How to Onboard Onto a New Codebase in 20 Minutes Instead of 2 Weeks

theduckverse — Tue, 07 Jul 2026 16:12:09 +0000

Every developer knows the feeling. New job, new repo, 100k+ lines of code, and the person who wrote it left months ago. The README is three commands, all outdated. You spend your first two weeks just trying to figure out where things live.

I got tired of that, so I built a tool to fix it.

The problem with reading code top-to-bottom

When you open an unfamiliar codebase, the instinct is to start reading files. But you don't know which files matter. You waste hours in utility folders and config that teach you nothing about how the system actually works.

The fastest engineers I know do the opposite: they find the 5 files that carry the most meaning and read those first, in order. Entry point, then core domain logic, then the riskiest / most-changed files.

Project MRI does this automatically

Point it at a repo and it gives you:

The 5 files to read first — in the right order
An architecture diagram — how the pieces connect
A risk radar — the most fragile, most-changed files that break things
A health score — how much technical debt you're inheriting

No signup for the demo. Try it on any public repo: https://projectmri.com

Try it on a repo you already know

The best test: run it on a codebase you know cold. Does the "read these first" order match how you'd actually onboard a new teammate? That's the bar.

If you inherit codebases for a living, the full version is $99: https://projectmri.com

Would genuinely love feedback on where the file-ordering gets it wrong — that's what I'm tuning right now.

I got tired of opening a 100,000-line codebase and asking "Where do I even start?" — so I built Project MRI

theduckverse — Thu, 25 Jun 2026 14:44:25 +0000

The hardest part of software engineering isn't writing code. It's inheriting it.

You join a new team. Someone hands you a repo with 100,000 lines across 800 files. No docs. The person who wrote it left 8 months ago. And you're expected to ship something by Friday.

So you do the thing we all do: open main.js, scroll, feel lost, open another file, feel more lost, and quietly panic.

I got tired of that feeling. So I built Project MRI — it reads any codebase and tells you exactly how to understand it.

What it actually does

You point it at a repository (or upload a ZIP), and in a couple of minutes you get:

📖 5 Files to Read First — the exact reading order, the real entry points, and a safe-to-ignore list so you don't waste hours in generated or dead code.
🗺️ Architecture Diagram — an auto-generated visual of how the system is actually wired together.
⚠️ Risk Radar — a ranked list of the riskiest files by complexity and dependency count (the ones that'll break when you touch them).
💯 Repository Health Score — a weighted 0–100 score across tests, code quality, architecture, and technical debt.

It works with React, Next.js, Express, Django, Spring Boot, Laravel, and more.

Why I think this matters

Onboarding onto an unfamiliar codebase is one of the biggest silent time-sinks in our industry. Teams lose weeks per new hire. Consultants bill hours just orienting themselves. Solo devs inherit legacy projects and drown.

Project MRI turns "where do I even start?" into a 5-minute answer.

Try it right now — free

There's a live demo on a real API you can explore without uploading anything, and you can analyze your own repo free:

👉 projectmri.com

If you've ever stared at an unfamiliar repo wondering where to begin, I'd genuinely love your feedback. What would make this a must-have in your workflow?

DEV Community: theduckverse