z/OS System Programmer, Security Consultant, Application Developer, RACF specialist
Aktualisiert am 10.12.2025
Profil
Freiberufler / Selbstständiger
Remote-Arbeit
Verfügbar ab: 09.12.2025
Verfügbar zu: 100%
davon vor Ort: 100%
z/OS
RACF
Tivoli zSecure
Assembler
PL/1
Cobol
REXX
C
Storage Administration
DFHSM
zSecure
Carla
Systemprogrammierung
ISPF/PDF
Dialog Tag Language
SIEM
IAM
Linux/390
DB/2
Security Konzepte
Tooling Development
Dutch
English
German
French
not fluently

Einsatzorte

Einsatzorte

Deutschland
möglich

Projekte

Projekte

11 Monate
2025-01 - heute

Implementation of the z/OS systems

Systems Programmer z/OS, Application & Security Consultant
Systems Programmer z/OS, Application & Security Consultant
  • Advise on technical implementation the z/OS Systems and it?s Security Design
  • Security Design Documentation and Implementation of Segregation of Duty and Responsibilities (CZ vs. external party) as the mainframe is outsourced to an external party, this is for done for z/OS, DB/2, CICS, WAS etc.
  • Development of security (RACF, zSecure) tooling and exits (ReXX, Assembler)
  • Teaching CZ colleagues in z/OS System Programming, Security, RACF, zSecure
CZ Health Insurance
6 Monate
2024-07 - 2024-12

Implementation of a new z/OS test system

Systems Programmer z/OS, Application & Security Developer
Systems Programmer z/OS, Application & Security Developer
  • Advise on implementation of a new z/OS Test system including all system rules and modifications on operations, storage management, security, exits, utilities etc.
  • Teaching young colleagues in z/OS System Setup
on request
4 Monate
2024-01 - 2024-04

Design of the security implementation

Security Consultant RACF, zSecure, z/OS, Application Development
Security Consultant RACF, zSecure, z/OS, Application Development
Design of the security implementation in a z/OS HTTP REST Server Program Product. Although the design is initially based on the use of RACF as a security server, other security servers such as CA7 or TopSecret and the like are also supported. The design pays attention to topics such as
  • User authentication
    • ?The authentication of a user is based on the use of RACF Identity Tokens as well as Java WEB Tokens
  • Signing and validation of these tokens is done via encryption/ decryption with (asymmetric) PKCS#11 keys
  • Prevention of ?replay? of token cookies
  • Guidelines and examples for coding in this area for z/OS High Level Assembler
RVS-Systems
Rüsselsheim, Frankfurt Germany
9 Monate
2023-02 - 2023-10

Application Based Security

Security Consultant RACF, zSecure, z/OS z/OS RACF z/Secure RBAC ABAC Security guidelines Administration z/OS
Security Consultant RACF, zSecure, z/OS
Delivering security consultancy that results of a vision document describing
  • Rules and guidelines of the RABOBANK security requirements
  • A new optimized implementation of RACF that is in line with future requirements
  • Definition of needed methods and tooling to automate RACF administration
z/OS RACF z/Secure RBAC ABAC Security guidelines Administration z/OS
RABOBANK, Utrecht
6 Monate
2022-07 - 2022-12

Development of security and storage management applications

Systems Programmer z/OS, Application & Security Developer z/OS RACF ISMF ReXX Assembler
Systems Programmer z/OS, Application & Security Developer
  • Development of security- and storage management applications for use in future security conversions/implementations like Role Based Access Control. This application is programmed in Assembler, ReXX, CARLa, ISPF/PDF Dialog Tag Language using z/OS RACF interface and z/Secure constructs
  • Design and implementation of RACF security concepts/ definitions
z/OS RACF ISMF ReXX Assembler
on request
10 Monate
2021-09 - 2022-06

The bank is transforming the security to support the DevOps way of working

Security Consultant RACF, zSecure, z/OS, Application Based Security
Security Consultant RACF, zSecure, z/OS, Application Based Security
My role in this project is in both the consulting and technical area 

  • I set up the requirements for a ?transformation factory? to automate the transformation process: 
    • definition of Automation Procedures and Proof Of Concepts
  • I developed utilities and tools to 
    • Automate the transformation process 
    • Check that any change will satisfy the newly defined standards 
  • The tooling was written in ReXX, CARLa, ISPF/PDF Dialog Tag Language 

