BUILD CODING SKILLS.
PROVE WHAT YOU CAN DO.

From your first Two Sum to a ranked, verified engineer — a tour of the entire platform in ten scrolls. Keep scrolling. The world reacts as you read.

Cold starts<50ms

Streak7 days

Pass rate98%

◈ PAGE ONE — FIRST COMPILE

 READY

def two_sum(nums, target):
    lookup = {}
    for i, n in enumerate(nums):
        if target - n in lookup:
            return [lookup[target-n], i]
        lookup[n] = i

Plot twistall tests green

Runtime0.08s · 24 MB

Feelingunstoppable

SCROLL — THE STORY UNFOLDS ▼

CHAPTER 01 — PROLOGUE

Build coding skills. Prove what you can do.

A blank editor, a blinking cursor, and one question: can you make the machine agree with you? Scroll — the story is scrubbed by your thumb.

CC++JavaPython

CHAPTER 02 — THE STUDIO

No installs. No config. Just code.

The workshop opened inside the browser. Four languages, sub-50ms cold starts, a terminal that already knew your name.

0 installs4 languages<50ms runs

CHAPTER 03 — THE COMPILER

Source in. Verdict out.

Lex, parse, codegen, execute — every keystroke travels the pipeline and comes back as a cold, honest result.

LEX 2msPARSE 6msRUN 42ms

CHAPTER 04 — THE SANDBOX

Every run lives in a glass box.

Isolated, metered, ephemeral. Blow it up if you like — the container dissolves and leaves nothing but the grade behind.

2 vCPU512 MBisolated

CHAPTER 05 — THE PATH

A skill tree rises from the page.

Three roads diverged — algorithms, systems, enterprise craft. Pick the trail you will walk every single day.

AlgorithmsSystemsEnterprise

CHAPTER 06 — THE TRIAL

Skill untested is just rumor.

The clock starts. Tab switches are watched, memory is metered, and the test suite delivers a verdict with no small talk.

45 minproctored4/4 green

CHAPTER 07 — THE FINALE

The film ends. Your commit history begins.

You have toured the whole system in one continuous take. The only scene left is the one you write yourself.

StudioTrialsRanks

KEEP SCROLLING — THE STORY IS SCRUBBED BY YOU

CHAPTER 02 — THE STUDIO

Then, a workshop appeared — no setup, just code.

Our hero needed no installs, no config files, no yak-shaving. The Code Studio opened in the browser: four languages, instant verdicts, a terminal that felt like home.

Zero installs

Compilers live in the cloud

4 languages

C · C++ · Java · Python

Instant runs

Sub-50ms cold starts

CODERISE CLOUD WORKBENCH v2.4

GCC 13.2 • UTF-8 • Containerized Sandbox

EXPLORER

Memory Footprint

12.4 MB / 512 MB

// Fast I/O Competitive Template
#include <iostream>
#include <vector>
#include <unordered_map>

std::vector<int> twoSum(std::vector<int>& nums, int target) {
  std::unordered_map<int, int> map;
  for (int i = 0; i < nums.size(); ++i) {
    int diff = target - nums[i];
    if (map.count(diff)) return {map[diff], i};
    map[nums[i]] = i;
  }
  return {};
}

TERMINAL OUTPUT

$ g++ main.cpp -O3
$ ./a.out
CodeRise Cloud IDE ready.
Compilation successful in 42ms.

Test Case #1✓ Test 1

Test Case #2✓ Test 2

Test Case #3✓ Test 3

Test Case #4✓ Test 4

“and so the hero compiled their first program — and the machine answered back: passed.”

ACT 02½ — LIVE COMPILATION DEMO

Instant Code Execution & Automated Logic Grading

Experience lightning-fast client-side code evaluation — test your logic against test suites across Python, Java, and C with zero latency.

STEP 1 · WRITE CODE

Clean multi-language editor with syntax checking and line numbers.

STEP 2 · LOGIC EVALUATION

Instant client-side logic verification — no external server delays.

STEP 3 · TEST RESULTS

Automated test suite verification with immediate pass/fail feedback.

CHAPTER 03 — THE COMPILER

Source in, verdict out — a pipeline you can watch.

Lexing, parsing, codegen, execution — the compiler stage turns keystrokes into cold verdicts in milliseconds, across C, C++, Java and Python.

01 · LEX

Tokens in 2ms

Keywords, symbols & literals streamed.

02 · PARSE

AST in 6ms

Structure checked, errors pinpointed.

03 · RUN

Verdict in 42ms

Sandboxed, measured, graded 4/4.

$ g++ -O2 -std=c++20$ javac 21 + sandbox$ python 3.13 isolated$ gcc -Wall -Wextra

“compiled and contained — every run happens inside a glass box that vanishes when done.”

CHAPTER 04 — THE SANDBOX

A glass container for every single run.

Isolated, ephemeral, reproducible. Your code executes in a fresh container with metered CPU and memory — then the box dissolves, leaving only the verdict.

◈ EPHEMERAL CONTAINER — LIVE

CPU

2 vCPU · metered

Memory

512 MB · capped

Disk

ephemeral · wiped

Network

isolated · safe

“safe to explode things here — the sandbox always cleans up after you.”

CHAPTER 05 — THE TRIAL

But skill untested is just rumor — time for the trials.

The clock started. Tab-switches were watched, memory was measured, test suites delivered their cold verdicts. Three trials stood between our hero and proof.

I. The DSA Trial

Arrays, binary search, trees & DP under timed pressure.

45 min · 4 challenges

II. The Systems Trial

Pointers, heap vs stack, complexity & cache behavior.

35 min · 3 challenges

III. The Enterprise Trial

OOP design, collections, threads & clean patterns.

40 min · 4 challenges

“the system assembled — all that remained was to begin.”

CHAPTER 06 — THE FINALE

The film ends.
Your commit history begins.

You toured the whole system — studio, compiler, sandbox, practice, paths, trials, ranks. Now write the next chapter yourself.

✦ THE END … OR THE BEGINNING ✦

BUILD CODING SKILLS.PROVE WHAT YOU CAN DO.