Arista Software Engineer interview questions and process

Updated 16 Oct 2026 · 14 sources

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Jul 20: Offer Jul 20 (r/developersIndia)

Candidates rate the Arista Software Engineer interview Medium-Hard: Rounds lean heavily on C/C++ internals, OS concepts and data structures coded from scratch, and even the 'system design' round was reported as low-level C++ rather than architecture. Reports describe 5 rounds, from Online Assessment to HR / Offer Discussion.

Difficulty: Medium-Hard
Skills asked about: C and C++, Data structures (linked lists, trees), Operating systems (threads, IPC, memory layout)

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Arista Software Engineer interview rounds

Online Assessment: Reported as 3 questions in 90 minutes: tree and number-manipulation problems on LeetCode style, plus one DP problem. Off-campus candidates ask how the OA is evaluated, so clear all test cases.
Technical Round 1 (DSA, live coding)
Technical Round 2 (C/C++ and OS focus)
Hiring Manager Round
HR / Offer Discussion

Questions reported in Arista Software Engineer interviews

Remove Linked List Elements (LeetCode), solved in O(N) time and O(1) space
Remove All Occurrences of a Substring (LeetCode)
Maximum Depth of N-ary Tree (LeetCode, from the OA)
Rotated Digits (LeetCode, from the OA)
Given a class with virtual functions, predict the output and size of the class object and explain why.
Write a function that accepts two unsigned char variables and returns their sum as an unsigned integer, handling carry overs.

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Arista Software Engineer interview: quick answers

How many rounds are in the Arista Software Engineer interview?

Public reports describe 5 rounds for the Arista Software Engineer interview: (1) Online Assessment, (2) Technical Round 1, (3) Technical Round 2, (4) Hiring Manager Round, (5) HR / Offer Discussion. Based on 14 public reports, last updated Oct 2026.

Is the Arista interview difficult?

Public reports put the Arista Software Engineer interview at Medium-Hard difficulty. Rounds lean heavily on C/C++ internals, OS concepts and data structures coded from scratch, and even the 'system design' round was reported as low-level C++ rather than architecture. The process has 5 rounds, from Online Assessment to HR / Offer Discussion.

Does Arista ask DSA?

Yes. Rounds that involve coding: Technical Round 1 (DSA, live coding). Reported coding questions include "Remove Linked List Elements (LeetCode), solved in O(N) time and O(1) space" and "Remove All Occurrences of a Substring (LeetCode)". Fundamentals-heavy and low-level: C/C++ coding, OS internals and data structures, with interviewers who may give little guidance or example output.

Sources

Based on 14 public reports: LeetCode Discuss (6), YouTube (5), AmbitionBox (1), Glassdoor (1), Reddit (1), last updated Oct 2026.

Compiled by Adarsh Sharma from public candidate reports. Unofficial guide: PortLume AI is not affiliated with Arista.

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