Senior PHP Developer

8/2018 – 8/2018

Shopware upgrade and maintenance, TLS certificate setup, plugin and theme upgrades and customizations.
⇒Shopware, PHP 7.2, ExtJS, Smarty

PHP, Shopware

5/2018 – 5/2018

Upgrade a Shopware plugin code base in order to make it run on the upgraded Shopware 5.4.
⇒Shopware, PHP 7.2, ExtJS, Smarty

PHP, Shopware

11/2017 – 12/2019

Greenfield implementation of a marketplace for candidate referrals used by 500+ companies.
Optimized User Exprience by involving Server-Side Rendering, keeping the TTFB response rates <150ms, and
leveraging HTMX for user-interactive AJAX requests, keeping the added TTI (Time To Interactive) below 20ms.
DevOps: Established a CI/CD pipeline based on industry-standard best practices, allowing for up to 10 zero-downtime
deployments to production per hour, staging and QA environments.
Unit Testing and fully automated browser-based functional testing triggered via code commits by the team using GitLab
CI minimizes human error during development. Database Schema migrations using Flyway. Hybrid cloud/bare-metal
server infrastructure. (AWS, Google Cloud, Arch Linux natively on on-premise servers).
Image delivery and transformation via headless Inkscape and Cloudinary CDN API.
Scraping of 20 different ATS (Applicant Tracking System) providers in addition to API integrations for job listing
imports and candidate exports. Data Mining and extraction from crawled job postings and candidate profiles. Algorithm
design to find the best-performing overlap of auto-extracted vacancy requirements and candidate skills.
⇒PHP, Symfony, PostgreSQL, Clojure, OpenJDK, GraalVM, Intercooler.js.

PHP, Postgresql, Symfony

1/2016 – 12/2017

Led a growing team during a progressive modernization of a Wordpress-based site infrastructure to a microservice
architecture based on Symfony 3, facilitating a separate frontend in Vue.js. TDD coaching and process implementation.
Architecture design and implementation.
Optimized database schemata and query infrastructure to facilitate 3mln. visits / day. Integration of Cloudinary image
delivery CDN. API integration to E-Commerce partners connexity.com, guenstiger.de, billiger.de. Amazon
MWS/AWS API integration. Research and implementation of reliable crawling/scraping algorithms for Amazon.
⇒PHP, Symfony 3+4, MySQL, Intercooler.js, RESTful APIs.

Mysql, PHP, Symfony

10/2015 – 10/2016

Greenfield implementation of an E-Commerce flat share booking site. Development of an administrative back office for
customer and property management via Sonata Admin Bundle and AdminLTE. Migration of features from a legacy
MVP developed in Zend Framework 2, MySQL, and Drupal to a modular, Symfony-based microservice architecture.
Integrated the payment providers Paymill and Adyen. PHP, JavaScript, REST API. Developed and documented a
RESTful public-facing API for B2B partners.
⇒PHP+Symfony, MySQL, MariaDB, PostgreSQL. API interface to a ReactJS client.

Mariadb, Mysql, PHP, Postgresql, Symfony

1/2015 – 12/2015

Implementation of a recommendation algorithm based on customer’s shopping history. Memory usage reduction for
CSV and XML file exports by 64%, as well as other significant optimizations. Design and implementation of an
algorithm to automate voucher code generation and validation.
⇒LEMP stack, Zend Framework 1+2, Doctrine.

Zend Framework