Ola Van dunen - IT Lecturer

Berlin, Germany

Experience

Apr 2024 - Aug 2024

5 months

IT Lecturer

IT training in theory and practice for IT specialists in application development and system integration

Jun 2023 - Jan 2023

-1 years -4 months

Berlin, Germany

Product Development

Reseller Payment System

Design and prototyping of a solution to digitize the local ticket system
Tools/Environment: IntelliJ IDEA, Maven
Technologies: Java 11, Quarkus, PostgreSQL, OpenID Connect, OAuth2, Keycloak, UML
Team size: 4
Operating system: Linux
Version control: Git, GitLab

Oct 2022 - Nov 2023

1 year 2 months

Nuremberg, Germany

Senior Java Developer/DevOps

Public Authority

Maintenance and upkeep of existing application modules
Further development of additional requirements
Tools/Environment: IntelliJ IDEA, Maven
Technologies: Java 11/17, Kafka, Spring Boot, REST API, Cassandra, Angular 15, TypeScript, Selenium, Kubernetes, OIDC, OAuth2, Grafana, npm, Amazon S3
Version control: Git, Bitbucket
Methodology: Scrum
Team size: 12

Dec 2020 - Oct 2022

1 year 11 months

Hamburg, Germany

Software Engineer

Telefónica/TechMahindra

Extension of the existing portal and applications in distributed systems
Knowledge transfer to offshore colleagues for successful project handover
Design of software architectures to adapt the OIDC flow
Development of a proof of concept
Tools/Environment: IntelliJ IDEA, Maven, Postman
Technologies: RxJava, Java 11, Spring Boot, Oracle, Hazelcast, SQL, Kafka, OpenID Connect, OAuth2, mod_auth_openidc, Apache HTTP Server, AWS
Modeling language: UML 2.0
Operating system: Linux
Version control: Git, GitLab
Methodology: Scrum
Team size: 25

Jun 2020 - Nov 2020

6 months

Hanover, Germany

Senior Java Developer

Nord/LB

Extension of a credit portal for granting loans to companies
Analysis of business requirements
Introduction and design of a software architecture based on Domain-Driven Design
Tools/Environment: IntelliJ IDEA, Maven
Technologies: Java 8, JEE7, JSF, WAS, TomEE, Camunda BPMN, EclipseLink
Modeling language: UML 2.0
Operating system: Windows
Version control: Git, Gerrit
Methodology: Scrum
Team size: 4

Jul 2019 - Mar 2020

9 months

Berlin, Germany

Senior Java Developer

BerlinHyp

Building a loan portal for issuing loans to the real estate sector
Analyzing the functional requirements
Introducing and designing a software architecture based on Domain-Driven Design
Implementing REST interfaces based on CQRS, HATEOAS, and Event Sourcing
Tools/Environment: IntelliJ IDEA, Maven, Kubernetes, Keycloak
Technologies: REST, Java 8, JEE7, WildFly, Hibernate, GraphQL
Modeling language: UML 2.0
Operating system: Windows 7
Version control: Git, Bitbucket
Methodology: Scrum
Team size: 9

Mar 2019 - Jun 2019

4 months

Berlin, Germany

Software Engineer

Thales

Building an infrastructure to manage interlocking systems
Analyzing the system architecture
Analyzing the performance of the RabbitMQ message broker
Specifying software requirements
Implementing new RESTful endpoints
Reviewing implementations
Implementing unit and integration tests
Extending the Jenkins pipeline
Creating software documentation
Tools/Environment: IntelliJ IDEA, CF-CLI, Maven Pipeline, Cloud Foundry
Technologies: REST, Spring Boot, Spring Security, Jenkins, Maven, Groovy, Java 8, RabbitMQ, Oauth2, Hibernate, Eureka, SSO, Spring Cloud LoadBalancer
Modeling language: UML 2.0
Operating system: Windows 10
Version control: Git, Bitbucket
Methodology: Scrum
Team size: 7

Feb 2019 - Mar 2019

2 months

Berlin, Germany

Software Engineer

Nitrokey

Creating a proof of concept for secure user authentication
Analyzing the system architecture
Designing a software architecture
Implementing the proof of concept for an embedded system
Modularizing JDK 10
Creating software documentation
Tools/Environment: IntelliJ IDEA
Technologies: WSDL SOAP, Java 10, SASL, ISP
Modeling language: UML 2.0
Operating system: Linux
Version control: Git, GitLab
Team size: 3

