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Given an array of integers, how would you find two numbers that add up to a target?

Use a hash map to store complements as you iterate.

For each number num, check if target - num exists in the map.

If yes: return the pair
If no: add num to the map

Complexity: O(n) time, O(n) space

Questions

Flashcards

Skills

Languages

Sound familiar?

"I freeze up when asked to explain my thinking"

You know the answer but can't articulate the process

"I've solved 100 LeetCode but still feel unprepared"

Grinding problems without building real understanding

"I don't know where to start in system design"

Overwhelming scope with no clear framework

Most prep platforms teach you WHAT to solve.
They don't teach you HOW to think.

There's a better way.

Ready with Douglas teaches you the PROCESS interviewers want to see.

CLARIFY

Ask the right questions

APPROACH

Think out loud first

CODE

Write clean code

VERIFY

Test your solution

OPTIMIZE

Improve time & space

1. CLARIFY

Ask the right questions

2. APPROACH

Think out loud first

3. CODE

Write clean code

4. VERIFY

Test your solution

5. OPTIMIZE

Improve time & space

This is how senior engineers approach problems.

This is what interviewers are looking for.

This is what we teach.

Everything you need to succeed

Built by an engineer who's been through it, for engineers going through it.

Active Recall

Don't just read answers. Challenge yourself to think first, then reveal.

Spaced Repetition

Smart flashcards that appear right before you forget. Science-backed.

Code Playground

Write and run code right in the browser. Python, Java, JS, C++, C#.

Video Explanations

Watch Douglas walk through each problem step by step with chapters & insights.

Progress Dashboard

See your readiness score, track streaks, know what to focus on next.

3D Flashcard Decks

Beautiful flip animations, organized by skill, with spaced repetition built in.

System Design Mastery

Learn the core use case, why it's hard, and dive deep with Mermaid diagrams.

Learning Journal

Track your growth with timestamped notes, tags, and personal reflections.

Streak Tracking

Build consistency with daily practice. Don't break the chain!

Coming Soon

AI Interviewer

Practice with voice. Get real-time feedback on your responses.

Get interview-ready in 3 steps

Pick Your Focus

Choose the skills you need for your target role. DSA, System Design, or both.

Practice Daily

Work through questions with active recall. Challenge yourself before revealing answers.

Track Progress

See your readiness score climb. Know exactly when you're ready for the interview.

Start Your Journey

Engineers who landed their dream jobs

"I failed 5 interviews before finding Ready with Douglas. The active recall approach completely changed how I think about problems. Got an offer from Google 2 months later."

Sarah K.

Software Engineer at Google

"The system design content is incredible. Actually teaches you WHY things are hard, not just what the answer is. This is the only resource that made system design click for me."

Marcus T.

Senior Engineer at Meta

"I used to freeze during behavioral parts of coding interviews. Learning to think through problems step-by-step gave me so much more confidence. Landed my dream job at Stripe!"

Priya R.

Backend Engineer at Stripe

* Names changed for privacy. Real success stories from our community.