GenQuest is an AI mock interview platform. You practice with a voice AI interviewer that can use your resume and a job description, ask adaptive follow-up questions, show a live transcript, and generate a scored interview report.

How does the AI mock interview work?

Start an interview session, speak your answers out loud, and the AI asks follow-ups based on what you say, your resume, and the role. When you finish, you get feedback across communication, technical depth, confidence, and completeness.

Can I practice coding, behavioral, and system design interviews?

Yes. GenQuest supports technical and coding-focused practice, behavioral questions, system design style probes, brush-up skill drills, and final-round style sessions.

Is the AI interview free to start?

Yes. You can start practicing without a credit card. Paid options may apply for heavier usage later.

Does GenQuest only do interviews?

Mock interviews are the core product. GenQuest also includes supporting tools like resume ATS scoring, JD match, and cover letter help so you can prep the full job path.

Full-Stack Developer Roadmap 2026: What to Learn and in What Order

By Preeti Verma

A full-stack developer builds both sides of a web application: what the user sees and what runs behind it. The role is popular because small teams and startups value people who can take a feature from idea to deployment.

It is also overwhelming to learn, because the list of technologies is long. This roadmap puts them in order, explains why each step matters, offers three stack choices and gives a nine-month plan. The aim is not to master everything, it is to become useful across the whole path from browser to database.

What "full-stack" really means

You do not need to be an expert at everything. In most jobs, a full-stack developer:

Builds user interfaces that work on phones and desktops.
Builds APIs and business logic.
Designs and queries a database.
Handles login and permissions.
Deploys the app and reads logs when it breaks.

Most people are stronger on one side. That is normal. Employers want enough depth on both to work independently.

Step 1: web fundamentals

Before frameworks, learn how the web works:

HTTP: requests, responses, methods, status codes, headers and cookies.
How a browser loads a page: DNS, requests, rendering.
Basic networking vocabulary: client, server, API.

This explains almost every confusing bug you will meet later.

Step 2: HTML, CSS and responsive design

HTML: semantic structure, forms, accessibility basics such as labels and alt text.
CSS: the box model, flexbox, grid, spacing, typography and media queries for responsive layouts.

Build three static pages from scratch: a landing page, a form page and a responsive layout. Good CSS is a real, valued skill, not decoration.

Step 3: JavaScript, then TypeScript

JavaScript is the language of the browser. Learn it properly:

Variables, functions, arrays and objects.
Array methods such as map, filter and reduce.
Asynchronous code: promises and async/await.
The DOM and events.
Modules, and error handling.

Then learn TypeScript, which adds types. Many teams use it for larger projects because it catches mistakes early.

Step 4: a frontend framework

React is the most common choice in job listings, with alternatives such as Vue and Angular also widely used. Pick one and learn it deeply:

Components and props.
State and effects.
Forms and validation.
Routing.
Fetching data from an API, with loading and error states.
Basic state management for larger apps.
Testing components.

Build one interface that talks to a real API, with loading, empty and error states handled. That detail separates beginner work from professional work.

Step 5: choose a backend stack

You have three common options. Choose one and stay with it for the whole roadmap.

Option A: JavaScript or TypeScript on the backend (Node.js)

One language across the stack makes the first year simpler. Learn a framework such as Express or a more structured one, plus middleware, validation and error handling.

Option B: Java with Spring Boot

Common in enterprise and banking roles, and a strong fit if you plan to work at large companies. Learn Spring Boot, REST controllers, dependency injection and JPA. See our Java backend roadmap.

Option C: Python with Django or FastAPI

Good if you also want data or AI work. See our Python developer roadmap.

Whichever you choose, learn:

REST API design: resources, methods, status codes, pagination and versioning. See our REST API design guide.
Request validation and consistent error responses.
Layered structure: controllers, services and data access.
Configuration through environment variables.
Logging.

Step 6: databases

Learn SQL properly, since most products use a relational database.

Tables, keys and relationships.
Joins, grouping and indexes.
Transactions.
Basic design and normalisation.
An ORM for your stack, and its pitfalls such as the N+1 query problem.

Then learn one non-relational option, such as a document database or Redis for caching, so you know when each fits. See our SQL guide and Redis caching guide.

Step 7: authentication and security

Almost every real application needs login. Learn:

Password hashing (never store plain passwords).
Sessions versus token-based authentication.
Authorisation: who may do what.
Common attacks and their defences: SQL injection, cross-site scripting, cross-site request forgery.
HTTPS, and handling secrets safely.

Our Spring Security and JWT guide is useful even if you use another stack.

Step 8: testing

Unit tests for business logic.
API tests for endpoints.
A few end-to-end tests for critical user flows.

You do not need to test everything. Test what would hurt if it broke.

Step 9: Git, collaboration and tooling

Branches, pull requests, code review, resolving conflicts and writing clear commit messages. Learn your editor's debugger and the browser developer tools. These save hours every week.

