Smart AI Code Playground

All-in-one AI playground · 6 subjects

One AI playground for SQL, Python, Java, C/C++, PySpark & GCP

Practice every coding interview subject in one place. The AI generates questions, grades your real code, explains the theory, and resumes exactly where you left off — across every language and device.

Create your free account See all tracks
SQLPythonJavaC / C++PySparkGCP
  • 6 subjects
  • 6 practice modes per subject
  • Live AI voice interview
  • Progress saved across devices

Every practice tab, and what it's for

Each subject opens into the same six tabs, so once you learn one workspace you know them all. Pick the tab that matches what you need today.

Today

Your daily warm-up. One fresh, level-appropriate question every day so practice becomes a habit instead of a weekend cram.

Use it for a 15-minute daily streak.

Free practice

An open 50-question session on any business domain you type in (e-commerce, banking, logistics…). Difficulty ramps from beginner to advanced as you go.

Use it when you just want volume and variety.

Topic-wise

Pick a single concept — joins, window functions, CTEs, indexes, pointers, streams, DataFrames — and drill a focused set of questions on only that concept.

Use it to turn one weak topic into a strength.

Targeted

Tell the mentor your goal or the company you're interviewing at, and it builds a personalised plan of questions matched to that hiring bar.

Use it in the last week before an interview.

Data Engineering

Real-world pipeline and warehouse scenarios: modeling, SCDs, ETL/ELT, quality checks, partitioning and cost-aware SQL — the questions data teams actually ask.

Use it for DE / analytics-engineer roles.

Solved

Your personal library. Every question you solve is saved with your answer, the model solution and the unique functions you used, so revision is instant.

Use it to revise the night before.

Alongside the tabs, every question ships with an ERD, schema, seed data, an About panel and a Theory panel on a resizable side pane — plus hints, debugging help and an AI chat mentor you can ask anything, including screenshots.

Live AI Interview — the closest thing to the real call

Most people can solve the problem but freeze when they have to explain it out loud. The live interview fixes exactly that: a spoken, timed, JD-aware mock interview that ends with a written scorecard.

Paste the job description

Add the role, stack and JD. The interviewer calibrates its questions and its scoring bar to that exact job instead of asking generic trivia.

Speak your answers

A real voice conversation with an animated AI interviewer. Voice activity detection means it pauses the moment you start talking — you can interrupt, just like a real call.

Camera + scratchpad

Your webcam preview keeps it realistic, and a live scratchpad lets you write code or sketch a design while you explain.

Full scorecard at the end

A written report with per-skill radar scores, strengths, gaps, better phrasings for weak answers and a clear next-step study plan.

Explore the live interview

Six tracks. One account. Zero switching cost.

Every track has its own AI question engine, visual tutorials, solved library, and progress state — switching between SQL, Python, Java, C/C++, PySpark or GCP never overwrites another one.

SQL / MySQL

Generated schemas, seed data, ERDs and semantic query grading.

Open track

Python

DSA, OOP and system-design micros graded against hidden tests.

Open track

Java

Collections, streams, concurrency, records and Spring Boot scenarios.

Open track

PySpark

DataFrames, joins, windows, tuning and structured streaming.

Open track

C / C++

Pointers, memory, STL and templates with a per-question language toggle.

Open track

GCP Data Engineer

BigQuery, Dataflow, Pub/Sub, Composer, IAM and cost optimization Q&A.

Open track

Why it's different

Graded on meaning, not string match

The mentor traces your logic line by line against the test data, so a different-but-correct solution still passes and a lucky guess doesn't.

Theory built around your question

Every question comes with a 7-part explainer — mental model, syntax patterns, schema strategy, an end-to-end trace, edge cases and a sanity checklist — plus animated flow diagrams.

Resume exactly where you stopped

Autosave checkpoints per subject. Close the tab mid-question, come back on another device, and your question and code are still there.

Who it's for

  • Students and freshers building fundamentals from zero
  • Data analysts and engineers moving into SQL / BigQuery / Spark roles
  • Backend and DSA candidates preparing for MNC and FAANG-style rounds
  • Working engineers with 30 minutes a day and an interview next month

Getting started takes a minute

  1. Step 1

    Create a free account with email or Google.

  2. Step 2

    Pick a subject, then pick the tab that matches your goal — Today for habit, Topic-wise for a weak area, Targeted before an interview.

  3. Step 3

    Solve, read the theory, review the AI feedback, and book a live mock interview when you're ready.

Start practicing today — it's free

Sign in once and your questions, code, theory and progress follow you across every device.

Create your free account Read the FAQ