Rainer L.-Senior IT Consultant, Senior Software Architect, Senior Software Developer, Senior DevOps Engineer
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Experience
Senior IT Consultant, Senior Software Architect, Senior Software Developer, Senior DevOps Engineer
Techniker Krankenkasse
Automation of the database major / minor releases for the TKeasy project
Concept for database major / minor release automation
Assessment of the current state
Evaluation of Redgate Flyway functionalities
Concept development
Products: Redgate Flyway, GitHub, Quest, Erwin Data Modeller, Oracle, Atlassian Jira, Atlassian Confluence
Knowledge: Docker, Continuous Delivery, Continuous Integration, Redgate Flyway, Major Releases, Minor Releases
Senior IT Consultant, Senior Software Architect, Senior Software Developer
ASS Werbe GmbH
Migration from Microsoft Exchange 2010 to Microsoft Exchange Online
Migration from Microsoft Windows 7 to Microsoft Windows 10
Migration from Microsoft Office to Microsoft 365
Outsourcing of the entire IT infrastructure
Development of a data platform for incoming and outgoing data
Provision of standards-based interfaces
Replacement of in-house Delphi developments
IT training for an employee
Training sessions
Products: Apache Airflow, PostgreSQL, Microsoft 365, Exchange 2010, Exchange Online, Microsoft Access, MS SQL Server, OpenStreetMap, GitLab, Git, PyCharm, Nominatim
Knowledge: Apache Airflow, PostgreSQL, PostGIS, Python, Docker, Kubernetes, SDAW, GV100, Delphi, OpenStreetMap, geodata processing, geocoding, REST, Connexion, Flask, SQLAlchemy, object-relational mapping, Linux, Windows, OpenAPI
Senior IT Consultant, Senior Software Architect, Senior Software Developer
Südwestfalen-IT (SIT)
Design, maintenance, further development, quality assurance and documentation of the ExtensionAPI and the client components
Technical and functional responsibility for connecting form servers to Kommunalportal.NRW
Extension development
Coaching and knowledge transfer
Design, maintenance, quality assurance and documentation of the standard ExtensionAPI SOAP web service interfaces
Design, implementation, maintenance, quality assurance and documentation of the ExtensionAPI Java client components
Design, implementation, maintenance, quality assurance and documentation of the Java HelloWorld Extension based on the ExtensionAPI
Design, implementation, maintenance, quality assurance and documentation of the ExtensionAPI C# client components
Design, implementation, maintenance, quality assurance and documentation of the C# HelloWorld Extension based on the ExtensionAPI
Design, implementation, maintenance, quality assurance and documentation of the ExtensionAPI test framework
Design, implementation, maintenance, quality assurance and documentation of the high-performance and scalable Java Enterprise middleware application Form-Solutions Extension based on the ExtensionAPI
Design and documentation of the Java Feedback Extension based on the ExtensionAPI
Design, implementation, maintenance, quality assurance and documentation of the Java LinkChecker application based on REST services
Design, implementation, maintenance, quality assurance and documentation of a DocsAsCode-based documentation approach
Design, implementation, maintenance, quality assurance and documentation of Continuous Integration / Continuous Delivery (CI/CD) and Continuous Inspection pipelines
Requirements, release, configuration, documentation, test and build management activities
Products: Maven, Apache Solr, Apache Axis, Artifactory, Asciidoctor, C#, Eclipse, EclipseLink, Elastic-Stack, ELK-Stack, Form-Solutions, Git, GitLab, Java, Jenkins, JetBrains Rider, JUnit, Jupiter, MySQL, Payara, SoapUI, SonarQube, .NET, Dotnet, Forms.IO, Camunda BPM, SwaggerUI, Docker, Podman, Arquillian
Knowledge: EJB3, J2EE, JEE, Jakarta EE, Continuous Integration, Continuous Inspection, Scrum, Java, JSF, HTML5, CSS3, JBatch, AsciiDoc, DocsAsCode, SOAP, REST, JAX-RS, JAX-WS, OpenAPI, JAXB, JAXP, SAX, StAX, WSDL, XML, XSD, XSLT, XÖV-Standards, SQL, Web Services, JDBC, Microprofile, Portals, BPM, Genericode, Use Cases, UML, PlantUML, C4 Model, ExtensionAPI, Servicekonto.NRW, Kommunalportal.NRW, OZG
Volunteer IT Lecturer
Rheinische Akademie Köln gGmbH
Senior IT Consultant, DevOps Engineer
Deutsche Post DHL Group
Replacement of an old CRM system
Transition to Salesforce with Talend as middleware
Further development of build management
Development of a Continuous Integration / Continuous Delivery (CI/CD) pipeline for the Talend middleware artifacts
Integration of the group-wide Artifactory instances
Git configuration