Step 10: deployment and operations

Docker to package your app.
A hosting platform or a cloud provider to run it.
A CI/CD pipeline to test and deploy automatically.
Logs and monitoring so you can see what happens.
Environment configuration for development, testing and production.

If you use Java, see our AWS for Java developers roadmap. Always set a spending alert when practising on a cloud platform.

Step 11: basics of system design

You do not need advanced system design to start, but understand caching, load balancing, queues, database indexing and the trade-offs between simplicity and scale. Our system design for beginners guide is a good start.

A nine-month plan

Assuming about 10 to 15 hours a week:

Months 1 and 2: web fundamentals, HTML, CSS and JavaScript. Build three static pages and one small interactive project.

Month 3: TypeScript and Git. Start a frontend framework.

Month 4: build a frontend app that uses a public API.

Months 5 and 6: your chosen backend, REST APIs and SQL. Build your own API and connect your frontend to it.

Month 7: authentication, validation, security basics and tests.

Month 8: Docker, deployment and CI/CD. Deploy a complete application.

Month 9: a second, more ambitious project, a polished README, a resume and job applications.

Projects to build

A task manager with login, user-specific data and filters.
An expense tracker with charts and monthly reports.
A booking or reservation app with availability rules.
A small product with real users, even a handful.

See our guide to the top 10 real-world projects for computer science students for more detail.

A resource tip

roadmap.sh publishes community-driven developer roadmaps that you can use to cross-check your plan. Treat any roadmap as a map, not a rulebook: you do not need to tick every box before applying for jobs.

Interviews for full-stack roles

Expect a mix: JavaScript or your backend language fundamentals, a frontend question (state, rendering or CSS layout), API and database design, a small coding problem and a project walkthrough. Practise explaining the whole flow of a request, from a button click to the database and back. The GenQuest AI mock interview helps you practise spoken answers, and you can check your resume against the job description before applying.

Common mistakes

Learning five frameworks lightly. Depth in one stack beats breadth.
Skipping fundamentals (HTTP, SQL, JavaScript) for the framework of the month.
Building only frontends with fake data. Build a real backend.
Ignoring security until it is too late.
Not deploying. A live app is worth far more than local code.
Tutorial hopping. Build something of your own.

How a request flows through a full-stack app

Understanding one complete flow explains most of the stack. Take "add a task" in a task-manager app:

The user clicks "Add." The frontend component collects the form data and checks it (for example, the title is not empty).
The frontend sends an HTTP request, such as POST /api/tasks with a JSON body and an authentication token.
The server receives the request, and a middleware or filter checks the token to identify the user.
The controller validates the data and passes it to a service layer, which applies the business rules (for example, a free user may have only 50 tasks).
The data layer runs an SQL insert in a transaction, linked to the user's ID.
The server returns a response, typically status 201 with the created task.
The frontend updates its state and shows the new task, or shows an error message if something failed.

At every step something can go wrong: a network error, an expired token, a validation failure, a database constraint. Good full-stack developers think about each failure, and you can practise by writing down, for one feature, what the user should see in each case.

A starter folder structure

Having a predictable layout keeps projects tidy. One common arrangement for a project with a separate frontend and backend:

my-app/
  frontend/        user interface (components, pages, api client)
  backend/
    controllers/   request handling and validation
    services/      business rules
    repositories/  database access
    models/        data definitions
    tests/
  docker-compose.yml
  README.md

The names change between frameworks, but the idea stays the same: keep request handling, business rules and data access separate. It makes code easier to test, and it is the structure interviewers expect you to describe.

What to put on your resume for a full-stack role

Recruiters scan for evidence that you can work across the stack. A strong project entry names the frontend, the backend, the database and where it runs, and states one concrete result. For example: "Built a task manager with React, a Node.js REST API and PostgreSQL. Added token-based login, input validation and tests for the core endpoints. Deployed with Docker, with a live demo." Link the repository and the live site.

List skills in groups (languages, frontend, backend, databases, tools), and keep to the ones you can discuss. Match the wording of the job description where it is honest, and check it with the free ATS resume checker.

Frequently asked questions

Should I learn frontend or backend first?

Most beginners find frontend more visual and motivating, so starting there is common. Either order works, as long as you finish both.

Is full-stack harder than specialising?

You learn more topics, but at less depth in each. Many developers start full-stack and specialise later.

Which stack is best for getting hired?

The one that matches the jobs you are applying to. Look at 20 job descriptions in your target city and choose the most common stack.

Do I need a degree?

Many employers care most about projects and fundamentals, but some set degree requirements, so check each role.

The takeaway

Learn the web fundamentals, then HTML, CSS, JavaScript and TypeScript, one frontend framework, one backend stack, SQL, authentication, testing and deployment, in that order. Build two real projects and deploy them. Being useful across the stack is the goal, not knowing every tool.