
Andrew Miller
Verified Expert in Engineering
WordPress Developer
Cedar Rapids, IA, United States
Toptal member since September 24, 2018
Andrew has 30 years of web development experience, including 13 years specializing in WordPress. He provides custom plugin development, security audits, API integrations, and maintenance services to digital agencies (on a white-label basis) and clients across various industries, including finance, healthcare, education, eCommerce, and more. Andrew combines AI-enhanced development tools (with client opt-out available) with in-depth WordPress expertise for efficient solutions.
Portfolio
Experience
- PHP - 20 years
- WordPress - 14 years
- WordPress Plugins - 13 years
- WooCommerce - 12 years
- WordPress API - 10 years
- WooCommerce Subscriptions 2 - 10 years
- WooCommerce API - 10 years
- WordPress REST API - 8 years
Preferred Environment
Linux, Git, WP Engine, REST APIs, WordPress, Kinsta, GitHub, GitHub Actions, PHP 8, MySQL
The most amazing...
...integration I built automated market data for an investment firm with dozens of funds and thousands of data points, using an external API and bulk import tools.
Work Experience
Founder | Principal Engineer & Consultant
84EM
- Built a scalable multi-tenant WordPress platform serving enterprise clients with unified administration, eliminating maintenance overhead from managing separate installations while delivering customized leadership development content.
- Automated financial data synchronization for investment firms, integrating FastTrack API to maintain real-time market information across hundreds of tickers and thousands of documents without manual intervention.
- Developed an AI-driven WordPress plugin that generates hundreds of unique, SEO-optimized local market pages automatically, transforming manual content creation into a scalable national expansion strategy.
- Architected a multi-layered identity verification system for financial institutions, seamlessly integrating HubSpot, IDology, and Persona APIs to authenticate customers before credit applications and transactions.
- Created a comprehensive WooCommerce subscription analytics system tracking customer behavior patterns and engagement metrics beyond standard platform capabilities, enabling data-driven retention strategies.
- Automated WooCommerce order status synchronization with Aftership tracking integration, eliminating manual post-delivery workflow updates across multi-channel fulfillment and shipping providers.
- Built an AI-powered Gravity Forms analysis plugin, transforming raw lead data into actionable sales intelligence, providing contextual prospect insights beyond standard contact information collection.
- Developed a WordPress file integrity checker plugin, automating security monitoring across multiple installations, detecting unauthorized file modifications without requiring manual oversight or intervention.
- Synchronized healthcare provider data with real-time appointment availability through Looker API integration, enabling on-demand medical house call scheduling for geographically distributed service areas.
- Built a security plugin to monitor file changes. Operates without requiring manual intervention. Site administrators receive immediate alerts via Slack and email when files are changed, enabling a rapid response to potential security incidents.
WordPress Developer
Panacea Financial, a division of Primis Bank
- Built a custom integration between Hubspot, IDoloy, and Persona to verify the identity of visitors when submitting lead forms for pre-approval of credit.
- Worked with marketing and design teams on the rebuild of web pages as part of a design overhaul.
- Consulted with C-suite and internal security teams in response to a DDOS ransom attack and assisted with the mitigation.
- Implemented the use of a child theme with Git version control. Moved custom code out of code snippets plugins into the theme. Added a development workflow with Git deployments and automated QA processes.
- Made performance improvements, including dequeuing unused scripts and styles, removing unused plugins, optimizing CSS and JSS, ensuring lazy loading of images, videos, and iframes, and ensuring all images are correctly optimized and served in next-gen formats.
- Handled regular monitoring of site uptime, performance, and security.
Senior Back-end WordPress Developer
Timeforcake Creative Media Inc dba Followbright
- Built and enhanced and MVP for a continuation education site for healthcare professionals.
- Built multiple custom API integrations for custom reporting.
- Built a custom single sign-on (SSO) that supports unlimited IDPs so tens of thousands of employees across dozens of integrations can use their own internal authentication processes.
Web Developer
Mudd Advertising
- Developed custom WordPress plugins and themes for over 100 clients.
- Provided monthly maintenance of 100+ client websites.
- Built a marketing and lead generation theme/plugin combination for WordPress, which took 15 hours to create and generated $25,000 a month in revenue for the client.
- Constructed complex websites and integrations for popular WordPress plugins, such as WooCommerce, Gravity Forms, and Advanced Custom Fields for clients of various industries.
- Developed a custom WooCommerce site with multi-vendor support that allowed different vendors to display different products on the front end, acting as if each vendor had its own store.
Web Developer
Successories
- Created custom NetSuite integrations to allow two different NetSuite accounts to talk to one another via their REST API.
