Hybrid Applied Machine Learning Engineer

Posted last month

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About the role

  • Build applied ML systems that make our product smarter and more defensible
  • Develop contextual categorisation of web content (e.g. automatically recognising industry categories)
  • Prototype algorithms that can improve advertising outcomes, such as smarter bidding or optimisation logic
  • Work closely with product and commercial teams to package outputs into demos and case studies for clients
  • Collaborate with engineers to integrate ML features into production system
  • Establish good practices for applied ML in the business, bringing your curiosity and drive to help us move fast while building robust foundations
  • Apply modern LLM techniques to business problems:
  • Use prompt-engineering strategies to get consistent, accurate results
  • Explore augmentation methods (e.g. combining LLMs with our own data via embeddings or retrieval)
  • Run fine-tuning experiments to adapt general models to our specific domain

Requirements

  • Ideally, you’ve got 1–3 years experience in applied ML/AI (or equivalent practical experience through academic projects or early career roles)
  • You’re comfortable coding in Python and using ML frameworks (e.g. PyTorch, Hugging Face, scikit-learn)
  • You’ve worked with large language models (LLMs) - not just calling APIs, but experimenting with different ways to get the best out of them:
  • Prompt engineering (designing effective prompts, chaining prompts)
  • Fine-tuning or instruction tuning models for specific tasks
  • Embedding-based augmentation (using vector search to give LLMs access to external knowledge)
  • Retrieval-Augmented Generation (RAG) or similar techniques
  • You’ve taken messy, real-world data and turned it into useful, structured outputs
  • You can show how your work had impact - whether that’s a model in production, a working prototype, or an experiment that unlocked a new direction
  • You’re a clear communicator, able to work across functions with product managers, engineers, and commercial stakeholders
  • You’re excited by the prospect of being our first ML engineer, owning this area from day one and growing into a lead role quickly
  • You don’t need to have worked in adtech before - but if you have, that’s a bonus!

Benefits

  • A flexible, hybrid working setup (we’re usually in the office a few times a week, so being within reach of London Bridge is important)
  • 33 days holiday (inclusive of Bank Holidays), plus additional Christmas shutdown
  • Private Medical Insurance through Vitality
  • Picnic Pension Contribution
  • Inclusive Parental Leave Policy
  • A great co-working space, regular socials & offsites, Picnic Thursdays, Summer Fridays and Work from Roam opportunities

Job title

Applied Machine Learning Engineer

Job type

Experience level

Junior

Salary

Not specified

Degree requirement

No Education Requirement

Location requirements

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