Hans L. - Software Development

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Buchen, Germany

Experience

Jan 2022 - Dec 2024

3 years

Software for vehicle registration

Development of web services for processing vehicle registrations (registration, transfer of ownership, de-registration)
Implemented with Spring Boot, JMS (ActiveMQ), Oracle, Tomcat/JBoss, TomEE, OpenSearch

Jan 2021 - Dec 2021

1 year

Software for insurance

Migration of large data sets from Adabas with transfer to a REST interface in OpenShift
Development of microservices for data warehouse with interfaces to and from enterprise applications
Development of REST services with HAL
Implemented with Java 11, Spring, Oracle, OpenAPI, OpenShift, Kafka

Jan 2004 - Jun 2005

1 year 6 months

Consumption/charges billing

Water Management Association

New development of a multi-tier application for billing water consumption, sewer charges, waste disposal, installation orders, and an integrated accounting software (general ledger, debtors, creditors)
Migration and preparation of data sets from the predecessor software
Interface to E-Post and PDF archive
Implemented with Java (Swing, Vaadin), RMI, JDBC, and MS SQL Server

Oct 2003 - Dec 2003

3 months

Porting custom software

Garden and Landscaping Company

Porting software for invoicing, payment monitoring, cost accounting, payroll, and estimating to Delphi 8 on Windows XP and MS SQL Server 2000
Implemented with Object Pascal (Delphi 8) and MS SQL Server

Aug 2001 - Oct 2001

3 months

Harbor railway information system (order management)

Deutsche Bahn

Design and development of a harbor railway information system with a platform-independent, distributed, and scalable technical architecture
Modeling (UML), Java coaching, development of workflow components
Implemented with Java (EJB, JMS, RMI/IIOP), WebLogic 6, CONNECT:Direct, Oracle

Jan 2001 - Dec 2020

20 years

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Deutsche Bahn

Development and maintenance (refactoring) of the schedule planning system CFP based on J2EE architecture (application components, interfaces)
Development and maintenance (refactoring) of the train monitoring software (FplV-ZugUE, later TraCE) with Swing client and J2EE architecture, components for CTG, batches and services for MVS/CICS
Concept for access control with LSO and multi-tenancy
Design, development and maintenance/extension of the software for international train data exchange Hermes (HERM-LSO) with HTML/JSF client, COBOL batches, CICS online modules, XML parser, MQ Series
Migration of the message hub Comgate to the Amazon cloud using Java, C, RTE, Python, Shell, Tomcat 9, TradeXpress, Amazon DynamoDB, Connect:Direct, MQ Series
Maintenance and further development of CAM FplV with COBOL, MQ Series, DB2
New development of software for handling orders in a port for MVS/CICS (Natural, Adabas)
Modeling of a data mart for evaluating punctuality measurements (PME), creating technical interface and component specifications, implementation of ETL processes with Enterprise Architect, Java, JBoss, Spring, iBatis, Java rich client with Eclipse RCP
New development of the software for managing empty cars (EWDS) with integration of a route optimizer developed in C++ (Java, C++, JSF, JBoss, Spring, Hibernate, JNI)
Technical upgrades: WebLogic up to version 12.2.1, JBoss EAP up to version 7.2.2, Java up to version 11, OpenJDK, MQ Series; migration from RichFaces to PrimeFaces
Extension of LSO-LSO software with additional validations to prevent XSS attacks (Java, ESAPI)

Jan 2001 - Aug 2001

8 months

Technical architecture for a port rail information system (operations control, order management)

Development of a platform-independent, distributed and scalable technical architecture based on J2EE with Java clients and HTML clients
Development of architecture components for message control and distribution with JMS, converting messages from XML to external formats (e.g. EDIFACT) and vice versa
Interface to file transfer software, evaluation of application servers and XML-EDIFACT conversion tools
Testing cluster behavior and development of guidelines for application development
Implemented with Java (EJB, JMS, RMI/IIOP), WebLogic 6, CONNECT:Direct, Oracle

Nov 2000 - Dec 2000

2 months

Porting a land statistics application to Windows NT

Grundstücks-Treuhand-Gesellschaft

Porting a land statistics application to Windows NT with MS SQL Server 7
Designing and setting up the database, porting data from Unix/ISAM, designing the user interfaces, modeling
Implementation with C++

Jan 2000 - Dec 2000

1 year

Development of a home savings calculator for Windows 2000

Bausparkasse

Modeling, development and testing of a platform-independent calculation core to simulate contract terms and changes
Development of a test program for automated testing of the calculation core
Implemented with Java

Jan 1998 - Dec 1999

2 years

Development of a graphical editor for an object-oriented database

Versicherungsverband

Independent development of a graphical editor for an object-oriented database on different platforms (Windows, OS/2, Unix)
Modeling and programming in Java (Swing)
Development with JBuilder2 on Windows and text editors on OS/2, reuse of the Java classes in other projects

Jan 1996 - Dec 1998

3 years

Monitoring staff qualifications; capturing and analyzing production data

Ball Bearing Factory

Developed software to monitor staff qualifications and capture and analyze production data
Windows network with OS/2 server and clients running Windows 3.1x/NT/95
Implemented using Object Pascal (Delphi)

Jan 1990 - Dec 1992

3 years

Porting standard software for Opel dealers

Siemens-Nixdorf AG

Supported porting the standard software for Opel dealers from the Nixdorf Quattro system to Unix
Used custom-developed porting tools and database

Jan 1989 - Dec 1990

2 years

Tools for porting Nixdorf Quattro to Unix

Developed a compiler to translate BASIC programs for Nixdorf Quattro into C for Unix
Developed tools to convert files from Quattro format to Unix format
Developed an indexed database for Unix to simplify software porting
Developed a user-friendly print spooler for Unix

Summary

Programming languages: Java, C++, C, JavaScript, Cobol, Object Pascal (Delphi), Basic, SQL, PL/SQL, RTE, Python; XSLT
Frameworks: Java EE (EJB 1,2,3), JAX-RS, JAX-WS, JAX-RPC, JMS; Spring; Ibatis/Mybatis, Hibernate; Swing, JavaFX, Vaadin, Eclipse RCP, JSF 2, PrimeFaces, RichFaces
Application servers: WebLogic, JBoss EAP, Tomcat
Tools: Eclipse, Spring Tool Suite, IntelliJ IDEA, Android Studio, NetBeans; Enterprise Architect, Eclipse Papyrus; Maven, Gradle, Ant, Liquibase; Jenkins, Artifactory; ClearCase, ClearQuest, Git, Subversion
Industries: Automotive trade, building societies, construction companies, energy utilities, wholesale, manufacturing, public administration, public transport operators (Deutsche Bahn), insurance
Databases: Oracle, DB2, MS SQL Server, PostgreSQL; OpenSearch; object-oriented; Amazon DynamoDB
Focus areas: Independent development of user software and tools; object-oriented modeling/development (UML); refactoring; Java, Java EE