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Elastic N.V.

Large Enterprises

Elastic N.V. is a search and data analytics company best known for the Elastic Stack, which includes Elasticsearch, Kibana, Logstash, and Beats. Its technology is widely used for search, observability, and security use cases, enabling organizations to search, analyze, and visualize large volumes of data in real time.

2 interview notes · updated Jul 2026

Elastic N.V.·Software Engineer·Technical Phone Screen

Jun 2026
Elastic N.V. full-stack round focused on a buggy JavaScript flatten implementation. You had to read broken code, find the issues, and fix them live while talking through edge cases. Pretty dense for a single session.
  • You're given a JavaScript flatten(arr) function that recursively flattens nested arrays. Find and fix all the bugs in it.
  • Walk through test cases for the fixed flatten function: empty arrays, deeply nested input, and mixed types.

“The bugs they were fishing for: not recursing into non-array elements, misusing concat so it mutates or doesn't spread correctly, and circular reference handling causing infinite recursion.”

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Elastic N.V.·Software Engineer·Technical Phone Screen

Jun 2026
Interviewed for a full-stack role at Elastic and got a fairly focused coding problem around log stream processing. Not a brutal round but it had enough nuance to trip you up if you weren't thinking carefully about edge cases.
  • Given a stream of log entries, design a solution that tracks the frequency count per category and the timestamp of the most recent update for each category. How would you handle out-of-order timestamps efficiently?

“I went straight for a hash map keyed by category, which felt obvious.”

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