12 Types of Developers: Who Does What and When to Hire Each

There are dozens of developer job titles, but if you're buying development work, only about 12 types of developers matter. Most of them build what users see (front-end), the logic and data behind it (back-end), or both (full-stack). The rest are specialists in mobile apps, infrastructure, data, AI and technical leadership, and the right choice depends on the job rather than the title on someone's profile.

I'm a freelance full-stack developer based in Denmark, so factor in that bias. I've tried to be just as clear about the jobs where you should hire someone other than me.

The short answer: which developer for which job

Treat the cost column as a rough, relative guide. Seniority shifts the price more than the type does, which I cover further down. If you have a specific project and want a quicker route, my decision guide to what kind of developer you need works through it by project type.

The core three: front-end, back-end and full-stack

Almost every web project has two layers: what people see and click, and what happens behind the scenes. The first three types are defined by which layer they work in. I go through the differences in more depth in front-end vs back-end vs full-stack.

1. Front-end developer

A front-end developer builds everything that runs in the user's browser: buttons, forms, navigation and layouts that have to work on a phone as well as a large monitor. The tools are HTML, CSS and JavaScript, usually with a framework such as React or Vue.

Hire a specialist front-end developer when the interface is the difficult part. Think drag-and-drop tools, dashboards full of charts, or a product where accessibility is a legal or contractual requirement. If you already have a back-end or an API, a front-end developer can build the interface on top of it.

On their own, they're the wrong hire if your project also needs a database, user accounts and integrations. A front-end developer also isn't a designer. Plenty can do a bit of both, but if you need user research and a visual identity, think about whether to start with a designer or a developer.

Pure front-end work usually sits at the lower end of the market because more developers can do it. That changes quickly for senior specialists working in large React codebases.

2. Back-end developer

The back-end developer builds what users never see: the database, business logic, permissions, payments and APIs (the agreed interfaces that let systems talk to each other). Common languages and frameworks include PHP with Laravel, Node.js, Python, Java and C#.

Bring one in when the hard part is data and rules. That might be syncing your online store with an accounting tool like Xero, a pricing engine with lots of exceptions, or a system where users with different roles work on the same records. Back-end mistakes are expensive because they hit your data rather than only the screen.

A back-end developer alone is a poor fit when the interface is a big part of the project. Most can build something that works, but not necessarily something people enjoy using.

Rates tend to fall in the middle to upper part of the range. Solid experience with security, data modeling and integrations is less common, and it shows in the price.

3. Full-stack developer

A full-stack developer works across both layers and can build a web application from database to interface. It's also the most common role: in the 2025 Stack Overflow Developer Survey, 27% of respondents described themselves as full-stack, against 14.2% back-end and 4.3% front-end.

For a small or mid-sized company, a full-stack developer is often the most efficient hire. One person understands the whole system, nothing gets lost in handovers between layers, and you have a single point of contact. It suits customer portals, booking systems, internal tools and first versions of SaaS products well.

The trade-off is depth. A full-stack developer is rarely as strong in every layer as two specialists would be, and at some point one person becomes a bottleneck. I've written about when one full-stack developer is enough and when it's time to grow the team.

This is my own role, working with Laravel and React/Next.js, so it's where I fit best. Rates sit in the middle to upper range, but you skip the coordination overhead, so the total often ends up lower than paying two specialists.

Developers defined by a platform

The next four types are defined by the platform they build on rather than the layer they work in. This is where it's easiest to buy the wrong thing, because the platform often gets picked before anyone has described the job.

4. WordPress and CMS developer

A CMS developer builds websites in a content management system, so your team can edit pages without touching code. WordPress is the most widespread, and there are headless options such as Sanity and Strapi, where content lives in one place and can be shown anywhere. The work covers themes, plugins, speed, technical SEO and setting up the editing experience.

It's the right call when what you need is a website: a company site, a blog, landing pages and contact forms. A good WordPress developer can often deliver faster and for less than someone building from scratch.

It's the wrong call when the website is slowly turning into a system with logins, customer data and business logic. That's when you end up with plugins fighting each other. I've covered the limits in more detail in when to hire a WordPress developer.

Prices are usually low to medium. It's a big market and quality varies widely, so look at sites they've actually built and check how fast those sites load.

5. E-commerce developer

An e-commerce developer builds and customizes online stores, typically on Shopify or WooCommerce (the store extension for WordPress). The work covers themes, checkout, shipping, VAT handling when you sell across borders, and connections to inventory and accounting.

Hire one when you sell physical or digital products and your business fits a standard store. Most do. The platform handles payments, security and order management, and the developer adapts the rest.

