Full Stack PHP Developer Interview questions

Full Stack PHP Developer Interview questions

By AuthorCrafts - 1 week ago

Interview  |  Job  |  Quiz  |  Technology

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Laravel & PHP Questions

1. What are Laravel Service Providers?

Answer:
Service providers are the central place to configure and bootstrap components in Laravel, such as registering services or bindings in the service container.

Example:
You create a custom service class App\Services\PaymentService. To register it in Laravel:

php
public function register() { $this->app->bind('PaymentService', function($app) { return new \App\Services\PaymentService(); }); }

You can now use resolve('PaymentService') anywhere in your app.

2. What is Laravel’s Service Container?

Answer:
Laravel’s service container is a powerful tool for managing class dependencies and performing dependency injection.

Example:
If a controller depends on a service:

php
class OrderController extends Controller { public function __construct(OrderService $orderService) { $this->orderService = $orderService; } }

Laravel automatically injects OrderService if it's bound in the container.

3. How does Laravel handle routing and middleware?

Answer:
Routes are defined in routes/web.php or routes/api.php. Middleware can be used to filter requests before they reach the controller.

Example:

php
Route::middleware(['auth'])->group(function () { Route::get('/dashboard', [DashboardController::class, 'index']); });

This ensures only authenticated users can access the /dashboard route.

4. What is the Laravel request lifecycle?

Answer:

  1. Request enters via public/index.php

  2. Kernel handles the request

  3. Middleware applied

  4. Route matched

  5. Controller executed

  6. Response returned

  7. Middleware runs again (for response)

5. How do you optimize a Laravel app for performance?

Answer:

  • Use route and config cache (php artisan route:cache, config:cache)

  • Use eager loading with Eloquent to avoid N+1 problems

  • Use Redis for caching

  • Defer heavy tasks to queues

Example:
To cache a product list:

php
$products = Cache::remember('products', 3600, function () { return Product::with('category')->get(); });

6. How does Laravel queue system work?

Answer:
Laravel uses queues to defer time-consuming tasks like sending emails. Jobs are dispatched and processed by a worker.

Example:

php
SendEmail::dispatch($user); // Pushes job to queue php artisan queue:work // Processes jobs

E-Commerce & API Integration

7. How do you integrate a payment gateway in Laravel?

Answer:
Use official SDKs or REST APIs. Handle transactions, webhooks, and callbacks securely.

Example: Stripe Integration

php
\Stripe\Stripe::setApiKey(env('STRIPE_SECRET')); $charge = \Stripe\Charge::create([ 'amount' => 2000, 'currency' => 'usd', 'source' => $request->stripeToken, 'description' => 'Order #1234' ]);

Also set up a webhook route to update order status.

8. How do you structure a Laravel app for a large e-commerce platform?

Answer:

  • Modular structure (Modules: Product, Order, Cart)

  • Repository pattern

  • Service classes for business logic

  • Events and listeners for async actions

Example:
Event OrderPlaced, listener SendOrderConfirmation.

php
event(new OrderPlaced($order));

Listener sends email, notifies warehouse, etc.

9. How do you integrate third-party APIs?

Answer:
Use Laravel's HTTP client (Http::get, Http::post) with retries and error handling.

Example:

php
$response = Http::retry(3, 100) ->get('https://api.example.com/products'); if ($response->successful()) { return $response->json(); }

AWS / Cloud Infrastructure

10. How do you deploy a Laravel application on AWS?

Answer:

  • Use EC2 for hosting

  • S3 for file storage

  • RDS for the database

  • Route 53 for DNS

  • Use CloudWatch for monitoring

Example:
Store images in S3:

php
Storage::disk('s3')->put('products/image.jpg', $file);

In .env:

ini
FILESYSTEM_DRIVER=s3

11. How do you secure Laravel on AWS?

Answer:

  • Use IAM roles and security groups

  • Store secrets in AWS Secrets Manager

  • Enable HTTPS using ACM + ALB

  • Keep packages updated and use Laravel’s built-in CSRF/XSS protections

MySQL & Performance

12. How do you optimize queries in Laravel?

Answer:

  • Use indexes

  • Avoid SELECT *

  • Use pagination

  • Use eager loading

Example:

php
$orders = Order::with('products')->paginate(20);

Avoids N+1 problem and limits data per page.

13. What are migrations and seeders?

Answer:

  • Migrations define DB schema versioning

  • Seeders populate tables with initial/test data

Example:

bash
php artisan make:migration create_products_table php artisan db:seed

Seeder:

php
Product::factory()->count(50)->create();

Front-End / Full Stack

14. How do you manage front-end in Laravel projects?

Answer:

  • Use Blade or Vue with Laravel Mix/Vite

  • Use Alpine.js or Vue for interactivity

  • Use components and slots

Example:

blade
<x-alert type="success" message="Product added successfully!" />

Custom Blade component makes views reusable and clean.

15. How do you handle API responses in Laravel?

Answer:

  • Use API Resources

  • Consistent JSON structure

  • Proper HTTP status codes

Example:

php
return response()->json([ 'success' => true, 'data' => new ProductResource($product), ], 200);

Leadership & Project Handling

16. How do you ensure code quality?

Answer:

  • Use code reviews and PRs

  • Run automated tests

  • Apply static analysis tools like Larastan

  • Use CI/CD pipelines

Example:
GitHub Action workflow for running tests:

yaml
- name: Run tests run: php artisan test

17. How do you mentor junior developers?

Answer:

  • Pair programming

  • Code reviews with explanation

  • Assign tasks gradually

  • Encourage documenting and testing

Example:
Walk a junior through the lifecycle of a request from route to response, and explain query optimizations.

Scenario-Based

18. What would you do during a production outage?

Answer:

  • Check Laravel logs (storage/logs)

  • Identify error and rollback if recent deployment

  • Restart queue workers

  • Notify stakeholders

  • Apply fix in staging, then deploy

19. How do you write tests in Laravel?

Answer:

  • Use php artisan make:test

  • Use factories for dummy data

  • Test both units and features

Example:

php
public function test_user_can_create_order() { $user = User::factory()->create(); $response = $this->actingAs($user)->post('/orders', [ 'product_id' => 1, 'quantity' => 2 ]); $response->assertStatus(201); }

interview  |  fullstack-developer  |  php-developer

Demodex And Acne
Demodex And Acne

Health & Wellness, Services

Melbourne, Melbourne, Australia

4 years ago

Justin James
Freelance Mobile APP Developer
Flutter | Dart | SQLite If you are seeking a skilled developer to build high-quality mobile apps using Flutter, you have come to the right place! With expertise in Flutter app development, I can help you create stunning, user-friendly, and performance-driven mobile apps for Android and iOS.
Email: justinjamesrdrgz@gmail.com

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