- Integrated NetSuite with a custom-built (in-house), external LAMP-based website platform.
- Provided code support for the client's custom-built LAMP CMS.
Web Developer
Clickstop, Inc.
- Built websites on the NetSuite platform for a multi-channel online eCommerce retailer whose revenue exceeded $50 million/year.
- Performed administration, customization, and automation of the company's NetSuite account, streamlining processes to improve efficiency.
- Learned the SuiteScript programming platform that NetSuite provides for more extensive automation and integration with their platform.
- Wrote processes such as the auto-approval of orders which greatly reduced tedious, manual tasks for salespeople.
- Integrated the account with an external image management tool which speed and simplified the process of maintaining product images within NetSuite.
Director of Application Development
Metro Studios
- Built dozens of custom, from-scratch websites for clients in various industries.
- Developed custom eCommerce applications and integrations with third-party payment processors and CRMs.
- Provided server administration and hosting support for hundreds of websites on dedicated web servers hosted at Rackspace.
- Provided ongoing support to clients in the manner of website updates, fixes, etc.
Web Developer | Search Engine Specialist
Over Coffee Productions
- Built websites using a custom-built, proprietary CRM built-in PHP in a LAMP environment.
- Leveraged SEO best practices to boost conversion rates for several eCommerce and lead generating clients, including national brands.
- Provided phone and email support for clients as part of their monthly maintenance packages to add new content and functionality.
Freelance Web Developer
Freelance
- Built custom websites in the late '90s and early '00s for various clients such as retail businesses, musicians, authors, and more.
- Tripled the conversion rate for an author's WYSIWYG website by decreasing load times through a rebuild to a static website.
- Implemented dynamic website functionality, such as payment forms, message boards, guestbooks, and more, using Common Gateway Interface (CGI) and Perl.
Experience
Enterprise Investment Fund Data Management Platform
• Automated complete data pipeline between FastTrack market data API and WordPress using token-based authentication and scheduled synchronization.
• Implemented custom post types with Advanced Custom Fields for financial metadata, connecting funds to hundreds of tickers.
• Created background processing via Action Scheduler, handling market data, performance statistics, and dividend distributions without impacting site performance.
• Developed multi-format bulk importers using PhpSpreadsheet for Excel and CSV files from custodians.
• Built SFTP integration for automated file retrieval with parsing and validation.
• Created a ZIP processor for bulk document management, extracting PDFs and metadata.
• Designed custom Elementor widgets displaying fund overviews, performance charts, and interactive document viewers.
• Implemented a comprehensive WP-CLI suite for data operations and API testing.
• Added REST API monitoring for real-time data freshness visibility.
• Created custom database tables logging API requests and audit trails supporting regulatory compliance.
AI-powered Geographic SEO Content Generation System
• Built modular architecture with dependency injection and encrypted AES-256-CBC API key storage.
• Implemented intelligent fuzzy keyword matching, automatically linking service terms to appropriate pages.
• Created a dual-tier content system with state pages integrating six cities and hierarchical city child pages.
• Built ContentProcessor with tag-aware HTML parsing, preventing malformed nested links.
• Developed automated interlinking connecting city names and service keywords using context-aware URL generation.
• Implemented LD-JSON schema for LocalBusiness structured data with geographic containment.
• Created WP-CLI interface supporting bulk operations and progress tracking.
• Added schema regeneration for metadata updates without content modification.
• Integrated GitHub Actions workflows with health check endpoints.
• Built retry logic with exponential backoff for API resilience and comprehensive error handling.
Real-time Cryptocurrency Market Data Integration
• Built REST API middleware connecting internal pricing systems to a public WordPress site.
• Implemented a webhook-triggered update system, ensuring market data synchronization without polling overhead.
• Designed an intelligent caching layer balancing data freshness with API rate limits.
• Created a shortcode system for embedding real-time cryptocurrency prices and performance metrics.
• Built interactive chart components visualizing historical trends and trust performance using JavaScript libraries integrated with WordPress REST API.
• Developed admin interface for managing trust configurations and cache rules.
• Implemented error handling and fallback mechanisms for external API downtime.
• Created a logging system tracking API calls and webhook deliveries for monitoring.
• Built an automated testing suite validating data accuracy and synchronization timing.
Advanced WooCommerce Subscription Analytics Platform
• Designed a custom database schema capturing conversions, renewal patterns, cancellations, and lifetime value metrics.
• Implemented asynchronous processing using Action Scheduler, ensuring zero checkout performance impact.
• Created event-driven architecture capturing subscription lifecycle events.
• Developed an administrative dashboard with filterable reports, cohort analysis, and revenue forecasting.
