Elastic Coding Interview Questions
25 Elastic coding interview problems with full optimal solutions — 8 easy, 12 medium, 5 hard. Every problem ships with multiple approaches (brute-force first, then the optimal), complexity tables for each, company-specific tips on what an Elastic interviewer values, and a FAQ section.
Showing 2 problems of 25
- #42hardfrequently asked
42. Trapping Rain Water
Compute how much water is trapped between elevation bars after rain. Elastic uses this problem as a hard two-pointer question that tests the ability to reason about running maximums from both directions — the same prefix/suffix scan pattern underlies Elasticsearch's range-scoring and gap-detection in time-series anomaly detection.
- #642hardfrequently asked
642. Design Search Autocomplete System
Design a system that returns top-3 historical search suggestions as you type. This is arguably the most Elastic-aligned hard coding question: Elasticsearch's completion suggester is a production implementation of exactly this design, combining a Trie with frequency-ranked retrieval — candidates who know both the data structure and the ranking heuristic stand out immediately.