ABNAMRO
Amsterdam
6 Monate
2021-05 - 2021-10

Conversion of CA Easytrieve programs to COBOL equivalents

Systems Programmer z/OS, Application Developer
Systems Programmer z/OS, Application Developer
Sonopar Technische Unie
Amstelveen
1 Jahr
2020-05 - 2021-04

Development of security- and storage management

Systems Programmer z/OS, Application & Security Developer
Systems Programmer z/OS, Application & Security Developer
  • Development of security- and storage management applications for use in future security conversions/implementations like Role Based Access Control. This application is programmed in Assembler, ReXX, CARLa, ISPF/PDF Dialog Tag Language using z/OS RACF interface and z/Secure constructs
  • Design and implementation of RACF security concepts / definitions
on request
1 Jahr
2019-05 - 2020-04

Design, programming, testing and implementation of mainframe legacy software

Application Consultant, Application Programmer (Assembler, PL/1, COBOL)
Application Consultant, Application Programmer (Assembler, PL/1, COBOL)
Design, Programming, Testing and Implementation of mainframe legacy software for use in a non-mainframe MicroFocus PL/1, COBOL environment
  • Converting old Assembler programs to PL/1, COBOL to be used in the (non-mainframe) MicroFocus PL/1, COBOL environment
  • Design, programming and implementation of solutions for IBM PL/1, COBOL functions that are unsupported in the MicroFocus environment
ING Bank
Amsterdam
9 Monate
2018-08 - 2019-04

Development of security- and storage management

Systems Programmer z/OS, Application & Security Developer
Systems Programmer z/OS, Application & Security Developer
  • Development of security- and storage management applications for use in future security conversions/implementations like Role Based Access Control. This application is programmed in Assembler, ReXX, CARLa, ISPF/PDF Dialog Tag Language
  • Design and implementation of RACF security concepts / definitions
on request
1 Jahr 9 Monate
2016-11 - 2018-07

Identity Access Management

Security Consultant RACF, zSecure, z/OS, RBAC, Automatic Provisioning
Security Consultant RACF, zSecure, z/OS, RBAC, Automatic Provisioning
Implementation of Identity Access Management and automatic provisioning of security definitions using Sailpoint IdentityIQ 
  • Delivery of information system security solutions based upon the analysis of user, operational, policy, regulatory and resource demands during delivery of new mainframe user access management
  • Support the development, implementation and operation of security technologies, processes and procedures into the z/OS systems and networks 
  • Provide dedicated Operational delivery in support of Logical Access Management project to deliver security controls in RACF and supported security databases 
  • Provide second-line z/OS Security (RACF and tools) support to Technical Support staff and end users 
  • Conversion of existing non-RBAC security definitions to RBAC based definitions 
  • Design and development of an interface between IdentityIQ (Linux) and z/OS (Enterprise Mainframe) for automatic security provisioning
  • Design and development of applications for automatic provisioning in ReXX and Assembler
Euroclear Bank
Brussels
2 Monate
2016-07 - 2016-08

Design and technical implementation of the entire security environment

Security Consultant RACF, zSecure, z/OS
Security Consultant RACF, zSecure, z/OS
Goal of this project was to split off parts of the RBS bank into a new ?Williams & Glyn? bank
  • In this project I was a Technical Security Consultant and I was responsible for the design and technical implementation of the entire security environment (i.e. both the z/OS system environment and the applications security environment)
  • Unfortunately, due to political reasons (BRexit), the RBS Bank had to cancel this project
IBM UK / Royal Bank of Scotland
Edinburgh
3 Monate
2016-01 - 2016-03

Installation of SuSE Linux for zSystems in a virtual Windows IBM z emulator environment

System Programmer
System Programmer
  • Installation of SuSE Linux for zSystems in a virtual Windows IBM z emulator environment
on Request
2 Jahre 7 Monate
2013-05 - 2015-11

Defined and documented the Security Principles for the entire mainframe security (RACF) environment

Security Consultant RACF, zSecure, z/OS, Information Analyst, Application Developer
Security Consultant RACF, zSecure, z/OS, Information Analyst, Application Developer
  • In this project I defined and documented the Security Principles for the entire mainframe security (RACF) environment. I redesigned and restructured the entire Mainframe RACF Security Environment, based on 
    • functional tasks / responsibilities / ownership 
    • Role Based Access Control
    • segregation of duty 
    • phase out of system wide special attributes (SPECIAL, OPERATIONS) 
    • elimination of high access rights 
  • Implementation of my suggested organizational alterations
  • I designed auditing and reporting procedures for control, usage and protection of control elements, sensitive programs etc. These procedures were built using ReXX and zSecure CARLa
  • I developed system modules to detect and report insecure situations. If desired, the system can automatically take actions due to detected insecure situations
  • I designed and programmed an ISPF/PDF application for automated generation of RACF definitions for new and changed applications, application development environments and workbenches. This system was built using ReXX and Dialog Tag Language 
  • Transfer of knowledge in various areas: Security, RACF, Programming (ReXX, Assembler) etc. 
Belastingdienst Apeldoorn (Government Tax Authorities)
4 Monate
2012-10 - 2013-01

