Software Engineer Coding & Algorithms Interview Questions
Practice the exact questions companies are asking right now.
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Implement an in-memory database with TTL and backup
In-Memory Database (Levels 1–4: TTL and Backup/Restore) Implement an in-memory database that stores records identified by a string key. Each record co...
Implement an in-memory SQL-like table
Problem Implement a simple in-memory database for one table. All values are strings. Each row is identified by a rowKey (string). Each row contains co...
Implement credit ledger with out-of-order timestamps
Problem You are implementing a GPU credit ledger that supports adding credits, charging credits, and querying balances. Requests can arrive in any tim...
Implement toy-language types and generic substitution
Problem: Toy Language Type System (Printing + Generic Resolution) You are implementing a small type system for a custom “Toy Language”. Types can be: ...
Find path in implicit Fibonacci tree
You are given a special family of binary trees called Fibonacci trees. The k‑th order Fibonacci tree T(k) is defined recursively: - T(1) is a single n...
Simulate turn-based monster team battle
Design an object-oriented model and implement the core battle logic for a turn-based fight between two teams of monsters. The system should simulate t...
Implement frequency + distance top‑K queries
You will implement solutions for two coding interview questions. Question 1: Return the top‑K points by frequency (with distance tie‑break) You are gi...
Implement multi-level task manager APIs
You are implementing an in-memory task management system with a set of APIs that evolve over 4 levels. All APIs receive a timestamp: int parameter. Un...
Solve matrix groups and recipe inventory
Problem 1: Find the smallest 3×3 group in a matrix You are given an m × n 2D integer array grid. - Partition the grid into non-overlapping 3×3 blocks,...
Design stack with O(1) minimum query
Design a stack-like data structure that supports the following operations, each in O(1) time: - push(x): push integer x onto the stack - pop(): remove...
Implement a memory allocator with malloc/free
Problem You are implementing a simplified memory allocator over a contiguous memory region. Initialize the allocator with a fixed total size: - alloca...
Dedupe titles in per-shelf viewport
You are rendering a streaming app home page. - The home page consists of shelves displayed from top to bottom. - Each shelf contains a list of titleId...
Implement staircase printing and distributed mode/median
Problem A: Print a “staircase” pattern Implement a function that prints a staircase with n rows. Input - An integer n (n >= 1) Output - Print n lines....
Compute courier pay and implement load balancing
Problem 1: Compute courier (delivery driver) pay You are given a sequence of delivery-related events for a courier during a day. Your task is to compu...
Detect and remove matched words in a char stream
You are processing a stream of characters (arriving one-by-one). You are also given a list of target words. Each time a new character arrives, it is a...
Count business days excluding holidays
Problem: Count Working Days Between Two Dates Given a start date, an end date (inclusive), and a set of holiday dates, compute the number of working d...
Generate outputs for images and pipelines
You are given m input images and n processing pipelines. - Each pipeline is an ordered list of k operations (e.g., resize, rotate, crop, blur, color t...
Compute minimax grid path and network delay
Problem (two related shortest-path tasks) Part 1 — Minimize the maximum value along a grid path ("minimax" path) You are given an m x n integer grid H...
Find earliest time all riders become connected
You are given activity logs for a ride-sharing app. Each log entry indicates that two riders shared a ride at a certain time, which creates an undirec...
Implement banking, knapsack, and pagination tasks
Problem A — Banking system command processor Implement an in-memory banking system that processes a sequence of commands in timestamp order. Entities ...