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You don’t need to be a developer to judge developer quality. If your WordPress site is revenue-critical, you should demand visible evidence of best practices, not vague assurances. Use the checkpoints below to audit how your developer writes code, structures themes, manages delivery, and measures outcomes—because “works on my machine” is not a strategy.

Audit Their WordPress Code: Clean, Commented, Safe

Ask to see a representative pull request or plugin/theme folder. Clean code looks intentional: meaningful names, small functions, consistent formatting, and zero dead code. Look for docblocks on classes and functions, inline comments that explain “why,” not just “what,” and translation-ready strings via (), _e(), esc_html(), etc., with a consistent text domain. Bonus points if they enforce WordPress Coding Standards (WPCS) with PHPCS in their editor and CI; you should see a phpcs.xml and minimal rule suppressions.

Safety is non-negotiable. Inputs should be sanitized on save (sanitize_text_field, sanitize_email, wp_kses) and escaped on output (esc_html, esc_attr, esc_url). Nonces must protect state-changing actions; database queries go through $wpdb->prepare or higher-level APIs; no eval, no unsafe unserialize, no direct file edits/uploads without validation. Admin AJAX endpoints should validate capability checks and nonces, and modern builds should prefer the REST API over ad-hoc admin-ajax funnels.

Finally, check WordPress-specific patterns. Scripts and styles must be enqueued (no raw or CDN links hardcoded into templates), dependencies declared, and versions set for cache-busting. Avoid mixing concerns: template files render, not orchestrate business logic; custom functionality belongs in plugins, not theme functions.php. Red flags: editing wp-core, suppressing errors with @, dumping data with var_dump in production, or shipping minified-only sources with no originals.

Demand Solid Themes, Child Themes, and Standards

A trustworthy developer can explain why they chose a parent theme, a block theme, or a bespoke build. If using a third-party parent, it should be reputable, updated, and licensed properly; customizations belong in a child theme to survive updates. For modern WordPress, expect theme.json, block patterns, template parts, and restrained use of page builders. If a builder is required, they should prove it won’t shatter performance, accessibility, or maintainability.

Separation of concerns matters. Theme = presentation; Plugin = functionality. Custom post types, taxonomies, shortcodes, and business logic live in a site-specific plugin (versioned, documented), not the theme. Content should not be hardcoded into templates; instead, use blocks, template parts, widgets, or ACF/Block variations when appropriate. Enqueue assets properly, no editing vendor code in place, and maintain a clear assets pipeline (Vite/Webpack) with source maps.

Demand adherence to WordPress’s template hierarchy and coding standards. The style.css header should be accurate; templates named logically; partials organized; no duplicate queries for the same data without caching; no direct calls to external APIs in templates. Red flags: editing parent theme files, sprinkling critical CSS/JS into the Customizer, random snippets pasted into functions.php to “fix” issues, or abandoning the block editor because “it’s hard.”

Insist on Git, Code Reviews, Tests, and CI/CD

No Git, no deal. Your developer should use a branching strategy (feature branches, protected main), semantic commits, and pull requests with linked issues. Code reviews should follow a checklist: security, performance, accessibility, internationalization, and maintainability. You should see a CONTRIBUTING.md, coding guidelines, and a clear README with setup steps (Composer, npm, wp-env/Docker).

Testing is part of the work, not an optional nice-to-have. Expect PHPUnit for unit/integration tests, and Playwright/Cypress for end-to-end flows (log in, checkout, form submit). Add static analysis (PHPStan/Psalm), PHPCS with WPCS, ESLint/TypeScript, Stylelint, and Prettier. Pre-commit hooks (Husky) should block bad code from entering the repo; snapshots or visual tests can catch CSS regressions. Show me the coverage report or at least the commands to run tests locally.

CI/CD should be boring and repeatable. GitHub Actions/GitLab CI run installs, linters, tests, and build steps on every PR; merges deploy automatically to staging, then production via approvals. Secrets live in the CI vault, not the repo. Releases are tagged, changelogs written, and rollbacks are one click. Migrations use WP-CLI and safe search-replace; environments are configured via .env and environment-specific wp-config settings. Zero-downtime deploys, backups before releases, and post-deploy smoke tests are the baseline.

Track Speed, Security, Accessibility, and SEO

What gets measured gets improved. Set performance budgets and track Core Web Vitals (LCP, INP, CLS) with Lighthouse, PageSpeed Insights, and Real User Monitoring. Use caching wisely: full-page caching, object caching (Redis), opcache, and a CDN; ship modern image formats (WebP/AVIF), lazy-load media, preload critical resources, and minimize JavaScript. Query Monitor should show lean queries; no N+1 loops; cron tasks are scheduled, not blocking requests.

Security is a posture, not a plugin. Keep core, themes, and plugins updated; pin versions; scan for vulnerabilities (WPScan, Snyk), and prune abandoned dependencies. Enforce least privilege (no admins for casual editors), 2FA, secure salts, and DISALLOW_FILE_EDIT in production. Validate uploads, rate-limit logins, and consider a WAF. Backups are automated, tested, offsite, and include both files and database. Monitor logs and errors (Sentry/New Relic) and have an incident playbook.

Accessibility and SEO are daily habits. Test with axe, keyboard-only navigation, and screen readers (NVDA/VoiceOver); ensure semantic HTML, proper headings, labels, focus styles, skip links, and color contrast (WCAG 2.2 AA). For SEO, maintain clean information architecture, XML sitemaps, robots.txt, canonical tags, schema.org JSON-LD, Open Graph/Twitter cards, and a sane permalink and redirect strategy. Track crawl errors, 404 rates, and index coverage in Search Console, and tie improvements to measurable KPIs.

Best practices are visible. Ask for the repo, the pipeline, the test results, the audit reports—and the developer who follows them will be proud to show you. Anything less is technical debt with interest. Hold the line, demand proof, and your WordPress site will reward you with speed, safety, and sustainable growth.