Various projects

  • This period I spent in the United States of America (California)
1 Jahr 1 Monat
2011-09 - 2012-09

Development of various security- and storage management procedures

Systems Programmer z/OS
Systems Programmer z/OS
  • Development of various security- and storage management procedures and programs in JCL, IBM Assembler, ReXX and ISPF/PDF Dialog Tag Language
  • The developed tooling is intended to be used as a base in future security conversions/implementations
on request
6 Monate
2011-01 - 2011-06

As a continuation of the ING RBAC implementation project

Security Consultant, Application Developer, Systems Programmer
Security Consultant, Application Developer, Systems Programmer
  • As a continuation of the ING RBAC implementation project (august ?08 - july ?09), I adapted my tooling to meet changed requirements: 
    • tooling is also to be used in the daily operational work environment 
    • implementation of ?Segregation Of Duty 
  • Furthermore I taught the employees in using the tooling in the daily operational security activities and acted as a coach for day to day security activities. In the second part of this project I acted as a consultant: I advised how to implement Automatic Provisioning under ITIM (IBM Tivoli Identity Manager). Obviously my tooling was to be implemented in the Automatic Provisioning procedures
ATOS Origin / ING Banking Corporation
3 Monate
2010-10 - 2010-12

spent in the United States of America (California)

  • This period I spent in the United States of America (California).
1 Monat
2010-08 - 2010-08

designed and developed programs to convert DB/2 unloads to the ORACLE format

Application Developer, Systems Programmer
Application Developer, Systems Programmer
  • These converted DB/2 unloads were to be loaded directly into ORACLE data bases. It was necessary to implement UTF8 data conversion in these programs
  • These programs have been written in IBM Assembler
Getronics Apeldoorn
8 Monate
2009-11 - 2010-06

Installation, implementation and customization of z/OS systems

Systems Programmer z/OS
Systems Programmer z/OS
  • Installation, implementation and customization of z/OS systems that are to be used for test- and educational purposes
  • These Implementations include implementation of subsystems, network-, security- (RACF) and storage management- (DFSMS, DFHSM) definitions/policies
  • Design and development of various system-exits, system-procedures and systemprograms in JCL, REXX and IBM Assembler in order to have the system automatically respond to various incidents 
on Request
3 Monate
2009-08 - 2009-10

spent in the United States of America (California).

  • This period I spent in the United States of America (California).
1 Jahr
2008-08 - 2009-07

Consultancy in the area of work- and conversion-methods

Security Consultant, Application Developer, Systems Programmer
Security Consultant, Application Developer, Systems Programmer
  • Consultancy in the area of work- and conversion-methods for implementation of an RBAC (Role Based Access Control) based security implementation at the ING Banking Group. As a result I designed developed and implemented working-methods together with the needed programs and exits to automatically convert to the desired security implementation. This implementation included over 45.000 users on 20 z/OS systems. Some systems were based on TSS TopSecret or ACF2 for security management. Using my methods and tooling implied a huge increase in quantity as well as (even more important) quality resulting in a huge money-saver
  • The programs have been written in REXX, Dialog Tag Language and Microsoft (Excel) Visual Basic. The design and implementation of the security definitions were based on RACF (zSecure, CARLa).
ING Banking Corporation Amsterdam

Aus- und Weiterbildung

Aus- und Weiterbildung

General:
  • VWO, Atheneum B
  • MO Mathematics A (Vrije Universiteit, Amsterdam University)
  • MO Mathematics B (Vrije Universiteit, Amsterdam University)


IT Trainings:
  • Various IT oriented courses

Position

Position

  • Systems Architect
  • Senior Consulting IT and Security Specialist
  • Information Analyst
  • z/OS System Programmer
  • z/OS Application Developer
  • Consultant
  • Security administrator
  • Storage administrator
  • Application Designer, Programmer
  • Application Manager
  • Teacher
  • Author

