Rippling Software Engineer Coding & Algorithms Interview Questions
Practice 30 real Coding & Algorithms interview questions for Software Engineer roles at Rippling.
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Compute peak busy dashers with overlaps
You are given delivery logs as (dasherId, startTime, endTime) with integer times, where endTime is exclusive. A single dasher may accept multiple orde...
Aggregate expenses by person, trip, and category
Problem You are given a list of expense records. Each record has: - employee_id (string) - trip_id (string) - category (string, e.g., MEAL, HOTEL, TRA...
Compute maximum simultaneous drivers
Given N driver online intervals [start_time, end_time) during a day, compute the maximum number of drivers simultaneously online at any moment. Handle...
Compute peak concurrent drivers in 24 hours
Given delivery intervals across multiple drivers, compute the maximum number of distinct drivers simultaneously active within the last 24 hours from a...
Compute max simultaneous drivers last 24 hours
Given delivery intervals (driverId, startTime, endTime) already recorded, implement maxSimultaneousDriverInPast24Hours() that returns the maximum numb...
Implement an In-Memory File System
This question evaluates understanding of file-system abstractions, tree-based data structures, path parsing, and stateful directory and file managemen...
Find median of two sorted arrays
You are given two sorted arrays of integers nums1 and nums2 in non-decreasing order. Let the lengths be m = nums1.length and n = nums2.length. Either ...
Track article votes and last three flips
Problem Design an in-memory data structure for voting on articles. Users can vote on an article with either: - Thumbs up - Thumbs down - No vote (user...
Compute unique-dasher concurrency with tie-breaking
You are given N delivery assignments, each as (dasherId, startTime, endTime) with 0 <= startTime < endTime. A single dasher may hold multiple overlapp...
Compute concurrent online drivers
Question Given each driver’s chronologically sorted delivery records, build an algorithm that, for a timestamp t, returns how many distinct drivers we...