Anduril's Interview Process (2026)

Blog / Anduril's Interview Process (2026)

Anduril's software engineer interview process is fast-moving and mission-focused, typically wrapping up from first contact to offer in around three to four weeks. Here's a general picture of what most candidates report experiencing:

Recruiter Phone Screen: Usually around 30 to 60 minutes, this call focuses on your technical background and, importantly, your genuine motivation for working in the defense sector. Expect a direct question about why you want to work at Anduril specifically.
Technical Phone Screen: A 60-minute coding session, typically conducted via HackerRank or a similar collaborative environment. Candidates often report receiving a deliberately ambiguous prompt where clarifying requirements is part of the evaluation.
Final Round (Super Day): A series of back-to-back sessions, usually four rounds, covering coding, system design or object-oriented design, and a behavioral interview. This can be virtual or in person and typically takes place in a single day.

To prepare effectively, focus your study plan on these key areas that Anduril's SWE interviews are known to test:

Data Structures & Algorithms (DSA): LeetCode-style coding challenges with a strong emphasis on graphs, heaps, and follow-up constraints.
System Design (High-Level Design): Designing scalable systems and low-latency components, often tied to real-world autonomous systems challenges.
Object-Oriented Design (Low-Level Design): Designing and implementing classes and interfaces from scratch, not just whiteboarding a diagram.
Behavioral: A deep resume walkthrough focused on ownership, mission alignment, and performing under pressure.

1. Data Structures & Algorithms (DSA)Graphs are the most commonly reported topic across Anduril's coding rounds. Be comfortable with BFS, DFS, cycle detection in directed graphs, Union-Find for connected components, and variations on classic problems like Number of Islands. Our graphs questions are a good place to start building that fluency.Heaps also come up frequently, particularly in problems involving real-time data prioritization or streaming inputs.Alongside heaps, candidates report seeing sliding window problems, palindromic substring questions, and geometry-based problems like Maximum Number of Visible Points on a 2D plane. Brush up on heaps and sliding window patterns as part of your core prep.One thing that sets Anduril apart is the follow-up constraint. Interviewers will often accept your first solution and then immediately ask how it changes if the function is called 10 million times per second or if memory is severely limited. Practice optimizing beyond your initial answer, not just getting to a working solution.For a focused starting point, work through our 100 most commonly asked DSA questions to make sure your fundamentals are sharp across all the key topic areas before your screen.

2. System Design (High-Level Design)Anduril's system design round tends to cover two flavors: web-scale systems like a URL shortener or notification service, and lower-latency components more specific to autonomous systems, such as a real-time sensor data processor or a telemetry ingestion service. Even if you're earlier in your career, most candidates report facing some form of this round.For the autonomous systems angle, think about how you'd handle high-frequency data pipelines with strict latency requirements. Practicing on a problem like designing a Radar Data Pipeline is a good way to get comfortable with that framing. Our High-Level Design case studies cover both web-scale and infrastructure-focused scenarios.Ambiguity is intentional here too. The interviewer wants to see how you define scope, ask clarifying questions, and make trade-off decisions out loud. Spend as much time practicing the thinking process as you do the final architecture.

3. Object-Oriented Design (Low-Level Design)Unlike many companies that stop at a whiteboard diagram, Anduril often expects you to actually write the classes and interfaces during the OOD round. Clean code, edge case handling, and scalability matter as much as the high-level structure.Good problems to practice with include designing a High Frequency Sensor Data Aggregator or a Memory Efficient Circular Frame Buffer, both of which reflect the kinds of low-latency, resource-aware systems Anduril builds. Our Low-Level Design practice section has more worked examples to build from.Focus on writing clean, readable code rather than rushing to a complete solution. Interviewers are evaluating your engineering judgment, including how you handle ambiguous requirements and how you structure code for extensibility.

4. BehavioralThe behavioral round is usually led by a senior leader or director and functions more like a deep resume walkthrough than a standard set of behavioral questions. They're probing for ownership, how you've handled high-pressure situations, and whether you can operate at speed with limited direction.Anduril is serious about mission alignment. You need to be able to articulate a genuine, specific reason for wanting to work in the defense sector. Vague answers about startup culture or growth opportunities won't land well here. Come prepared with concrete examples from your experience that demonstrate bias toward action and extreme ownership.Structuring your answers using the STAR principle will help you stay focused and clear under pressure. For broader preparation across ownership and values-based questions, the Behavioral Playbook covers the frameworks and common patterns you'll want to have ready.

ConclusionAnduril moves fast and expects candidates who are ready to match that pace. Start by sharpening your graph and heap fundamentals, get comfortable designing and implementing systems from scratch, and prepare a clear, honest answer for why you want to build technology in the defense space. For a structured path through every stage, follow the Anduril Interview Roadmap to work through each area in the right order.

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