Beginner
Arrays & Strings
Master two-pointer, sliding window, and prefix-sum patterns.
// welcome to the lab
Level up your coding cap.
Practice real challenges, build portfolio projects, and get 1-on-1 mentorship — all in one platform.
12,400+ Hours practiced
3,200+ Challenges
85 Mentors
function twoSum(nums, target) {
const map = new Map();
for (let i = 0; i < nums.length; i++) {
const diff = target - nums[i];
if (map.has(diff))
return [map.get(diff), i];
map.set(nums[i], i);
}
}
// Output: ✅ [0, 1]
// about
What is CodingCapCorner?
Hands-on Practice
3,200+ challenges across data structures, algorithms, and system design — with live test runners.
Real Projects
Build portfolio-grade apps with guided project tracks and code reviews from staff engineers.
1-on-1 Mentorship
Weekly office hours, resume clinics, and mock interviews with mentors from top companies.
Interview Loops
Full-cycle mock interviews — behavioral, system design, and coding — with written feedback.
// playground
Challenge Runner
Pick a language, difficulty, and topic — then hit Run to simulate test execution.
// Click "Run Tests" to begin…
// learning-paths
Learning Paths
Follow a structured path from basics to interview-ready.
Beginner
Stacks & Queues
Build intuition for LIFO / FIFO patterns and monotonic stacks.
Beginner
Trees & Graphs
DFS, BFS, topological sort, and shortest-path algorithms.
Intermediate
Full-Stack App
Build a task manager with auth, REST API, and a polished UI.
Intermediate
CLI Tooling
Create a developer CLI in Python with rich output and testing.
Intermediate
API Design
Design, document, and deploy a RESTful + GraphQL API.
Advanced
Behavioral Prep
STAR method practice with real interviewers and written feedback.
Advanced
System Design
Design Twitter, Uber, and Netflix — with mentor-led reviews.
Advanced
Live Coding
Timed whiteboard rounds with hints, optimal solutions, and scoring.
// mentors
Meet the Mentors
Priya Sharma
Staff Engineer @ BigCo
Tue 6-8 PM
Sat 10 AM
Marcus Chen
Senior SWE @ StartupX
Mon 7-9 PM
Thu 6 PM
Aisha Okonkwo
Tech Lead @ FinCorp
Wed 5-7 PM
Sun 11 AM
// testimonials
Code Reviews from Learners
@jordankim
✓ Approved
"The challenge runner is addictive. I solved 200+ problems in two months and landed a role at a FAANG. The mock interviews were insanely realistic."
@sarahruiz
✓ Approved
"Priya's mentorship sessions saved my System Design prep. She breaks down complex architectures into digestible steps."
@trevornguyen
⏳ Changes requested
"Great platform overall. The project tracks could use more guidance for beginners — but the community Slack is super helpful when you're stuck."
// pricing
Plans & Pricing
Free
Practice
$0/mo
- 200 challenges
- Community forums
- Basic analytics
- —
- —
Popular
Pro
Mentored
$29/mo
- All challenges
- 1-on-1 mentorship
- Project reviews
- Mock interviews
- Priority support
Team
Bootcamp
$99/mo
- Everything in Pro
- Team dashboard
- Custom tracks
- Dedicated mentor
- Invoicing
Compare Plans
Feature
Free
Pro
Team
Challenges
200
3,200+
3,200+
Mentorship
—
✓
✓
Mock Interviews
—
✓
✓
Project Reviews
—
✓
✓
Team Dashboard
—
—
✓
Custom Tracks
—
—
✓
Dedicated Mentor
—
—
✓
// progress
Your Progress Dashboard
0
Challenges Solved
0
Streak Days
0
Mock Interviews
Roadmap Kanban
Now
Finish Arrays module
Schedule mock interview
Next
Build full-stack project
Later
System Design deep-dive
Apply to 10 companies
// contact
Get in Touch
What to Include
- Your current skill level
- Target company or role
- Timeline and availability
- Preferred mentorship style
# Response Times
Free → 48 hrs
Pro → 12 hrs
Team → 4 hrs (dedicated)