Motional Software Engineer
Interview Guide

Implement a custom matrix class in modern C++ with dynamic resizing, memory-efficient memory alignment, and overloaded accessor operators.

Solve array-based and string manipulation challenges under time constraints while talking through complexity trade-offs (e.g., hashmap lookup efficiency vs. heap-based priority queues for sorting streaming inputs).

Implement a thread-safe bounding box lookup structure or spatial indexing algorithm for fast querying of dynamic obstacles.

Given a series of sensor updates coming in asynchronously, write a function to merge and order the data within a specified time window.

Explain memory management in C++11/14/17, including the internal mechanics of smart pointers (std::unique_ptr, std::shared_ptr), RAII, and strategies to prevent dynamic allocations at runtime inside high-frequency control loops.

Explain the key differences between synchronous and asynchronous message passing across automotive vehicle networks like CAN, CAN FD, and Automotive Ethernet.

Walk through the trade-offs between sampling-based, search-based (e.g., A*, Lattice), and optimization-based (e.g., Model Predictive Control) methods for trajectory generation in urban driving environments.

resource holds resource_id, tenant_id, owner_user_id, title, body_ref, version, status ('draft','active','archived','deleted'), created_at, updated_at, deleted_at, with an index on (tenant_id, status, updated_at DESC, resource_id DESC). The listing endpoint returns active resources for one tenant, newest update first, 50 per page, today with LIMIT 50 OFFSET n. Tenants reach page 400 and rows are created while they read. Write the keyset query, define what the cursor carries and how it is encoded, and say which part of the index each predicate uses. Assume PostgreSQL 16.

outbox_event holds event_id, aggregate_type, aggregate_id, aggregate_version, event_type, payload, status ('pending','published','dead'), attempts, created_at, published_at. A projection is missing rows and you must decide whether the relay skipped events or the consumer dropped them. Write three queries over the last seven days: one listing every aggregate_id whose published aggregate_version sequence has a hole, one giving per-day counts with a running total, and one returning the newest published event per aggregate. For each, say where the window function is evaluated relative to WHERE and LIMIT. PostgreSQL 16.

Design an efficient in-memory cache mechanism that handles fast data eviction based on priority and timestamp metrics.

How do you implement robust, zero-copy serialization mechanisms for streaming high-bandwidth LiDAR or camera data between processes?

Design a computer vision and sensor monitoring system capable of dynamic health monitoring and fail-safe alerting across an autonomous fleet.

Architect an end-to-end telemetry and datalogging system that captures high-frequency sensor feeds on-vehicle, filters critical scenario events, and offloads data efficiently to cloud storage.

Design a scalable Command Center fleet management and orchestration system to route, monitor, and assist remote driverless vehicles in real time.

How would you structure an onboard software architecture to ensure proper functional safety isolation between non-critical logging modules and critical motion planning nodes?

Design a simulation resimulation framework that ingests raw vehicle log files and replays sensor inputs to evaluate performance regressions across software builds.

How do you model decision-making under uncertainty when an autonomous vehicle approaches an unsignalized intersection with occluded pedestrians?

Explain the mathematical principles behind multi-sensor online calibration (e.g., camera-to-LiDAR or IMU-to-wheel-encoder) and how you detect calibration drift in production.

Describe how you would extract uncertainty and informativeness metrics from neural networks to automatically mine long-tail, hard driving scenarios from large fleet logs.

Explain how you integrate linear-temporal logic or rule-based safety fallback layers with deep-learning-based perception outputs.

Walk me through a major technical project on your resume: what were the critical trade-offs, how did you structure the architecture, and what would you change today?

How do you minimize latency spikes caused by CPU thread contention, page faults, or cache misses in an onboard Linux compute node?

Describe the process of debugging a low-level inter-process communication (IPC) bottleneck or memory leak on an embedded vehicle platform.