A guide to hiring a vanilla JS developer
Vanilla JS is plain JavaScript, written without a framework such as React or Vue. The code runs straight in the browser and uses the tools the browser already has. Teams choose it for light pages, small interactive features and sites that must load fast. This guide explains what a vanilla JS developer does, how the role differs from nearby jobs and how to work well with a remote engineer. It is most useful for founders, marketers and product owners who run a site and want it to feel quick.
What a vanilla JS developer is responsible for
A vanilla JS developer adds behaviour to web pages. That can mean a menu that opens on a phone, a form that checks input as someone types, a product filter, an image gallery or a calculator. They also look after the scripts that already run on your pages, remove what is no longer used and fix bugs that appear in one browser but not another. On a small team, one person may cover the page markup, styles and scripts together.
Why teams pick plain JavaScript
Every framework adds code that each visitor has to download and run. For a big app, that cost is worth it. For a marketing site or a handful of features, it may not be. Plain JavaScript sends only the code your page needs. It also has no framework version to upgrade, so the scripts tend to age well. The trade-off is that the developer must organise the code carefully, because nothing forces a tidy structure. That is why experience matters more here than it does with a framework.
How a vanilla JS developer differs from other roles
A JavaScript developer works across the browser and the server, often with TypeScript and a framework. A React developer or an Angular developer builds large apps on top of one framework. A Node.js developer writes server code. A web developer covers the full site, including design handoff and content. Use the vanilla JS page when your main need is plain browser code that stays small.
When a vanilla JS developer makes sense
- You run a content site, a shop theme or a landing page and want to add features without a heavy toolset.
- Your pages feel slow and you suspect scripts, plugins or old libraries.
- You still depend on jQuery and want to move away from it in small steps.
- You need a widget that can sit on many different sites, such as a booking box or a chat button.
- You want code that your next developer can read without learning a framework first.
If your product is a large app with many screens, shared data and a big team, a framework developer will usually serve you better.
Reading a vanilla JS developer’s background
Look for pages that real visitors used, not only demos. Ask what they built, how big the scripts were and how they tested it in different browsers. A good answer names a problem, the cause and the fix. Be careful with a background that lists many frameworks and gives no detail on the plain code underneath. Ask them to open the browser’s developer tools and walk you through how they would find a slow script.
Interview questions to try
- How would you build a menu that works with a keyboard and a screen reader, without a library?
- Describe a time you replaced jQuery code. How did you test that nothing broke?
- What is event delegation, and when would you use it?
- How would you load data with fetch and show a clear message when the request fails?
- A page feels slow because of scripts. What do you check first?
The best answers include a real example and a reason for each choice. Be wary of a person who gives the same answer to every question.
Try a paid mini project
Give each finalist a short, real task from your own site, such as a product filter, a sign-up form with clear error messages, or a review of one slow page with a list of fixes. Pay them for the hours. When you read the result, notice how tidy the code is, whether it works with a keyboard, and how well the person explains it to a non-expert.
Match the person to your project
A new site needs someone who can set a simple structure for the scripts from day one. An older site needs a careful reader who can find what each script does before changing it. A shop or a content site needs someone who watches page weight and loading speed. Job titles vary, so ask which parts of the site each candidate owned.
Agree access and routine
Agree the weekly hours up front and look at them again each quarter. Your engineer should sign in with personal accounts for the code host, the hosting panel and the test site, while your company stays the owner of every account. Ask for a brief note with each change that says how to undo it. When the work ends, close their access.
Working with your team
Let your team know from the first day which pages and features the engineer owns. Pass on design files, brand rules and a list of pages that already cause trouble. A weekly check-in and one shared task board are usually enough. Ask for comments in the code and a few lines on how each feature works, so the next person can take over.
Mistakes to avoid
- Adding a framework to a site that only needs a few small features.
- Copying scripts from the web that no one on the team understands.
- Skipping tests on phones and in older browsers.
- Letting one contractor hold the only login to your hosting or code host.
Need help across the browser and the server? Look at our JavaScript developers, or read about our web developers if you want one person for the whole site.