Martin Grellmann

Technical lead for the modernization of a Drupal multisite platform running seven holiday-rental websites. - Repaired and stabilized availability, enquiry and booking workflows after a five-year maintenance backlog. - Moved the platform to cloud infrastructure with separated dev and production environments. - Rebuilt property data, partner system and CMS integration as documented REST APIs. - Introduced Git, environment separation and secret handling where there was none. Drupal, PHP, MySQL, REST, Linux.

Senior SAP development focused on modernization, integration and software quality in S/4HANA projects. - Improved and extended backend API interfaces to support integration and system readiness. - Supported productive web services and APIs during hypercare in the FI environment. - Refactored an undocumented Business Suite Dynpro application into object-oriented ABAP for maintainability and S/4HANA readiness (IS-U). ABAP Objects, CDS Views, OData, SAP BTP, REST, Fiori/UI5, S/4HANA, Clean Core.

Business consulting and SAP solutions. Including SAP ABAP, SAP MII, SAP UI5 Freestyle, SAP Fiori Elements, SAP S4/Hana Public Cloud Side-By-Side Extension, S4/Hana Public Cloud Side-By-Side Extension, SAP RAP and SAP CAP. Implemented migrations from ERP to S/4 HANA and refactored existing applications.

Full-stack software development and Industry 4.0 applications. Refactoring PHP code and conducted application tests using PHPUnit. Developing React web frontends with Material Design. Also Installation, configuration of Linux and LAMP-stacks under Linux. Hardening and administration of CentOS.

Practical Internship to get deep into best practises. Practical training covered best practices in LAMP-Stack, Javascript, PHP, MySQL and Linux-Administration.

Fincaferien was one of the first German agencies to successfully broker vacation homes online. Active involvement in web and network enhancements. Experience with HTML/HTML5, CSS/CSS3, Git, Jira, PHP, Drupal, SEO, SEA and Linux administration. Experiences HTML/HTML5, CSS/CSS3 PHP, Drupal Git and Jira SEO, SEA Linux administration

Software architecture programme following the iSAQB CPSA-F Foundation Level curriculum: architecture design and documentation, quality requirements, patterns, technology decisions and trade-offs. Foundation Level training completed; certification exam planned for Q4 2026.

Training covered best practices in responsive web design, Javascript and PHP, MySQL, content management, e-commerce, and online marketing, including SEO, SEA and Google Analytics. Included a Scrum Master (PSMI) certificate.