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FLFlexion Robotics

Robotics Engineer - Modeling & Sim-to-Real Transfer(m/w/x)

Zürich
Full-timeOn-siteExperienced

Modeling and system identification for humanoid robots, characterizing physical hardware. Multi-body dynamics and C++/Python coding skills required. Energetic team, competitive compensation.

Requirements

  • MSc or PhD in Robotics, Mechanical Engineering, Electrical Engineering, or equivalent experience
  • Strong background in multi-body dynamics, numerical methods, and robot physics
  • Proven experience in system modeling and identification for physical systems
  • Strong coding skills in C++ and Python
  • Hands-on experience with modern simulators (e.g., Isaac Lab/Gym, MuJoCo, Drake)
  • Hands-on experience with real robotic hardware, experiments, and system-level debugging
  • Deep knowledge of actuator dynamics (BLDC motors, gearboxes, friction models)
  • Deep knowledge of sensor modeling (IMUs, LiDARs, cameras)
  • Familiarity with Reinforcement Learning
  • Experience with robot description formats (URDF, SDF, USD)

Tasks

  • Model in-house and customer robots accurately
  • Perform system identification for robots
  • Characterize physical hardware sensors
  • Characterize physical hardware drivetrains
  • Characterize physical hardware contact dynamics
  • Replicate robot behaviors in simulation
  • Evaluate the sim-to-real gap
  • Develop mathematical models for physical subsystems
  • Model drivetrain behavior
  • Model sensor behavior
  • Model network behavior (latency, jitter)
  • Design experiments to collect robot data
  • Execute experiments to collect robot data
  • Identify physical parameters using robot data
  • Identify friction coefficients
  • Identify inertial parameters
  • Identify noise parameters
  • Identify latency parameters
  • Implement models into simulation infrastructure
  • Benchmark simulation performance against real-world logs
  • Quantify the Sim-to-Real gap
  • Minimize the Sim-to-Real gap
  • Collaborate with control teams
  • Collaborate with perception teams
  • Collaborate with hardware teams

Work Experience

  • approx. 1 - 4 years

Education

  • Master's degree

Languages

  • EnglishBusiness Fluent

Tools & Technologies

  • C++
  • Python
  • Isaac Lab/Gym
  • MuJoCo
  • Drake
  • URDF
  • SDF
  • USD

Benefits

Competitive Pay

  • Competitive compensation

Informal Culture

  • Energetic, collaborative team
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