A guide to hiring an XPath developer
XPath is a small language that tells a program exactly which part of an XML or HTML document to read. It is used in data collection, in automated browser tests and in work with XML files and feeds. People rarely hire for XPath alone. They hire a developer who is very good at it and who uses it inside Python, JavaScript or Java code. Here is what the job includes, how to judge a candidate and how to work well with a remote engineer. It is most useful for founders and team leads who need data pulled from pages, tests that stop breaking or XML files put to use.
What XPath does
A web page or an XML file is a tree of elements. XPath is a way to write a route through that tree, for example to the price inside a product box or the second column of a table. Because the route can use names, text and relations between elements, one path can pick out a single item or a whole list. The result is exact, repeatable and easy to feed into other code.
The three jobs people hire for
The first job is data extraction. A company wants prices, listings or contact details from pages, and an XPath developer builds a scraper that collects them and saves clean results. The second job is test automation. Browser tests need a reliable way to find a button or a field, and good paths keep those tests steady when the design changes. The third job is XML work. Product feeds, sitemaps, invoices and many older systems use XML, and the developer reads, checks and converts it.
How an XPath developer differs from other roles
A software engineer builds whole products and may use XPath only now and then. An API developer connects systems, often through JSON, and handles XML when an older partner requires it. A test engineer plans what to check. An XPath developer is the person you bring in when finding the right element or data is the hard part. On a larger project the specialist often works next to one of these roles.
When an XPath developer makes sense
- You need data from web pages and no official feed or interface exists.
- Your automated tests fail often because they cannot find the right element.
- You receive XML feeds and need them cleaned, checked or converted.
- A scraper stopped working after a site changed and nobody knows how to repair it.
- You want to replace manual copying from pages with a repeatable process.
If an official interface already gives you the data, use it instead. It is usually more stable than reading a page, and a developer who says so is a good sign.
Check the rules first
Collecting data from a site is not always allowed. Terms of use, robots rules and privacy laws can all apply, and some data is personal. A careful developer asks about these points before writing any code. Decide with them which sites, which data and which volume of requests are in scope, and write it down. Please also get legal advice where the data is sensitive.
Reading an XPath developer’s background
Ask for examples where a path or a scraper kept working through a site change. Good answers explain what the path was based on and what the developer did to keep it steady. Be careful with a background that lists tools only. Pointing a tool at a page is easy, while building something that lasts needs judgement about page structure, timing and error cases.
Interview questions to try
- How do you write a path that survives small changes to a page?
- When would you choose a CSS selector instead of XPath?
- A page loads its content with JavaScript after the first view. What do you do?
- How do you find out that a scraper has quietly started returning bad data?
- How would you convert a large XML feed into a table for our team?
Listen for clear reasoning and real examples. Doubt anyone who answers with a long path copied from a browser and no explanation.
Try a paid mini project
Hand each finalist a small task from your own work. Useful examples are collecting a short list of fields from five pages, rewriting three brittle test selectors, or turning a sample XML feed into a clean table. Pay for the time. Look at how readable the paths are, how the person handles odd cases and how well they explain their choices.
Agree how the work is kept alive
Scrapers and selectors need care over time, because sites change. Agree who watches for failures, how you will be told and how fast a repair is expected. Ask for a short note beside each path that says what it selects. Keep the code and the collected data in accounts that your company owns, and remove access when the work ends.
Working with your team
Show your developer how the data will be used, who reads it and what a good result looks like. A short weekly call and a shared list of tasks keep everyone aligned. Share examples of pages that are hard, since those usually decide how much time the job needs.
Mistakes to avoid
- Using very long paths copied straight from a browser.
- Scraping a site without checking its rules or looking for an official feed.
- Having no alert when a scraper starts returning empty or wrong values.
- Keeping the only copy of the code on one person’s laptop.
Want to look at the wider role? See our software engineers for full product work, or our API developers for connecting systems.