Rolf Gardewischke - Oracle PL/SQL Developer with Java

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Hamburg, Germany

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Experience

Jan 2019 - Aug 2025

6 years 8 months

Developer & Designer

Sicherheitsbehörden

Migration of a case management system with numerous interfaces to other systems from Spring and Activiti to a Java JEE application
Further development toward a cloud application
Consulting, development, requirements analysis, specification and design
Coordination with upstream and downstream systems
Data modeling, programming and implementation
Support with code reviews and ensuring clean code in the PL/SQL context
Documentation in Confluence
Troubleshooting of PL/SQL applications, including log analysis, session tracing and performance profiling
Optimization and tuning measures in the PL/SQL environment
Knowledge transfer and onboarding of new employees
Use of Jira for task management, progress tracking and sprint planning

Jul 2017 - Dec 2018

1 year 6 months

Developer & Designer

Otto GmbH & Co. KGaA

Extension of receivables management and implementation of new business requirements
Approach for further development toward a cloud application
Consulting, development, requirements analysis, specification and design
Coordination with upstream and downstream systems
Data modeling, programming and implementation
Testing the application with utPLSQL
Support with code reviews and ensuring clean code in the PL/SQL context
Documentation in MS Office
Troubleshooting of PL/SQL applications, including log analysis, session tracing and performance profiling
Optimization and tuning measures in the PL/SQL environment
Knowledge transfer and onboarding of new employees
Use of Jira for task management, progress tracking and sprint planning

Feb 2017 - Jun 2017

5 months

Developer & Designer

Otto GmbH & Co. KGaA

Extension of supplier processing and implementation of new business requirements
Consulting, development, requirements analysis, specification and design
Coordination with upstream and downstream systems
Data modeling, programming and implementation
Testing the application with utPLSQL
Support with code reviews and ensuring clean code in the PL/SQL context
Documentation in MS Office
Troubleshooting of PL/SQL applications, including log analysis, session tracing and performance profiling
Optimization and tuning measures in the PL/SQL environment
Knowledge transfer and onboarding of new employees
Use of Jira for task management, progress tracking and sprint planning

Sep 2016 - Feb 2017

6 months

Developer

MMP Services

Creation of a configuration tool for direct marketing systems using Ruby on Rails
Consulting and development

Sep 2016 - Jan 2017

5 months

Developer & Designer

Deutsche Post Brief

Oracle DB migration and extension of interfaces from Oracle 11 to Oracle 12
Consulting, development and coaching of internal developers
Adoption and customization of the existing database schema using Oracle Data Pump
Customization and extension of PL/SQL packages
Data migration using Oracle Data Pump
Creation of unit tests with Java/Spring

Jul 2013 - Aug 2016

3 years 2 months

Developer & Designer

Otto GmbH & Co. KGaA

New development of a backend system for processing customer orders in multichannel retail
Consulting and development
Setting up a test environment
Coaching internal developers

Jul 2012 - Jun 2013

1 year

Developer & Designer

Bombardier

Maintenance of a train deployment planning system
Consulting and development
Coaching internal developers

Jun 2011 - Feb 2012

9 months

Developer & Designer

Deutschepost Brief

Migration of the Deutschepost Brief track-and-trace system hardware and software
Consulting and development
Setting up a VM for the development team
Taking over and adapting the existing database schema with Oracle Data Pump
Data migration with Oracle Data Pump
Taking over a document archive
Supporting performance measurements
Adapting existing Maven builds
Converting System V packages to RPM
Adapting scripts, C++ interface programs, and JUnit tests
Creating load scenarios with JMeter
Creating system documentation
Migration of a document archive

Nov 2003 - May 2011

7 years 7 months

Developer & Designer

Deutschepost Brief

Extending the Brief track-and-trace system by adding and expanding various interfaces and components
Setting up a VM for the development team
Taking over and adapting the existing database schema with Oracle Data Pump
Data migration with Oracle Data Pump
Supporting performance measurements
Adapting existing Maven builds
Converting System V packages to RPM
Adapting scripts, C++ interface programs, and JUnit tests
Creating load scenarios with JMeter

Dec 2002 - Oct 2003

11 months

Developer & Designer

Deutschepost Brief

Further development of Brief track and trace
Migration of an existing document archive from Reliant Unix to Solaris
Extending various interfaces
Adapting C++ backend processes
Consulting and development
Coaching internal developers

Jul 2001 - Nov 2002

1 year 5 months

Developer & Designer

Deutschepost Brief

Migration of Track and Trace Brief from Reliant Unix to Sun Solaris
Consulting and development

Jun 1999 - Jun 2001

2 years 1 month

Developer & Designer

Deutschepost Brief

Further development of Track and Trace Brief with migration from Reliant Unix to Sun Solaris
Creation of data transfer scripts
Optimization and performance measurements on an HV system
Creation of C/C++ programs for data conversion
Package creation on Unix systems
Creation of PL/SQL procedures for statistical data analysis
Creation of import functions for an Oracle database
Extension of C++ processes to control a document archive
Extension of a Java application
Creation of interface concepts
Consulting and development

Jul 1998 - Apr 1999

10 months

Development and Design

Dräger

Calibration of a CO2 sensor: determination of limits and characteristic values from raw data for report generation
Consulting and development

Sep 1994 - Apr 1999

4 years 8 months

Development and Design

AFS

Object-oriented programming of a system to support a refueling service at numerous airports
Consulting and development

Jan 1994 - Aug 2025

31 years 8 months

Freelancer

Apr 1993 - Jul 2001

8 years 4 months

Development and Design

EFT Gummiwaren

Development of an order management system in Clipper for managing customer and item master data, order entry, invoice creation, dunning procedures, and statistical evaluations
Consulting and development

Apr 1993 - Sep 1994

1 year 6 months

Independent Development and Design

Bendig Inkasso

Development of a system for managing debtors and debt cases in Clipper
Consulting and development

Aug 1992 - Feb 1993

7 months

Development and Design

Siemens AG

Creation of an order processing system in a testing and diagnostic center using Informix with 4GL
Consulting and development

Industry experience

See where this freelancer has spent most of their professional time.

