Robinhood full stack engineer interviews cover both frontend and backend topics including API design, database modelling, React or Vue components, and end-to-end system design.
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QA Engineer
coding
Medium
Verified Question
#1
1. Find Maximum Trade Shares
Category: String coding problemA stock exchange processes a stream of trade orders sequentially. Each order specifies a limit price, a quantity of shares, and a side (either...Input: List
Output: Computed result
coding
Hard
Verified Question
#2
2. Maximum Multiplier Path
Category: Graph coding problemYou are given a directed graph with
n nodes labeled 0 through n - 1. Each directed edge connects node u to node v and carries an integer...Input: Graph (nodes and edges)Output: Integer
coding
Medium
Verified Question
#3
3. Social Network Money Transfers
Category: Trie-based coding problemYou are building the backend for a peer-to-peer payment app embedded in a social network. The system processes a sequence of commands, one per line,...Input: String
Output: Printed output
coding
Medium
Verified Question
#4
4. Top 10 Words
Category: Trie-based coding problemGiven a string of text, find the ten most frequently occurring words. A word is defined as any maximal sequence of consecutive alphabetic characters...Input: List
Output: Array
coding
Hard
Verified Question
#5
5. Stock Trades Matching
Category: Graph coding problemA brokerage reconciliation system compares two lists of trade confirmations: one from the in-house system (
house) and one from the street-side...Input: Graph (nodes and edges)Output: Computed result
coding
Easy
Verified Question
#6
6. Offset Commit
Category: Algorithm coding problemA message broker tracks which stream offsets have been fully processed. Offsets arrive out of order, and the broker maintains a "committed offset"...Input: List
Output: Array
coding
Medium
Verified Question
#7
7. Candlestick Data Generator
Category: Interval-based coding problemA trading platform displays price data as candlestick charts. Each candlestick summarizes trading activity over a fixed time interval and contains...Input: List
Output: Computed result
coding
Medium
Verified Question
#8
8. Find Middle Course
Category: Algorithm coding problemA university curriculum is structured as a sequence of prerequisite pairs. Each pair
[prereq, course] means prereq must be taken before course.Input: Integer(s)Output: Computed result
coding
Medium
Verified Question
#9
9. Employee Referral Program
Category: Tree coding problemA company runs a referral program where employees can refer new hires. When employee A refers employee B, A receives credit not only for B but also...Input: List
Output: Computed result
coding
Medium
Verified Question
#10
10. Fractional Order
Category: Algorithm coding problemA brokerage supports fractional share trading. All share quantities are represented in hundredths (e.g., 150 means 1.50 shares). The system maintains...Input: List
Output: Computed result
coding
Medium
Verified Question
#11
11. Margin Call
Category: Trie-based coding problemA brokerage account starts with $1000 in cash and no stock positions. You are given a list of trades, where each trade is represented as `[timestamp,...Input: List
Output: Computed result
coding
Medium
Verified Question
#12
12. Load Factor Calculation
Category: Graph coding problemA microservice architecture is modeled as a directed acyclic graph (DAG). Each service may depend on other services. Traffic enters the system...Input: Graph (nodes and edges)
Output: Array
coding
Medium
Verified Question
#13
13. Maximize Future Portfolio Value
Category: Algorithm coding problemYou have a budget of
m dollars to invest in securities. Each security is described by [symbol, currentPrice, futurePrice, maxShares]. Fractional...Input: Integer(s)Output: Integer
coding
Medium
Verified Question
#14
14. [Web Eng] Event Logger
Category: Interval-based coding problemYou are building a client-side event logging system for a web application. The page contains several colored elements that users can click. Your task...Input: Array
Output: Computed result
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