Principal AI Research Engineer - RL

Reflex Robotics

$130K — $180K *
Consumer Technology
5 - 7 years of experience
Job Overview by Ladders

Qualifications

  • 5-7 years of experience in reinforcement learning (RL) engineering
  • Deep understanding of core RL algorithms (e.g., SAC, DDPG)
  • Proven track record of debugging unstable gradients and tuning hyperparameters
  • Experience contributing to sample-efficient RL algorithms (e.g., DreamerV3, MuZero)
  • Practical experience deploying on-policy RL on real-world hardware

Responsibilities

  • Develop robust robot policies through on-policy reinforcement learning techniques
  • Optimize and tune algorithms to improve performance metrics beyond industry standards
  • Collaborate closely with hardware teams to ensure seamless integration of software and robotic systems
  • Analyze and interpret performance data to enhance the learning capabilities of robots
  • Lead initiatives to create high-quality demonstrations for AI training

Benefits

  • High equity stakes reflecting early-stage startup potential
  • Significant opportunity for career growth and personal impact on the product
  • A chance to work with a team of industry veterans from companies like Boston Dynamics and Tesla
  • Supportive environment fostering innovation and continuous learning
  • Flexibility in workspace and the option for remote collaboration
Full Job Description
We9re looking for stellar on-policy RL engineers to work on creating robust robot policies. We9re still a small team-which means high ownership, high equity, and the chance to shape the product from the ground up. VLAs and other great "base policies" for robotics achieve ~80% success rates, but in real robot deployments, it9s essential to achieve 99.99% success rates. We can9t ask our customers to tolerate our robots packing three socks into a bin instead of four, or swapping shipping labels between two packages-not even once! You should apply for this role if: - You9ve re-implemented core RL algorithms (SAC, DDPG) from scratch and can debug unstable gradients / tune hyperparameters correctly - You9ve made meaningful intellectual contributions to sample-efficient RL algorithms (e.g., DreamerV3 and MuZero) - You9ve shipped on-policy RL on hardware that learns in the real-world (e.g., for quadruped walking or drone racing) You9d be joining a company that already has a solid core business-with working hardware, delighted customers, and profitable unit economics. Reflex is de-risked enough to see the hazy outlines of success, but still small enough that there9s enormous upside up for grabs. This is a rare opportunity to help build a flagship robotics company from the ground up-and to do work that will truly matter, reshaping what people believe is possible in robotics. We love to see the things you9ve worked on. Have a portfolio or insane project you9ve worked on? Share it. We9re looking for people who push past the status quo, are passionate at work and in their own time-we9re looking for people who want to win.

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