It's a poor fit when your business doesn't look like a normal store: subscriptions with complicated rules, customer-specific B2B pricing, or a marketplace with many sellers. Then you're fighting the platform, and custom software from a back-end or full-stack developer can end up cheaper over time.

Standard jobs are usually low to medium cost, and the price climbs quickly as integrations pile up.

6. Framework specialist (e.g. Laravel developer)

Some developers define themselves by a single technology: Laravel developer, React developer, .NET developer. It means they know that framework (a ready-made foundation for building software) in depth, including its pitfalls and the tooling around it.

A specialist is worth choosing when you already have a codebase in that technology. If someone needs to take over, upgrade or extend an existing Laravel application, you want a person who knows Laravel well, not someone learning it on your budget. The same goes when you've picked a technology for a good reason, for example because your team already knows it. Laravel is my own specialty, and I've written up what a Laravel developer does.

Specialization matters less when you're starting from scratch with no preference. Then it's more important that the developer can pick a sensible technology and explain why. Be wary of anyone who only knows one tool and therefore uses it for everything.

Rates are medium to high and depend more on experience than on the framework itself.

7. No-code and low-code developer

A no-code developer builds apps, internal tools and automations in tools like Bubble, Webflow, Make or Zapier, where much of the work happens in a visual editor instead of code. AI app builders such as Lovable, which generate apps from text prompts, belong in roughly the same category.

It's a good choice when you want to test an idea quickly, automate workflows between tools you already use, or build an internal tool for a small team. You can often have something working within days or a few weeks.

You hit the ceiling when the product needs to grow, handle complex permissions or process sensitive data. You become dependent on the platform's pricing and limits, and the result can rarely be moved elsewhere. I've written about what no-code developers can do and where it stops.

Hourly rates are usually lower, and a first version often costs far less than custom code. The bill arrives later if everything has to be rebuilt.

Specialists for mobile, infrastructure, data and leadership

The last five types are specialists. They're essential on the right projects, but most small and mid-sized companies don't need them on day one.

8. Mobile app developer

A mobile app developer builds apps people install from the App Store and Google Play. There are three routes: native development in Swift for iOS and Kotlin for Android, cross-platform development where one codebase covers both (React Native or Flutter, for example), and web apps that run in the browser but can feel like an app.

Hire one when your product depends on phone features like the camera, GPS, Bluetooth or push notifications, or when your users expect to find you in an app store. If the app has to be native, pick someone who has shipped apps to both stores before.

Many companies don't need an app at first. A web app that works well on mobile can often do the job for a fraction of the cost, without app store reviews. I compare the three routes in native, cross-platform or web app developer.

Costs are medium to high. Native apps for both platforms are the most expensive option because you're effectively building twice.

9. DevOps and cloud engineer

A DevOps engineer keeps the software running: servers or cloud setups on AWS, Azure or Google Cloud, automated testing and deployment, monitoring, backups and infrastructure security. If you serve European customers, they can also make sure data stays in EU regions where that's a requirement.

The role becomes relevant when your infrastructure is complex or business-critical: many servers, round-the-clock uptime requirements, several developers shipping code every day, or customers and regulators asking for documented security.

For most smaller web apps, a dedicated DevOps engineer is more than the job needs. Modern hosting platforms handle much of the heavy lifting, and an experienced full-stack developer can set up sensible operations. I've looked at whether a small company needs a DevOps engineer separately.

DevOps skills are among the most expensive, but you often only need them in bursts, for example during setup and an annual review.

10. AI developer

An AI developer builds features on top of existing language models from providers like OpenAI, Anthropic or Google, using their APIs. Typical examples are a chatbot that answers from your own documentation, automatic triage of support requests, or pulling data out of documents.

It's the right hire when you want AI inside a product or workflow. Most of the work is ordinary software development: data, permissions, error handling, cost control and testing whether the answers are good enough. In the EU, sending customer data to a model provider also raises GDPR questions, so ask how they handle that.

The title is new and used loosely, so be critical. Ask what they've put into production, not what they've experimented with. An AI developer also usually doesn't train their own models. That's a different type, covered next.

Rates are typically medium to high. Remember the ongoing usage fees for the models too, which grow with volume.

11. Data and ML engineer

A data engineer builds the pipelines that move and combine data, for example from your business systems into a data warehouse where it's cleaned and ready for reporting. An ML (machine learning) engineer trains, tests and runs custom models for things like forecasting or image recognition.

You need them when you have large amounts of data and a specific question it should answer, or when off-the-shelf AI models can't solve the problem well enough. I break down how they differ from an AI developer in AI developer vs ML engineer.

Most smaller companies shouldn't start here. If your data isn't in order yet, an ML engineer has nothing to work with. Start by getting data into one place and framing the question clearly.

Experienced ML engineers are among the most expensive profiles on the market.