Kompetenzen

Kompetenzen

Top-Skills

z/OS RACF Tivoli zSecure Assembler PL/1 Cobol REXX C Storage Administration DFHSM zSecure Carla Systemprogrammierung ISPF/PDF Dialog Tag Language SIEM IAM Linux/390 DB/2 Security Konzepte Tooling Development

Produkte / Standards / Erfahrungen / Methoden

Points of interest

  • z/OS System Programming and Maintenance (SMP/E)
  • Consultancy, design, conversion and maintenance of Security environments 
  • Security information and event management (SIEM)
  • Consultancy, design, conversion and maintenance of Storage Management environments 
  • Implementation of (Disaster) Recovery procedures
  • Design and development of tools/exits for z/OS, RACF, JES2, TSO, ISPF/PDF in Assembler, ReXX, PL/X language, C language 
  • Application Programming in Assembler, PL/X, PL/1, COBOL, ReXX, ISPF/PDF Dialog Tag Language, C language
  • Implementation of Mainframe Environments on Intel platforms: both on OS/2, Windows and Linux. 


Skills

  • z/OS Systems Programming (Assembler, PL/S, PL/X, ReXX, C) 
  • Mainframe security (RACF, zSecure, CARLa, TSS TopSecret), ACF2 
  • RBAC, SIEM, IAG, Sailpoint IdentityIQ 
  • Mainframe Storage Management (DFSMS, DFHSM, Data Facility products and utilities) 
  • System Software Maintenance and Migration (SMP/E) 
  • Application Development and Programming (PL/1, COBOL, ReXX, CLIST language, ISPF/PDF Dialog Manager and Dialog Tag Language, C language) 
  • SQL, DB/2, DCL, DDL, DML, CICS
  • Application Management 
  • Mainframe documentation languages: SCRIPT/VS, DCF, BookMaster 
  • Microsoft Office Word Excel Outlook Powerpoint Visio

Personality

  • A creative and very analytical IT-specialist and a good team player. Is focused on delivering robust and flexible solutions especially regarding to future development and extensions
  • Likes to share his knowledge and experience, eager to learn, very driven and no nine to five mentality
  • As from 2006 I have travelled a lot through Asia, Africa, SouthAmerica, Iceland and the United States of America. 


General

  • I am very experienced on a wide area in IT: from Consultant and Systems Architect to z/OS Systems and Application Programming and Author of IBM Redbooks like ?Using the IBM S/390 Application StarterPak?
  • I gained this experience during my 31-year employment at IBM Netherlands (1974 ? 2005). I started as an application programmer (in the 70?s), switched to MVS systems programmer for the internal systems (in the 80?s), worked in the 90?s as Consulting IT Specialist working on customer projects and as from the year 2000 I worked both as teacher (IBM Learning Services) and Consulting IT Specialist for IBM Global Services
  • During my entire career I wanted to keep my focus on both the areas of application development and systems programming: I wanted to keep my experience up-to-date in a wide area
  • I was a member of the IBM Works Counsel from 1997 to 2004. This made it possible for me to develop my skills in the area of operational management and negotiation as well
  • After I left IBM I started my own one-man business and worked on various projects in the areas of consultancy, z/OS systems programming, application programming, systems management, security management, storage management etc. 


Middleware/ Software/ Tools

SMP/E, JES2, RACF, zSecure, TSS TopSecret, TSO, ISPF/PDF, Storage Management DF/HSM DF/SMS, DF/DSS, DFP utilities, IODF, ISPF/PDF Dialog Services, OPC, Tivoli Workload Scheduler (TWS), SailPoint IdentityIQ 


Area

  • z/OS System Programming
  • Security (RACF, zSecure, ACF2)
  • SIEM, IAM
  • Storage Management (DFSMS, DFHSM etc.)
  • System & Application Development
  • Languages: IBM Assembler, PL/1, PL/I, PL/X, COBOL, ReXX, CLIST language, zSecure CARLa, ISPF/PDF Dialog TagLanguage, C language, JCL
  • Implementation of Enterprise Systems (z/OS, VM) on Intel PC platforms.
  • Mainframe documentation languages: SCRIPT/VS, DCF, BookMaster
  • Microsoft Office WORD EXCEL OUTLOOK POWERPOINT VISIO


Project Management, Software Development, Methodology

  • LEAN 
  • Scrum, Agile, SAFe 
  • RAD (Rapid Application Development) 
  • Prince2

Betriebssysteme

z/OS
zLinux
zOS
Linux
OS/2
Windows

Programmiersprachen

IBM Assembler
PL/1
PL/I
PL/X
COBOL
ReXX
CLIST language
zSecure CARLa
ISPF/PDF Dialog Tag Language
C language
JCL

