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Symfony Use Cases

  • Building large-scale web applications:

    Symfony's modular architecture and built-in features for caching, security, and testing make it well-suited for building complex and high-performance web applications.

  • Creating APIs:

    Symfony has built-in support for creating RESTful APIs, making it a popular choice for building web services and microservices.

  • Content management systems (CMS):

    Symfony can be used to build custom CMSs for managing content on websites.

  • E-commerce platforms:

    Symfony provides tools and libraries that can be used to build e-commerce platforms, it can handle large number of products and process many transactions.

  • CRM systems:

    With Symfony it's easy to build enterprise level CRM systems.

  • Custom and bespoke software:

    Symfony can be used to build any kind of custom software, it provides vast libraries which can help the developer to build software faster.

Top Skills to Look For in a Symfony Developer

  • Strong knowledge of PHP:

    A Symfony developer should have a good understanding of the PHP programming language and its features.

  • Familiarity with the Symfony framework:

    A developer should have experience working with the Symfony framework, including creating controllers, routing, and working with the service container.

  • Understanding of web development concepts:

    A Symfony developer should be familiar with web development concepts such as HTTP, HTML, CSS, and JavaScript.

  • Knowledge of databases:

    The developer should have experience working with databases, such as MySQL or PostgreSQL, and be familiar with ORM tools such as Doctrine.

  • Experience with the command line:

    Symfony developers should be comfortable using the command line to manage the application and install dependencies.

  • Experience with Git and version control:

    A developer should have experience using Git for version control and be able to use common Git commands like committing, branching and merging.

  • Understanding of best practices for security and performance:

    A Symfony developer should understand common security issues and best practices for securing web applications and be familiar with techniques for optimizing the performance of a Symfony application.

  • Ability to work well with a team:

    Symfony developer should be able to work effectively with other developers, designers, and stakeholders in a team environment

  • Strong analytical and troubleshooting skills:

    A Symfony developer should be able to troubleshoot and debug application issues and have strong problem-solving skills.

  • Strong communication skills:

    A Symfony developer should have strong communication skills and be able to clearly explain technical concepts to non-technical stakeholders.

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Symfony Interview Questions

What are the major components of Symfony and what are their purposes?

Symfony has a set of reusable PHP components that power the framework and other applications:

– HttpFoundation: Represents HTTP messages with object-oriented classes.

– Routing: Manages URL routing and associates routes with controllers.

– EventDispatcher: Allows for decoupling components and modules using an event-driven approach.

– DependencyInjection: Provides a way to manage services and configurations.

– Console: Enables command-line interface tool creation.

– ORM (Doctrine): Provides a way to work with databases using Object-Relational Mapping.

– Twig: The default templating engine for rendering views.

What's the role of the service container in Symfony?

The service container (or dependency injection container) is a powerful tool in Symfony to manage object dependencies and configure and store instances of objects. It helps in achieving a decoupled and modular application architecture.

Describe the Symfony application flow when a request comes into the system

When a request hits a Symfony application:

  1. The front controller (“public/index.php”) handles the request.
  2. The HttpKernel handles the request to generate a response.
  3. Routing determines which controller should process the request.
  4. The EventDispatcher can trigger several events during request handling, allowing for customization at various points.
  5. The controller processes the request and returns a response, which gets sent back to the client.
How do you handle database migrations in Symfony?

Symfony uses Doctrine, which has a migrations mechanism. By using the “doctrine:migrations:diff” command, developers can generate migration files based on the difference between the current database schema and the entities. The “doctrine:migrations:migrate” command is then used to apply these migrations.

How would you create a custom Symfony command?

Create a class in the “Command” directory of a bundle or the main application. This class should extend “Symfony\Component\Console\Command\Command”. Define the command’s name, arguments, and options in the “configure” method, and the logic in the “execute” method.

What are Symfony Flex and Symfony Recipes?

Symfony Flex is a tool that automates mundane tasks when setting up or managing Symfony projects. Symfony Recipes are a set of automated instructions to integrate third-party packages into Symfony applications. Together, they simplify the process of adding and managing Symfony extensions.

How do you handle translations in Symfony?

Symfony has a built-in Translation component. You define translation keys and their corresponding translations in designated files (e.g., “.xlf” or “.yaml”). In templates, you can use the “trans” filter, and in PHP code, you’d use the “trans” method from the “Translator” service.

How is security managed in Symfony?

Symfony’s Security component provides authentication and authorization mechanisms. It includes firewalls, access control rules, roles, voters, and providers. The framework handles common vulnerabilities, ensuring protection against risks like SQL injection, CSRF, and session hijacking.

Explain the difference between a Symfony bundle and a Symfony component

A component is a set of related classes that add specific functionality with minimal dependencies. A bundle is a plugin or module for the Symfony framework that can bundle together multiple related components, configuration, and views to add functionality to Symfony applications.

How would you manage and share reusable code across multiple Symfony projects?

Create a custom Symfony bundle or a Composer package to encapsulate the shared functionality. This can then be imported and used in multiple Symfony projects.

What is the role of the profiler in Symfony?

The Symfony Profiler provides detailed debugging and performance metrics for a request-response cycle. It gives insights into routes, controllers, templates, database queries, forms, security, and more, helping developers optimize and debug their applications.

How do you handle sessions in Symfony?

Symfony’s “Session” component provides object-oriented access to session management. You can use the “Session” interface to set, get, and remove session variables, as well as control other aspects of the session.

Describe the purpose and usage of Symfony's MakerBundle

MakerBundle is a bundle in Symfony that facilitates rapid application development by generating boilerplate code for controllers, entities, forms, and more. It streamlines common tasks and reduces manual coding effort.

How do you handle form creation and processing in Symfony?

Symfony’s Form component allows for building, rendering, and handling forms. You can create a form class, bind it to an entity, render it in a template using form helpers, and handle submissions in a controller. It also supports data validation, CSRF protection, and form theming.

What is the difference between "dev", "test", and "prod" environments in Symfony?

These are different configurations and runtime environments in Symfony:

– dev: Used during development. Includes debugging tools and verbose logging.

– test: Used for running automated tests. Might mock certain services or have different database configurations.

– prod: Production environment. Optimized for performance, with minimal logging