8 Sync · learn to code like a real engineer

Ecosystem

From learning to code to real products.

Four learning surfaces connected through one 8 Sync account, plus three real products built by this same team: ZUS, mind0, AcoLeads. Pick where you want to start.

DSA
Coding practice
The Breach arena: solve problems, beat Desync, keep your streak. The judge auto-grades 7 languages — your solution is real submitted code, really graded.
- 1k+ DSA problems
- 7 languages
- FREE 80 submissions/day
the-breach ~ two-sum.js
1// the-breach · two-sum
2export function twoSum(nums, target) {
3 const seen = new Map();
4 for (let i = 0; i < nums.length; i++) {
5 const need = target - nums[i];
6 if (seen.has(need)) {
7 return [seen.get(need), i];
8 }
9 seen.set(nums[i], i);
10 }
11 return [];
12}
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$ 8sync run two-sum.js[0, 1]$ 8sync submit two-sum.js✓ Accepted · 8/8 test · 41ms★ streak +1 · Desync pushed back$
~/the-breach · mainjudge ready
coding.8syncdev.comExplore
LMS
Courses
Follow a 5-track path, each track led by a named mentor, capped by a 1-on-1 stage. Video + auto-graded quizzes.
- Path → mentor
- Video + quiz
- 1-on-1 at stage end
Lesson pathVideo · Quiz · Cert
course.8syncdev.comExplore
AI
News
Tech news aggregated from everywhere, summarized in Vietnamese by AI and read aloud. Read daily to earn points and unlock premium articles.
- Vietnamese summaries
- Read to earn points
Today's feedAI · Summary · TTS
news.8syncdev.comExplore
Live
IELTS
Grades all four skills against the Cambridge rubric, within 0.5 band of a human examiner.
- 4 skills L·R·W·S
- Within ≤ 0.5 band
L
R
W
S
Target 7.0+
ielts.8syncdev.comExplore

Real products from 8 Sync

Not just teaching code — the three products below run in production, built by the 8 Sync team itself.

JavaScript
TypeScript
Python
DSA
System Design
Git
CI/CD
Next.js
PostgreSQL
Docker
Vietnam IT interviews
AI Engineering

Write, run, fix — right in the browser.

Every concept ships with a sandbox to type, run and see the result instantly, instead of reading theory and forgetting it.

Runs instantlyJS · TS · Python run right in the browser: no install, no waiting on a server.
Clear feedbackstdout, return values and runtime errors show up right next to your code.
Safe by designEvery run is time-boxed and stops itself when a loop hangs.

Try the playground

Roadmap

A clear path, no getting lost.

Every step builds on the last. You always know where you are and what comes next.

01
Fundamentals
Syntax, programming mindset and tooling. A solid base before going further.
02
Algorithms & DSA
1k+ LeetCode-style problems, grasp big-O and pick the right data structure.
03
Real-world projects
Fullstack from scratch to a real deploy, with code review like on a team.
04
Production
Architecture, CI/CD and operations: work like a real engineer.