Datenbanken

SQL
DB/2
CICS

Hardware

z/Series
Power PC
Intel PC
  

Branchen

Branchen

  • IT-companies
  • Banking and Insurance companies
  • Tele-Communication companies
  • Government

Einsatzorte

Einsatzorte

Deutschland
möglich

Projekte

Projekte

11 Monate
2025-01 - heute

Implementation of the z/OS systems

Systems Programmer z/OS, Application & Security Consultant
Systems Programmer z/OS, Application & Security Consultant
  • Advise on technical implementation the z/OS Systems and it?s Security Design
  • Security Design Documentation and Implementation of Segregation of Duty and Responsibilities (CZ vs. external party) as the mainframe is outsourced to an external party, this is for done for z/OS, DB/2, CICS, WAS etc.
  • Development of security (RACF, zSecure) tooling and exits (ReXX, Assembler)
  • Teaching CZ colleagues in z/OS System Programming, Security, RACF, zSecure
CZ Health Insurance
6 Monate
2024-07 - 2024-12

Implementation of a new z/OS test system

Systems Programmer z/OS, Application & Security Developer
Systems Programmer z/OS, Application & Security Developer
  • Advise on implementation of a new z/OS Test system including all system rules and modifications on operations, storage management, security, exits, utilities etc.
  • Teaching young colleagues in z/OS System Setup
on request
4 Monate
2024-01 - 2024-04

Design of the security implementation

Security Consultant RACF, zSecure, z/OS, Application Development
Security Consultant RACF, zSecure, z/OS, Application Development
Design of the security implementation in a z/OS HTTP REST Server Program Product. Although the design is initially based on the use of RACF as a security server, other security servers such as CA7 or TopSecret and the like are also supported. The design pays attention to topics such as
  • User authentication
    • ?The authentication of a user is based on the use of RACF Identity Tokens as well as Java WEB Tokens
  • Signing and validation of these tokens is done via encryption/ decryption with (asymmetric) PKCS#11 keys
  • Prevention of ?replay? of token cookies
  • Guidelines and examples for coding in this area for z/OS High Level Assembler
RVS-Systems
Rüsselsheim, Frankfurt Germany
9 Monate
2023-02 - 2023-10

Application Based Security

Security Consultant RACF, zSecure, z/OS z/OS RACF z/Secure RBAC ABAC Security guidelines Administration z/OS
Security Consultant RACF, zSecure, z/OS
Delivering security consultancy that results of a vision document describing
  • Rules and guidelines of the RABOBANK security requirements
  • A new optimized implementation of RACF that is in line with future requirements
  • Definition of needed methods and tooling to automate RACF administration
z/OS RACF z/Secure RBAC ABAC Security guidelines Administration z/OS
RABOBANK, Utrecht
6 Monate
2022-07 - 2022-12

Development of security and storage management applications

Systems Programmer z/OS, Application & Security Developer z/OS RACF ISMF ReXX Assembler
Systems Programmer z/OS, Application & Security Developer
  • Development of security- and storage management applications for use in future security conversions/implementations like Role Based Access Control. This application is programmed in Assembler, ReXX, CARLa, ISPF/PDF Dialog Tag Language using z/OS RACF interface and z/Secure constructs
  • Design and implementation of RACF security concepts/ definitions
z/OS RACF ISMF ReXX Assembler
on request
10 Monate
2021-09 - 2022-06

The bank is transforming the security to support the DevOps way of working

Security Consultant RACF, zSecure, z/OS, Application Based Security
Security Consultant RACF, zSecure, z/OS, Application Based Security
My role in this project is in both the consulting and technical area 

  • I set up the requirements for a ?transformation factory? to automate the transformation process: 
    • definition of Automation Procedures and Proof Of Concepts
  • I developed utilities and tools to 
    • Automate the transformation process 
    • Check that any change will satisfy the newly defined standards 
  • The tooling was written in ReXX, CARLa, ISPF/PDF Dialog Tag Language 

ABNAMRO
Amsterdam
6 Monate
2021-05 - 2021-10

Conversion of CA Easytrieve programs to COBOL equivalents

Systems Programmer z/OS, Application Developer
Systems Programmer z/OS, Application Developer
Sonopar Technische Unie
Amstelveen
1 Jahr
2020-05 - 2021-04

