From first principlesto first offer.

DSA. System Design. ML. SQL. All of it.

Master algorithms with visual explanations, architect systems like the top 1%, and build the complete skill set that lands offers at companies that matter.

Visual learning. Real depth. The skills that actually get you hired.

Start Learning Practice Problems

CS Fundamentals

Build solid foundations in data structures, algorithms, and computer science theory.

Problem Solving

Master coding interview questions with step-by-step solutions and interactive practice.

Machine Learning

Learn ML algorithms, deep learning, and AI with hands-on projects and real-world datasets.

System Design

Design scalable systems and learn architecture patterns used by top tech companies.

SQL & Databases

Master database design, complex queries, and data management techniques.

Tech industry leaders who trust our curriculum.

Everything you need to excel in your journey.

A comprehensive learning ecosystem designed to take you from fundamentals to mastery.

Structured Curricula

Follow expertly curated learning paths for DSA, Machine Learning, System Design, SQL, and more. Depth and rigor in every module.

Explore Module

Interactive Roadmaps

Visualize your entire career journey. Dynamic, interactive roadmaps that adapt to your progress and goals, guiding you from novice to expert.

Explore Module

Interactive Visualizers

Watch algorithms come to life with step-by-step animations. Understand complex data structures through dynamic visualizations.

Explore Module

Practice Problems

Master coding with 500+ curated challenges from DSA, Machine Learning, and SQL. Each includes detailed editorials and multiple solution approaches.

Explore Module

System Design

Master high-level and low-level system design. Learn architecture patterns used by top tech companies like Netflix and Stripe.

Explore Module

Advanced Assessments

Test your knowledge with interactive quizzes and skill assessments. Get instant feedback and track your mastery levels.

Explore Module

CAREER TOOLKIT

Land the job.
Keep the momentum.

The same tools we wish we had when breaking into tech. Built for engineers who refuse to leave their career to chance.

4Power Tools

∞Potential

AI Resume Builder

New

Create professional, ATS-optimized resumes with AI assistance. Tailor your experience to specific job descriptions in seconds.

Job Application Tracker

Keep track of all your job applications, interviews, and offers in one centralized dashboard. Never miss a follow-up again.

Networking Tracker

Manage your professional connections, follow-ups, and coffee chats for effective, long-term career growth.

Professional Certificates

Earn industry-recognized certificates upon path completion. Share your achievements directly on LinkedIn and your portfolio.

You learn.
We track.

Focus on the material. We'll handle the bookkeeping.

Progress70%

Bookmarks

Save problems, patterns, and insights for later. One click to revisit.

Notes

Your scratchpad. Code snippets, key takeaways, whatever sticks.

Progress

See where you are, what you've done, what's next.

Streaks

Show up daily. The habit is the hack.

STAY ON TRACK

Show up.
Stay sharp.

Learning is a long game. We built the tools to help you stick with it — without the friction.

1Dashboard

0Distractions

The path from confused to confident.

Four steps. Zero fluff.

Choose Your Path

Select from CS Fundamentals, Machine Learning, System Design, SQL, and more. Each path is carefully structured to build your skills progressively.

Learn Interactively

Watch algorithms animate step-by-step. Read clear explanations. Understand the "why" behind every concept with our visual-first approach.

Practice & Apply

Solve curated problems with increasing difficulty. Take quizzes to test retention. Apply concepts in real coding challenges with instant feedback.

Track Your Growth

Monitor your learning streak. Earn badges and achievements. Visualize your progress with detailed analytics and contribution graphs.

The path from confused to confident.

Four steps. Zero fluff.

Choose Your Path

Select from CS Fundamentals, Machine Learning, System Design, SQL, and more. Each path is carefully structured to build your skills progressively.

Learn Interactively

Watch algorithms animate step-by-step. Read clear explanations. Understand the "why" behind every concept with our visual-first approach.

Practice & Apply

Solve curated problems with increasing difficulty. Take quizzes to test retention. Apply concepts in real coding challenges with instant feedback.

Track Your Growth

Monitor your learning streak. Earn badges and achievements. Visualize your progress with detailed analytics and contribution graphs.

Built by engineer, for engineers.

The numbers speak for themselves.

