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 - ...
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...
Solve classic backend coding problems
Solve the following coding problems. 1. Find the missing number from a concatenated range You are given an integer n and a string s. The string was fo...
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...
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 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, ...
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...
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",...
Design browser history across tabs
Design a browser-history component. Start with a single tab and support these operations: - visit(url): navigate to a new URL from the current page. I...
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...
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...
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 ...
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 ...
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...
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 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...
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...
How do you validate the problem and define V1?
How do you determine whether your team is solving the right customer problem, and how do you decide what should be included in a version 1 (V1/MVP) ve...
Describe a 0-to-1 project you led
Tell me about a product or growth initiative that you personally led from 0 to 1. Explain the customer problem, why the opportunity mattered, how you ...