Senior Machine Learning Scientist at Chattermill Analytics Limited

Jack & Jill; Greater London; Hybrid; GBP 90,000 - 150,000; Full time

Job summary

Chattermill Analytics Limited in London remote Europe is seeking a Senior Machine Learning Scientist to own the end-to-end NLP pipeline, from training and fine-tuning transformer models to deploying production-ready agentic systems. This role is ideal for a scientist who wants to tackle complex text-analysis challenges with bespoke, high-performance solutions.

You will work on a proprietary ML stack for extracting insights from messy customer feedback, collaborating in a senior environment with

Qualifications

• MSc or PhD in ML/CS or related STEM field.
• Strong PyTorch skills and production-grade model debugging.
• Experience with large-scale generative AI and agentic systems.

Responsibilities

• Train, evaluate, and iterate on custom LLMs and transformers.
• Build retrieval and data mining pipelines for large-scale feedback.
• Design evaluation frameworks and ship production-ready code.

Skills

Transformer architectures

PyTorch

LoRA / PEFT

NLP model deployment

Research & experimentation

Education

MSc/PhD in ML/CS or related STEM field

Tools

vLLM

DeepSpeed

PEFT

Job description

Job Title

Senior Machine Learning Scientist

Salary

Not Disclosed

Company Description

Chattermill Analytics Limited is a Series B funded, AI-native customer experience intelligence platform based in London. They build proprietary NLP models that help global brands process and understand messy, real-world customer feedback at scale, moving beyond simple API wrapping to develop truly custom machine learning architectures and agentic systems.

Job Description

Join a small, senior team to build and ship the next generation of NLP models. You will own the end-to-end pipeline, from training and fine-tuning custom transformer models to deploying production-ready agentic systems. This role is perfect for a scientist who wants to solve complex text-analysis problems using bespoke, high-performance solutions.

Location

Remote, Europe

Why this role is remarkable

• Work on a proprietary ML stack involving extraction, retrieval, and summarization rather than just wrapping third-party APIs or basic LLM prompts.
• Join a high-performing Series B company where you have direct ownership over significant parts of the model pipeline and immediate product impact.
• Collaborate in an elite, senior environment with direct mentorship opportunities while exploring cutting-edge agentic and RAG architectures for customer intelligence.

What You Will Do

• Train, evaluate, and iterate on custom LLMs and transformer architectures using PyTorch, custom training loops, and parameter-efficient fine-tuning like LoRA.
• Build and maintain advanced retrieval pipelines, reranking systems, and data mining agents to extract insights from large-scale, messy customer feedback.
• Design robust evaluation frameworks and metrics to benchmark non-deterministic systems and automate model comparisons before shipping production-quality code to customers.

The ideal candidate

• Holds an MSc or PhD in Machine Learning, Computer Science, or a related STEM field with deep expertise in modern transformer architectures.
• Possesses strong PyTorch skills, including the ability to write custom training loops and perform tensor-level debugging for production-grade NLP models.
• Has practical experience building and serving large-scale generative AI or agentic systems using frameworks such as vLLM, DeepSpeed, or PEFT techniques.