2021 ? 2022: Content-Gateway

Role: Software Architect, Fullstack Developer

Customer: confidential

Tasks:

• Challenges:
  • Undocumented and changing information silos had to be tapped into and formatted appropriately
  • MongoDB was chosen for storage, with GraphQL for data provision
  • Due to expected changes and variably structured content, the system was designed to be generic, with some standard queries set up as a "facade" over it
  • The solution architecture initially included batch loaders, with message queues for push notifications planned for a later stage.
• Architecture & development of a "Content Gateway":
  • I contributed to the overall architecture, connected various interfaces (http, REST, GraphQL, JS-Libraries) to a MongoDB
  • I made content available via GraphQL. I programmed loaders for different formats (including Ghost, YouTube, Discord, etc.)
  • I integrated the frontend wizard for administration
    

Skills:

TypeScript, JavaScript, Node.js, fp-ts, GraphQL, React, REST, GraphQL, JSON, MongoDB, Docker, Kanban, Git

2019 - 2019: NOVA Neues Preissystem ÖV Schweiz

Role: Solution- and Software Architect

Customer: T-Systems, SBB

Tasks:

• For the project, I collaborated with the business on site and the remote development team in Russia to create the concept, solution- and software architecture for the new quota engine, which searches and manages discounted prices for various SBB products in real-time. One challenge was the huge number of variants that needed to be considered, as well as an easy way for the administration of contingents and products
• Additionally, I was responsible for the refactoring/redesign of the public SOAP interfaces of the NOVA system, through which all prices are queried and all SBB products are booked

Skills:

DDD, Java 8, Spring, Redis, SOAP, Openshift, Docker, Kubernetes, Splunk, Maven, Git, Confluence, Jira, Scrum, Bitbucket, Confluence, XMLSpy, Oracle

2018 - 2018: Consulting for a Blockchain Startup

Role: Technical Consultant, Prototyping, Business Modell

Customer: DREMZZ

Tasks:

• I advised the startup "Dremzz", which aims to build a decentralized platform for freelancers based on blockchain technology
• My consultancy covered the use of technologies for the web and blockchain, as well as their impact on user experience and the business model
• I also advised on the approach for the Pre-ICO and ICO
• Additionally, I programmed various prototypes to test the technology's viability and applicability to the planned business case

Skills:

Stellar, Stellar Smart Contracts, Ethereum, Solidity, IPFS, Reputation Protocols, NodeJS, React, React Native, Electron, Angular, JavaScript, TypeScript, Java, Spring

2017 - 2017: NOVA Neues Preissystem ÖV Schweiz

Role: SPoC, Business Analyst, Technical Consultant

Customer: T-Systems, SBB

Tasks:

• T-Systems, in collaboration with SBB (Swiss Federal Railways), developed a platform for tariff calculation of all public transportation offers in Switzerland (DV and Verbund), essentially a pricing system. This system is integrated not only with SBB's web shop, ticket machines, and manned sales but also with other integrators like transport associations
• As a representative for T-Systems within the NOVA project, I served as the single point of contact for SBB teams integrating the system (web shop, Casa, mobile, ticket machines, and internal systems) as well as for external integrators. I analyzed requirements, identified problems, and proposed technical and professional solutions
• The most challenging part was a not too good relationship between the parties, and quite a bit of blaming. Good thing I had my coaching education and experience available

2014 - 2015: ActiveMQ Messaging Solution

Role: Software Architect, Senior Software Developer (Backend)

Customer: confidential

Tasks:

• My role involved replacing FTP/PHP transfers with ActiveMQ and JMS Messaging for a large online electronics retailer. The interfaces between the backend (Navision, ERP), product management (PHP), and country-specific shops (PHP) were previously implemented via FTP and batch jobs, leading to delays in updating product availability, descriptions, etc. (5-15 minutes)
• To facilitate near-time data transfer, the interface is being gradually replaced with a Java-based messaging solution instead of PHP
• My role included designing the concept (message broker, types and numbers of queues, distribution & forwarding, software architecture), setting up the software project to receive, process, and write messages to various databases, assisting with infrastructure setup, implementing solutions for the most important/complex messages, including error handling and logging, and ongoing support and performance optimization
• Really challenging was the total absence of any documentation, as well as a long chain of side effects

