What Does a Web Development Company Do? Services Explained

This guide is intended to inform you about what to consider when you hire a web development company. It covers the core services you can expect as standard, the optional add-ons that vary by agency, and the work that falls outside its scope, so you know when you need a different specialist.

What core web development services do these specialists provide?

Front-end development

Front-end development creates what your visitors actually see: layouts, navigation, buttons, forms, and animations. Developers build this in HTML, CSS, and JavaScript, usually within a framework like React, Vue, or Angular.

One thing to clarify upfront: front-end development implements a design; it does not create one. If you don't have design files ready, confirm whether the agency handles design too or whether you need to source it separately.

Back-end development

The back end is what happens behind the scenes: servers, databases, and business logic. Notably, not every site needs custom back-end work. A simple informational site running on a content management system (CMS) often doesn't. But if your site involves user accounts, real-time data, or any complex logic, it does.

Popular languages for back-end development include PHP, Python, Node.js, and Ruby.

CMS development

A CMS lets your team update content (text, images, pages) without touching code. The agency builds or configures the system and connects it to your site. Common platforms are WordPress, Drupal, and Craft CMS.

ECommerce development

ECommerce development refers to the creation of an online store with product pages, shopping carts, payment gateway integration, and order management. This is typically scoped as its own project type because it involves more complex functionality.

Inventory management integrations, subscription billing, and multi-currency support are usually scoped and priced separately.

Integration and API development

Integration work connects your site to external systems such as CRMs, payment processors, shipping providers, and marketing tools. Most of this runs through REST or GraphQL APIs, while older systems may require custom middleware built around them.

Notably, integrations are one of the most common sources of cost overruns. Before you brief anyone, list every external system your site needs to connect to and make sure each one is scoped and priced individually.

Quality assurance and testing

Before handover, a web development company tests the site across browsers, devices, and screen sizes to catch bugs, broken links, and functional errors. This is part of every professional build and should not be listed as an add-on.

What additional services can a web development company provide?

These services are offered by many website development companies but are not part of a standard package. Confirm whether they are in scope before briefing.

• Search engine optimization (SEO). Technical SEO refers to the structural elements of a website that affect its visibility in search engines: URL structure, metadata, page speed, crawlability, and schema markup. Some web development agencies include a technical SEO audit and basic implementation in their builds; others do not.
• Website hosting and domain management. Some agencies manage hosting on your behalf, either through their own infrastructure or a third-party provider. Others hand over the codebase and expect you to arrange hosting independently. Hosting managed by the agency usually comes as a monthly retainer and includes uptime monitoring, security patches, and backups. If the agency does not offer this, you will need to source it elsewhere in order to launch.
• Web application development. This is where web development gets more complex. Web applications are browser-based tools that extend beyond a standard site with booking systems, client portals, dashboards, and internal tools. Common stacks include Python with Django, Node.js with React, and Ruby on Rails.
• Ongoing maintenance. A maintenance retainer covers routine updates, security patches, bug fixes, and minor content changes after the site launches. This is common but not universal. If you need guaranteed response times for technical issues after launch, ask for a retainer with clearly defined service levels before you sign the main contract.
• Website migration and redesign. Migration moves an existing site to a new platform or hosting environment; redesign rebuilds the visual and structural layer while retaining or transferring existing content. Both are standard project types for web development agencies, but they require more discovery work.

What a website development company does NOT do

It's important to be clear on where web development ends and where other disciplines begin. Hiring a web development agency and expecting these deliverables can lead to unplanned spending.

• Brand identity and logo design belong to a branding or graphic design agency. A web development company can implement your existing brand, but it rarely builds it from scratch.
• Creation of blog posts, product descriptions, or web copy is content marketing work, not development. Some agencies have copywriters on staff, but the majority do not.
• Paid media and advertising across Google and social media platforms fall under a digital marketing or performance marketing agency.
• Native mobile app development (iOS/Android apps built for app stores) is a separate discipline with different tools and specialists. A responsive website is not an app.
• Video materials and visuals are typically sourced separately. Web development companies can embed your media assets, but they generally do not produce them.

How to match an agency's services to your needs

Before you request a proposal, get specific. Ask yourself:

• Are you building a brochure site, a transactional store, or a platform with user accounts? The price difference between these is significant.
• Do you need the agency to handle hosting and maintenance after launch, or do you want a clean handover and full code ownership?
• Is your timeline driven by a hard deadline, or is it flexible? Agencies charge a premium for urgency.
• Do you have brand guidelines and copy ready to hand over, or will the agency need to wait on you?
• The clearer you are about the scope upfront, the more accurate your proposals will be, and the less likely you are to pay for work you do not need.

Ready to find a website development company that meets your needs? Browse DesignRush's web development directory and filter agencies by budget, specialty, and client reviews.