Chime Interview Questions
Practice the exact questions companies are asking right now.
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Design load balancing, caching, and idempotent APIs
You are designing a backend service that will be deployed across multiple instances behind a load balancer. Answer the following: 1) Load balancing - ...
Design multi-tab browser history and trade-offs
Design: Multi-Tab Browser History Context: Extend a single-tab browser-history component into a multi-tab manager that supports opening/closing tabs, ...
Design mobile check deposit system
System Design: Mobile Check Deposit for a Consumer Banking App Context Design a production-grade Remote Deposit Capture (RDC) feature that allows reta...
Explain sync/async, Go concurrency, SQL vs NoSQL
You are interviewing for a backend engineering role. Answer the following conceptual questions clearly and with concrete examples. 1) Synchronous vs a...
Compute early signals for user retention
You are given two tables that track signups and user transactions. Tables users - user_id (STRING, PK) — unique user - signup_ts (TIMESTAMP) — time th...
Simulate toppling board game outcome
Implement a function that, given the board size N (3–9 inclusive) and a list of move strings, returns one of: "in progress", "player 1 is the winner",...
Find missing number from concatenated digits
Given an integer n (1 ≤ n ≤ 99) and a digit string s formed by concatenating the decimal representations of the integers 1..n except for one missing n...
Compute minimum time with task cooldowns
You are given a multiset of task types represented by uppercase letters (e.g., A, A, A, B, B, C). Each task takes exactly 1 time unit to execute. Runn...
Design an A/B launch amid marketing confounds
You’re running a virtual launch (soft roll-out) of a new fitness tracker product to US+CA users from 2025-08-10 to 2025-08-24 with a 50/50 user-level ...
Implement single-tab browser history navigation
Implement a BrowserSession for a single-tab browser. APIs: - BrowserSession(string homepage): Initialize with homepage; current page starts at homepag...
Propose Innovative Ideas and Convince Others Effectively
Behavioral Interview Prompts (Data Scientist, Phone Screen) Context You are interviewing for a Data Scientist role with a focus on product impact, col...
Decide launch with CPA-profit trade-offs by segment
You receive an Excel with segment-level metrics for an A/B feature test. Decide whether to launch the feature for all users, only a segment, or not at...
Design an Effective A/B Test for Algorithm Launch
Design an A/B Test for a New Mobile App Recommendation Algorithm Context A mobile app team plans to ship a new recommendation algorithm that ranks con...
Navigate Complex Product Challenges in Behavioral Interviews
Behavioral & Leadership Phone Screen — Rapid-Fire Prompts Context You are interviewing for a Data Scientist role in a fast-paced phone screen focused ...
Determine Key Metrics for Spend-Tracker Launch Decision
A/B Decision Framework: Spend-Tracker Feature Context A fintech app ran an A/B test (Test vs. Control) on a new Spend-Tracker feature. Results are spl...
Design and Analyze A/B Test for Recommendation Widget
Scenario You are designing and analyzing an online A/B test for launching a new recommendation widget in a consumer-facing product (e.g., mobile and w...
Write SQL for noisy A/B launch metrics
PostgreSQL. Today is 2025-09-01. You’re given the following schema and toy samples: users(user_id INT, country TEXT, signup_date DATE, marketing_chann...
Write rolling-window SQL over weekly cohorts
You have two tables: users and transactions. Write a single SQL query (use CTEs) to produce, for each calendar week and user, weekly_revenue, a 4-week...
Analyze Acquisition Channels for User Value and Retention
acquisition | user_id | acquire_channel | acquire_date | | 101 | organic | 2023-01-05 | | 102 | paid_search | 2023-01-06 | | 103 | social_media | 2023...