Dec 2018 - Dec 2018

1 month

Berlin, Germany

Frontend Developer

Exodus Berlin

Developing a logo animation
Tools/Environment: WebStorm
Technologies: JavaScript, SCSS, Node.js, npm
Version control: Git
Team size: 2

Sep 2018 - Jan 2019

5 months

Hennigsdorf, Germany

Senior Java Developer

Yara WaterConnect

Development in digital farming
Tools/Environment: IntelliJ, YouTrack, Docker, Azure
Technologies: RESTful services, Spring Boot, SQL, Java 8, SSO, Hibernate, Kubernetes, Keycloak
Databases: Cosmos DB, MS SQL Server
Operating system: Linux
Version control: Git, GitHub, GitLab
Methodology: Scrum
Team size: 9

Jun 2018 - Aug 2018

3 months

Berlin, Germany

Senior Java Developer

RatePay

Development of a messaging system
Tools/Environment: IntelliJ, Jenkins, Docker
Technologies: Spring Boot, SQL, Java 8, Spring Batch, Hibernate, Kafka, Grafana
Databases: MySQL, PostgreSQL
Operating system: Linux
Version control: Git
Process model: Scrum
Team size: 8

Nov 2017 - Apr 2018

6 months

Berlin, Germany

Software Engineer

BEAN

Development of a GIS system
Tools/Environment: Emacs
Technologies: LeafletJS
Scripting/programming languages: JavaScript, Erlang, Vue.js
Database: Mnesia
Operating system: Linux
Version control: Git
Architecture: Java SE/Erlang/OTP
Application Container: Cowboy
Web Service: JSON-based REST services
Process model: Agile programming
Team size: 5

Jul 2017 - May 2018

11 months

Berlin, Germany

Senior Java Developer

WPK

Portal development for a JEE-based application
Tools/Environment: Eclipse, RAD, Maven, Sonar, Nexus, TeamCity
Technologies: Spring, JSF (Mojarra, PrimeFaces), jQuery, Tomcat, WebSphere, SQL
Databases: AS400, DB2
Operating system: Windows 10
Version control: SVN
Process model: Agile software development
Team size: 5

May 2017 - Jul 2017

3 months

Berlin, Germany

Software Engineer

Zalando SE

Development of management software for controlling returns
Tools/Environment: IntelliJ IDEA, Stups, PIP, GitEye
Technologies: Spring Boot, AWS, Zign, AWS-KMS, Web Services (SOAP/REST), Docker, Grafana
Databases: PostgreSQL, Cassandra
Architecture: Microservices
Modeling language: UML 2.0
Operating system: Linux
Version control: Git
Process model: Kanban
Team size: 9

Jan 2017 - Apr 2017

4 months

Berlin, Germany

Java Developer

Arxes-Tolina

Frontend and backend development of a single page application/JEE application
Technologies: Spring MVC, Hibernate, JUnit, Q-DSL, Knockout, Promise, Bootstrap, REST web services
Tools: Eclipse, Maven, Grunt, npm, Gulp, SCSS, GitExtension
Database: Oracle
Operating system: Windows 10
Process model: Scrum
Version control: Git
Team size: 12

Sep 2016 - Sep 2016

1 month

Evaluation

Set up AngularJS with Spring Boot for evaluation in an Ivetime startup

May 2015 - Dec 2016

1 year 8 months

Hanover, Germany

Senior Java Developer

Service Center for Land Development and Agricultural Funding

Developed an application to manage and process agricultural applications
Swing/JEE development (backend and frontend)
Tools: Eclipse 4.3, SQL Developer
Technologies: Java 8, JEE 6.0, Spring Boot, Spring MVC, Swing, JUnit, JBOSS 4, Hibernate, JMock, PowerMock
Architecture: Microservices
Database: Oracle
Automation server: Jenkins
Version control: Subversion
Operating system: Windows 7
Methodologies: Continuous Integration/Delivery, daily stand-ups, short release cycles
Team size: 11

