Lyft Interview Questions
Practice the exact questions companies are asking right now.
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Implement a nested key-value store
Design and implement a nested key–value store that supports set(path, value), get(path), and delete(path), where path is dot-delimited (e.g., "a.b.c")...
Design experiments for marketplace balance
You propose a new supplier prioritization (ranking) policy intended to increase order completion in a two-sided marketplace with known interference be...
Analyze Causes of Increased Lyft Ride Wait Times
Scenario A ride-hailing marketplace observes a 20% month-over-month increase in rider wait time (time from request to driver arrival). Tasks 1) Root-c...
Implement pagination and a time-versioned key-value store
Implement two coding tasks: 1) Transaction pagination: Given an in-memory collection of transaction records with fields (txn_id: string, user_id: stri...
Compute Poisson supply–demand match probability
In a city-day of a two-sided marketplace, customer demand D ~ Poisson(8) and supplier capacity S ~ Poisson(6), assumed independent. (a) Compute P(S >=...
Design a distributed web crawler
System Design: Distributed Web Crawler (1,000 Heterogeneous Workers) Context You are asked to design a production-grade web crawler that begins from a...
Investigate Causes and Effects of Dynamic Pricing on ETAs
Lyft ETA Increase, Pricing Strategy, and Experiment Design Context - Lyft observes a 20% month-over-month increase in rider wait times (ETA). Assume E...
Investigate Sudden Metric Changes and Design A/B Test
Scenario A core business metric (e.g., conversion, cancellations, or gross bookings) shows a sudden spike or drop. Leadership asks for a rapid root-ca...
Implement command-driven in-memory key-value database
Implement a command-driven in-memory key–value database. Supported commands (one per line): 1) SET key value 2) GET key → print value or NULL 3) DELET...
Solve grid compromise spread with BFS
You are given an m×n grid representing a data center: 0 = empty rack, 1 = secure server, 2 = compromised server. Each minute, any secure server that i...
Analyze Rider Behavior in Dynamic-Pricing Trial
Dynamic-pricing trial: rider behavior Context (assumptions made explicit) - Each day the rider has two potential ride opportunities. - For any specifi...
Investigate Causes of Driver WOW Score Drop
Investigating a 10% QoQ Drop in Driver WOW (Satisfaction) Context Assume WOW is a standardized driver satisfaction metric collected via in-app surveys...
Explain Bayes’ Theorem and P-Value in Decision-Making
Statistics Fundamentals: Bayes' Theorem and p-Values Context Stakeholders want clear, decision-focused explanations of two foundational concepts used ...
Design a temporal key-value store with historical reads
Implement a key–value store supporting set(key, value, timestamp) and get(key, timestamp) -> the value at the greatest timestamp ≤ the given timestamp...
Design web crawler for 1000 devices
Distributed Web Crawler: Design for 1,000 Devices Context Design a production-ready web crawler that starts from a single seed URL and scales crawling...
Implement paginated retrieval of transactions
Given a large list of transaction records (id, userId, amount, createdAt), implement APIs to return transactions in reverse chronological order with p...
Print the K-th non-empty line
Given a large UTF-8 text file, write a program that prints the K-th non-empty line. Do not load the whole file into memory. Specify how you handle fil...
Design a scalable news feed system
Design the backend for a social app news feed Context You are designing the backend that powers a mobile social app's home/news feed at large scale. T...
Develop Dynamic-Pricing Algorithm for Lyft Balancing Key Factors
Scenario You are designing Lyft’s real-time dynamic-pricing system ("surge") to balance rider demand, driver supply, and company revenue while meeting...
Design Dynamic Pricing System for Lyft: Key Features & Models
Scenario You are designing Lyft's real-time dynamic-pricing system to jointly optimize rider experience and marketplace health. The system should adju...