Software Engineer - Motion & Behavioral Planning

DiDi Labs

$129K — $247K *
Transportation
Less than 5 years of experience
Job Overview by Ladders

Qualifications

  • B.S./M.S. in Computer Science, Robotics, or a related field.
  • Experience in autonomous systems, robotics, or automotive software development.
  • Strong proficiency in C++ for implementing complex, real-time algorithms.
  • Solid understanding of robotics fundamentals including control theory and optimization.
  • Experience in behavioral planning, motion planning, or trajectory ranking.

Responsibilities

  • Design and implement core Behavioral Planning logic for high-level vehicle actions.
  • Develop and optimize motion planning algorithms integrating path and velocity reasoning.
  • Architect and enhance the geometry system for geospatial compliance in paths.
  • Refine the velocity system for creating safe and comfortable velocity profiles.
  • Model complex driving scenarios to support robust behavioral planning.
  • Design cost functions for trajectory ranking focusing on ETAs, comfort, and safety.
  • Conduct analysis, testing, and debugging of motion planning performances.
  • Collaborate with other teams to integrate environmental understanding with vehicle motion.

Benefits

  • Flexible working hours.
  • Collaborative work environment with cross-functional teams.
  • Opportunities for professional development and continued education.
  • Participation in cutting-edge technology development in autonomous vehicles.
Full Job Description
About The RoleWe are seeking a Software Engineer /Sr. Software Engineer to join our team and develop the core decision-making and motion planning systems for our autonomous vehicles. In this role, you will be responsible for creating the algorithms that enable smooth, safe, and intelligent navigation in complex environments. You will tackle challenges across the full motion planning stack, from high-level behavioral reasoning to low-level trajectory optimization.

Responsibilities
  • Design and implement the core Behavioral Planning logic that determines the vehicle's high-level actions (e.g., lane changes, merges, yields, and interactions with other agents).
  • Develop and optimize the motion planning algorithms that execute behavioral decisions, integrating Geometry Reasoning (path) and Speed Reasoning (velocity) into a cohesive trajectory.
  • Architect and enhance the geometry system for generating geometrically feasible and compliant paths.
  • Architect and refine the velocity system for generating context-aware, comfortable, and safe velocity profiles.
  • Model complex driving scenarios and agent interactions to create a robust world model for the behavioral planner.
  • Design different costs for trajectory ranking to trade off ETAs, comfort and safety of the vehicle behaviors.
  • Conduct in-depth analysis, testing, and debugging of the system's performance in various scenarios, leading root cause investigations.
  • Collaborate with Prediction, Perception, and Control teams to ensure a seamless flow from environmental understanding to physical vehicle motion.

Qualifications
  • B.S./M.S. in Computer Science, Robotics, or a related field.
  • Experience in autonomous systems, robotics, or automotive software development.
  • Strong proficiency in C++ for implementing complex, real-time algorithms.
  • Solid understanding of robotics fundamentals, including decision-making, motion planning, control theory, trajectory ranking, search and optimization algorithms etc.
  • Related experience in one or more of the following: behavioral planning, motion planning, behavior and world environment reasoning, trajectory ranking and cost design.

Preferred Qualifications
  • PhD or internship experience related to robotics planning system designs.
  • Knowledge of vehicle dynamics and longitudinal/lateral control systems.
  • Solid understanding of machine learning principles, reinforcement learning and related algorithms.

The base salary range for this position is $129,189-$214,776 for Software Engineer and $148,594-247,038 for Sr. Software Engineer, annually in addition to bonus, equity and benefits. Our salary ranges are determined by role, level, and location. Within the range, individual pay is determined by work location and additional factors, including job-related skills, experience, and relevant education or training.

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