About the role
At Mentee Robotics, we are redefining humanoid automation with an AI-first approach - combining perception, reasoning, and dexterous manipulation into fully autonomous systems that continuously learn and improve. We offer an exceptional opportunity to participate in building next-generation commercial humanoid robots from 0 to 1, alongside competitive compensation, and an international engineering environment. We are expanding with a new robotics Engineering Center in China, working hand-in-hand with our engineering teams in headquarters. Its mission: to rapidly develop our next-generation full-size humanoid platform and bring it to production.
We are looking for a Sensor Calibration Engineer to own intrinsic and extrinsic calibration algorithms, online self-recalibration routines, software calibration pipelines, and spatial-temporal alignment for our humanoid robot’s multi-modal sensor suite (cameras, LiDAR, IMU, kinematics, and force-torque sensors).
Who you are: • Calibration specialist deeply versed in 3D geometry, spatial transformations, state estimation, non-linear optimization, and sensor error modeling. • Hands-on engineer who excels at mathematical model formulation, algorithmic solver design, and numerical optimization. • Driven to translate complex calibration formulations into automated software routines and online self-correcting algorithms. • A strong collaborator across computer vision, SLAM, state estimation, control, and production quality teams.
Responsibilities: • Design and implement intrinsic and extrinsic calibration algorithms for multi-camera systems, LiDAR, IMU, joint encoders, and force/torque sensors. • Develop joint spatial-temporal calibration pipelines to accurately estimate inter-sensor rotation/translation matrices and temporal offsets. • Architect automated calibration software pipelines and trajectory generation algorithms to support scalable sensor calibration workflows. • Implement online self-calibration and drift-tracking algorithms to maintain cross-sensor spatial alignment during continuous dynamic motion. • Integrate kinematic-visual-inertial calibration algorithms to model structural compliance, thermal expansion, and gravity deflection. • Deliver calibrated transformations (TF trees, extrinsic matrices, distortion parameters) directly into perception, localization, and control stacks. • Conduct residual error sensitivity analysis, repeatability validation, and environmental robustness testing across thermal cycles and dynamic vibration.
Requirements: • B.Sc. or M.Sc. in Computer Science, Robotics, or related technical disciplines. • 3+ years of hands-on experience in multi-sensor calibration, computer vision geometry, spatial optimization, or SLAM/state estimation. • Solid mathematical foundation in 3D rigid-body transformations, Lie algebra (SE(3), SO(3)), non-linear optimization (Ceres, g2o), and Kalman filtering. • Proficient in Modern C++ and Python, with experience utilizing OpenCV, PCL, and ROS 2 coordinate transformation tools (TF2). • Practical experience in camera intrinsic/extrinsic calibration, camera-LiDAR calibration, and camera-IMU spatiotemporal calibration (e.g., Kalibr). • Experience developing automated calibration software workflows and verification tools. • Strong analytical problem-solving skills and rigorous data-driven evaluation methodologies.
Advantages: • Direct experience in humanoid or quadruped kinematic-visual-inertial self-calibration routines. • Knowledge of thermal error modeling for IMU gyroscopes/accelerometers and optical sensor distortion. • Comfortable communicating technical topics in English with international teams.
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