Course 01
System Design
Move from an ambiguous prompt to a defensible architecture, deep dive, and close.
- 68 lessons
- Scope
- 5 chapters
- Structure
- Overview
- Key concepts
- Building blocks
- Questions
Structured prep for selective interviews
Stop collecting questions. Start a focused interview course.
Choose a skill course or a company-specific track, then move from lesson to deliberate practice in one private workspace. Browse first—no account required.
- 2,335
- questions
- 12
- company tracks
- 72
- full previews
Course map · 015 chapters · 68 lessons
System Design
From ambiguous prompt to a defensible architecture.
- 01Overview3 lessonsStart
- 02Key concepts4 lessons→
- 03Building blocks11 lessons→
- 04Questions26 lessons→
Three ways to build the skill
Start with a course, not a dashboard.
Every course has a visible sequence, a concrete next lesson, and a practice surface built for the work.
Course 02
Coding Patterns
Watch each core algorithm, then study a transcript-backed explanation and visual proof.
- 16 video lessons
- Scope
- 94 diagrams
- Structure
- Time & space complexity
- Arrays & strings
- Linked lists
- Hash tables
Course 03
Coding 75
Build blank-editor recall through one dependency-aware practice sequence.
- 75 problems
- Scope
- Self-paced
- Structure
- Arrays & hashing
- Two pointers
- Trees & graphs
- Dynamic programming
The learning loop
Learn the pattern. Do the work. Inspect the attempt.
OfferHack keeps explanation and execution in the same path, so the next step is practice rather than another tab.
Try a complete question preview- LessonBuild a compact mental model.
Recognition rules, trade-offs, and a clear first move.
- PracticeWork in the right medium.
Runnable code, structured answers, system diagrams, and timed rehearsal.
- FeedbackReturn to the evidence.
Tests, saved attempts, and contextual coaching stay attached to the question.
Company tracks
Then shape the practice around your actual loop.
Company names identify independent practice banks, not affiliation, endorsement, or official interview guidance.
Four ways to verify the product before you create a workspace.
Open the catalog, try full previews, run a practice exercise, and read how the material is sourced.
Public catalogEvery question title is visible before signup.Search by company, role, interview area, topic, and priority.→72 full previewsTry a real first pass in a private scratchpad.Nothing you type in the public scratchpad is uploaded or saved.→Runnable free exerciseRun an Anthropic distributed-data exercise before creating an account.Test exact mode and median across sorted shards in the browser.→Published methodSee how reported patterns become original practice.Public signals, current role context, cross-checking, and explicit limits.→
Your next lesson is the point
Choose a course. Practice one question. Build from there.
Start practicing free Browse before signing upNo name collected · Private workspace