Experienced in Transportation, Manufacturing, Government and Administration, Retail, Aerospace and Defense, and Banking and Finance.

Transportation

Manufacturing

Government and Administration

Retail

Aerospace and Defense

Banking and Finance

Business area experience

See which departments and functions this freelancer has contributed to most.

Experienced in Information Technology, Accounting, Business Intelligence, Project Management, Product Development, and Finance.

Information Technology

Accounting

Business Intelligence

Project Management

Product Development

Finance

Summary

Focus areas

Oracle databases (up to version 19c) – development and design of PL/SQL solutions and database models
Performance optimization and tuning of Oracle databases
Java development – backend-oriented with a focus on maintainable, scalable, high-performance applications

Industries

Public administration, retail & services, logistics, postal & parcel services, rail transport, IT services, media marketing, rubber industry, aerospace

Project experience

Project experience since 1992

Skills

Programming Languages & Notations

Oracle Pl/Sql
Sql
Qt
Bpmn
Delphi
Jpql
Groovy
Xml
Java & Java Ee
Oracle Forms
C++ & C
Bpmn Activiti
Jpa
Spring
Json

Tools

Jenkins
Confluence
Git & Tortoisegit
Bitbucket
Oracle Sql Developer
Intellij Idea
Oracle Data Modeler
Kubernetes
Cloud Development
Microsoft Copilot
Weblogic
Glassfish
Splunk
Shell Ksh & Bash
Supercsv
Jsf & Primefaces
Ms Office
Artifactory
Mattermost
Hp Alm
Oracle Data Pump
Mfc
Utpl/Sql
Ords
Oracle Advanced Queuing (Aq)
Oracle Audit Trail
Oracle Text
Oracle Vpd
Power Designer
Qt Creator
Jira
Fisheye
Svn
Sonarqube
Toad
Oracle Enterprise Manager
Aws
Jaxb
Chat Gpt
Payara 4 & 5
Cdi
Maven
Serenity
Crucible
Gitlab
Github Copilot
Microsoft Visual Studio

Methods & Techniques

Scrum
Agile Development
Ci/Cd
Db Performance Optimization
Pair Programming
Unit Tests

Databases & Operating Systems

Oracle Db Up To 19c
Mysql
Windows 10
Sun Solaris
Redhat Linux
Centos
Ubuntu
Dbms Aq

Other

Test Management
Stakeholder Management
Cherwell Service Management
Project Management

Additional It Qualifications

Sap Abap
C
C++ Under Windows And Unix
Java
Ai (Diploma Thesis On Fleet Deployment Planning Using Ga Algorithm)

Personality

Open-Minded Personality, Committed To Finding Balance.

Languages

German

Native

English

Advanced

Education

Sep 1992 - Aug 1998

FH Wedel

Diplom Ingenieur Technische Informatik · Technical Computer Science · Wedel, Germany

Statistics

Experience

Total positions 18

Experience in Transportation 13 y

Avg length 4 y

Longest experience 31 y 7 m

Expertise

Recent roles Developer & Designer, Developer, Development and Design

Main industries Transportation, Manufacturing, Government and Administration

Main business areas Information Technology, Accounting, Business Intelligence

Qualifications

Highest degree Bachelor

Profile

Member since

October 2025

Last update

October 2026

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Frequently asked questions

Have questions? Find more information here.

Rolf is based in Hamburg, Germany.

Rolf speaks the following languages: German (Native), English (Advanced).

Rolf has at least 33 years of experience. During this time, Rolf has worked in at least 5 different roles and for 12 different companies. The average length of individual experience is 2 years and 10 months. Note that Rolf may not have shared all experience and actually has more experience.

Based on recent experience, Rolf would be well-suited for roles such as: Developer & Designer, Developer, Development and Design.

Rolf's most recent position is Developer & Designer at Sicherheitsbehörden.

In recent years, Rolf has worked for Sicherheitsbehörden and Freelancer.

Rolf is most experienced in industries like Transportation, Manufacturing, and Government and Administration. Rolf also has some experience in Retail, Aerospace and Defense, and Banking and Finance.

Rolf is most experienced in business areas like Information Technology, Accounting, and Business Intelligence. Rolf also has some experience in Project Management, Product Development, and Finance.

Rolf has recently worked in industries like Government and Administration.

Rolf has recently worked in business areas like Information Technology and Project Management.

Rolf holds a Bachelor in Technical Computer Science from FH Wedel.

The availability of Rolf needs to be confirmed.

Daily rate distribution

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<€800 €800-960 €960-1120 €1120-1280 €1440+

The rates shown represent the typical market range for freelancers in this position based on recent contracts on our platform.

Average rates for similar positions

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Daily rate avg. 946 €

The average daily rate is the mean of all daily rates from recent contracts of comparable freelancers on our platform.

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750

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Median rate 956 €

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.