How Palo Alto Networks Interviews in 2026: Process, Questions & What They Score

1. 01

   Merge Intervals.

   Sort intervals by start, then merge overlaps in one pass; reported in the online assessment.

2. 02

   Design and implement an LRU cache with O(1) lookup and eviction, then extend it with a TTL.

   Hash map plus doubly linked list for O(1) get and put, then expiry timestamps for the TTL extension.

3. 03

   Valid Anagram.

   Compares character frequency counts of two strings with a hash map or fixed-size array.

4. 04

   Given a list of strings, group and print all valid anagrams.

   Groups strings by a canonical key such as sorted letters or a character-count tuple in a hash map.

5. 05

   Remove single-child nodes from a binary tree.

   Tree recursion that splices out nodes with exactly one child while keeping the rest of the tree intact.

6. 06

   Implement a simple socket-based script or echo server.

   Basic socket programming: listen, accept connections, read bytes and write them back to the client.

7. 07

   Implement a Min Stack that returns the minimum value in O(1).

   Auxiliary stack or paired entries that track the running minimum so get-min stays O(1).

8. 08

   Given an N by N board, return all valid N-Rooks configurations using backtracking.

   Backtracking that places one rook per row and column and prunes conflicting placements.

9. 09

   Invert a binary tree.

   Recursive or iterative tree traversal that swaps the left and right children at every node.

10. 10

    Sort an array, for example by writing merge sort.

    Comparison sorting with O(n log n) analysis; one report named merge sort, a divide-and-conquer sort.

11. 11

    Solve a simple problem using breadth-first search (BFS).

    Breadth-first search with a queue and visited set; the report gives no detail on the specific problem.

12. 12

    Implement a solution to a design-and-coding prompt, then fix a bug in the existing code and change its behavior and structure in an object-oriented way.

    Debugging existing code under constraints, then refactoring it with object-oriented design as requirements change.

Reported problems, listed so you know what to expect. Practice them in your own editor or on the platform you prefer; SupaCV's practice mode coaches how you talk through them.

1. 01

   Design an API rate limiter, including a distributed version.

   Rate limiting algorithms, atomic counter updates and fail-open versus fail-closed behavior in a distributed setup.

2. 02

   Design a URL shortener.

   High-level design: ID generation, key-value storage, redirect latency and read-heavy scaling.

3. 03

   Design a NAT service.

   Design of address and port translation: a connection table, port allocation and entry timeouts.

4. 04

   Design an SSL decryption pipeline.

   System design of TLS interception at scale: certificate handling, throughput and security trade-offs.

5. 05

   Design a high-throughput distributed logging and alerting system.

   Log ingestion, buffering and alerting at high throughput, plus ordering across nodes with synchronized clocks.

6. 06

   Design a scheduler and a metrics monitoring platform.

   System design of a job scheduler and a metrics pipeline: ingestion, storage, aggregation and alerting.

7. 07

   Outline an architecture for ingesting, caching and processing a large live data stream across many client nodes.

   Streaming ingestion design: caching, fan-out to many client nodes, update frequency and processing throughput.

8. 08

   Design a social media website.

   High-level design of a social platform: data model, feed generation, storage choices and scaling.

Reported problems, listed so you know what to expect. Practice them in your own editor or on the platform you prefer; SupaCV's practice mode coaches how you talk through them.

1. 01

   Walk through how a packet moves through a firewall.

   Packet-flow knowledge across network layers: ingress, policy lookup, inspection and forwarding.

2. 02

   Answer networking fundamentals questions on TCP, TLS and DNS, such as the TCP three-way handshake and where TLS terminates.

   Protocol fundamentals: TCP connection setup, where TLS terminates, and how DNS resolution works.

3. 03

   Answer operating systems questions on processes, threads and memory.

   Operating systems fundamentals: process versus thread, memory layout such as stack and heap, and paging.

4. 04

   Explain the difference between concurrency and parallelism, and how you would synchronize access to shared state.

   Concurrency theory plus locking or other synchronization to protect shared state from races.

5. 05

   Explain object-oriented programming concepts and API fundamentals such as REST.

   Object-oriented principles and REST API basics such as resources, HTTP methods and status codes.

6. 06

   Answer questions on Kubernetes, networking and cloud infrastructure, tied to your past projects.

   Hands-on depth in Kubernetes, networking and cloud infrastructure, probed through your own past projects.

Reported problems, listed so you know what to expect. Practice them in your own editor or on the platform you prefer; SupaCV's practice mode coaches how you talk through them.

1. 01

   Why do you want to work at Palo Alto Networks, and why does security matter to you?

2. 02

   Tell me about a production bug you fixed under pressure.

3. 03

   How do you handle technical mistakes or system outages, and what concrete steps do you take immediately?

4. 04

   Describe a situation where you faced a significant conflict or technical disagreement within your team and how you resolved it.

5. 05

   How do you use AI coding tools such as GitHub Copilot in your daily workflow, and how do you verify their output?

6. 06

   Walk through a complex project on your resume: the overall architecture and your individual contributions.

7. 07

   Tell me about a time when you went above and beyond.

8. 08

   Tell me about a time you took the initiative to drive a technical solution forward despite ambiguous requirements.