Senior WordPress/PHP Engineer

Custom Plugins · WooCommerce · Gutenberg · REST APIs · Performance · Production Support

I build and maintain WordPress systems that solve real business and operational problems. My work includes custom plugin architecture, WooCommerce workflows, structured data platforms, API integrations, performance engineering and production troubleshooting.

I have been building production websites since 2017 and have worked across independent client delivery, remote WordPress product support and frontend engineering.

Portfolio · LinkedIn · Upwork · WordPress Plugin

• Custom WordPress plugin development
• WooCommerce extensions and operational workflows
• Gutenberg blocks and editor-friendly content systems
• REST APIs, webhooks and third-party integrations
• Structured imports and high-volume content processing
• WordPress performance and Core Web Vitals
• Production debugging and technical support
• Security, privacy and maintainable data handling
• WP-CLI, automated checks and GitHub Actions

Designed and extended a structured WordPress platform supporting more than 3,000 event records across English, Spanish, French and Italian.

Key responsibilities included:

• Custom post types and structured metadata
• Automated CSV and spreadsheet import workflows
• Multilingual content and URL handling
• Custom AJAX-powered event presentation
• Data validation and operational troubleshooting
• Performance and maintainability improvements

Built a custom import system for a data-heavy WordPress project.

The workflow included:

• Input validation and error reporting
• Structured field mapping
• Progress handling
• Duplicate and data-integrity checks
• Admin workflow improvements
• Repeatable processing for large datasets

The system reduced a manual process that previously required more than 100 hours to approximately two hours.

Worked in a remote WordPress product-support environment serving products with more than 50,000 daily active users.

Responsibilities included:

• Reproducing and isolating production issues
• Investigating plugin and theme conflicts
• Query and server profiling with Query Monitor and New Relic
• Customer-facing technical communication
• Developer documentation and escalation notes
• Performance improvements, including load-time reductions from approximately eight seconds to 1.2 seconds in selected environments

A WordPress image-optimization plugin that converts images to WebP directly on the website server.

• No external image-processing API
• Automatic conversion during uploads
• Bulk conversion for existing media
• Adjustable quality settings
• EXIF rotation handling
• Smaller-file fallback logic
• Privacy-focused local processing

Repository:
github.com/iamsaddamhossen/saddam-hossen-webp-optimizer

My personal WordPress engineering site is built with a custom theme and companion plugin.

It demonstrates:

• Custom content models and registered metadata
• Native WordPress editing workflows
• Versioned REST API routes
• A dynamic Gutenberg block
• WP-CLI commands
• Privacy exporter and eraser integration
• Site Health diagnostics
• Cache invalidation and scheduled maintenance
• Automated quality checks with GitHub Actions

Repository:
github.com/iamsaddamhossen/saddamhossen-portfolio

A WordPress audit product currently in development, focused on helping site owners investigate performance, security, compliance and search-readiness issues.

The project is being developed around:

• Modular audit checks
• Evidence-based findings
• Safe remediation workflows
• Backup and rollback planning
• REST-based integrations
• Clear separation between deterministic checks and optional AI assistance

PHP · OOP · WordPress Plugin API · Hooks and Filters · Custom Post Types · Registered Metadata · MySQL · REST API · WP-CLI · Composer · PHPUnit · PHPCS

Checkout customization · Payment workflows · Order lifecycle · Webhooks · Product logic · Performance troubleshooting · HPOS awareness

Gutenberg · block.json · React · JavaScript · HTML · CSS · Responsive interfaces · Accessibility · Progressive enhancement

Core Web Vitals · Query Monitor · New Relic · Redis · Cloudflare · LiteSpeed · Caching · Database analysis · Image optimization · Site Health

REST APIs · Webhooks · Payment integrations · CRM integrations · Postman · OpenAI and Claude API workflows

Git · GitHub · GitHub Actions · LocalWP · Docker fundamentals · VS Code · Code review · Technical documentation

1. Clarify the system
   Understand requirements, data ownership, constraints and failure paths.

2. Investigate before changing code
   Reproduce the issue, inspect logs and isolate the responsible layer.

3. Use native WordPress APIs
   Prefer documented hooks, metadata, REST, privacy and editor APIs over fragile workarounds.

4. Implement the smallest safe change
   Keep responsibilities clear and avoid unnecessary coupling.

5. Verify production behavior
   Test success paths, failures, permissions, caching, accessibility and rollback options.

6. Document the decision
   Record assumptions, trade-offs, deployment notes and maintenance requirements.

• saddam-hossen-webp-optimizer
  Local WebP image optimization for WordPress.

• custom-woocommerce-bkash-payment-gateway-plugin
  WooCommerce payment-gateway implementation and order workflow experiment.

• saddamhossen-portfolio
  Custom WordPress engineering site with a theme, companion plugin and automated quality checks.

• saddam-core
  Reusable WordPress components and development foundations.

• sh-starter
  A starter architecture for custom WordPress client projects.

• Independent WordPress/PHP Engineer
  Custom development, WooCommerce, integrations, performance and international client delivery.

• WordPress Technical Support Engineer
  Production debugging, product support, performance investigation and technical documentation.

• Frontend Developer
  Responsive interfaces, JavaScript, React, REST integrations and browser-level debugging.

I am also Top Rated on Upwork with 100% Job Success.

• Full-time remote WordPress/PHP engineering roles
• WordPress plugin-development roles
• WooCommerce engineering roles
• WordPress product and technical-support roles
• Long-term engineering partnerships
• Selected custom plugin and integration projects

• Portfolio: saddamhossen.dev
• LinkedIn: linkedin.com/in/saddam-hossen-dev
• Upwork: View Upwork profile
• WordPress plugin: Saddam Hossen WebP Optimizer
• Email: saddam.wp007@gmail.com