Support during the deployment process (Salesforce project)
Implementation of Continuous Inspection for the Talend artifacts and the Salesforce project
Implementation of test automation
Setup of an OpenShift cluster for the Talend middleware stack
Products: Red Hat OpenShift, Talend DSP, Talend Middleware, Salesforce, Sonarqube, Jenkins, Artifactory
Knowledge: Scrum, Agile development methods, Java, JEE, Red Hat OpenShift
Senior IT Consultant, Performance Analyst
Debeka
Technical and functional consulting for the development of a highly performant, scalable enterprise application (JEE, Weblogic, JSP, JQuery, HTML5, CSS3) in the BO/P area
Identification of possible corrective measures to optimize performance
Products: Apache Maven, Artifactory, Eclipse, Java, Jenkins, SonarQube, Atlassian Confluence, Atlassian Jira, ELK-Stack, Elastic-Stack, Git, WebLogic Enterprise Edition, Elastic-ALM
Knowledge: EJB3, J2EE, JEE, Continuous Integration, Continuous Inspection, Scrum, Java, JSP, JQuery, HTML5, CSS3
Senior IT Consultant, DevOps Engineer
ThyssenKrupp Steel Europe AG
- Manufacturing Execution System (MES)
- Products: Apache Maven, Artifactory, Eclipse, Eclipse RCP, Eclipse Tycho, Java, Jenkins, SonarQube, OrientDB, Atlassian Confluence, Atlassian Jira, Atlassian Bitbucket, Elastic Search, ELK-Stack, Elastic-Stack, RedHat Enterprise Linux (RHEL), Git, GitLab, WebLogic Enterprise Edition, WebLogic, Liquibase
- Knowledge: EJB3, J2EE, JEE, Eclipse RCP, Eclipse P2, Eclipse Tycho, Continuous Integration, Continuous Inspection, Configuration and build management, Maven Plugins, Scrum, Graph Database, NoSQL, Elastic Search
Senior IT Consultant, Configuration Manager
Gothaer-Systems GmbH
Development of a CRM system to support the Gothaer Group's multichannel strategy and to map business processes more efficiently
Participation in the Software Configuration Management (SCM) team for the Group's release management
Creation, packaging and delivery of releases and bug fixes
Support of project and release management for development and pre-integration environments
Maintenance and further development of the build and deployment processes
Ensuring and supporting the tools in use
Planning, concept, implementation and testing of the migration of the Goliath application from Maven 2 to Maven 3
Planning, design, setup, management and maintenance of a Continuous Integration system (Nexus, Jenkins, Build Slaves, SonarQube)
Planning and management of the migration of the Source Control Management system Git to the in-house Subversion system
Evaluation of the Review Board code review solution
Development of an automated solution to connect all CRM projects to the Code Quality Server
Development of a prototype solution for automated dependency and impact analysis
Development of a solution for the automated migration of all in-house projects to Maven
Cross-project contact for build and configuration management
Products: Apache Ant, Apache Maven, Apache Subversion, Eclipse, Eclipse Aether, Eclipse Scout, Eclipse Tycho, IBM Websphere, Java, Jenkins, SonarSource, SonarQube, Sonatype Nexus, TeamViewer, OrientDB, Atlassian Confluence, Atlassian Jira, HP ALM, IBM DB2, IBM RAD, JUnit, IBM Lotus Notes, SoapUI, UC4, RedHat Enterprise Linux (RHEL), PostgreSQL, Review Board, Git
Knowledge: EJB 2.1, EJB3, Ant Tasks, J2EE, JEE, Eclipse RCP, XML, XML Schema (XSD), XSL, XSLT, JAXB, JAXP, SAX, StAX, SOAP Web Services, SOA, WSDL, GSM, Continuous Integration, Continuous Inspection, Configuration and build management, Scrum, Kanban
Senior IT Consultant, Senior JEE Developer
HSBC Trinkaus & Burkhardt AG
Support with Java application development for the Client On-Boarding and Account Maintenance (COBAM) - Foreign Account Tax Compliance Act (FATCA) project
Recording and processing of customer master data
Design of business processes with jBPM
Products: IBM Websphere, IBM Websphere Portal Server, IBM Rational Architect, Vaadin, Spring, Java, IBM DB2, IBM UDM, Eclipse
Knowledge: UML, Use Cases, Portals, Portlets, EJB3, J2EE, JEE, Master Data, FATCA, BPM
Senior IT Consultant
Sparda Datenverarbeitung eG
Maintenance and further development of the PRISMA sales portal of the Sparda banking group
Further development of frontend (Portlet) and backend components (Webservice) for the cooperation partner DEVK
Adjustments due to the SEPA conversion
Conversion of the Baufi, DEVK and Premium/Commission Accounting portlets to the outstanding balance insurer Credit Life
Concept, architecture, implementation and testing of the Java Web Service (JAX-WS)-based backend components
Familiarization with the functional and technical standards of BIPRO e.V.
