Mukund Jha

Posted on Jun 14

I Built an AI That Understands My Entire Codebase—And It Changed Everything

The Moment That Changed Everything

It was 2 AM. My screen was flooded with 47 open files. I was trying to understand how authentication worked in a project I'd joined.

I asked myself: "How does this auth token actually get validated?"

I clicked through auth.js → middleware.js → database.js → config.js. Five files. Twenty minutes. Zero clarity.

Then I asked: "Wait, where is this function even USED?"

Another twenty minutes. Another ten files. My brain felt like it was running on 2% battery.

That's the moment I realized: Developers don't spend their time writing code. We spend it UNDERSTANDING code.

20–30% of every developer's week. That's 8–12 hours. Lost. Just trying to figure out what exists.
The Problem Nobody Talks About

Everyone talks about AI coders.

"Copilot will autocomplete your code!"

"Cursor will write functions for you!"

"AI will replace junior developers!"

But nobody asks:

"What happens when you join a 100K-line codebase and have to understand it in 3 days?"

Current AI tools are surface-level:

They autocomplete lines

They don't understand cross-file dependencies

They hallucinate when context is missing

I tried Copilot. I asked: "How does auth work?"

It gave me: "Check line 45 in auth.js."

That's not an answer. That's a pointer to another question.
The Breakthrough: What If AI Could Be a Senior Engineer?

I imagined something different:

"What if an AI could sit next to me and answer questions like a senior engineer who already knows the codebase?"

Not: "Check line 45."

But: "Auth works like this: The token flows from login() → validateToken() → database.getUser(). The expiry is 15 minutes because of security policy in config.js. Here's the full flow."

That's Lexithm.
What Lexithm Actually Does

Lexithm = AI Senior Engineer for Your Codebase

You ask:

"How does authentication work?"

"Where is validateToken used?"

"Explain this module."

"What changed in auth.js last week?"

Leixthm answers with:

Full cross-file context (not just one file)

Data flow traces (where functions are called)

Human-like explanations (like a senior dev explaining)

Real code references (lines, files, modules)

Examples:

text
Q: "How does auth work?"
A: "Auth flows: 1) User calls /login → 2) authController.login() validates credentials → 3) TokenService.generate() creates JWT → 4) Token stored in DB with 15-min expiry. See authController.js:45, tokenService.js:12."

Q: "Where is User model used?"
A: "User is imported in: 1) auth.js (login), 2) profile.js (getProfile), 3) admin.js (deleteUser). Total: 17 references across 5 files."

Q: "Explain validateToken"
A: "validateToken(token) checks: 1) Token exists, 2) Not expired, 3) Signature matches. Returns user object or throws error. Used in 3 endpoints: /profile, /admin, /settings."

This is not autocomplete. This is understanding.
How I Built It (From a 9th-Grade Bedroom in Nepal)

I'm Mukund Jha. I'm 14 years old. I'm in 9th grade. I live in Dipayal, Nepal—a small town with no tech giants, no startup incubators, no VC money.

My setup:

A laptop I'll upgrade after 10th grade (currently struggling)

Python + FastAPI (what I'm learning)

LLM APIs (NVIDIA NIM LLMS)

Vector DB for semantic search

3 months of late nights

Tech stack:

text
Backend: Python + FastAPI
AI: LLM APIs + AST parsing
Storage: PostgreSQL + Vector DB
Frontend: React/Next.js

I didn't have a team. I didn't have funding. I had a problem I felt every day and the stubbornness to solve it.
Why This Is Different (The Real Magic)
Copilot / Cursor Leixthm
Autocompletes lines Answers questions
Local file context Entire repo context
No cross-file tracing "Where is this used?" in sec
Hallucinates without context Real code references
"Check line 45" "Here's the full flow"

Lexithm thinks like a human senior engineer.

It doesn't just show code. It explains code.
The Impact: 5+ Hours/Week Saved

I tested Lexithm on my own projects:

Before: 2 hours to understand auth flow

After: 12 minutes with Leixthm

That's 10x faster.

For a developer working 40 hours/week:

8 hours/week lost on understanding code

With Lexithm: 2 hours/week

Saved: 6 hours/week = 1 full workday

That's the value.
It's Free. For Now.

I'm launching Lexithm free for everyone right now. No credit card. No limits (yet).

Why?

I need feedback to make it better

I need testimonials to prove value

I believe developers should access this tool without paying upfront

Try it: https://lexithm.vercel.app/

Ask: "How does [feature] work in this repo?"
The Future: What's Next

Lexithm is just the beginning. Here's what I'm building:
Week 1-2: CLI

bash
$ lexithm q "How does auth work?"
$ lexithm trace "src/auth.py"
$ lexithm explain "function_name"

Week 3-4: Code Review

bash
$ lexithm review
$ lexithm review --fix # Auto-applies fixes

Month 2: VS Code Extension

Click "Lexithm" in sidebar → ask questions

Daily use (developers open VS Code every day)

Month 3: Teams

Team dashboards

PR integration

Custom rules

Why You Should Care

If you're a developer:

You spend 20–30% of your time understanding code

You're frustrated with AI tools that don't give real answers

You want to ship faster, not debug slower

Lexithm solves this.

If you're building a startup:

Your team spends hours onboarding new devs

Your codebase grows, understanding gets harder

You lose time on READMEs, docs, explanations

Lexithm solves this.

If you're an engineer:

You want tools that save time, not add complexity

You want AI that understands, not just autocomplete

You want to focus on building, not deciphering

Lexithm solves this.
The Real Story: Why I Built This

I didn't build Lexithm to become rich.

I built it because I felt the pain.

Every time I joined a new project. Every time I open-sourced code. Every time I tried to understand a 100K-line repo.

I asked: "Why is this so hard?"

And I realized: It shouldn't be.

AI should be a senior engineer sitting next to you. Not a autocomplete bot showing line numbers.

Lexithm is my answer.
Join Me

I'm Mukund. I'm 14. I'm from Nepal. And I'm building the AI tool that every developer needs.

Try Lexithm: https://lexithm.vercel.app/

Feedback? I read every comment. DM me: jhamukunda2@gmail.com /

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