Today's mission
- Watch: REST routing walkthroughTrainer session · 18 min
- Build: /search endpoint with filtersIn progress · 4 of 5 tests passing
- Break: fix 3 planted bugs in authDebug lab · unlocks after build
Continue building
01 — Courses
Batches assign the courses. Search yours, continue what you started, and open the next lesson.

Course
Title your instructor publishes
A short description, when one has been written.
Module
Lessons in position order
Module
Mark a lesson complete
Progress
Fills as you finish
02 — How we teach
Lectures alone don't make engineers. So no topic ends at “understood”. It ends at built, broken, explained and shipped. Tap a step to see it.
Step 01 of 5 · Spark
Each concept opens with a real situation: a slow search, a broken checkout, a model that guesses wrong. You meet the problem before the theory that solves it.
Attempt it cold. Write down your first approach, even if you suspect it is wrong.
When you have felt the problem, the concept lands as an answer, not as a fact to memorise.
// Problem 01 · Campus placement portal// 12,000 students. A recruiter filters by CGPA.// The search takes 4.2 seconds. Why?Your first approach:> check every student one by one…> is there a way to skip half of them?
03 — Inside the LMS
When you log in, you don't scroll through a syllabus wondering where to start. You see one thing: what to do today, and why. Here's a learner's screen, numbered so you can follow along.
TRAILBLIZLearn
Full-Stack Development · Module 4 · APIs & Databases
Today's plan: about 2 hrs 10 min
Today's mission
Continue building
routes/search.js
router.get('/search', async (req, res) => {
const { branch, minCgpa } = req.query;
const rows = await db.students
.where({ branch })
.andWhere('cgpa', '≥', minCgpa);
res.json(rows);
});Skill map
Mastery from your attempts
Gap spotted: System basics → 2 short labs added to this week
Mentor code review
Mentor · on line 5 of search.js
Logic is right. But if minCgpa isn't sent, this compares against undefined. Default it, or reject the request with a 400. Which would a real user prefer?
Doubt thread
Why does andWhere need the operator as a separate argument?
Trainer: So the query builder can escape the value safely. Try passing it as one string and see what the SQL log shows you.
Linked to this exact line of your code
Placement readiness
Built from problems solved, reviews passed, projects shipped and mock interviews. Next unlock: first mock interview.
The LMS breaks your track into daily missions: watch, build, break. You always know the next step and roughly how long it takes.
A built-in playground runs your code against test cases as you type, so you find out what works without setting anything up.
Mastery is measured from your actual attempts. When a topic is weak, practice for it is added to your week automatically.
Mentors comment on specific lines, the way a senior engineer would. You fix, reply and resubmit in the same place.
Ask a question right where you are stuck. Trainers answer with context, often with a nudge rather than the answer.
Every solved problem, review and mock interview feeds one profile, so placement readiness is visible, not a guess.
04 — A real week
Mon
LiveThe trainer opens the week with a real problem and builds the solution with you, live.
Tue
LabProblems climb from guided to unguided. The next rung unlocks when you clear the last.
Wed
LabPlanted bugs, real error messages, and hints only when you ask for them.
Thu
PeerExplain, question, get pushed. Communication practice hiding inside a tech session.
Fri
LabApply the week to your module project and submit it for mentor review.
Sat
LiveSolve under interview conditions, then walk through the solutions together.
Sunday: rest. Consistency beats cramming, so the schedule protects one day off.
05 — How you'll know you're ready
Marks tell you what you remembered on one day. We track what you can actually do — and every signal links back to real work you can show a recruiter.
Readiness profile
Sample learner06 — Tracks
Each track runs on the same loop and the same LMS. What changes is what you'll be able to do at the end, and what you'll have built to prove it.
By the end, you can
Look at an unfamiliar problem, pick the right structure, and defend your choice against a timer.
What you'll build
By the end, you can
Build, deploy and debug a working web application end to end, from database to UI.
What you'll build
By the end, you can
Train a model on messy real data, measure it honestly, and explain why it fails when it does.
What you'll build
By the end, you can
Work through quantitative and logical sets quickly, with methods instead of guesswork.
What you'll build
By the end, you can
Speak clearly in a group discussion, an HR round, and a technical walkthrough of your own project.
What you'll build