Why pre-screen senior WordPress developers before the technical interview
Senior work on this platform is mostly inherited: a site with forty plugins, a theme modified in place, and a core version nobody dares update because something will break. Add the near certainty of a compromise at some point and you have the real job. Developers worth hiring have cleaned up a hacked site properly. A short screen asks about that, which separates senior from experienced.
What actually matters when screening Senior WordPress Developer candidates
- 01
Technical proficiency
Test PHP depth beyond theme tweaks: custom post types, WP_Query performance, hooks and filters, REST API endpoints, Gutenberg block development in React, and WP-CLI usage.
- 02
Systems and trade-offs
Probe architecture choices: multisite versus separate installs, headless WordPress with Next.js, object caching via Redis, CDN and page cache layering, and plugin bloat decisions.
- 03
Evidence and rigour
Look for measured outcomes: Core Web Vitals or Lighthouse scores before and after, query counts reduced via Query Monitor, staging workflows, PHPUnit or Playwright coverage.
- 04
Collaboration and communication
Assess handoff with designers and editors: training content teams on ACF or block patterns, scoping client change requests, code review habits, documenting custom theme conventions.
Pre-screening questions to ask Senior WordPress Developer candidates
12 questions grouped by what they test. Ask the same set in every screen and score answers on a consistent scale, or send them as an async video screen and compare answers side by side.
Sites they support
3 questions01What is your experience developing themes from scratch?
Listen forThemes built with the template hierarchy used properly, and a build process rather than files edited live.
Themes assembled from a page builder, or template hierarchy not understood.
02How would you describe your experience developing plugins?
Listen forPlugins written with hooks used correctly, and update and compatibility handled across core versions.
Functionality added directly to a theme, or plugins that break on a core update.
03Can you describe a project using a multisite installation and your role in it?
Listen forMultisite used where it genuinely fits, with the shared user and plugin implications understood.
Multisite adopted without need, or the constraints it imposes on plugins not understood.
Handled a compromise
3 questions04How would you handle a site that has been compromised?
Listen forEntry point found and closed, with a clean rebuild from known good code rather than deleting the visible damage.
Malicious files removed with no entry point found, or the site restored from a possibly infected backup.
05How do you ensure the security of a site you build or maintain?
Listen forInput handling, file permissions and update discipline addressed, with plugin provenance reviewed.
Security described as a plugin, or unmaintained plugins left installed on a live site.
06How do you handle core and plugin updates on a live site?
Listen forUpdates tested on staging with a rollback path, and a schedule so sites do not fall years behind.
Updates applied directly to production, or updates avoided because something might break.
Diagnosed at query level
3 questions07What steps do you take to optimise site performance?
Listen forSlow queries and plugin overhead identified by profiling, with caching applied after the cause is fixed.
Performance work limited to installing a caching plugin, or no measurement before and after.
08What is your process for troubleshooting a slow or failing site?
Listen forA systematic approach through server, database and application, with query logs examined.
Plugins disabled at random, or problems escalated to hosting without investigation.
09Do you have experience with commerce functionality on this platform?
Listen forCommerce work including checkout customisation and the performance cost of large catalogues.
Commerce experience limited to installation, or catalogue scale problems never encountered.
Repeatable deployment
3 questions10Can you describe your workflow for developing and deploying changes?
Listen forSeparate local, staging and production environments, with deployment automated and repeatable across them.
Files uploaded over a file transfer connection, or no staging environment at all.
11Do you use version control on these projects?
Listen forVersion control covering themes, plugins and configuration, with database changes handled deliberately.
Version control not used, or database and file changes made directly on production.
12Have you migrated a site, and how did you handle the process?
Listen forMigrations rehearsed with serialised data handled correctly, and rollback available at cutover.
Database search and replace done without handling serialised data, or no rollback plan.
How to score responses
Score every candidate on the same four criteria immediately after the screen. At this stage you are shortlisting for panel interviews, not making the final call.
Technical proficiency
35%5Names specific hooks, writes custom blocks and plugins from scratch, and explains WP_Query versus direct SQL trade-offs precisely.
Systems and trade-offs
25%5Justifies build-versus-plugin calls with maintenance cost, and describes caching layers and database load under real traffic figures.
Evidence and rigour
25%5Cites concrete metrics (LCP dropped from 4.1s to 1.6s), profiling tools used, and how regressions were caught pre-deploy.
Collaboration and communication
15%5Describes editor-friendly builds they shipped, pushes back on unclear scope with alternatives, and leaves readable documentation behind.
Senior work is a site with forty plugins and a core version nobody dares update. A one-way video screen asks about the compromise.
Try it on HirevireScreening FAQ
Process basics
How long should a pre-screening round for this role take?
Fifteen minutes across eight to ten questions, answered async. Enough to establish sites they support, test their security and performance depth, and check deployment practice.
How does this differ from a general WordPress screen?
Senior work involves inherited codebases, compromises and migrations rather than building new sites from scratch. Weight incident handling, performance diagnosis and deployment discipline more heavily.
Evaluating answers
What is the strongest signal when screening this role?
A compromised site cleaned up properly. Senior developers describe finding the entry point rather than removing the visible damage. Anyone who reinstalled and moved on left the door open.
How do I judge their performance work?
Ask what made a site slow. Real answers name a specific query or plugin found by profiling. Anyone whose answer is caching has treated the symptom without finding the cause.
Go deeper on this role
Sanat has been hiring since 2012 and watching the recruitment industry change up close ever since, and turned that screening process into Hirevire's video screening platform. LinkedIn
