John Vasiliadis

My name is John Vasiliadis

Hi there!

Hi there!

My name is John Vasiliadis

Hi there!

Hi there!

20

Years

20

Years

20

Years

20

Years

RESUME

Senior Web Systems Engineer
 
Contact me for a full and up-to-date resume.
Email

Senior Web Systems Engineer

Platforms | CMS | Automation | High-Traffic Infrastructure

Senior Web Systems Engineer with 20+ years of experience in PHP development, CMS platforms, API integrations, and high-traffic web infrastructure. Proven ability to design scalable systems, optimize performance, and build automation workflows across marketing, publishing, and membership platforms.

Core Skills

  • PHP (5, 7, 8), MVC Architecture
  • REST API Development & API Integrations
  • Webhooks, System Integration, Automation
  • Content Management Systems (CMS)
  • MySQL, PostgreSQL, FileMaker Pro
  • Redis, Memcache, ElasticSearch
  • Linux, Apache, Nginx
  • Git, GitHub, SVN
  • Performance Optimization & Caching
  • Data Systems & Reporting

Technical Environment

Languages & Backend
  • PHP (5/7/8), JavaScript
Frameworks & CMS
  • Joomla, CakePHP, Concrete5
  • Vignette, Interwoven, Custom CMS Platforms
APIs & Automation
  • REST APIs, Webhooks, Zapier
  • Mailchimp, Jotform
Databases
  • MySQL, PostgreSQL, FileMaker Pro
Infrastructure & Tools
  • Linux, Apache, Nginx
  • Git, GitHub, Heroku
Search & Performance
  • Redis, Memcache, ElasticSearch

Professional Experience

Freelance

Senior Web Developer / IT Consultant | 03/2024 - Present

  • Lead PHP developer for Joomla-based CMS platform (PanagiaSoumela.org)
  • Designed and implemented REST API integrations and webhook-based workflows
  • Built automation systems connecting CMS, Microsoft 365, Mailchimp, Zapier, Jotform, and internal databases
  • Developed membership and donation systems with full data integration and reporting

VS Tech, CA

Senior PHP Developer | 03/2022 - 11/2023

  • Developed and optimized backend systems for a high-traffic platform serving 200M+ monthly users
  • Improved performance through SQL optimization, caching (Redis, Memcache), and API efficiency
  • Built internal automation tools and reporting systems using PHP and MySQL
  • Worked with REST APIs, cron jobs, and scalable backend services
  • Maintained codebases in PHP 7/8 and legacy PHP 5 environments using Git and SVN
  • Collaborated with frontend developers and marketing teams to implement analytics and tracking

Holy Institution Panagia Soumela, West Milford, NJ

IT Consultant | 2018 - 2021

  • Developed and managed CMS-based website and digital systems
  • Implemented email marketing automation using Mailchimp
  • Built form workflows and integrations using Jotform and backend scripting
  • Managed infrastructure, cron jobs, and data synchronization processes

Fullstack Academy, New York, NY

Web Development Bootcamp | 2019

Freelance

Web Developer / IT Consultant | 2018

  • Developed applications using PHP, CakePHP, Vue, and React

Major NY Union, New York, NY

Software Developer | 2016 - 2017

  • Developed internal accounting systems using custom development tools

Cambridge University Press, New York, NY

Senior Developer / Analyst | 2009 - 2015

  • Developed full-stack web applications using PHP, JavaScript, and MySQL
  • Automated workflows for editorial, marketing, and production teams
  • Managed data migration from legacy systems (SAP, Documentum)
  • Worked in Agile/Scrum environment using Jira

WholeHealthMD / IdeaSphere / Rebus, New York, NY

IT Director & Senior Developer | 1997 - 2007

  • Led development of high-traffic publishing platforms using PHP
  • Built CMS systems and e-commerce integrations
  • Developed internal tools for editorial and production workflows
  • Managed development team and coordinated web production processes

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