Hi! I'm Sergej,

Extend the API-Platform (PHP) based backend stack

• Implement complex resolvers in the GraphQL API-layer
• Extend the Doctrine ORM-Layer which used a PostgreSQL database
• Model and implement entities with complex relationships and corresponding fixtures, migrations and required services

Extend GitlabCI and Docker Compose based deployment

• Implement test-setup for unit-tests with Jest
• Implement integration-tests with CodeceptJS
• Contribute to Docker Compose setup

Extend VueJS Frontend

• Introduce the functional library RamdaJS to handle data-transformations in the frontend effectively
• Implement a performance-optimized multi-level project-resource-planning calender by using a recycler list and functional components with optimized render functions

Component library development

• various architectural advancements and critical improvements to the ng-packager based component library
• the creation of complex components such as contenteditable and date-range-picker implementations.
• contributions to the frontend-modules by implementing sophisticated features for high level monitoring

Leading the frontend and UX alignment of a supply chain management platform

• creating a shared component library and frontend development workflow.
• aligning the diverse stacks and responsible teams on the basis of the library integration.
• uniting the microservice application frontends, which included VueJS, React and even jQuery stacks on the basis of WebComponents.
• providing a living styleguide fo the integration of the library in the diverse architectures.
• fostering a common understanding of coding standards and current JS language features. To achieve the later I gave workshops on ES6+ and frontend related issues and tutored individual developers.

Test-Decorators

Concept and co-development of a useful library for a declarative definition and parameterization of Test-Suites and Unit-Tests via TypeScript/ES-Decorators.

Create CSV Editor Electron App with VueJS frontend

• Create a desktop app to import, export and maintain the employee data of the evangelical mission work Bruderhand e.V.
• Use the cross-platform NodeJS framework Electron storing CSV-data in SQLite
• Feature a material design frontend implemented in VueJS.

Create a Single-Page Google Maps App with embedded Multi-Page CMS content

• Contribute to the a Django and Wagtail-CMS backend and especially Webpack and a VueJS frontend with PostCSS.
• Creating a interactive restaurant map with filterable results and a responsive design as an SPA within within a traditional MPA
• Implementing dynamic hydration of CMS configured server-side-rendered restaurant-pages, modules and widgets with frontend-data
• Providing Frontend-multilingualism

Frontend modularization & component library development for a distributed system

• Modularization of the Frontend-Code and migration of the derived components and patterns into a pattern library
• Design and implementation of a declarative and namespaced frontend internationalization using TypeScript decorators
• Realization of functional frontend features such as the Checkout process
• Co-development of the Webtrekk and GTM tracking

White-label shop system development: PHP-Backend and AngularJS Frontend

• Extend the project architecture by creating a configuration management backend and frontend to persist shop configurations and enables feature toggling
• Implement frontend features in the project, which used Grunt as it's build system, LESS as the Preprocessor and RequireJS as the module-loader

Design and Development of an AngularJS based component library

• Development of a pattern library with Gulp, SCSS, AngularJS and PHP
• Provision the frontend components in a structured and searchable component library
• Visualization of the components in the branding of the diverse shops.

Symfony based PHP-Project

• Contribute to the backend of a Symfony-based finance portal project.
• Contribute to the Twig-Frontend of said project.

Java Backend for a sales app

My Task was the co-development of an admin interface for the internal sales application. The interface was build within a Spring MVC multi-modul Maven Project, which was functioning as the backend for an iOS App, which was used by the sales department. My contribution included:

• requirements analysis, design, development and testing of the admin interface
• extension of the existing modules regarding REST-implementation and reporting

Continuous Integration System for IOS-Apps

For the afore mentioned iOS-App I have also developed and implemented a continuous integration architecture. The Jenkins based CI process fulfills the following requirements:

• Automated testing of new app versions upon VCS updates
• Automated building of the app by a Jenkins-Slave via Xcode
• Automated provision of the build in a Maven Webapp to be downloaded by iOS-Devices

Development of hybrid apps

• Prototype a hybrid app alternative of the existing native "SureNow" app with AngularJS, jQuery Mobile (angular-jqm) and PhoneGap.
• Evaluate whether a hybrid redesign of the app should be undertaken.