Track 01 · Data Structures & AlgorithmsOrdered track
Interview prep with a map
Skip the 3,000-problem grind. Learn the patterns that matter, in order.
Built by a senior FAANG engineer who's been through the loop. Follow an ordered prerequisite roadmap, watch each pattern run frame by frame, and quantify your journey to actually measure progress.
- Ordered Roadmap
- Prerequisite tree
- Visual Stepper
- Frame-by-frame code
- DSA + SysDesign
- Dual-track mastery
- Live Code Judge
- In-browser execution
Visual-Based Learning
Watch the code change the data.
Step through the Brute Force baseline and the Optimal single pass frame by frame before you write a single line of code.
PythonBest Time to Buy and Sell Stock
1def maxProfit(prices):
2 l, r = 0, 1
3 maxP = 0
4 while r < len(prices):
5 if prices[l] < prices[r]:
6 maxP = max(maxP, prices[r] - prices[l])
7 else:
8 l = r
9 r += 1
10 return maxP
VariablesFrame 3 / 3
l1
r4
prices[r] − prices[l]5
maxP4 → 5
r sees 6. Profit 6 − 1 = 5 in a single O(n) pass.
Actual Roadmap · Not Just a Bank of Problems
DSA and System Design tracks, structured in prerequisite order.
Track 02 · System DesignArchitecture track
Who built this
Built by a senior FAANG engineer who's been through the loop.
The short map that would have helped before those interviews: one pattern, watch it move, then write it yourself.
Simple pricing
Go monthly while you prep, or annual to save 65%. Both include full access and ongoing curriculum updates, and you can cancel anytime.
Monthly
$19.99 / month
Billed monthly. Cancel anytime.
- Full access to all DSA & System Design courses (including new annual updates)
- Interactive Brute Force → Optimal frame-by-frame code walkthroughs
- Multi-language code judge (Python, TypeScript, Java, C++) & architecture drills
- Quantified progress tracking across the entire prerequisite roadmap
- Cancel anytime from your account
Best value · Save 65%
Annual
$84.99 / year
Billed yearly. About $7.08 a month.
- Full access to all DSA & System Design courses (including new annual updates)
- Interactive Brute Force → Optimal frame-by-frame code walkthroughs
- Multi-language code judge (Python, TypeScript, Java, C++) & architecture drills
- Quantified progress tracking across the entire prerequisite roadmap
- Cancel anytime from your account