Ralf K. - Senior Java Developer, Consultant

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Frankfurt am Main, Germany

Experience

Nov 2022 - Jun 2025

2 years 8 months

Senior Java Developer, Consultant

Dataport AÖR

Maintenance and further development of the Java/Swing-based @rtus FormsEditor.
Design and development of a graphical formula editor based on Google Blockly to represent a project-specific DSL, including parsing and code generation.
Implementation of pixel-precise synchronization between the editor and print preview to improve the user experience.

Jan 2022 - Oct 2022

10 months

Senior Java Developer, Consultant

ING DiBa

Maintenance and modernization of legacy systems (Ramon, SODA).
Conducting performance analyses and implementing tuning measures.
Improving code quality by creating and extending JUnit tests.

Jul 2017 - Dec 2021

4 years 6 months

Senior Java Developer, Consultant

DB Systel GmbH

Ensuring operation and continuous development of multiple critical legacy systems.
Migrating and modernizing Java applications (from Java 8 to 11).

Jul 2015 - Jun 2017

2 years

Java Developer, Conceptual Design

DB Systel GmbH

Development of a solution for consistency checking of a complex data model.
Design and implementation of a system for importing and distributed calculation of timetable data.
Identification and resolution of performance bottlenecks through systematic profiling.

Sep 2013 - Mar 2015

1 year 7 months

Java Developer, Consultant

Deutsche Bank AG

Onboarding applications from Postbank and Deutsche Bank into the central configuration and deployment system.
Further development of system components, including a Swing-based submission support.
Developing a data migration solution for migrating legacy data into the newly developed configuration management solution.

Jan 2013 - Apr 2013

4 months

Hybrid

iOS Architect & Developer

AirBerlin (for Sevenval GmbH)

Designed and architected a hybrid app (iPhone/iPad) combining web content with native iOS features.

Sep 2012 - Mar 2013

7 months

Architecture Consulting & Development

WildGigs GmbH

Provided architecture consulting for system renewal and developed prototypes as well as SAP interfaces (SOAP/JEE).

Sep 2011 - Mar 2012

7 months

Co-Project Lead & iOS Development

VWD/Gevasys

Led the iOS team and developed a framework for building financial information apps.

Dec 2009 - Jan 2011

1 year 2 months

Architecture & Development

Deutsche Bank Global Markets

Developed reporting tools and admin clients in a high-performance financial environment.

Jan 2008 - Present

17 years 9 months

Architect/Developer

FINARX GmbH

Focus: Mobile projects for iOS

Oct 2007 - May 2009

1 year 8 months

Architecture & Development

Vodafone D2 (for CGI)

Integration of ATG Outreach for e-marketing campaigns and connection to LDAP user management.

May 2006 - Nov 2006

7 months

Architecture & Development

DB Fuhrpark Service

Development of a migration strategy to replace legacy systems with a service-oriented architecture (SOA) based on Eclipse RCP, Spring, and Hibernate.

Dec 2004 - Aug 2005

9 months

Architecture & Development

DAB Bank

Architecture and development of a new securities trading application based on the ATG Dynamo Suite.
Performance analysis and resolution of a memory leak.

Jun 2004 - Sep 2004

4 months

Architecture & Team Leadership

TUI Infotec

Analysis and architecture of a reusable, multi-tenant portal framework for TUI brands (tui.de, etc.) with a focus on component-based development.

Dec 2002 - May 2003

6 months

Design & Development

T-Online

Design and development of a portal framework, including a shopping solution and automated UI tests.

Jul 2002 - Present

23 years 3 months

Architect, Developer, Consultant

Freelance IT Specialist

May 2000 - Dec 2001

1 year 8 months

Architecture & Development

Dresdner Bank AG

Architecture and development of a transaction banking portal and an online securities trading application.

Jan 2000 - Dec 2002

3 years

Principal Consultant

Ceta GmbH / entory AG

Jan 1996 - Dec 1999

4 years

Programmer & Project Manager

CRI Deutschland GmbH

Summary

As an experienced freelancer with over 25 years of project experience, I work with companies to develop concepts and architectures for demanding, pragmatic, and sustainable software solutions.

My technological focus is on complex systems in the Java/JEE environment, from service-oriented architecture (SOA) to implementing backend services and web portals. In addition, I have extensive expertise in native iOS app development with Objective-C and Cocoa Touch.

In projects, I take on the role of architect, senior developer, or technical lead of teams (up to 10 people).

My broad industry experience in sectors such as the public sector, banking, insurance, telecommunications, and logistics enables me to quickly adapt to new domains.