Jan 2015 - Apr 2015

4 months

Munich, Germany

Java Developer

Axa Group

Backend and frontend development in organizational programming
Enhanced existing legacy applications to generate documents
Fixed security vulnerabilities
Tools/IDE: Eclipse, SQL Developer
Technologies: JEE 6.0 Web Services, JUnit, Spring MVC 3.1, Struts, JSP, JBOSS, Tomcat
Databases: Oracle
Automation server: Jenkins
Version control: Subversion
Operating system: Windows 7
Team size: 3

Apr 2009 - Dec 2014

5 years 9 months

Hennigsdorf, Germany

Software Engineer

Bombardier Transportation

Developed a passenger TV system
Designed web services
Software architecture and system analysis
Gathered requirements
Backend and frontend development
Built an authentication and authorization frontend
Coached and coordinated with offshore project teams
Tools/IDE: NetBeans 8.0, MS Visio, Sparx EA 10, UML, IIS
Techniques/Methodology: OOA, OOD, DDD, UML, code reviews, pair programming
Technologies: J2EE 6, web services, JAX-WS, JPA, EclipseLink, JSF 2.0, JMS, RichFaces, PrimeFaces, MDB, EJB 3.0, JUnit 4.8.1, JavaScript, jQuery, Tomcat, Arquillian 1.1.2, GlassFish 3.1.2.2, shell scripts
Protocols: SOAP, HTTP/S, FTP, LDAP
Databases: Oracle 10g, MS SQL Server Express 2008, PostgreSQL 9.1
Build automation server: Jenkins
Version control systems: Rational ClearCase, MS VSS
Operating systems: Windows 2003/2008, embedded Linux
User management: MS Active Directory
Team size: 7

Jan 2008 - Jan 2010

2 years 1 month

Berlin, Germany

Senior Java Developer

In-house Development

In-house development for portal creation
Wrote a software requirements specification
Prototyping
Frontend development with Flex and ActionScript 3.0
Backend development in Java
Tools/IDE: Eclipse
Technologies: BlazeDS, Java 1.6, web services, SOAP, PayPal
Database: HSQLDB
Team size: 1

Jul 2007 - Mar 2009

1 year 9 months

Berlin, Germany

Senior Java Developer

Daimler Financial Services

Developed an administration application based on a J2EE application
System analysis
Created software requirements specifications
Software design and architecture
UML modeling
Frontend and backend development
Techniques/Methods: OOA, OOD, UML
Tools/IDE: WSAD
Technologies: J2EE 1.4, Java, WAS 6.0, JScript, JDO
Methodology: Code review, TDD, refactoring
Database: DB2
Version control: MKS
Team size: 6

Aug 2006 - Feb 2007

7 months

Berlin, Germany

Senior Java Developer

Siemens Nokia

Portal development for an international company in the telecommunications and electronics industry
Developed a J2EE-based application to manage and control requirements engineering
Prototyping
UML modeling as a basis for requirements gathering/specification
Tools/IDE: Eclipse 3.2, Subversive, Middlegen
Techniques/Methods: OOA, OOD, UML
Technologies: Java, J2EE, Tomcat 5.5, JSP, Servlets, CSS, XML, AJAX
Framework: Spring MVC
Database: MS SQL
Version control: SVN
Team size: 8

May 2006 - Aug 2006

4 months

Ostfildern, Germany

Java Developer

Falk Marco Polo Interactive

Server-side development for a publishing company and an IT service company as part of a web portal relaunch
Unit testing and implementation of server-side modules
Customization of views
Tools/IDE: Subclipse, Eclipse 3.1
Technologies: Java, J2EE, Castor, JSP, Tiles, CSS, JavaScript, XML
Framework: Struts 1.3.5
Database: Oracle
Web container: Tomcat 5.5
Operating system: Windows XP
Version control: SVN

Mar 2006 - Jun 2007

1 year 4 months

Berlin, Germany

Senior Java Developer

Jamba

Frontend development, redesign, and functional enhancement of an existing web-based application in digital content/community
Tools/IDE: Eclipse 3.2, Maven
Technologies: JEE, Java, Tomcat 5.5, JSP, Servlets, CSS, JavaScript, XML, AJAX
Frameworks: Spring MVC, Struts, Stripes, Hibernate
Database: Oracle 9i
Version control: CVS
Team size: 25-30

