{"id":3852314,"url":"https://alion.io/job/plusai-principal-engineer-mapping-and-localization","title":"Principal Engineer, Mapping and Localization","company":{"id":22363,"name":"PlusAI","domain":"plus.ai","url":"https://alion.io/company/plus","size_band":"201-500","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Lever","truth_index":{"grade":"B","score":73,"open_postings":43,"ghost_share":0.442,"stale_share":0,"repost_share":0,"time_to_fill_p50_days":51,"computed_at":"2026-11-07T05:47:08Z"}},"role":"Marketing","role_family":"Marketing","seniority":"lead","employment_type":"full_time","work_mode":"hybrid","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Santa Clara, United States"],"countries":["US"],"hiring_countries":[],"hiring_countries_total":0,"salary":{"min":200000,"max":240000,"currency":"USD","period":"year","gross":null,"usd_annual":240000},"salary_estimate":null,"experience_years_min":7,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"C++","optional":false},{"name":"Eigen","optional":false},{"name":"GTSAM","optional":false},{"name":"OpenCV","optional":false},{"name":"Sensor Fusion","optional":false},{"name":"SLAM","optional":false},{"name":"CUDA","optional":true},{"name":"LOAM","optional":true},{"name":"ORB-SLAM3","optional":true}],"status":"live","first_seen_at":"2026-01-13T20:15:56Z","employer_posted_date":"2026-01-13","last_verified_at":"2026-11-08T03:12:38Z","board_verified":true,"closed_at":null,"days_open":298,"trust":{"level":"ghost","repost_count":0,"flags":["stale","company_stale"],"days_open":297},"description":"As a Principal Engineer on our Mapping and Localization team, you will design and implement high-fidelity fusion algorithms that combine LiDAR, Radar, Camera, IMU, and GNSS data with HD Maps to achieve centimeter-level accuracy. You will tackle the hardest edge cases-from GPS-denied tunnels to dynamic construction zones-ensuring our vehicles operate safely in complex L4 ODDs (Operational Design Domains).\nResponsibilities:\nLead the design and evolution of our localization architecture, making critical build-vs-buy decisions and defining long-term technical roadmaps.\nDesign and implement robust, real-time algorithms for sensor fusion, visual/LiDAR odometry, and global localization using techniques like Factor Graphs, EKF/UKF, and particle filters.\nDevelop pipelines to generate, maintain, and query High-Definition (HD) maps.\nWork on \"priors-based\" localization and semantic map matching.\nSolve the \"stale map\" problem by designing systems for change detection. You will use fleet data to identify construction zones, lane shifts, or new signage and update the map in near real-time. Maintain and continuously update large-scale LiDAR-based HD maps to support autonomous driving systems.\nOptimize code for embedded compute constraints (latency, memory, and power) without sacrificing safety or accuracy.\nProvide self diagnosis capability for localization\nAct as a technical mentor to senior and junior engineers, conducting rigorous code reviews and fostering a culture of engineering excellence.\nRequired Skills:\nM.S. or Ph.D. in Robotics, Computer Science, Electrical Engineering, or a related field.\n7+ years of industry experience in robotics, with at least 4 years dedicated to production-level localization or mapping systems.\nExpert-level Modern C++ (14/17/20) skills, with a deep understanding of memory management, multi-threading, and real-time systems.\nStrong theoretical foundation in probabilistic robotics, including Kalman Filtering (EKF, UKF), nonlinear optimization (Ceres, g2o, GTSAM), and SLAM.\nDeep understanding of 3D geometry, linear algebra, and 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