Freelancer profile translated to English.

Description

I am an experienced Senior Software Engineer with extensive expertise in full-stack development, system modernization, and technical architecture of modern web applications. For two decades, he has been developing and optimizing complex platforms based on Java/Spring, Angular, REST APIs, and containerized infrastructures. I have many years of experience in integrating existing systems, building automated build and deployment processes, and improving the quality and performance of productive systems. With his analytical approach, technical depth, and ability to lead engineering teams, he ensures robust, scalable, and future-proof software solutions.

Industry field of expertise

Languages

German
Native or bilingual
English
Conversational
Arabic
Basic

Workplace preferences

Can work on-site

Hamburg (up to 50km)

Marketoolz.com
Lead- & Full-Stack Developer
ENVIRONMENTAL
July 2020 - December 2025 (5 years and 5 months)
Conception, development, and continuous further development of a modular, customizable B2B solution for the disposal and bulk goods industry. The goal was to technologically modernize the platform, make industry-specific requirements flexibly representable, and enable easy integration with existing disposal company systems through targeted integration measures. This included, among others:
Migration from Spring to Spring Boot including continuous updates
Introduction and expansion of REST interfaces
New construction of the frontend (AngularJS → Angular)
The platform was successfully introduced in production with numerous customers during the project and individually expanded.
Development of a modular software architecture (Java Libraries, REST APIs, Angular Frontend) → improved extensibility, simplified maintenance
Introduction of SonarQube & Test-Driven Development → measurably higher code quality and fewer development errors
Development of a CI/CD pipeline with Bamboo including semantic versioning & automated release management → stable, reproducible deployments and shortened release cycles for ~30 individual customer portals
Introduction of transparent release & version management including documentation and coordination with all stakeholders (internal & customers) → clear visibility at all times of which version is deployed where, planned maintenance windows, update cycles, and rollout statuses
Setup and initial provisioning of new server landscapes including automation of provisioning via Bamboo → foundation laid for fully automated, pipeline-triggered deployments
Migration AngularJS → Angular including successive upgrades → improved UX, performance, and long-term maintainability
Integration of external systems, including Shopware synchronization
Setup and operation of Kubernetes clusters including Helm Charts, monitoring with Prometheus & Grafana → scalable, highly available infrastructure
Spring boot Angular Grafana Hibernate Java
Satzmedia
Full-Stack Developer
FASHION AND COSMETICS
July 2017 - July 2020 (3 years)
Hamburg, Germany
Conception and implementation of new backend modules (Java, Spring, Hippo CMS)
Further development and modernization of the frontend
Development of new integrations (REST, JSON, SOAP)
Ensuring the quality and stability of live systems The projects included the further development of corporate websites, shop modules, and internal portal solutions. A central goal was the representation of large amounts of data (product catalogs, vehicle parts, cosmetic products) and their efficient provision to users in different countries.
An essential component was working on high-priority task packages ("Fastline"), where rapid planning, technical implementation, testing, and on-time deployment were crucial. In parallel, internal company systems were further developed, technical concepts were created, and the development process was actively shaped (estimation rounds, sprint planning, reviews).
technical implementation, testing, and on-time deployment were crucial.
Planning, conception, and implementation of backend and frontend modules for web portals and shop systems
Implementation of new functions to expand international corporate websites
Further development of the e-commerce shop based on Hippo CMS and KonaKart → improved maintainability and faster time-to-market
Creation of technical concepts & specifications for new modules, APIs, and frontend components
Quality assurance through code reviews, pair programming, and automated tests → measurably higher code quality
Responsibility for "Fastline" (high-priority task packages) → planning, coordination, technical implementation & on-time delivery
Independent execution of deployments for all relevant systems on defined release dates
Introduction of code standards & formatting rules for backend and frontend → clear conventions and uniform code style within the team
Java JavaScript Bloomreach Load Balancing KonaKart
Digitec
Full-Stack Developer
BANKING AND INSURANCE
July 2015 - June 2017 (1 year and 11 months)
Integration and further development of a CRM module as an extension of the OX App Suite, with the aim of mapping business relationships and sales processes of small and medium-sized enterprises directly within the existing groupware.
The project included both server-side extensions and the integration of new CRM functionalities into the existing web interfaces.
The project involved the development of additional server components (Java, REST/JSON) and the expansion of web-based user interfaces within the OX App Suite to fully integrate CRM functions such as business opportunities, customer information, appointment management, and team planning. A significant area of responsibility was the migration of existing calendar data from external systems into the OX App Suite based on ICS files. Additionally, functions for color synchronization of calendars via CalDAV were developed to ensure a consistent display across different clients.
Furthermore, an additional team calendar view was conceived and implemented, enabling improved resource planning and appointment overview.

Development of server-side CRM components (Java, REST/JSON) to extend the OX App Suite
Implementation of new frontend functions for CRM workflows (HTML, JavaScript, CSS) → integrated user experience within the existing groupware
Calendar migration from external systems using Java & ICS processing → secure and consistent data transfer into the OX App Suite
Expansion of CalDAV interfaces for transferring calendar colors to external clients → improved usability and consistent display on mobile and desktop devices
Conception and implementation of a team-oriented calendar view → optimized appointment and resource planning in collaborative environments
Quality assurance through automated tests (JUnit, Cypress) and code reviews
JavaScript Java HTML Calendar Management CSS