Feb 2006 - Mar 2006

2 months

Wolfsburg, Germany

Java Developer

Gedas

Backend development for an automotive IT company as part of a portal build
Developed the persistence layer
Tools: QMF, Eclipse 3.0
Technologies: Java, J2EE, Hibernate
Database: DB2
Operating system: Windows XP
Team size: 15

Jun 2005 - Jan 2006

8 months

Berlin, Germany

Java Developer

Siemens

Developed a workflow application that is integrated into an existing portal for an international telecommunications and electronics company
Analyzed existing business processes and developed a workflow
Data integration via an O/R mapper
Performance testing
Programming languages: Java, SQL, Stored Procedures
Technologies: J2EE, JSTL, Hibernate 3, DisplayTag, Spring MVC 1.2, JUnit 3.8
Techniques: OOA, OOD
Methodology: Code review, pair programming, refactoring
Tools/IDE: Eclipse 3.1, Subversion, Enterprise Manager
Database: MS SQL Server
Operating system: Windows XP
Team size: 8

Apr 2005 - May 2005

2 months

Berlin, Germany

Java Developer

n/a

Built a prototype of a web application for the entertainment industry
Architecture: Struts, J2EE, EJB
Tools/IDE: Eclipse 3.1, JBOSS-IDE, Xdoclet, Ant
Database: PostgreSQL 7.4
Operating system: Linux
Team size: 1

Jan 2005 - Mar 2005

3 months

Munich, Germany

Software Architect

Valley Forge

Created a software architecture concept and a test plan for an authoring system
Refactored existing software modules
Developed a new server-side application
Created a data model
Techniques: OOA, OOD
Technologies: Java, JDBC 3.0, Struts 1.2
Architecture: Swing
Tools/IDE: JUnit 3.8.1, Eclipse 3.1
Techniques/Methodology: OOA, OOD, UML
Database: MySQL 5.0.4
Operating system: Windows 2000
Team size: 3

Oct 2004 - Dec 2004

3 months

Berlin, Germany

Java Developer

T-Systems

Created web-based reports using the SmartView framework
Programming languages: Java, SQL, Stored Procedures
Technologies: JSP, Servlets 2.3
Tools/IDE: Eclipse 3.1
Database: Oracle 9i
Operating systems: Windows XP, Linux 2.4
Team size: 7

Jun 2004 - Sep 2004

4 months

Berlin, Germany

Java Developer

n/a

Provided web development support for a shop system developer
Detailed specification and development of interfaces for a mail and payment system
XML-based communication with external systems over HTTPS
Programming language: Java
Technologies: XML, Servlet 2.3
Tools/IDE: XMLSpy, JUnit, Eclipse 3.0, Castor-XML, Resin
Database: Tamino XML
Operating system: Windows 2000
Team size: 21

Feb 2004 - Feb 2004

1 month

Berlin, Germany

Java Developer

n/a

Developed a program for database analysis for an IT company with about 5 employees
Analyzed a Java-based application
Created a data model
Programming languages: Java, SQL
Technology: JDBC 3.0
Database: MySQL 4.0
Operating system: Windows 2000
Team size: 5

Jan 2004 - Jan 2004

1 month

Berlin, Germany

Java Developer

n/a

Built a prototype as an independent project
Developed a web application for an IT service provider
Designed and modeled data
Architectures: JSP/Servlets 2.3, Struts 1.2
Web server: Jakarta Tomcat 4.1
Programming language: Java
Tools/IDE: Eclipse 3.0, Ant 1.2
Database: PostgreSQL 7.3
Operating system: Linux Red Hat 9.0
Team size: 2

Jun 2003 - Dec 2003

7 months

Berlin, Germany

Java Developer

it-fws

Conducted code review and analysis of existing web applications for a Berlin banking company
Created technical documentation and performed quality assurance
Introduced JUnit
Technologies/methodology: JSP/Servlet 2.3, Struts 1.2, UML 1.5
Database: Oracle 8i
Programming languages: Java, SQL
Tools/IDE: Eclipse
Techniques/methodology: OOA, OOD, UML
Operating systems: Windows XP, Sun Solaris
Version control: CVS
Team size: 13

