please reach out if you need additional support or specific arrangements to enable you to perform to the fullest during this process.

Diversity, equity, and inclusion are at the heart of who we are and what we do. Our commitment to these values is unwavering and they are central to our mission. We encourage applications from all backgrounds, communities and industries and we are ready to discuss any reasonable adjustments or flexibility that you may require, including whether a role can be part‑time or a job‑share.

• 
  
• Annual bonus
  
• 20% discount on both Haven and Warner Hotels holiday for you, family and friends
  
• Comprehensive wellbeing supportAccess to the Bourne Leisure corporate box at the O2 Arena, London
  
• Exclusive discounts with corporate partners
  
• Exciting career pathways, including Learning and Development opportunities such as Apprenticeships and Degrees
  
• Enhanced family friendly policies and pay (eligibility criteria applied)