Review and refactoring
Products: Apache Ant, Apache Axis, Apache CXF, Apache Maven, Apache Struts, Apache Subversion, Atlassian Confluence, Atlassian Jira, IBM DB2, IBM Websphere Portal Server, Eclipse, Hibernate, Java, JBoss Application Server, Jenkins, JUnit, MBS, Rumba, Sonatype Nexus, SoapUI, SVN
Knowledge: EJB3, ESB, J2EE, JEE, JAXB, JAX-WS, JDBC, JPA, JSP, Portals, Portlets, SOA, SOAP, SQL, Web Services, WSDL, WSS, XML, XML Schema (XSD), XSL, XSLT, Scrum, Kanban
Software Architect / Developer, Maven Expert, JBoss Expert
AG der Dillinger Hüttenwerke
Replacement of the steel mill control software with a Java Enterprise solution in the Phoenix project
Maintenance and further development of the productive Java Enterprise subprojects of the steel mill control system (SLS)
Introduction of Eclipse Team Project Sets and consolidation of Maven artifacts
Implementation of various Maven plugins
Migration from JBoss 4.2.3.GA to JBoss EAP 5.1.0
SVN structure migration and release management
Consulting and coaching regarding JBoss, JEE/J2EE and Maven
Products: Apache Ant, Apache Maven, Apache Subversion, Atlassian Confluence, Atlassian Jira, CVS, Eclipse, Enterprise Architect, Hibernate, Informix, Java, JBoss Application Server, JBoss EAP, Jenkins, JFC (Swing), JUnit, Oracle, Sonatype Nexus, SVN
Knowledge: EJB3, J2EE, JEE, Java Message Service (JMS), Java Management Extensions (JMX), JDBC, JPA, Maven Plugin, SQL, XML, XML Schema (XSD), Scrum, Kanban
Software Architect / Developer, Quality / Test Management
Verband der Vereine Creditreform e.V.
Replacement of the legacy AS/400 application Orbis for providing foreign trade credit reports
Development of an XML schema and a subsystem for importing credit report deliveries
Development of a fail-safe Output Management System (OMS) for generating and archiving standard letters
Design, architecture and implementation of standards-based subsystems
Products: Apache ActiveMQ, Apache Axis, Apache Commons IO, Apache HttpComponents, Apache Maven, Apache PDFBox, Apache XML Graphics, Apache Subversion, Artifactory, Atlassian Confluence, Atlassian Jira, BEA WebLogic, CUPS, Eclipse, Ehcache, ELO, IBM Toolbox for Java, Inubit BPM-Suite, Java, JUnit, Saxon, SoapUI, Teamcity, Topcom Kofax Communication Server, XMLUnit
Knowledge: Customer Information Quality (CIQ), DOM, EJB3, JAXB, JAXP, JAX-WS, J2EE, JEE, JCA, JCR, JMS, JMX, PDF, SAX, StAX, SVG, Servlet, SOAP, Web Services, XPath, XML, XML Schema (XSD), XSL, XSL-FO, XSLT, Extensible Metadata Platform (XMP), Scrum
Software Architect / Developer, Senior IT Consultant
Santander Consumer Bank AG
Implementation of business rules based on ILOG JRules in the DecisionBox
Migration of the credit decision for Risk Management Durables
Moving the dealer rating score calculation to the DecisionBox
Architecture and implementation of the DecisionBox - PropertyManager component for controlling the rule sets
Implementation of authentication, audit security, versioning and reporting
Architecture of a JAXP-based XML pipeline to support agile QA processes
XML data transformation and target-actual comparison
Code review and refactoring
Products: Apache Ant, Apache Maven, Apache Xalan, CVS, Eclipse, EclipseLink, Hibernate, IBM Websphere, ILOG JRules, Java, JBoss Application Server, JUnit, OpenJPA, Oracle, Saxon, XMLUnit
Knowledge: Ant Tasks, EJB 2.1, EJB3, JAXP, JDBC, J2EE, JEE, JPA, Servlet, SQL, XPath, XProc, XML, XML Schema (XSD), XSL, XSLT, Scrum
Software Architect / Developer, Senior IT Consultant
Steria Mummert Consulting AG
Performance analysis and tuning for the Tributum product (taxable capital gains)
Quality assurance and test automation
Runtime analysis of the entire Tributum application
Architecture and implementation of a JAXP-based XML pipeline for mass testing use cases
Validation of test inputs and automated test documentation
Provision of test sets
Products: Apache Ant, Apache Maven, Apache Xalan, Apache XML Graphics, BEA WebLogic, Eclipse, HP Quality Center, IBM Websphere MQ, Java, JProbe, JUnit, Oracle, Saxon, SVN
