Full Stack Developer (MERN)
A MERN developer builds a whole web product in one language: React screens in the browser, an Express API on Node.js, and MongoDB underneath.
- Turn a design into React components that fetch and update data
- Add API routes in Express, with validation and authentication
- Model data in MongoDB and keep queries fast
- Ship features end to end, from the button to the database
- A React app with routing, forms and state
- A REST API in Express with sign-in
- A full product deployed end to end
Where it leads: Senior full stack, frontend or backend specialist, or a tech lead on a small product team.
Every skill, at the level the job needs
Updating… · change the level or company to see how it shifts
full-stack
core- HTML
- CSS
- npm
- Git commands
- Starting with git
- Tailwind
javascript
core- Declaring variables
- let
- const
- Introduction to JavaScript
- Hoisting
- Naming variables
nodejs
core- What is Node.js?
- Why use Node.js?
- History of Node.js
- Node.js vs Browser
- Running Node.js Code
- Modules
react
core- Vite
- Functional Components
- JSX
- useCallback
- useRef
- useState
git-github
core- git init
- What is Version Control?
- Why use Version Control?
- git config
- Local vs Global Config
- Git
mongodb
core- BSON vs JSON
- SQL vs NoSQL
- Embedded Objects & Arrays
- Introduction to MongoDB
- What is MongoDB
- Double
datastructures-and-algorithms
core- JavaScript
- Language Syntax
- Control Structures
- Pseudocode
- Pseudocode basics
- Functions
What the levels mean
- L1 · AwareKnows what it is and when it's used
- L2 · BasicsCan use it with guidance
- L3 · WorkingUses it independently on the job
- L4 · StrongHandles hard cases, reviews others
- L5 · ExpertDesigns with it, teaches it
Interviews, by kind of company
Your route adds an interview track that matches the company you choose.
Large IT services firms: aptitude, fundamentals, technical and HR rounds.
Online assessment, coding rounds, a design round.
Hard timed coding rounds, system design, behavioural interviews.
Questions
What does a Full Stack Developer (MERN) need to know?
Full Stack Developer, JavaScript Roadmap, MongoDB, Node.js Developer, React Developer at a working level, plus API Design, CSS, HTML, Learn Git and GitHub, TypeScript. The skills section above lists every one with its level.
How long does it take to become a Full Stack Developer (MERN)?
About 488 hours of study from scratch. At 10 hours a week that's roughly 49 weeks; anything you already know is skipped after the readiness test.
I already know some of this. Do I start from zero?
No. The optional readiness test finds what you already know and your route skips it.
Does the route change for product companies or senior roles?
Yes. Choose your level and the kind of company above: the skills and target levels adjust, for example deeper data structures and system design for product companies.
Other roles in the Full Stack track
They share many skills with this one, so progress carries over if you switch.
MongoDB, Express, Angular and Node.js.
Python back end with a React front end.
Spring Boot back end with a React front end.