Arista Backend Engineer interview questions and process

Updated · 11 sources

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Candidates rate the Arista Backend Engineer interview Medium-Hard: Reports show a coding-heavy process with algorithm questions, C and OS fundamentals, and live coding that must actually run, and one candidate was rejected for not finishing the second problem in time. Reports describe 4 rounds, from Online assessment / first coding round to Design / architecture and fit round with engineering leadership.

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Arista Backend Engineer interview rounds

  1. Online assessment / first coding round: Reported as 3 problems in about 90 minutes in one case, or 2 problems in an hour in another. Topics seen: N-ary tree depth, a DP problem, sliding window maximum, and BST construction with node deletion.
  2. Technical + coding round (C, OS, problem solving)
  3. Hiring manager round
  4. Design / architecture and fit round with engineering leadership

Questions reported in Arista Backend Engineer interviews

  1. Vector and ArrayList difference in java, some more java questions I don\'t remember?
  2. How to swap two bits in a given integer?
  3. Factory Design Pattern
  4. Implement a dynamic array (vector in C++) in C using malloc
  5. In a given array find the maximum element for every window of size k

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Arista Backend Engineer interview: quick answers

How many rounds are in the Arista Backend Engineer interview?

Public reports describe 4 rounds for the Arista Backend Engineer interview: (1) Online assessment / first coding round, (2) Technical + coding round, (3) Hiring manager round, (4) Design / architecture and fit round with engineering leadership. Based on 11 public reports, last updated Oct 2026.

Is the Arista interview difficult?

Public reports put the Arista Backend Engineer interview at Medium-Hard difficulty. Reports show a coding-heavy process with algorithm questions, C and OS fundamentals, and live coding that must actually run, and one candidate was rejected for not finishing the second problem in time.

Does Arista ask DSA in Backend Engineer interviews?

Yes. Rounds that involve coding: Online assessment / first coding round, Technical + coding round (C, OS, problem solving). Reported coding questions include "Implement a dynamic array (vector in C++) in C using malloc" and "In a given array find the maximum element for every window of size k".

Sources

Based on 11 public reports: LeetCode Discuss (8), AmbitionBox (1), Blind (1), Glassdoor (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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