🧰 What you’ll need:

• A solid working knowledge of transformer architectures and how they are applied in NLP tasks.
• Proficiency in PyTorch, including training loops and standard model fine-tuning workflows; exposure to parameter-efficient techniques such as LoRA is a plus.
• Experience working with real-world text data across tasks such as classification, extraction, embeddings, or search — at a meaningful scale.
• Some exposure to instruction fine-tuning or model serving, with an interest in going deeper.
• A grounding in classical ML and statistics, and the instinct to reach for simpler methods when warranted.
• Familiarity with GenAI and agentic patterns, even if hands-on production experience is still developing.
• Clear communication skills and the ability to explain technical work to colleagues across functions.
• Genuine curiosity about AI and a habit of experimenting — you learn by doing.
• Good ownership instincts: you follow problems through rather than passing them on.

➕ It would be a bonus if you:

• MSc in Computer Science, Machine Learning, AI, Data Science, Computational Linguistics, or a closely related STEM field.

🔎 Our Hiring Process

1. Let’s introduce ourselves – you’ll complete an introductory asynchronous interview - we’d love to learn more about you, your ambitions, and what you’re looking for in your next step.
2. Get to know your would-be manager – you’ll have a call with Aji, our Chief Scientist, to learn more about the role and show off your experience.
3. Show us how you work – you'll complete a short take home assignment
4. Get to know your would-be team – You'll meet a mix of people who you'll be working closely with from the Data Science, Engineering and Product teams.
5. How our values and your career goals align – you’ll have a call with our cofounder to learn more about life at Chattermill and ensure we’re the right place for your next stage of growth.

Our Perks

• Flexibility & Work Setup: Flexible working in a choice-first environment - we trust the way you want to work! Work-from-home allowance to set up your ideal workspace
• Time Off: 25 days holiday + local bank holidays, plus an extra day for each year of service. Your birthday off
• Growth & Ownership: Annual learning & development budget to support your growth (increasing over time). Equity options — share in the company’s success
• Health & Wellbeing: Monthly health & wellbeing budget, increasing with length of service. Optional private healthcare plan. Life assurance & income protection (location dependent). Employee Assistance Programme (location dependent) for extra support when you need it. Enhanced family leave (location dependent), plus fertility and neonatal leave
• Office Perks: If you’re in London, a dog-friendly office with great classes, events, and a rooftop terrace