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Head of Data Science

Job in Greater London, London, Greater London, W1B, England, UK
Listing for: Propel
Full Time position
Listed on 2026-02-28
Job specializations:
  • IT/Tech
    AI Engineer, Machine Learning/ ML Engineer, Data Science Manager, Data Analyst
Job Description & How to Apply Below
Location: Greater London

🚀 The Future of Fashion Discovery

As a female-founded startup at an exciting inflection point, we’re shaping something genuinely game-changing. This isn’t just a product. It’s a movement. And we’re looking for a brilliant Head of Data Science to help lead the charge.

You’ll own and build the intelligence at the heart of the platform — personally designing, building, deploying and iterating on production AI systems while shaping long-term data and AI strategy.

You’ll work shoulder-to-shoulder with founders, product and engineering to decide:

  • What to build
  • What not to build
  • When “good enough” is the right answer
What You’ll Own
  • Personally design, build and deploy production computer vision and agentic AI systems powering search, discovery, recommendations and personalisation
  • Make pragmatic trade-offs between speed, quality and technical elegance
  • Translate messy user problems into clear, testable interventions
  • Partner deeply with Product to optimise for trust, confidence and discovery — not just offline metrics
  • Focus relentlessly on feature value and ROI
  • Work hands-on with imperfect datasets
  • Design annotation strategies, quality checks and evaluation frameworks from scratch
  • Decide where data investment matters — and where it doesn’t (yet)
  • Build scalable but lightweight pipelines (AWS)
  • Ensure models are robust, reliable, explainable where needed and safe in production
  • Set a strong technical and ethical bar for data science
  • Mentor future hires as the team grows
  • Model curiosity, humility and ownership in high ambiguity
  • Proactively address bias, representation and fairness in AI systems
  • Align technical decisions with company values around individuality and body confidence
  • Speak up when technical direction risks user trust
  • Evaluate and drive adoption of AI productivity tools across Product & Engineering
  • Embed AI-assisted development into day-to-day workflows
  • Define standards that let us move fast — without building tech debt mountains
Must-Haves
  • 3–5 years in a technical leadership role
  • Proven track record delivering AI/ML products from inception to production
  • Deep hands-on expertise in at least one core ML domain (strong preference for computer vision and/or generative AI
    )
  • Experience with LLMs, conversational AI and evaluation of generative systems
  • Strong MLOps and engineering mindset
  • Hands-on with AWS, Python, SQL and modern ML tooling
  • Strong data engineering and annotation strategy experience
  • Experience leading teams and working with senior stakeholders
  • Comfortable in fast-moving, evolving environments
  • Simplicity mindset: start simple, add complexity only when necessary
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