Lyft Software Engineer Interview Questions
Master your tech interview with our curated database of real questions from top companies.
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 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...
Discuss eligibility and behavioral scenarios
Behavioral and Logistics Questions (Onsite — Software Engineer) Context You are interviewing for a Software Engineer role in a behavioral and leadersh...
Design a scalable news feed system
Design a Scalable News Feed System You are building a news feed service for a large consumer mobile app with tens of millions of daily active users (D...
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...
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...
Explain resume projects and behavioral responses
Behavioral Interview Prompt (STAR) Context: You are interviewing for a Software Engineer role in an onsite behavioral/leadership round. Using the STAR...
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...
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 a scalable real-time chat system
System Design: Real-Time Chat (1:1 and Groups) Context Design a mobile-first, globally available real-time chat system that supports both 1:1 and grou...
Describe a failure and learning
Behavioral Question: Learning from Failure (Software Engineering) Describe a project where you failed or missed key objectives: 1. What happened? Prov...
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...
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...
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...
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...
Describe a challenging resume project
Behavioral Deep-Dive: Project You’re Most Proud Of Provide a structured walkthrough of one project from your resume that you’re most proud of. Keep it...