Skills:

Java 8, Spring 4, Spring Boot, SpringData, JPA, Spring JMS, Junit, REST, JAXB, XML, ActiveMQ , MySQL, MS SQL, PHP, Mercurial, Maven, Jenkins

2014 - 2014: Berufskleidung / Industriebedarf Webshop

Role: Software Architect, Senior Software Developer

Customer: CID, Engelbert Strauss

Tasks:

• As a software architect and team leader (backend) for the online shop of a leading German supplier of workwear and industrial supplies, I created and enhanced the architecture for various extensions (including order notifications, export for Google Shopping feed, extended product attributes) in SOA style, and conducted code reviews
• I analyzed operational issues
• A major challenge was integrating a variety of many different products, each with distinct attributes and relations
• Today one would use a NoSQL, but the SQL database was already in production

Skills:

.Net, C#, MS SQL, NHibernate, Razor, XML, ASP, MVC Framework,MS MQ, NServiceBus, Visual Studio, Windsor Castle, Jira, Crucible, Git, TeamCity, Fisheye

2013 - 2013: övKarte

Role: Software Architect, Kanban Coach, Teamlead, Senior Backend Developer, Architekt im Bereich CRM, Marketing& Vertrieb

Customer: SBB (Schweizerische Bundes Bahnen)

Tasks:

• I participated in the analysis, architecture, and development of the "Public Transport Card" project. From mid-2015, GA's and HTA's (equivalent to Bahncard 100 and Bahncard 50) were to be electronically stored on the Public Transport Card, with more products to follow. This necessitated a conversion of operational processes and a change in the architectural landscape
• Really challenging was that simultaneously, parts of the application landscape were being converted or newly developed towards a SOA. My tasks included creating and coordinating the requirements of the complex SVS project (Renovation of Sales Systems) and the new processes of the Public Transport Card for the CRM team (Partners & Contracts), creating the necessary architecture for the planned transformations (software architecture and data models) based on SOA specifications. Additionally, I was overseeing the implementation, including the development of parts of the new Partner and Contract applications. A major challenge was coordinating and connecting the SAP interface
• Furthermore, I introduced Kanban as a new agile management tool together with the team leader, adapting and monitoring the Kanban process according to the necessary structure for the team, projects, and the overarching organization

Skills:

Sparx EA, UML, Java, Java EE, Dozer, JUnit, Mockito, SAP Interfaces, Webservices, JAX-WS, XML, JPA, Hibernate, Oracle, SVN, Jenkins, Sonar, Websphere 8.5, Kanban

2012 - 2012: (Entwicklung einer Email Lösung

Role: Senior Backend Developer

Customer: confidential

Tasks:

• The client is developing a system based on the "Registered Email" specifications
• My responsibilities included developing several backend components, as well as parts of their design/architecture in coordination with the business requirements
• The design is REST-based, with JRuby on the frontend
• The backend modules also uses REST and features a layered architecture consisting of resource, business, and data access layers
• All modules are fully covered with unit and integration tests, with a continuous build set up in Jenkins
• Additionally, my role ? beyond the "normal" development tasks within the Scrum team ? included the evaluation, documentation, and introduction of Spring-Data and Query-DSL

Skills:

Java 1.7, REST, Jersey, XML, JSON, Dozer, JPA, Hibernate, Spring 3.1, Spring Security, Spring-Data, Query-DSL, Hamcrest, Mockito, Tomcat, Oracle Database, IntelliJ, Git, Maven, Jenkins, Virtualbox, Scrum

2010 - 2010: Social Games und Cross Promotion Network Prototype

Role: CTO

Customer: Frameplay

Tasks:

Frameplay, a German startup in the social games sector, was founded in March 2010