500+

Practice Problems

From easy warm-ups to FAANG-level challenges

50+

Visual Explainers

Algorithms you can actually see running

100+

Skill Assessments

Know exactly where you stand

10K+

Engineers Learning

You're in good company

Don't take our word for it.

Hear from engineers who made the leap.

The interactive visualizations helped me finally understand binary trees. I went from struggling to confidently solving medium-level problems in just 2 weeks.

Sarah Chen

Software Engineer at Meta

System design was always intimidating until I found this platform. The step-by-step breakdowns made complex architectures crystal clear.

Michael Rodriguez

Senior Developer at Google

I aced my FAANG interviews thanks to the problem-solving practice. The explanations are better than any book I've read.

Emma Thompson

ML Engineer at OpenAI

The interactive visualizations helped me finally understand binary trees. I went from struggling to confidently solving medium-level problems in just 2 weeks.

Sarah Chen

Software Engineer at Meta

System design was always intimidating until I found this platform. The step-by-step breakdowns made complex architectures crystal clear.

Michael Rodriguez

Senior Developer at Google

I aced my FAANG interviews thanks to the problem-solving practice. The explanations are better than any book I've read.

Emma Thompson

ML Engineer at OpenAI

The SQL section is phenomenal. I went from basic queries to optimizing complex database designs in production.

James Wilson

Backend Engineer at Stripe

Machine learning concepts finally clicked for me. The hands-on projects and real datasets made all the difference.

Priya Patel

Data Scientist at Netflix

Best CS learning platform I've used. The algorithm visualizations are a game-changer for understanding time complexity.

David Kim

Full Stack Developer at Amazon

The SQL section is phenomenal. I went from basic queries to optimizing complex database designs in production.

James Wilson

Backend Engineer at Stripe

Machine learning concepts finally clicked for me. The hands-on projects and real datasets made all the difference.

Priya Patel

Data Scientist at Netflix

Best CS learning platform I've used. The algorithm visualizations are a game-changer for understanding time complexity.

David Kim

Full Stack Developer at Amazon

The interactive visualizations helped me finally understand binary trees. I went from struggling to confidently solving medium-level problems in just 2 weeks.

Sarah Chen

Software Engineer at Meta

System design was always intimidating until I found this platform. The step-by-step breakdowns made complex architectures crystal clear.

Michael Rodriguez

Senior Developer at Google

I aced my FAANG interviews thanks to the problem-solving practice. The explanations are better than any book I've read.

Emma Thompson

ML Engineer at OpenAI

The interactive visualizations helped me finally understand binary trees. I went from struggling to confidently solving medium-level problems in just 2 weeks.

Sarah Chen

Software Engineer at Meta

System design was always intimidating until I found this platform. The step-by-step breakdowns made complex architectures crystal clear.

Michael Rodriguez

Senior Developer at Google

I aced my FAANG interviews thanks to the problem-solving practice. The explanations are better than any book I've read.

Emma Thompson

ML Engineer at OpenAI

Got questions?

We've got answers.

Can't find what you're looking for? Reach out to us

OneNoughtOne

From first principlesto first offer.

CS Fundamentals

Problem Solving

Machine Learning

System Design

SQL & Databases

Tech industry leaders who trust our curriculum.

Everything you need to excel in your journey.

Structured Curricula

Interactive Roadmaps

Interactive Visualizers

Practice Problems

System Design

Advanced Assessments

Land the job.Keep the momentum.

AI Resume Builder

Job Application Tracker

Networking Tracker

Professional Certificates

You learn.We track.

Bookmarks

Notes

Progress

Streaks

Show up.Stay sharp.

Four steps. Zero fluff.

Choose Your Path

Learn Interactively

Practice & Apply

Track Your Growth

Four steps. Zero fluff.

Choose Your Path

Learn Interactively

Practice & Apply

Track Your Growth

The numbers speak for themselves.

Hear from engineers who made the leap.

We've got answers.

What makes OneNoughtOne different from other learning platforms?

Do I need prior programming experience to get started?

How long does it take to complete the curriculum?

Will this help me prepare for technical interviews?

Can I access the content on mobile devices?

Do you offer certificates upon completion?

What if I get stuck on a problem?

Land the job.
Keep the momentum.

You learn.
We track.

Show up.
Stay sharp.