Hans L.-Self-employed
Check rate
Experience
Public administration
- Development of web services for processing vehicle registrations (registration, transfer, deregistration)
- Implemented with Spring Boot, JMS (ActiveMQ), Oracle, Tomcat/JBoss, TomEE, OpenSearch
Insurance
- Migration of large data sets from Adabas with handover to a REST interface in OpenShift
- Development of microservices for data warehouse with interfaces from and to business applications
- Development of REST services with HAL
- Implemented with Java 11, Spring, Oracle, OpenApi, OpenShift, Kafka
Water association
- New development of a multi-tier software for billing water consumption, sewer fees, waste disposal, installation orders, and integrated accounting software (general ledger, accounts receivable, accounts payable)
- Adoption and preparation of the data sets from the predecessor software
- Interface to E-Post; PDF archive
- Implemented with Java (Swing, Vaadin), RMI, JDBC; DB: MS SQL Server
Gardening and landscaping company
- Porting of software for invoicing, payment monitoring, cost accounting, payroll recording, and costing to Delphi 8 for Windows XP and MS SQL Server 2000
- Implemented with Object Pascal (Delphi 8); DB: MS SQL Server
Deutsche Bahn
Development and maintenance (refactoring) of the CFP timetable planning system based on the J2EE architecture: application components, interfaces; WebLogic, Entity Beans, Message Driven Beans, Session Beans, JAX-RPC, XSLT; Java rich client with Swing, RPC; DB: Oracle, DB2
Development and maintenance (refactoring) of the software for train monitoring (FplV-ZugUE/TraCE): client and server components with Swing, J2EE; CTG; batches and services for MVS/CICS; concept for access control with LSO; multi-client capability; WebLogic with Spring, Ibatis/MyBatis, JAX-WS, JAXB, CTG, FTP; DB: Oracle, DB2, PostgreSQL
Design, development, and maintenance/extension of Hermes (HERM-LSO) for international exchange of train data: HTML/JSF, J2EE; CTG; Cobol batches, CICS online modules, XML parser, MQ Series; JBoss, Spring, Hibernate, CTG; DB2
Migration of the message hub Comgate to the Amazon cloud with 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 ports for MVS/CICS (Natural, Adabas)
Modeling of a data mart for analysis of punctuality measurements (PME); creation of technical interface and component specifications; implementation of the ETL processes with Enterprise Architect, Java, JBoss, Spring, Ibatis; Java rich client with Eclipse RCP; DB: Oracle
New development of software for managing empty wagons (EWDS) with integration of a route optimizer developed in C++: Java, C++, JSF; JBoss, Spring, Hibernate, JNI; DB: Oracle
Technical upgrades: WebLogic up to 12.2.1, JBoss EAP up to 7.2.2, Java up to 11, OpenJDK, MQ Series; migration from RichFaces to PrimeFaces; processes: LSO-LSO, SD-LSO, GWD, GWVA, CDD, RST, PME, HERM-LSO, SVI, TraCE, ZuBA, CFP
Extension of the LSO-LSO software with additional validations to defend against XSS attacks with Java and ESAPI
Grundstücks-Treuhand-Gesellschaft
- Porting of a land statistics system to Windows NT with MS SQL Server 7
- Design and setup of the database; porting of the data stocks from Unix/ISAM to Windows NT
- Design of the user interface; modeling; implementation with C++
Bausparkasse
- Development of a building savings calculator for Windows 2000
- Modeling; development and testing of a platform-independent calculation core to simulate contract progress and contract changes
- Development of a test program for machine testing of the calculation core
- Implemented with Java
Versicherungsverband
- Independent development of a graphical editor for an object-oriented database
- Modeling; programming with Java (Swing) on OS/2, Unix, Windows
- Development on Windows with JBuilder2, on OS/2 with text editors
- Proprietary database access classes for other projects
Kugellager-Fabrik
- Development of software for monitoring staff qualifications and production data collection and analysis
- Windows network with OS/2 server, Windows 3.1x/NT/95
- Implemented with Object Pascal (Delphi)
Siemens-Nixdorf AG
- Support with the porting of standard software for OPEL dealers from the Nixdorf Quattro system to Unix
- Use of self-developed porting tools and database
Self-employed
- Development of a compiler for translating Basic programs for Nixdorf Quattro into C for Unix
- Development of tools for converting files from Quattro format to Unix format
- Development of an index-oriented database for Unix to make porting easier
- Development of a user-friendly print spooler for Unix
Industry experience
See where this freelancer has spent most of their professional time.
Experienced in Transportation, Information Technology, Government and Administration, Insurance, Manufacturing, and Utilities.
Business area experience
See which departments and functions this freelancer has contributed to most.
Experienced in Information Technology, Business Intelligence, Quality Assurance, Product Development, and Accounting.
Skills
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, Java Fx, 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: Car Sales, Building Societies, Construction Companies, Energy Supply Companies, Wholesale, Industry, Public Administration, Transport Companies (Deutsche Bahn), Insurance
Databases: Oracle, Db2, Ms Sql Server, Postgresql, Opensearch, Object-Oriented Databases, Amazon Dynamodb
Focus: Independent Development Of Application Software And Tools, Object-Oriented Modeling/Development (Uml), Refactoring, Java, Java Ee
Languages
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Experience
Expertise
Profile
Frequently asked questions
Have questions? Find more information here.
Hans is based in Buchen, Germany and can operate in on-site, hybrid, and remote work models.
Hans speaks the following languages: German (Native), English (Elementary).
Hans has at least 33 years of experience. During this time, Hans has worked in at least 1 role and for 10 different companies. The average length of individual experience is 3 years. Note that Hans may not have shared all experience and actually has more experience.
Based on recent experience, Hans would be well-suited for roles such as: Self-employed.
In recent years, Hans has worked for Public administration and Insurance.
Hans is most experienced in industries like Transportation, Information Technology, and Government and Administration. Hans also has some experience in Manufacturing, Insurance, and Utilities.
Hans is most experienced in business areas like Information Technology, Product Development, and Business Intelligence. Hans also has some experience in Quality Assurance and Accounting.
Hans has recently worked in industries like Government and Administration and Insurance.
Hans has recently worked in business areas like Information Technology and Business Intelligence.
The availability of Hans needs to be confirmed.
Daily rate distribution
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Average rates for similar positions
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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 7 Sep 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
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