Research Scientist (AI/ML)

TL;DR

Research Scientist (AI/ML): Building a real science of post-training for agents and LLM-based systems with an accent on rigorous experimentation, scaling, and evaluation. Focus on implementing algorithm ideas, designing evaluations that answer real questions, and analyzing complex failure modes.

Location: Onsite in London, UK

Company

hirify.global is a team of scientists, engineers, and machine learning experts working to advance the state of the art in artificial intelligence.

What you will do

• Propose and test research hypotheses in post-training and RL for agents/LLMs.
• Implement algorithm ideas and run end-to-end experiments, including setup, execution, analysis, and iteration.
• Design evaluations and ablations that answer real questions and change minds.
• Analyze results carefully, including debugging and failure analysis.
• Communicate clearly through plots, writeups, and paper-ready narratives and figures.
• Collaborate closely with engineering and research partners to keep the team aligned on findings and strategy.

Requirements

• Work format: Onsite in London, UK
• A research track record in ML/RL, demonstrated through publications or high-quality projects.
• Strong implementation ability and comfort working in research codebases.
• Evidence of owning experiments end-to-end, including analysis and interpretation.
• Strong communication skills and a bias toward clarity and honesty regarding results.
• High agency and drive to push projects forward, prioritize effectively, and take initiative.
• PhD in ML preferred, or equivalent practical experience.

Nice to have

• Experience with RL for sequence models, post-training, preference-based learning, or agentic systems.
• Experience with modern research stacks (e.g., JAX/Flax or PyTorch) and scaling experiments.
• Strong experimental taste and good judgment regarding baselines, ablations, and what is worth testing.
• Comfort with scaling, evaluation methodologies, and diagnosing complex failure modes.
• A focus on craft, caring about doing excellent work while maintaining high velocity.

Culture & Benefits

• Contribute to a culture of first-principles thinking, high standards, and direct, constructive feedback.
• Opportunity to advance state-of-the-art AI for widespread public benefit and scientific discovery.
• Committed to equal employment opportunities regardless of sex, race, religion, or belief.
• Accommodation provided for disabilities or additional needs.
• Employment offers are conditional on the results of a background check.