How to Pass the Anduril Software Engineer Interview in 2026

The Anduril DNA (TL;DR)

Anduril's technical assessments gauge a candidate's ability to rapidly integrate and apply Advanced Technology to complex Defense Capabilities. The loop heavily probes for a pragmatic, results-oriented approach to engineering challenges, reflecting the company's mission of Anduril Transforming defense.

Interviews inPython C++Rust

The Anduril Interview Loop

Your onsite loop will typically consist of 5 rounds.

1
Round 1
Recruiter Screen
Motivation, role fit, logistics.
2
Round 2
Coding Screen
LeetCode-medium algorithmic problems under time pressure.
3
Round 3
System Design
Distributed systems, trade-offs at scale, architecture under constraints.
4
Round 4
Onsite Coding
LeetCode-hard, debugging, code clarity, edge cases.
5
Round 5
Behavioral / Leadership
Past evidence of ownership, influence, resolving conflict.

The Danger Zone: Top Reasons Candidates Fail

Based on our database of Anduril interview outcomes, avoid these common traps:

Choosing a simple list or array and not considering efficient querying.
Assuming reliable, high-bandwidth connections for updates.
Lack of robust verification mechanisms to confirm update integrity and success.
Blaming the hardware team for poor initial specifications

Test Yourself: Real Anduril Questions

Three real prompts pulled from our database.

Type · algorithmic

Implement a function to determine if two complex 3D polygons (representing aircraft or terrain features) intersect. Consider potential numerical precision issues and optimize for performance, as this check might be performed frequently.

Type · system-design

Design a system for real-time telemetry aggregation and analysis for a fleet of autonomous drones. Consider data ingestion, storage, processing, and visualization for mission control operators. How would you ensure high availability and fault tolerance?

Type · learning

We operate in environments where standard commercial off-the-shelf software often fails. Tell me about a time you had to reverse-engineer or deeply debug a proprietary communication protocol or legacy sensor driver to restore mission-critical functionality under a tight deadline. What was your methodology for decomposing the black-box system?

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Anduril Interview Question Bank

A sample from our database, grouped by round. Sign up to see the full set.

9 of 14 questions shown

Recruiter Screen

1
Type · motivation
What specifically about Anduril's mission in defense technology and aerospace excites you, and how do you see your software engineering skills contributing to our hardware-centric products?

Coding Screen

2
Type · algorithmic
Given a stream of sensor data from a drone (e.g., GPS coordinates, altitude, battery level), design an algorithm to detect and flag anomalous readings that might indicate a malfunction or environmental hazard. Assume you have a limited memory buffer.
3
Type · algorithmic
You are building a system to track multiple drones in a 3D space. Implement a function that, given a list of drone positions and a target region (defined by a bounding box), efficiently returns all drones within that region. Optimize for a large number of drones.
+ 1 more questions in this round (sign up to unlock)

System Design

4
Type · system-design
Design a system for real-time telemetry aggregation and analysis for a fleet of autonomous drones. Consider data ingestion, storage, processing, and visualization for mission control operators. How would you ensure high availability and fault tolerance?
5
Type · system-design
Imagine you need to build a secure, low-latency communication channel between ground control and a swarm of drones operating in a contested environment. What architectural choices would you make, and what are the primary security and performance trade-offs?
+ 1 more questions in this round (sign up to unlock)

Onsite Coding

6
Type · debugging
Here is a snippet of code intended to calculate the optimal flight path for a drone avoiding known obstacles. It's producing incorrect results in certain scenarios. Debug and fix the code, explaining your thought process and any edge cases you identify.
7
Type · algorithmic
Implement a function to determine if two complex 3D polygons (representing aircraft or terrain features) intersect. Consider potential numerical precision issues and optimize for performance, as this check might be performed frequently.
+ 2 more questions in this round (sign up to unlock)

Behavioral / Leadership

8
Type · ownership
Tell me about a time you identified a significant technical debt or architectural flaw in a system you were working on. What steps did you take to address it, and what was the outcome?
9
Type · collaboration
At Anduril, we often integrate software with hardware that is still in prototyping. Describe a situation where your software implementation hit a physical constraint or hardware limitation that was not initially accounted for in the spec. How did you negotiate the trade-offs between software complexity and hardware capabilities with the mechanical or electrical engineering teams?
+ 1 more questions in this round (sign up to unlock)