Senior/Staff ML Research Engineer | London
We're hiring a Senior/Staff ML Research Engineer in London for one of the most exciting conversational AI companies in the world.
Backed by $231M from a16z, Accel, and Bain Capital Ventures, and trusted by some of the world's most recognisable enterprise brands — this team is redefining what AI agents can do across chat, email, and voice at massive scale.
🔬 We're hiring a Senior/Staff ML Research Engineer in London for one of the most exciting conversational AI companies in the world.
Backed by $231M from a16z, Accel, and Bain Capital Ventures, and trusted by some of the world's most recognisable enterprise brands — this team is redefining what AI agents can do across chat, email, and voice at massive scale.
🔬 The Role
You'll sit on the core Research team, owning work end-to-end from ambiguous idea through to production — at a scale that impacts millions of users. This isn't prompt engineering. This is frontier ML research shipping to the real world.
What you'll be doing:
- Building models for enterprise customer support tasks that outperform closed-source frontier models
- Fine-tuning and deploying open-source LLMs to drive order-of-magnitude latency reductions across channels
- Designing state-of-the-art methods for instruction tuning and information retrieval
- Breaking down complex research problems into clear, iterative roadmaps
- Writing clean, bug-free ML code that powers production systems at scale
✅ What We're Looking For
- 7+ years in AI/ML engineering or research (5+ for exceptional talent)
- Proven track record shipping ML projects from concept to production
- Deep experience fine-tuning and deploying LLMs in production environments
- Experience with multimodal models
- Strong engineering fundamentals — you write production-quality ML code
💰 Compensation & Benefits
- £200,000 – £300,000 base salary
- Competitive equity
- Medical, dental & vision
- Unlimited PTO
- Daily lunches, dinners & snacks in-office
📍 Location & Logistics
- London — 5 days in-office
- Full-time, permanent
- ⚠️ Visa sponsorship is not available — candidates must have the right to work in the UK
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