May 2003 - May 2003

1 month

Berlin, Germany

Java Developer

it-fws

Performed architecture analysis and software integration
Integrated a standalone application that communicates with Navision via sockets
Provided data based on XML/XML Schema
Used techniques: OOA, OOD
Architecture: J2EE 1.3, Castor, Swing
Programming language: Java
Operating system: Windows XP
Version control: CVS
Team size: 2

Feb 2003 - Apr 2003

3 months

Hamburg, Germany

Java Developer

it-fws

Continued prototype development of a mobile application for a clinic
Introduced the SavaJe operating system as an alternative on PDAs to improve performance
Expanded a standalone application
Programming language: Java
Methodology: Code review, TDD, Pair Programming, Extreme Programming, Test First
Tools/IDE: IntelliJ
Frameworks/technologies: JWAM, RMI, MIDP, Swing
Version control: CVS
Operating systems: Windows 2000/XP, SavaJe, Windows CE

Jan 2003 - Jun 2003

6 months

Berlin, Germany

Java Developer

it-fws

Framework design and analysis as part of an internal open source project
Technologies: JSP/Servlets 2.3, XML 1.0, XSLT, Struts 1.0
Programming languages: Java, SQL
Database: MySQL
Tools/IDE: Eclipse
Operating system: Windows XP
Version control: CVS
Team size: 2

Jan 2003 - Jan 2003

1 month

Potsdam, Germany

Java Developer

it-fws

Performed a data migration for a doctors' association
Migrated data from Sybase to MySQL
Redesigned the existing web application
Technologies/architecture: JSP/Servlet, Struts, EJB, JBOSS 3.0 (J2EE 1.2)
Methodology: Code review, pair programming, extreme programming, test first
Programming languages: Java, SQL
Description language: XML 1.0
Databases: MySQL, Sybase
Operating systems: Windows XP/NT
Tools/IDE: Eclipse
Version control: CVS
Team size: 2

Jun 2002 - Dec 2002

7 months

Berlin, Germany

Java Developer

Berliner Wasserbetriebe

Software design and analysis for a utility company with about 1000 employees
Prototype development with SAP integration
Designed and implemented a modular application that connects to the SAP system via BAPI
Performed integration and system tests including documentation
Integrated an external system written in C++ via JNI
Programming language: Java
Tools/IDE: IntelliJ
Framework: JWAM framework
Methodology: Extreme Programming, TDD, Code review, pair programming
Technologies: BAPI, JUnit, JNI
Architecture: Swing
Operating systems: Windows XP/NT
Employer: it-fws
Team size: 7

May 2002 - Jun 2002

2 months

Hamburg, Germany

Java Developer

it-fws

Prototype development and evaluation of MIDP technology on Windows CE for a university hospital
Designed a mobile application on a PDA
Designed a standalone application that receives mobile data via RMI
Programming language: Java
Technologies/architecture: RMI, JWAM, Swing
Operating systems: SavaJe, Windows CE, Windows 2000
Tools/IDE: WebSphere Studio Application Developer, JBuilder

Apr 2002 - Apr 2002

1 month

Berlin, Germany

Java Developer

it-fws

System analysis for a clinic
Designed a driver for data exchange of various lab devices connected in parallel and controlled via a web application
Programming languages: C/C++
Operating system: Linux (Kernel 2.4)
Team size: 2

Jan 2002 - Jan 2002

1 month

Berlin, Germany

Java developer

it-fws

Prototyping of a custom content management system (in-house)
Development of a prototype
Programming language: Java
Architecture: Swing
Technologies: JAXB, XML
Operating system: Windows 2000
Team size: 3

Jul 2001 - Dec 2001

6 months

Berlin, Germany

Java developer

Landesbank Berlin

Development of a web application
Frontend: GUI design and implementation
Introduction of a style guide
Development of a GUI builder framework for web interfaces
Technologies: JSP/Servlet 2.2, Tomcat 3.3, Struts 0.9
Tools/IDE: JBuilder, Visio, Case 4.0
Operating systems: Windows NT, Solaris
Employer: itelligence AG
Team size: 30

