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Chattermill

Turn customer feedback from every channel into insights that drive better products, greater retention, and deep loyalty.

Senior Machine Learning Scientist

Machine Learning EngineerMachine Learning EngineerFull TimeRemoteSeniorTeam 51-200Since 2015H1B No SponsorCompany SiteLinkedIn

Location

United Kingdom

Posted

49 days ago

Salary

0

Seniority

Senior

Postgraduate DegreeEnglishPyTorch

Job Description

Senior Machine Learning Scientist

Chattermill

• Train, evaluate, and iterate on ML models and agentic systems for customer feedback, including owning our custom fine-tuning pipelines. Run experiments end-to-end, track results rigorously, and make clear recommendations on what to ship, iterate, or retire. • Build and maintain LLM-powered features: retrieval pipelines, reranking systems, insight agents, data mining agents, and automated taxonomy generation. • Design and run robust evaluation frameworks: build test sets, define metrics, evaluate non-deterministic systems, handle class imbalance, and automate checkpoint comparisons. • Improve and extend semantic search and retrieval, evolving from embedding-based approaches toward more advanced methods. • Write production-quality code and collaborate closely with Engineering on productionisation, model serving, data pipelines, and monitoring. • Work with Product and Commercial teams to translate business needs into practical ML solutions, and support client evaluations and accuracy benchmarking. • Mentor team members, review code and research, and bring relevant advances from the literature into the product.

Job Requirements

  • A deep working knowledge of transformer architectures.
  • Strong PyTorch skills, with the ability to write custom training loops, modify model architectures, and debug issues at the tensor level. Ideally, experience with parameter-efficient fine-tuning techniques such as LoRA
  • Extensive experience working with large-scale, messy real-world text data, including classification, extraction, embeddings, re-rankers, clustering, and search.
  • Experience in instruction fine-tuning and serving language models, familiarity with frameworks such as vLLM, DeepSpeed, or similar tools
  • A solid grounding in classical ML and statistics, and the judgement to choose simpler methods when they’re the right solution.
  • Practical experience building with GenAI and agentic patterns.
  • Excellent communication skills and confidence translating complex technical concepts for non-technical audiences (and vice versa!).
  • Technical curiosity and a keen interest in AI – a love of experimenting to make the most of available technology.
  • High ownership and initiative, with the ability to identify problems, prioritise effectively, and drive solutions forward.

Benefits

  • Monthly Health & Wellness budget, increasing with length of service
  • Annual Learning and Development budget, increasing with length of service
  • Flexible working in a choice-first environment - we trust the way you want to work!
  • Work From Home Allowance
  • 25 Holiday Days + your local bank holidays, plus an extra day for every year of service
  • Your birthday off
  • Enhanced Family Leave (UK Only), Fertility Leave, and Neonatal Leave
  • Optional Healthcare Plan
  • Life & income protection (Location dependent)
  • Employee Assistance Programme (UK Only)
  • The opportunity to share in the company’s success through options
  • If you’re in London, a dog-friendly office with great classes, events, and a rooftop terrace

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