Principal Researcher - LLM

JR United Kingdom; Slough; On-site; GBP 80,000 - 120,000; Full time

Job summary

An international tech lab seeks a Principal AI Researcher to enhance their applied AI research center in Dublin. The role involves designing recommender systems, running experiments, and mentoring team members in a dynamic research environment. Ideal candidates possess a PhD and extensive experience in applied machine learning, particularly with recommender systems and LLMs.

Qualifications

• 10+ years of experience in applied ML.
• Strong background in recommender systems or LLMs.
• Multiple publications and patents focused on LLMs.

Responsibilities

• Design and develop production-grade recommender systems.
• Run experiments on massive datasets.
• Mentor junior researchers and guide research direction.

Skills

Python

C++

R

Education

PhD from a top university

Job description

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Principal AI Researcher - Dublin, Ireland
An international tech lab is expanding its applied AI research centre, hiring to strengthen their work on large-scale recommender systems and LLMs powering global platforms across cloud, streaming, and mobile.
This is more than a publication-first role. You’ll be joining a multi-disciplinary research centre that collaborates with top universities and industry partners, with real deployment as the end goal.
What You’ll Do:

• Design and develop production-grade recommender systems and LLM-driven services
• Run experiments on massive datasets, proposing novel approaches to real-world problems
• Present and defend your research both internally and externally
• Mentor junior researchers and guide research direction across the team
• Publish in top-tier venues, file patents, and build working prototypes
• Partner with global stakeholders to scale ideas and deliver impact

What They’re Looking For:

• 10+ years of experience in applied ML, with a strong track record in recommender systems or LLMs
• Hands-on coding skills are a must (Python, C++, R, etc.)
• PhD from a top university and multiple publications + patents all focused around LLM's
• Industry background at leading tech companies (e.g. Apple, Amazon, ByteDance)
• Ability to lead and deliver in research environments that bridge academia and industry

Process Overview:

• Coding test (challenging and mandatory, even for senior profiles)
• Research presentation (typically PhD work or a recent project)
• Deep-dive with the lab or HQ team to assess alignment
• Final HR round (salary and logistics)