• Part 1: Spread Star Concept + Prototype Spreadstar is a type of cross-promotion for social games, displaying banners across games to exchange impressions and clicks. My role involved contributing to the business concept, translating it into an architecture, and creating prototypes using suitable technologies. The application runs on Google Application Engine (Google Cloud), utilizing Spring 3 with Spring MVC and JPA support. The prototype leverages Google Data Store, Google Memcache (Jcache Interface), and the Task-Queue Service
• Part 2: Social Games My responsibility included selecting technologies and developing the architecture for the framework that the games are built on. This involved abstracting modules such as the Social API, Server Core, Payment Provider, and Virtual Currency, employing enterprise technology enhanced with real-time components. I also contributed to the codevelopment and enhancement of game concepts and managed development firms (some overseas) using agile, iterative project management/Scrum, supported by tools like Jira/Greenhopper, Skype, TWiki, and Subversion. This included regular code reviews, improvements, prototype programming of architecture/technology examples, etc. Additionally, I oversee server installation and administration, including maintenance and backup scripts, and determine the technology and tools used internally

Skills:

Google App Engine (GAE), Java 6, Spring 3, JPA, Hibernate, Spring MVC, Spring Security, Flash, Flex, BlazeDS, Java NIO, JavaScript, Java Messaging (JMS), Java Concurrency, Java Executor Framework, PostgreSQL, SQL, MySQL, Debian Linux, facebook API, OpenSocial, OAuth, Eclipse, Maven, Subversion, Jira, bash, Maintanance Scripts, TWiki

2009 - 2009: Pattern Science Prototypes

Role: Solution Architect, Technical Project Lead

Customer: CID, Pattern Science AG

Tasks:

• Creation of concepts and prototypes for applications using semantic techniques (Text Mining, Data Mining, Web Mining). I led the team (evolutionary prototyping/agile development with Scrum character) and conducted code reviews
• (A) I developed a financial ontology (in OWL) to represent a securities universe. I managed the project/architecture for developing a securities explorer based on it (facetted browsing). (3-person team, about 3 months) and conducted code reviews
• (B) I created the architecture for a prototype of a ticketing system with automatic clustering/automatic ticket assignment. (8-person team) and conducted code reviews. (C) Conceptualized and technically led/managed the creation of a prototype of a system for automatic discovery of topics on the web (Trend Detection, Topic Detection, Web Crawling). (8-person team) and conducted code reviews

Skills:

Web 3.0, Semantics, Text Mining, Data Mining, Web Mining, Web Crawling, Sentiment Analysis, NLP, NER (Named Entity Recognition), RDF, OWL, Clustering, Trend Detection, C#, .NET, Flash, Java, SOAP, Oracle Triple Store, Sesame, BigOWLim

2008 - 2008: FAZ.net, FAZfinance.net ? Portal Relaunch

Role: Technical Project Lead, Software Architect

Customer: CID

Tasks:

• I supported the relaunch of FAZ's (a news and financial portal in Germany) portal landscape
• I served as the technical project leader and managed the approximately 20-person team across the contracted system house, its subsidiary in Lithuania, and three external companies at different locations
• Responsibilities included creating software architectures, detailing business concepts, integrating heterogeneous systems (Java backends, .NET backends, various data providers), test and release planning, and task management
• Topics addressed included SSO, content management and selection (custom CMS development based on SOA, SaaS option), entity recognition, semantic methods (which were quite new at that time and experimental), SEO, custom portal framework development, content management, performance tuning, operations, and Java<->.NET integration via web services

Skills:

.NET, C#, WCF, Webservices, Velocity, Microsoft Visual Studio, Microsoft SQL Server, Windsor Castle, Velocity, NHibernate, Webservices, RDF, OWL, Triple Stores, JavaScript, JMS, Subversion, Jira, Confluence, Java, Tomcat, MySQL, Axis, POI, XML, Excel, Access, Tomcat, JSF, JDBC, Eclipse, Ant, Mondrian, Jpivot, bagjas