• Built data visualization displaying retention curves and customer lifetime value distributions.
• Created CSV export for external business intelligence analysis.
• Implemented GDPR-compliant data collection with automatic anonymization.
• Designed an extensible hook system for third-party integrations.
• Added automated email notifications for significant metric changes.
Gravity Forms AI Lead Intelligence Plugin
• Built an encrypted API key storage system using WordPress options API with secure credential management.
• Implemented automatic field detection, analyzing all text inputs without manual configuration.
• Created entry detail page integration displaying AI-generated insights directly within the Gravity Forms admin interface.
• Designed smart rate limiting to prevent API quota exhaustion during high-volume submission periods.
• Built a markdown storage system preserving analysis formatting while maintaining data organization.
• Created one-click HTML report generation for easy viewing and sharing.
• Implemented delete functionality with confirmation prompts for analysis data management.
• Developed per-form customization through the Advanced Settings interface, allowing tailored prompts for specific business needs.
• Added developer-friendly hook system enabling custom prompt adjustments.
• Built a comprehensive testing suite ensuring reliable operation across WordPress environments.
• Published as an open-source project on GitHub with complete documentation.
Certifications
Certified WordPress Expert
Codeable
Skills
Libraries/APIs
WordPress REST API, jQuery, WordPress API, Google Maps, WooCommerce API, REST APIs, JSON API, Stripe API, Google Maps API, Stripe, Claude API, GitHub API, Node.js, React, Google Ads API, Google Analytics API, Python API
Tools
Git, MySQL Workbench, PhpStorm, LearnDash, GitHub, ACF PRO, Advanced Custom Fields (ACF), AffiliateWP, Google Analytics, WP-CLI, Zapier, WPBakery, Gravity Perks, GravityView, Claude, GitHub CLI, GitHub Pages, Gulp, Postman, NGINX, Multiple Listing Services (MLS), Gutenberg Editor, Figma
Languages
PHP, XML, HTML, CSS, JavaScript, CSS3, HTML5, PHP 5, PHP 7, Perl, SQL, PHP 8, Python, Python 3
Frameworks
CodeIgniter, CodeIgniter 3, JSON Web Tokens (JWT), Laravel, Tailwind CSS, Bootstrap 3+, Swagger
Paradigms
REST, Non-CMS Web Development, Database-driven Web App Development, Search Engine Optimization (SEO), Automation, Object-oriented Programming (OOP), Hosting, Responsive Web Design (RWD), DevOps
Platforms
LAMP, Apache2, WordPress, Linux, WooCommerce, WordPress VIP, Google Cloud Platform (GCP), Amazon Web Services (AWS), Mailgun, HubSpot, Drupal
Storage
JSON, MySQLi, MySQL, WP Engine, Database Migration, MariaDB, Databases, SQL Performance, Relational Databases, Data Pipelines, Database Security
Industry Expertise
Project Management, Cybersecurity
Other
APIs, WordPress Themes, WordPress Plugins, WordPress Rescue, WooCommerce Subscriptions 2, Data Migration, eCommerce, Subscriptions, REST API Clients, JSON REST APIs, Plugins, Elementor, Web Development, Web App Development, Full-stack, Website Maintenance, Website Audits, Website Management, Website Migration, Server Migration, Gravity Forms, Web Security, Security, Yoast SEO, Technical Leadership, Content Management Systems (CMS), Payment APIs, Online Payments, Web Project Management, WordPress eCommerce, WordPress Multisite, Webhooks, Performance Optimization, Performance, QR Codes, Third-party APIs, Website Optimization, Application Security, SSH, API Integration, Front-end Development, Page Speed Optimization, Plugin Development, Theme Customization, Web Scalability, Ajax, Full-stack Development, WordPress Security, Cloudflare, Kinsta, GoDaddy, Meta Ads, WordPress Cron, CI/CD Pipelines, GitHub Actions, GitHub Workflows, GitHub Copilot Chat, Content Migration, AI to WordPress, Custom WordPress, HTML to WordPress, Artificial Intelligence (AI), Event Tracking, SEO Tools, WordPress Maintenance, Localization, Architecture, Fintech, Elementor Pro, FastAPI, Startups, AI Agents, Large Language Models (LLMs), Infrastructure, Learning Management Systems (LMS), Server Security, General Data Protection Regulation (GDPR), Appointment Booking, Booking Systems, Technical Architecture, IT Security, Servers, PCI Compliance, WordPress Design, IDX Integration, User Interface (UI), Multilingual Websites, Fractional CTO, WCAG 2, ADA Compliance, Data, Headless CMS, Google Analytics 4 (GA4)
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