Arpad Szabo
Verified Expert in Engineering
PHP 8 Developer
Funchal, Portugal
Toptal member since March 2, 2016
Arpad has been working as a full-stack web developer since 2004. He has good problem-solving skills and works equally well on his own as well as part of a team. He is keen to use the latest technologies to build any kind of web applications from single-page applications to enterprise solutions.
Portfolio
Experience
- PHP 8 - 20 years
- MySQL - 15 years
- PHP - 15 years
- CSS - 12 years
- REST APIs - 12 years
- Git - 8 years
- JavaScript - 8 years
- Amazon Web Services (AWS) - 8 years
Work Experience
Senior Software Engineer
Dongalen Enterprises Inc.
- Modernized a legacy PHP eCommerce platform by architecting a responsive, mobile-first product catalog system across 3,000+ files, eliminating duplicate logic and dramatically improving cross-device user experience and SEO indexability.
- Engineered a secure, tokenized checkout pipeline by integrating CyberSource Simple Order API alongside Authorize.net, enabling recurring subscription billing and reducing PCI compliance scope while maintaining continuous zero-downtime operations.
- Optimized automated data synchronization by refactoring the dailyrun.php cron pipeline, streamlining the extraction and import of thousands of product SKUs, shipping rates, and database state updates across distributed internal systems.
Senior Software Engineer
Winston Project, LLC
- Architected a customizable e-learning platform from scratch, constructing 40+ RESTful APIs and 30+ data models to serve courses, interactive multimedia content, and user-progression tracking metrics.
- Engineered robust payment integrations with Stripe, precisely orchestrating complex logic for subscriptions, one-off purchases, and dynamic coupon validations to eliminate duplicate billing errors.
- Built a tailored back-office CMS using Twill, providing operators with fine-grained access controls, comprehensive user subscription tracking, and large-scale, automated course batch ingestion tools.
- Streamlined administrative operations workflows by implementing automated lifecycle email sequencing via Mailgun and deploying automated interactive API documentation for future third-party integrations.
Freelance Senior Full-stack Developer
RaceOn (via Toptal)
- Integrated Stripe Connect.
- Fixed several bugs in the existing application.
Freelance Senior PHP Developer
Letsvyve (via Toptal)
- Migrated the old codebase to the latest version of Laravel.
- Created an admin dashboard with Laravel.
Freelance Senior PHP Developer
ILF Mobile Apps (via Toptal)
- Upgraded Herosearches.com to PHP 7 and refactored the codebase.
- Integrated Stripe API and Pipl API into Herosearches.com.
- Implemented new features for the back end of DDIutilities.com.
Senior PHP Developer
Freenet.de Gmbh
- Developed a REST API to serve the single-page web application and mobile apps.
- Wrote integration tests to ensure the proper operation of the REST API.
- Used Gearman to distribute non-real-time tasks between multiple servers to process them faster asynchronously.
- Utilized Solr to provide lightning-fast search results.
- Integrated PubNub service for real-time notifications.
Web Developer
PhishMe (via Toptal)
- Developed new features for the PhishMe Community.
- Integrated SSO for the PhishMe Community.
- Cleaned up old stylesheets for the PhishMe Community.
Web Developer
Wiera Kft
- Developed and maintained the company website.
- Created a reusable web shops module using Symfony.
- Built multiple web shops based on the above-mentioned module.
- Provided continuous support for the already-built web shops.
Project History
Single.de
- I've been working in the back-end team as a senior developer to develop and maintain the server side environment including the REST API to provide a unified interface for the front-end application and for the Android and iOS applications.
Used technologies: PHP, MySQL, Solr, Gearman, Jenkins
Education
Master's Degree in Computer Engineering
Technical University of Budapest - Budapest, Hungary
Certifications
AWS Solutions Architect Associate
Amazon Web Services (AWS)
Skills
Libraries/APIs
REST APIs, Stripe API, Vue, Backbone.js, Stripe, Facebook SDK, Facebook API, jQuery, Node.js, React, PayPal API, QuickBooks API, GitHub API, Salesforce API
Tools
GitHub, Git, Jenkins, GitLab, Bitbucket, Postman, Apache Solr, FreeMarker, PhpStorm, Sublime Text 3, Jira, Subversion (SVN), SendGrid
Languages
CSS, HTML, JavaScript, PHP, PHP 8, SQL, HTML5, CSS3, TypeScript, Java, SCSS, Sass, Less, GraphQL
Frameworks
Laravel, Lithium, Symfony, Symfony 2, Bootstrap, AngularJS, Slim, CakePHP, Yii 2, Ruby on Rails (RoR), Next.js
Paradigms
Scrum, Agile Software Development, Object-oriented Programming (OOP), Continuous Integration (CI), Kanban, Search Engine Optimization (SEO), Test-driven Development (TDD)
Platforms
Amazon Web Services (AWS), MacOS, HubSpot, Docker, Windows, CentOS, Linux, Grok, Eclipse, Heroku, Netlify
Storage
MySQL, PostgreSQL 10, Memcached, PostgreSQL, MongoDB, Redis, Amazon S3 (AWS S3), NoSQL
Other
APIs, Full-stack, Software, Back-end, Data Structures, Full-stack Development, Payment Gateways, Agentic AI, Agentic Coding, Artificial Intelligence (AI), Cursor AI, AI-assisted Development, Large Language Models (LLMs), Software Architecture, Technical Leadership, Product Roadmaps, PayPal, Intuit QuickBooks, eCommerce, Payments, Payment APIs, Front-end Development, CI/CD Pipelines, LLM Integration, Early-stage Startups, RESTFul APIs, CORS, GitHub Actions, QuickBooks Online
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