Mar 2001 - Apr 2001

2 months

Dortmund, Germany

Java developer

Rewe

Consulting and training for the migration of CSP code from a host architecture to x86 architecture for a wholesale company
Porting program code written in CSP to Java code using Visual Age Generator
Tools/IDE: Visual Age for Java, Visual Age Code Generator
Database: DB2
Operating systems: IBM host, Windows NT/2000
Employer: itelligence AG

Apr 2000 - Oct 2000

7 months

Lucerne, Switzerland

Technical project lead

Dialog AG

Technical project lead for the development of a software module for administrations and municipalities in an international team
Management of offshore development
Introduction of initial object-oriented programming approaches
Introduction of a 3-tier architecture
Programming languages: Visual Basic 5.0, SQL
Tools/IDE: Visual Studio
Database: MS SQL Server
Operating system: Windows NT
Team size: 8

Oct 1999 - Jul 2000

10 months

Lucerne, Switzerland

VBA developer

Dialog AG

Development of a 2-tier module for municipalities and administrative offices
Structured programming on Windows NT
Programming languages: Visual Basic 3.0, SQL
Tools/IDE: Visual Studio
Database: Access 3.0
Operating system: Windows NT
Team size: 8

Apr 1998 - May 1998

2 months

Berlin, Germany

Internet Consultant

IT consulting for an international trading company with about 8 employees
Support for the company's successful launch on the internet

Aug 1997 - Dec 1997

5 months

Berlin, Germany

Software Tester

Kuhnke GmbH

Conducting software quality tests
Software administration
Sales activities for a measurement systems manufacturer with about 12 employees
Team size: 4

Mar 1997 - Sep 1998

1 year 7 months

Berlin, Germany

IT Consultant

Kupon GmbH

IT consulting for a transit trading company
MS Office coaching

Skills

Operating Systems: Windows Nt, Xp, 2000, Linux, Freebsd, Ms-dos, Windows Ce, Savaje, Solaris, Windows Server 2003/2008, Flash-linux
Programming Languages: C, C++, Java, Visual Basic, Sql, Perl, Stored Procedures, Erlang
Scripting Languages: Html, Xml, Xsl, Shell Scripts, Javascript, Jscript, Actionscript, Flex
Databases: Oracle, Ms Sql Server, Access, Postgresql, Db2, Mysql
Data Communication: Tcp/ip, Http/s, Ftp, Rtsp, Rmtp, Smtp, Iso/osi, Ethernet, Wlan, Lan, Gsm, Gprs/edge/umts, Intranet, Internet, Soap, Websocket
Industries: Healthcare, Banking, Public Institutions & Municipalities, Retail, It, Utilities, Telecommunications, Automotive, Human Resources, Transportation, Mechanical Engineering
Technologies: Jdbc, Odbc, Com, Com+, Jdo, Rmi, Jni, Ajax, Jpa, Eclipselink
Architectures: Frameworks, Jwam, Mvc, 3-tier Architecture, Navision, Swing, Apache Tomcat, Jboss, J2ee, J2me, Struts, Junit, Jsp/servlets, Git, Bitbucket, Midp, Blazeds, Spring, Spring Boot, Quarkus, Web Services/rest, Android, Wca, Micro Services
Project Topics: Extreme Programming, Test First, Integration Testing, Data Migration, 3-tier Application, Web Application, Quality Assurance, Technical Documentation, Custom Software Solution, Software Integration, System Analysis, Software Ergonomics, Data Modeling, Software-design & Implementation, Software-engineering, System Takeover, Training, Code-review, Code-analysis, Offshore Development, Requirements Engineering, Cross Site Request Forgery
Ide/tools: Eclipse, Intellij, Visual Age For Java, Netbeans, Jbuilder, Visual Studio, Emacs, Vi, Vim, Sniff++, Visio, Case 4.0, Csv, Wsad, Ant
Other Skills: Uml, Sysml, Ooa, Ood, Design Patterns, Domain-driven Design, Cadastre, Personnel Management, Limit Management, Framework Credit Line Management, Ireb Certified Professional For Requirements Engineering (Cpre)

Languages

German

Native

English

Advanced

French

Elementary

Portuguese

Elementary

Education

Oct 1996 - Jun 1999

IHK Halle

Mathematical-Technical Assistant · Computer Science · Halle (Saale), Germany

Certifications & licenses

IREB Certified Professional for Requirements Engineering (CPRE)

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