Full-Stack Software Engineer + Strong Backend Background + NLP & Machine Learning

6/2018 – 12/2019

SmartContracts on Ethereum, Aeternity and EOS. Token-Sale-Platform (Symfony/Sylius/PHP+MySql), Crossplatform-App-Development with Flutter, Backend and REST-API with Symfony/PHP

Blockchain (allg.), EOS.IO, Flutter, Mysql, Symfony

1/2018 – 10/2018

Smart-Contracts mit Solidity auf Basis von Ethereum, ERC 721-TokenContract, Vesting Contract, Token-Sale-Platform auf Basis von Symfony/Sylius (PHP) und MySql als Datenbank.

Blockchain (allg.), Solidity, Symfony

1/2017 – 12/2017

Crossplatform App-Development with React-Native and native libraries both for iOS (Objective-C) and Android (Java).
Backend-Development with Loopback (NodeJS-Library) and MongoDB as backend database

Java (allg.), Objective-C, React Native

7/2016 – offen

Crossplatform-App-Development with React-Native. As an ongoing project, from time to time I do further development and/or maintenance like ReactNative-upgrades, bug fixing and developing new features

Java (allg.), Objective-C, JavaScript, React Native

4/2016 – offen

Backend und REST-API für Content-Verwaltung auf Basis von Symfony/Sylius (PHP), App-Entwicklung mit React-Native, native Libraries für DMS und Encryption für iOS und Android

Mysql, iOS, Software Architecture, Android Entwicklung, Java (allg.), Objective-C, Softwareentwicklung (allg.), JavaScript, PHP, React Native, Symfony

5/2015 – 2/2016

With a small team the web portal -Hyperlink entfernt-.[...].de has been build and published under my direction. The portal is germanys biggest directory of local farmer shops and gives them visibility in the internet. I developed the backend of [...] as well as the native iOS-App.

The core system of the portal is also used as a white-label solution with multi-client capabilities from other companies and drives several industry portals in the DACH-region.

My technical competencies:

- Symfony 2
- MySql 5.6
- PHP 5.4-5.6, Javascript, LESS
- Composer, Puppet, Vagrant, Grunt, Bower, NPM
- geographical circumcircle search
- dealing with APIs from Google, Geonames, Facebook, Twitter, Factual and many more
- SEO optimization
- high performance web application / high performance database
- AWS-Components: S3, EC2 and Cloudfront
- Cloudinary
- native iOS Apps

Mysql, Symfony, PHP

4/2013 – 12/2015

In the first 2 years I was part of the refactoring team where the whole software stack of [...]  eCommerce platform -Hyperlink entfernt- has been rebuild. The main goal was to create a high reliable and high performance eCommerce platform for this large german marketplace, which has been achieved successfully.

2014 we started a new project called [...] (-Hyperlink entfernt-), building everything from scratch with modern technologies and agile methodologies.

My technical responsibilities for [...] are the native iOS-part of the app development as well the backend of the platform including various APIs (e.g. Facebook API and Cloudinary). I also built the social media integration and supported the developer team in all topics.

Technical specialties:
- PHP 5.5, JavaScript
- Objective-C
- Javascript
- Test Driven Development (very high coverage)
- MySQL (Percona) 5.6, Liquibase
- ElasticSearch
- Symfony 2, PHPUnit, Bootstrap, Kiwi
- Node, npm, Bower, Composer, Grunt
- Vagrant, Puppet
- Facebook SDK
- Factual SDK
- Cloudinary
- Google Places API
- Titanium AppCelerator
- Kiwi (TDD for native iOS Apps written in Objective-C)
- JasmineJS

Mysql, iOS, Agile Methodologie, Objective-C, Mobile Application Development, iOS Entwicklung, PHP, JavaScript, E-Commerce

5/2011 – 3/2013

With a team of 6 developers we built a web-based ERP software for the insurance sector. Besides the integration of finance-related interfaces and data imports like MT940 and DTAUS, I was responsible for performance optimizations, for both frontend and backend, particularly the Microsoft SQL Server database.

Technical skills:

- C# / ASP.NET
- Javascript, Coffeescript
- Microsoft SQL Server

Transact-Sql, Microsoft SQL-Server (MS SQL), C#, ASP.NET, JavaScript

1/2011 – 1/2012

As the leading software developer for this eHealth Startup based in Düsseldorf (Germany) I was responsible for the development of the whole software stack.

The software stack can be summarized with the following components:
- database (MySql)
- backend (PHP)
- frontend (JavaScript, HTML)
- APIs
- data imports/-exports
- Apps
- Testdriven development for both backend and frontend

Mysql, PHP

11/2008 – 4/2011

C#, ASP.NET, MS SQL Server

Microsoft SQL-Server (MS SQL), C#, ASP.NET

2/2006 – 10/2008

I was member of the web application development team and amongst other things responsible for the development of the real time auction system and several backend tools.

Web Application-, Libraries- & Database Development (LAMP)
Linux, Apache, MySQL, PHP

Administration von Datenbanken, JavaScript, Jquery, Mysql, PHP

8/1998 – 1/2006

Software-Engineer (Windows-Application, C++, .NET-Framework, MS-SQL-Server, Web-Applications with ASP.NET)

.Net Framework (Microsoft), C#, C++, Microsoft SQL-Server (MS SQL)

1/1996 – 6/1998

Freelancer as Software-Developer (Pascal, Delphi, C++) for multiple Clients.

I developed a "Duty Roaster" software for hospitals and build tools and apps around this topic.

C, Delphi