poolside is hiring for a

Member of Engineering, Reinforcement Learning

Full-time, indefinite contract
Remote EMEA/East Coast or Paris
Apply for this role

About poolside

poolside is pursuing AGI. Only very few companies in the world are able to be in this race - we’re early in our journey which makes it a great time to join the team but we also have scale-up+ needs when it comes to product and engineering. We can tell you why over the phone...

About our team

We are a remote-first team that sits across Europe and North America. We come together once a month in-person for 3 days, always Monday-Wednesday. We also do longer off-sites twice a year.

Our team is a combination of more research and more engineering-oriented profiles, however, everyone deeply cares about the quality of the systems we build and has a strong underlying knowledge of software development. We believe that good engineering leads to faster development iterations, which allows us to compound our efforts.

About the role

You would be working on our reinforcement learning team focused on improving reasoning and coding abilities of Large Language Models through reinforcement learning. This is a hands-on role where you'll work end-to-end from researching new exploration or training algorithms, to designing and scaling up RL environments, to implementing your ideas across the stack. You will have access to thousands of GPUs in this team.

Your mission

To push the frontier of reasoning and coding capabilities of foundational models.


  • Research and experiment on ways to improve reasoning and code generation for LLMs. Own the full experiment life cycle from idea to experimentation and integration.
  • Keep up with latest research, and be familiar with state of the art in LLMs, RL, and code generation.
  • Design, analyze, and iterate on training/fine-tuning/data generation experiments.
  • Write high-quality, pragmatic code.
  • Work in the team: plan future steps, discuss, and always stay in touch.

Skills & Experience

  • Experience with Large Language Models (LLM)
    • Deep knowledge of Transformers is a must
    • Strong deep learning fundamentals
    • Trained and fine-tuned LLMs from scratch
    • Extensively used and probed LLMs, familiarity of their capabilities and limitations
    • Knowledge/Experience of distributed training
  • Strong machine learning and engineering background
  • Research experience
    • Experience in proposing and evaluating novel research ideas
    • Familiar with, or contributed to the state of the art in at least one of the topics: LLMs, reinforcement learning, source code generation, continual learning
    • Is comfortable in a rapidly iterating environment
    • Is reasonably opinionated
    • Recent academic publications are nice to have
  • Programming experience
    • Linux
    • Strong algorithmic skills
    • Python with PyTorch or Jax
    • Use modern tools and are always looking to improve
    • Strong critical thinking and ability to question code quality policies when applicable
    • Prior experience in non-ML programming, especially not in Python - is a nice to have


  • Intro call with one of our Founding Engineers
  • Technical Interview(s) with one of our Founding Engineers
  • Team-fit call with Beatriz, our Head of People
  • Meet & greet call with Eiso, our CTO & Co-Founder


  • Fully remote work & flexible hours;
  • 37 days/year of vacation & holidays;
  • Health insurance allowance for you and dependents;
  • Company-provided equipment;
  • Wellbeing, always-be-learning and home office allowances;
  • Frequent team get togethers in Paris;
  • Great diverse & inclusive people-first culture.
Full-time, indefinite contract
Remote EMEA/East Coast or Paris
Apply for this role