Development of security- and storage management

Systems Programmer z/OS, Application & Security Developer
Systems Programmer z/OS, Application & Security Developer
  • Development of security- and storage management applications for use in future security conversions/implementations like Role Based Access Control. This application is programmed in Assembler, ReXX, CARLa, ISPF/PDF Dialog Tag Language using z/OS RACF interface and z/Secure constructs
  • Design and implementation of RACF security concepts / definitions
on request
1 Jahr
2019-05 - 2020-04

Design, programming, testing and implementation of mainframe legacy software

Application Consultant, Application Programmer (Assembler, PL/1, COBOL)
Application Consultant, Application Programmer (Assembler, PL/1, COBOL)
Design, Programming, Testing and Implementation of mainframe legacy software for use in a non-mainframe MicroFocus PL/1, COBOL environment
  • Converting old Assembler programs to PL/1, COBOL to be used in the (non-mainframe) MicroFocus PL/1, COBOL environment
  • Design, programming and implementation of solutions for IBM PL/1, COBOL functions that are unsupported in the MicroFocus environment
ING Bank
Amsterdam
9 Monate
2018-08 - 2019-04

Development of security- and storage management

Systems Programmer z/OS, Application & Security Developer
Systems Programmer z/OS, Application & Security Developer
  • Development of security- and storage management applications for use in future security conversions/implementations like Role Based Access Control. This application is programmed in Assembler, ReXX, CARLa, ISPF/PDF Dialog Tag Language
  • Design and implementation of RACF security concepts / definitions
on request
1 Jahr 9 Monate
2016-11 - 2018-07

Identity Access Management

Security Consultant RACF, zSecure, z/OS, RBAC, Automatic Provisioning
Security Consultant RACF, zSecure, z/OS, RBAC, Automatic Provisioning
Implementation of Identity Access Management and automatic provisioning of security definitions using Sailpoint IdentityIQ 
  • Delivery of information system security solutions based upon the analysis of user, operational, policy, regulatory and resource demands during delivery of new mainframe user access management
  • Support the development, implementation and operation of security technologies, processes and procedures into the z/OS systems and networks 
  • Provide dedicated Operational delivery in support of Logical Access Management project to deliver security controls in RACF and supported security databases 
  • Provide second-line z/OS Security (RACF and tools) support to Technical Support staff and end users 
  • Conversion of existing non-RBAC security definitions to RBAC based definitions 
  • Design and development of an interface between IdentityIQ (Linux) and z/OS (Enterprise Mainframe) for automatic security provisioning
  • Design and development of applications for automatic provisioning in ReXX and Assembler
Euroclear Bank
Brussels
2 Monate
2016-07 - 2016-08

Design and technical implementation of the entire security environment

Security Consultant RACF, zSecure, z/OS
Security Consultant RACF, zSecure, z/OS
Goal of this project was to split off parts of the RBS bank into a new ?Williams & Glyn? bank
  • In this project I was a Technical Security Consultant and I was responsible for the design and technical implementation of the entire security environment (i.e. both the z/OS system environment and the applications security environment)
  • Unfortunately, due to political reasons (BRexit), the RBS Bank had to cancel this project
IBM UK / Royal Bank of Scotland
Edinburgh
3 Monate
2016-01 - 2016-03

Installation of SuSE Linux for zSystems in a virtual Windows IBM z emulator environment

System Programmer
System Programmer
  • Installation of SuSE Linux for zSystems in a virtual Windows IBM z emulator environment
on Request
2 Jahre 7 Monate
2013-05 - 2015-11

Defined and documented the Security Principles for the entire mainframe security (RACF) environment

Security Consultant RACF, zSecure, z/OS, Information Analyst, Application Developer
Security Consultant RACF, zSecure, z/OS, Information Analyst, Application Developer
  • In this project I defined and documented the Security Principles for the entire mainframe security (RACF) environment. I redesigned and restructured the entire Mainframe RACF Security Environment, based on 
    • functional tasks / responsibilities / ownership 
    • Role Based Access Control
    • segregation of duty 
    • phase out of system wide special attributes (SPECIAL, OPERATIONS) 
    • elimination of high access rights 
  • Implementation of my suggested organizational alterations
  • I designed auditing and reporting procedures for control, usage and protection of control elements, sensitive programs etc. These procedures were built using ReXX and zSecure CARLa
  • I developed system modules to detect and report insecure situations. If desired, the system can automatically take actions due to detected insecure situations
  • I designed and programmed an ISPF/PDF application for automated generation of RACF definitions for new and changed applications, application development environments and workbenches. This system was built using ReXX and Dialog Tag Language 
  • Transfer of knowledge in various areas: Security, RACF, Programming (ReXX, Assembler) etc. 
Belastingdienst Apeldoorn (Government Tax Authorities)
4 Monate
2012-10 - 2013-01

