Особисті дані приховані

Michael Demchenko
Senior PHP Backend Engineer | Software Architecture | Technical Leadership

Phone: [відкрити контакти](див. вище в блоці «контактна інформація»)
E-mail: [відкрити контакти](див. вище в блоці «контактна інформація»)

SUMMARY

Senior Software Engineer with 15+ years of experience developing, modernizing, and maintaining web
applications, with a strong focus on backend engineering and enterprise systems.
Extensive experience in object-oriented PHP, custom business logic, application architecture, third-party
integrations, data migrations, and legacy code modernization. Strong understanding of software design
principles, maintainability, performance optimization, and automated testing.
Deep production expertise in enterprise Drupal applications, with extensive practical experience utilizing
Symfony components, dependency injection, event-driven architecture, HTTP request handling, and
modern PHP development practices. Additional experience with standalone PHP applications and
familiarity with Laravel.
Experienced in technical leadership, architectural planning, code reviews, engineering standards,
mentoring, and collaboration with cross-functional teams and enterprise stakeholders.

TECHNICAL SKILLS

Core Expertise
Backend Engineering • Software Architecture • API & System Integrations • Data Migrations
Legacy Modernization • Performance Optimization • Automated Testing • Technical Leadership

Languages & Technologies
PHP • SQL • Python • JavaScript • Lua • JSON • XML
MySQL • MariaDB • Solr • Sphinx • Elasticsearch

Architecture & Principles
PHP • SQL • Python • JavaScript • Lua • JSON • XML
Dependency Injection • Refactoring • Code Quality • Access Control

Frameworks & Components
Symfony • Laravel • Drupal 6-11 • WordPress • Standalone PHP Applications

API & Backend Development
REST • SOAP • GraphQL • Third-Party Integrations • Data Synchronization
Database Design • Query Optimization • Caching Strategies

Testing & Quality Engineering
PHPUnit • Behat • Selenium • TDD • BDD • Code Coverage
Unit Testing • Integration Testing • Functional Testing • E2E Testing

DevOps & Tools
CI/CD • Git (GitHub/GitLab/Bitbucket) • GitHub Actions
Docker • DDEV • WSL2 • Composer • Xdebug • Drush • NPM • Gulp
AI-Assisted Development • Coding Agents • OpenAI Codex • GitHub Copilot

Frontend & Performance
HTML • CSS • SCSS • LESS • Twig • jQuery • Bootstrap • Foundation • Atomic Design
Core Web Vitals • Lighthouse • BrowserStack • Partytown • Percy • Akamai CDN (Certified)

PROFESSIONAL EXPERIENCE

Deloitte Technology Services August 2025 - April 2026
Senior Consultant
- Designed a multi-layer automated testing strategy for an enterprise PHP application, establishing unit,
integration, functional, end-to-end, and visual testing approaches across infrastructure, application, and
client layers.
- Designed and documented reproducible local testing environments using DDEV, PHPUnit, and
PHPStorm, covering test database provisioning, debugging, and code coverage analysis.
- Integrated code coverage measurement into GitHub Actions CI workflows, providing automated visibility
into test coverage.
- Authored engineering guidelines and training materials for automated testing and refactoring legacy
procedural PHP code into independently testable components.
- Developed operational policies for secure environment configuration and secrets management across
enterprise systems involving Akeyless, MuleSoft, and Saviynt.
- Owned the Alibaba Aliplayer SDK integration, coordinating licensing and version upgrades with vendor
engineers and resolving critical playback compatibility issues affecting Safari and Edge.
- Designed cross-environment validation scenarios and provided technical support for applications
associated with the Milano-Cortina 2026 Winter Olympic and Paralympic Games.

Wunderman Thompson | Nokia August 2022 - December 2023
Senior Drupal Developer / PHP Backend Engineering
- Designed and implemented custom backend functionality for a large-scale, multi-site enterprise PHP
application, extending platform capabilities to meet business requirements.
- Modernized legacy application components through object-oriented PHP refactoring, dependency
upgrades, and compatibility fixes, improving code maintainability and alignment with contemporary
development practices.
- Identified, investigated, and resolved complex defects involving legacy code, application behavior, and
third-party dependencies.
- Implemented third-party dependency offloading strategies, reducing browser main-thread workload and
improving First Contentful Paint and overall application performance scores.
- Introduced automated testing into the development lifecycle to support application quality and regression
testing.
- Contributed to architectural planning, technical decision-making, and code reviews across the enterprise
application.

InterEx Group | everis / NTT DATA March 2021 - September 2021
Senior Drupal Developer / Backend Tech Lead
- Architected and implemented a custom authorization system supporting group-based access policies,
integrating with the application's entity access and content management workflows.
- Developed custom backend workflow handlers coordinating content moderation, scheduled operations,
and application-specific business processes.
- Extended complex application components through custom implementations and overrides to support
requirements beyond standard platform capabilities.
- Modernized legacy PHP code through object-oriented refactoring and alignment with contemporary
engineering standards.
- Led backend development activities, contributing to architectural design, technical planning, and
implementation decisions.
- Investigated and implemented custom patches and compatibility fixes for third-party components.

Independent Contractor | Upwork November 2018 - March 2021
Senior PHP / Drupal Developer
- Designed and implemented custom backend functionality, application extensions, and integrations for
PHP-based client applications.
- Architected and executed complex data migrations across application versions and external platforms,
developing custom migration and transformation logic to accommodate heterogeneous data structures.
- Modernized legacy PHP applications by replacing deprecated APIs, refactoring procedural and outdated
code into maintainable object-oriented components, and resolving compatibility issues during platform
upgrades.
- Managed end-to-end software delivery, including requirements analysis, architecture, implementation,
deployment, and post-launch maintenance.
- Led development teams, conducted code reviews, and introduced automated testing and coding
standards to improve software quality.
- Established environment-specific configuration management and deployment workflows using Drupal
Config Split and related development tooling.

Tremend June 2017 - November 2018
Middle Drupal Developer
- Designed and implemented backend integration with NetSuite CRM, including custom user
synchronization logic and coordination of application user lifecycle events with external CRM records.
- Developed configurable multilingual email notification functionality supporting authentication and user
management workflows.
- Implemented data sanitization functionality for removing confidential content from application data.
- Developed custom routing and redirect logic to accommodate application-specific business requirements.
- Investigated and refactored legacy PHP code while maintaining and extending existing Drupal and
WordPress applications.

Independent Contractor | oDesk September 2014 - June 2017
Middle PHP / Drupal Developer
- Developed and maintained PHP-based web applications, implementing custom backend functionality and
application extensions.
- Modernized legacy application components through deprecated API migrations, dependency upgrades,
refactoring, and custom compatibility patches.
- Executed data migrations between Drupal and external systems, supporting applications across multiple
PHP-based platforms.
- Diagnosed and resolved application defects involving legacy code, compatibility, and third-party
dependencies.
- Supported projects built with Drupal, WordPress, Joomla, TYPO3, and standalone PHP.

Local Companies & Freelance January 2009 - September 2014
Junior / Middle Drupal Developer
- Developed and maintained PHP web applications, implementing custom features according to technical
specifications and business requirements.
- Assisted with data migrations and content imports, and collaborated with developers, designers, and QA
engineers throughout application delivery.
- Used version control, debugging, and development tooling to support application maintenance and
feature implementation.