Senior / Staff Applied AI/ML Research Engineer - London - £200,000 - £300,000 + bens + shares. In-Office (5 days, flexibility at Staff level) Series D | 250 Employees | High-Growth AI Company
Senior / Staff Applied AI/ML Research Engineer to join foundational research team at one of the fastest-scaling conversational AI platforms in the market.
Backed by a number of well-known VC's, the company has raised $200M+ and is scaling toward nine-figure revenue by 2026.
This is not an API wrapper role. This is proprietary model development powering 80% of platform traffic.
You'll report to the Research Lead as part of a highly specialised ML team (currently 5, scaling to 10 in the next 6-12 months). This is the only team building foundational models critical to company success.
What You'll Do
* Design and implement state-of-the-art instruction tuning methods
* Fine-tune and deploy LLMs in production environments
* Apply reinforcement learning techniques (SFT, PPO, DPO, GRPO)
* Run hands-on experimentation to outperform closed-source models
* Break down ambiguous research ideas into structured roadmaps
* Optimise open-source LLMs (LoRa, Llama etc.) for enterprise deployment
One hire will focus specifically on voice and speech systems.
Ideal Background
* 5-7+ years in applied AI/ML (exceptional 3+ years considered)
* Deep experience in fine-tuning + reinforcement l...