Various projects

  • This period I spent in the United States of America (California)
1 Jahr 1 Monat
2011-09 - 2012-09

Development of various security- and storage management procedures

Systems Programmer z/OS
Systems Programmer z/OS
  • Development of various security- and storage management procedures and programs in JCL, IBM Assembler, ReXX and ISPF/PDF Dialog Tag Language
  • The developed tooling is intended to be used as a base in future security conversions/implementations
on request
6 Monate
2011-01 - 2011-06

As a continuation of the ING RBAC implementation project

Security Consultant, Application Developer, Systems Programmer
Security Consultant, Application Developer, Systems Programmer
  • As a continuation of the ING RBAC implementation project (august ?08 - july ?09), I adapted my tooling to meet changed requirements: 
    • tooling is also to be used in the daily operational work environment 
    • implementation of ?Segregation Of Duty 
  • Furthermore I taught the employees in using the tooling in the daily operational security activities and acted as a coach for day to day security activities. In the second part of this project I acted as a consultant: I advised how to implement Automatic Provisioning under ITIM (IBM Tivoli Identity Manager). Obviously my tooling was to be implemented in the Automatic Provisioning procedures
ATOS Origin / ING Banking Corporation
3 Monate
2010-10 - 2010-12

spent in the United States of America (California)

  • This period I spent in the United States of America (California).
1 Monat
2010-08 - 2010-08

designed and developed programs to convert DB/2 unloads to the ORACLE format

Application Developer, Systems Programmer
Application Developer, Systems Programmer
  • These converted DB/2 unloads were to be loaded directly into ORACLE data bases. It was necessary to implement UTF8 data conversion in these programs
  • These programs have been written in IBM Assembler
Getronics Apeldoorn
8 Monate
2009-11 - 2010-06

Installation, implementation and customization of z/OS systems

Systems Programmer z/OS
Systems Programmer z/OS
  • Installation, implementation and customization of z/OS systems that are to be used for test- and educational purposes
  • These Implementations include implementation of subsystems, network-, security- (RACF) and storage management- (DFSMS, DFHSM) definitions/policies
  • Design and development of various system-exits, system-procedures and systemprograms in JCL, REXX and IBM Assembler in order to have the system automatically respond to various incidents 
on Request
3 Monate
2009-08 - 2009-10

spent in the United States of America (California).

  • This period I spent in the United States of America (California).
1 Jahr
2008-08 - 2009-07

Consultancy in the area of work- and conversion-methods

Security Consultant, Application Developer, Systems Programmer
Security Consultant, Application Developer, Systems Programmer
  • Consultancy in the area of work- and conversion-methods for implementation of an RBAC (Role Based Access Control) based security implementation at the ING Banking Group. As a result I designed developed and implemented working-methods together with the needed programs and exits to automatically convert to the desired security implementation. This implementation included over 45.000 users on 20 z/OS systems. Some systems were based on TSS TopSecret or ACF2 for security management. Using my methods and tooling implied a huge increase in quantity as well as (even more important) quality resulting in a huge money-saver
  • The programs have been written in REXX, Dialog Tag Language and Microsoft (Excel) Visual Basic. The design and implementation of the security definitions were based on RACF (zSecure, CARLa).
ING Banking Corporation Amsterdam

Aus- und Weiterbildung

Aus- und Weiterbildung

General:
  • VWO, Atheneum B
  • MO Mathematics A (Vrije Universiteit, Amsterdam University)
  • MO Mathematics B (Vrije Universiteit, Amsterdam University)


IT Trainings:
  • Various IT oriented courses

Position

Position

  • Systems Architect
  • Senior Consulting IT and Security Specialist
  • Information Analyst
  • z/OS System Programmer
  • z/OS Application Developer
  • Consultant
  • Security administrator
  • Storage administrator
  • Application Designer, Programmer
  • Application Manager
  • Teacher
  • Author

Kompetenzen

Kompetenzen

Top-Skills

z/OS RACF Tivoli zSecure Assembler PL/1 Cobol REXX C Storage Administration DFHSM zSecure Carla Systemprogrammierung ISPF/PDF Dialog Tag Language SIEM IAM Linux/390 DB/2 Security Konzepte Tooling Development

Produkte / Standards / Erfahrungen / Methoden

Points of interest

  • z/OS System Programming and Maintenance (SMP/E)
  • Consultancy, design, conversion and maintenance of Security environments 
  • Security information and event management (SIEM)
  • Consultancy, design, conversion and maintenance of Storage Management environments 
  • Implementation of (Disaster) Recovery procedures
  • Design and development of tools/exits for z/OS, RACF, JES2, TSO, ISPF/PDF in Assembler, ReXX, PL/X language, C language 
  • Application Programming in Assembler, PL/X, PL/1, COBOL, ReXX, ISPF/PDF Dialog Tag Language, C language
  • Implementation of Mainframe Environments on Intel platforms: both on OS/2, Windows and Linux. 