Knowledge: Ant Tasks, EJB 2.1, EJB3, JAXP, JDBC, J2EE, JEE, JMX, Maven Plugin, SQL, Web Services, XML, XPath, XML Schema (XSD), XSL, XSL-FO, XSLT, Scrum, Abgeltungssteuer
Business Rules Management Expert
Bundesdruckerei GmbH
Prototypical implementation of the Border Control Platform as a Proof of Concept (PoC)
Planning and implementation of the service-oriented solution based on BEA Aqualogic BPM and Drools
Integration of the VISOCORE ePass reader and fingerprint scanner using SOAP
Development of a web frontend for visualizing biometric data and process steps
Evaluation of various Business Process and Business Rules Management systems
Products: Apache Axis, Apache Jackrabbit, Apache Maven, Apache Tomcat, BEA AquaLogic BPM, Biomiddle, COSA BPM, Drools, Eclipse, ILOG JRules, Java, JBoss Application Server, JBoss jBPM, JUnit, Oracle Business Rules, VISOCORE
Knowledge: EJB 2.1, EJB3, J2EE, JEE, Java Rule Engine API (JSR 94), JSP, JCR, JMX, Maven Plugin, SOAP, UML, Scrum
Founder, Project Management, Software Architect / Developer
Open Source Project @ SourceForge
Rules Framework: Supporting the development, integration and monitoring of Java Rules-based enterprise applications
Development of Maven 2 plugins for compiling and testing Rule Execution Sets
JSR 94-based J2EE Connector Architecture 1.5 Resource Adapter
Stateful and Stateless Decision Services based on JSR 94
XDP2FO: Collection of XSL Transformation (XSLT) stylesheets for converting Adobe XML Data Package (XDP) into W3C XSL Formatting Objects (XSL-FO)
Products: Adobe LiveCycle ES, Antenna House XSL Formatter, Apache Maven, Apache Xalan, Apache XML Graphics, Barcode4J, CVS, Eclipse, EXSLT, FormCalc, Java, JBoss, JESS, JUnit, RenderX XEP, Saxon, SVN
Knowledge: CSS, DOM, EJB3, J2EE, JEE, JMX, PDF, SAX, StAX, SVG, XDP, XFA, XForms, XML, XPath, XSLT
Management, Design and Implementation of Subprojects
TeamBank AG (formerly norisbank AG)
Design and implementation of the easyCredit installment loan application
Responsibility for the printing component and prepress
Creation of loan contract documents and print templates
Provision of data for quality reporting and commission accounting
Architecture of a system-independent, multi-tenant and multilingual printing component
Integration of a Java Rule Engine (Drools)
Redesign and further development of the ETL and reporting components
Architecture of a framework for integrating JSR 94-compliant Rule Engines (JESS, Drools)
Runtime analysis and performance tuning of the entire application
Products: Adobe LiveCycle Forms, Apache Ant, Apache Jackrabbit, Apache Maven, Apache FOP, Apache Struts, Atlassian Confluence, Atlassian Jira, Big Faceless Java PDF Library, Drools, Eclipse, Eclipse BIRT, iReport, iText, JasperReports, Java, JBoss Application Server, JProbe, JUnit, Oracle, Oracle Warehouse Builder (OWB), PL/SQL, RenderX XEP, Toad for Oracle, XDoclet
Knowledge: CWM, DOM, EJB 2.1, EJB3, J2EE, JEE, JSR 94, JSF, JSP, JAXB, JAXP, JCR, JDBC, JMX, Maven Plugin, PDF, SAX, SQL, StAX, UML, XFA, XLink, XML, XPath, XSL-FO, XSLT, Scrum
Project Manager, Software Developer
Internet Agency
Creation of a live meta-crawler for comparing offers and prices on the Internet (ShoppingScout24)
Design and implementation of the Java Servlet-based transformation pipeline
Development of tools for the automatic generation of components
Project management and quality assurance
Products: Java, JavaScript, Perl, Sun Forte 4 Java, CVS
Knowledge: CGI, CSS, HTML, Java Servlets, SAX, XML, XSLT
Software Developer / Architect, Business Planning Tool Lead, Reengineering Specialist
Bayer AG (Bayer Technology Services)
BTS PlaTo: Creation of an intranet application for strategic and operational planning
Design of an XML-based solution for form and report generation
ProperView Reengineering: Porting the XML layer and the Command Design Pattern to Java
Implementation of the database layer via JDBC and redesign of user management
Development of a Java chart component based on web standards (similar to SVG)
Technical consulting for the design of DTD and XML Schema for thermophysical substance data
Design and implementation of an open Java Search API