12. Fractional CTO or software architect

A fractional CTO is an experienced technical leader you hire for a few hours a week or month. A software architect plays a similar role, focused on how the system should be structured. Neither necessarily writes much code. They help you choose technology, assess quotes, hire developers and say no to the wrong things.

The role fits when big technical decisions are coming and nobody in the company can judge them: before you spend serious money on a new system, when you're hiring your first development team, or when an investor wants a technical review. I explain the role in more depth in what a fractional CTO is and whether you need one.

If you have one well-defined project and a developer you trust, it's often overkill. An experienced developer who acts as a technical partner rather than a vendor can cover much of the need.

The hourly rate is high, but you buy few hours, and one good early decision can save far more than it costs.

What each type of developer costs in Europe

The freelance platform Lancebase publishes indicative hourly rates for Western Europe based on freelancers in its own database. They're a useful benchmark, not a price list:

Seniority is the other big lever. LønRadar's overview of Danish freelance IT rates puts juniors at DKK 400-600 an hour and specialists or architects at DKK 1,000-1,600, which is roughly €55-215 across the whole range. The page doesn't explain its method, so treat those figures as a ballpark too. UK contractors usually quote a day rate instead, so divide by the hours in their working day to compare.

Beyond seniority and role, three things drive the price:

• Responsibility: will the developer own architecture, operations and security, or work through a task list?
• Engagement model: a freelancer, an agency and an employee cost different amounts even for the same kind of developer.
• Scope: an unclear brief costs more, no matter who picks it up.

The hourly rate isn't the whole bill either. A senior at twice the rate is cheaper than a junior as soon as they need less than half the hours. I compare total costs in more detail in my breakdown of what a developer costs and in my post on junior vs senior developers in practice.

Seniority and hiring model matter more than the title

Developer titles aren't protected, and they overlap. A "web developer" can be anything from a WordPress specialist to a full-stack developer. A "software engineer" might do exactly the same work as a back-end developer. And since full-stack is the most common title, it says little about depth on its own.

Three questions tell you more than any title:

1. What has the developer built and kept running, and does it resemble your project?
2. How senior are they, and who makes the technical decisions along the way?
3. How do they work: as a freelancer, inside an agency or software house, or from another country and time zone?

That last question shapes cost, risk and day-to-day collaboration. A developer on Central European Time shares most office hours with the UK and the rest of Europe, while the overlap with the US East Coast is limited to a few hours of the American morning. I've compared the main options separately: freelancer vs agency, freelance vs full-time developer, software house vs agency vs consultancy and the pros and cons of offshore development.

AI coding tools have changed the work as well. They make a good developer faster, but they don't replace someone who understands the problem. I look at where that line sits in my post on whether AI can replace a developer. If you're considering hiring in the Nordics, I've also gathered software developer statistics for Denmark.

Next steps: match the job to the developer

You don't need to memorize all 12 types. You need to describe your project well enough that the hard part becomes obvious:

1. Write a few paragraphs on who will use the product, what it must do and which systems it has to connect to.
2. Find the hard part: interface, data, infrastructure, app stores or AI. That points to the type.
3. Choose the smallest combination that covers the hard part. For many web projects, that's one full-stack developer.
4. Ask about specific projects and experience, not titles.

My services overview shows the kind of work I take on, from websites to SaaS products and maintenance of existing systems. For larger builds, I start with a paid, fixed-price discovery phase so the scope is agreed before anything gets built, and you own the code from day one. If your project is a better fit for a different type of developer, I'll tell you.

Frequently asked questions

What's the difference between a developer and a software engineer?+

In practice, usually very little. Both titles describe people who design and write software, and companies use them interchangeably. Some organizations reserve "engineer" for roles with more responsibility for architecture and reliability, but there's no consistent rule. When you're hiring, look at what the person has built and maintained rather than which of the two words they use.

What's the difference between a web developer and a software developer?+

A web developer builds things that run in the browser and on web servers, while software developer is a broader term that also covers desktop programs, mobile apps and embedded software. The line is blurry, and many software developers work mostly on the web today. For a web app or customer portal, experience with comparable web projects is what counts.

Is a contractor the same as a freelancer?+

Mostly, yes. Both are self-employed developers you hire for a defined period or project. In the UK, "contractor" often means someone embedded in your team for months on a day rate, while "freelancer" more often means project-based work. UK off-payroll rules (IR35) can affect how contractors are engaged, so check with an accountant before you sign.

Should I hire several types of developers for one project?+

Only when the job requires it. Start with the type that covers the hardest part of your project, then add specialists for the periods you need them, such as a DevOps engineer to set up hosting. If several developers work in parallel, one person needs to own the technical overview and make sure the pieces fit together.