Skills

  • z/OS Systems Programming (Assembler, PL/S, PL/X, ReXX, C) 
  • Mainframe security (RACF, zSecure, CARLa, TSS TopSecret), ACF2 
  • RBAC, SIEM, IAG, Sailpoint IdentityIQ 
  • Mainframe Storage Management (DFSMS, DFHSM, Data Facility products and utilities) 
  • System Software Maintenance and Migration (SMP/E) 
  • Application Development and Programming (PL/1, COBOL, ReXX, CLIST language, ISPF/PDF Dialog Manager and Dialog Tag Language, C language) 
  • SQL, DB/2, DCL, DDL, DML, CICS
  • Application Management 
  • Mainframe documentation languages: SCRIPT/VS, DCF, BookMaster 
  • Microsoft Office Word Excel Outlook Powerpoint Visio

Personality

  • A creative and very analytical IT-specialist and a good team player. Is focused on delivering robust and flexible solutions especially regarding to future development and extensions
  • Likes to share his knowledge and experience, eager to learn, very driven and no nine to five mentality
  • As from 2006 I have travelled a lot through Asia, Africa, SouthAmerica, Iceland and the United States of America. 


General

  • I am very experienced on a wide area in IT: from Consultant and Systems Architect to z/OS Systems and Application Programming and Author of IBM Redbooks like ?Using the IBM S/390 Application StarterPak?
  • I gained this experience during my 31-year employment at IBM Netherlands (1974 ? 2005). I started as an application programmer (in the 70?s), switched to MVS systems programmer for the internal systems (in the 80?s), worked in the 90?s as Consulting IT Specialist working on customer projects and as from the year 2000 I worked both as teacher (IBM Learning Services) and Consulting IT Specialist for IBM Global Services
  • During my entire career I wanted to keep my focus on both the areas of application development and systems programming: I wanted to keep my experience up-to-date in a wide area
  • I was a member of the IBM Works Counsel from 1997 to 2004. This made it possible for me to develop my skills in the area of operational management and negotiation as well
  • After I left IBM I started my own one-man business and worked on various projects in the areas of consultancy, z/OS systems programming, application programming, systems management, security management, storage management etc. 


Middleware/ Software/ Tools

SMP/E, JES2, RACF, zSecure, TSS TopSecret, TSO, ISPF/PDF, Storage Management DF/HSM DF/SMS, DF/DSS, DFP utilities, IODF, ISPF/PDF Dialog Services, OPC, Tivoli Workload Scheduler (TWS), SailPoint IdentityIQ 


Area

  • z/OS System Programming
  • Security (RACF, zSecure, ACF2)
  • SIEM, IAM
  • Storage Management (DFSMS, DFHSM etc.)
  • System & Application Development
  • Languages: IBM Assembler, PL/1, PL/I, PL/X, COBOL, ReXX, CLIST language, zSecure CARLa, ISPF/PDF Dialog TagLanguage, C language, JCL
  • Implementation of Enterprise Systems (z/OS, VM) on Intel PC platforms.
  • Mainframe documentation languages: SCRIPT/VS, DCF, BookMaster
  • Microsoft Office WORD EXCEL OUTLOOK POWERPOINT VISIO


Project Management, Software Development, Methodology

  • LEAN 
  • Scrum, Agile, SAFe 
  • RAD (Rapid Application Development) 
  • Prince2

Betriebssysteme

z/OS
zLinux
zOS
Linux
OS/2
Windows

Programmiersprachen

IBM Assembler
PL/1
PL/I
PL/X
COBOL
ReXX
CLIST language
zSecure CARLa
ISPF/PDF Dialog Tag Language
C language
JCL

Datenbanken

SQL
DB/2
CICS

Hardware

z/Series
Power PC
Intel PC
  

Branchen

Branchen

  • IT-companies
  • Banking and Insurance companies
  • Tele-Communication companies
  • Government

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