Development of a Java thick client as a front end for the Bayer substance database
Customization of the administration console and redesign of the CGI-Perl interface
Design of the Single-Sign-On (SSO) extension and integration of the PassGo SSO applet
Taking over support and further development of the intranet application for the substance database
Products: Apache Ant, Batik, FOP, POI, Tomcat, Eclipse, Java, MS Excel, Oracle DB, PL/SQL, Visual SourceSafe, Together CC, JavaHelp, JProbe, Symantec Visual Cafe, MS IIS
Knowledge: CSS, DOM, DTD, JavaScript, Java Servlets, JSP, JavaBeans, LDAP, Oracle XSU, PDF, SAX, SMTP, SQL, SVG, XForms, XHTML, XML, XSL-FO, XSLT, XSQL, Java-COM Bridge, HTTP, ISAPI, SSL, OLE, UML
Industry experience
See where this freelancer has spent most of their professional time.
Experienced in Information Technology, Banking and Finance, Education, Chemical, Metals and Mining, and Insurance.
Business area experience
See which departments and functions this freelancer has contributed to most.
Experienced in Information Technology, Business Intelligence, Product Development, Project Management, and Quality Assurance.
Skills
- Agile Methods
- Bi
- Bpm
- Brm
- Configuration Management
- Devops
- Dwh
- Java/J2ee/Jee
- Oss
- Senior It Consulting
- Software Architecture / Development
Languages
Education
University entrance qualification
Master's degree program, minors in Philosophy and Phonetics · Musicology
FernUniversität in Hagen
Diploma degree program, minor in Business Administration · Computer Science · Hagen, Germany
Statistics
Experience
Global experience
Expertise
Qualifications
Profile
Frequently asked questions
Have questions? Find more information here.
Rainer is based in Cologne, Germany and prefers 100% remote projects.
Rainer speaks the following languages: German (Native), English (Intermediate), Latin (Intermediate).
Rainer has at least 27 years of experience. During this time, Rainer has worked in at least 16 different roles and for 19 different companies. The average length of individual experience is 1 year and 5 months. Note that Rainer may not have shared all experience and actually has more experience.
Based on recent experience, Rainer would be well-suited for roles such as: Senior IT Consultant, Senior Software Architect, Senior Software Developer, Senior DevOps Engineer, Senior IT Consultant, Senior Software Architect, Senior Software Developer, Volunteer IT Lecturer.
Rainer's most recent position is Senior IT Consultant, Senior Software Architect, Senior Software Developer, Senior DevOps Engineer at Techniker Krankenkasse.
In recent years, Rainer has worked for Techniker Krankenkasse, ASS Werbe GmbH, Südwestfalen-IT (SIT), and Rheinische Akademie Köln gGmbH.
Rainer is most experienced in industries like Information Technology, Banking and Finance, and Education. Rainer also has some experience in Chemical, Metals and Mining, and Government and Administration.
Rainer is most experienced in business areas like Information Technology, Business Intelligence, and Product Development. Rainer also has some experience in Project Management and Quality Assurance.
Rainer has recently worked in industries like Education, Information Technology, and Government and Administration.
Rainer has recently worked in business areas like Information Technology, Product Development, and Quality Assurance.
Rainer holds a Master in Musicology.
Rainer is immediately available full-time for suitable projects.
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Average rates for similar positions
Rates are based on recent contracts and do not include FRATCH margin.
The average daily rate is the mean of all daily rates from recent contracts of comparable freelancers on our platform.
The median daily rate is the middle value of all daily rates — half of comparable freelancers charge less, half charge more. Unlike the average, it is barely affected by outliers.
Calculated based on our freelancers’ daily rates as of 17 Oct 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
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