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Course

Software Engineering Interview Prep

Coding · System design · Behavioral

Live interview rooms with Agentic Owl — voice, whiteboard, and turn-by-turn practice.

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Track

System architecture

Software Engineering Interview Prep

Production systems on a shared whiteboard — start with Social Media Feed.

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Practice

Design a Social Media Feed

System design

Design the news feed for a social platform like Instagram or X. Users create posts, follow others, a…

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Track

Coding interview

Software Engineering Interview Prep

Algorithms, data structures, and complexity — think aloud with Owl.

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Practice

Binary Tree Level Order Traversal

Coding interview

Given the root of a binary tree, return the level order traversal of its nodes' values (from left to…

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Practice

Number of Islands

Coding interview

Given an m x n 2D binary grid which represents a map of '1's (land) and '0's (water), return the num…

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Practice

Design a URL Shortener

System design

Design a URL shortener like Bitly. Users submit a long URL and receive a short code that redirects t…

d/dx

Course

BC Calculus I

Differential Calculus

Rates of change, limits, derivatives, and applications — inquiry-driven depth with Agentic Owl.

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Course

BC Calculus II

Integral Calculus

Riemann sums, the Fundamental Theorem, volumes, and differential equations — Socratic tutoring on th…

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Course

BC Calculus III

Infinite Series · Polar · Vectors

Infinite series, Taylor/Maclaurin, polar coordinates, and vector calculus — the advanced BC capstone…

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Practice

Two Sum

Coding interview

Given an array of integers nums and an integer target, return the indices of the two numbers that ad…

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Practice

Longest Substring Without Repeating Characters

Coding interview

Given a string s, find the length of the longest substring without repeating characters.