11/08/2025 updated

**** ******** ****
40 % partially available

Senior Software Architect, Senior Software Engineer, .NET Developer

Apeldoorn, Netherlands Courseware development, Pedagogische Academie
Apeldoorn, Netherlands Courseware development, Pedagogische Academie

Profile attachments

CV Martin Holler NL 2025-02.pdf
CV Martin Holler DE 2025-02.pdf
CV Martin Holler EN 2025-02.pdf
PO Martin Holler DE 2025-02.pdf
PO Martin Holler NL 2025-02.pdf
PO Martin Holler EN 2025-02.pdf

Web InterfacesASP.NETC (Programming Language)JavaScript.NET FrameworkApplication Programming Interfaces (APIs)Application SecurityHTML5C Sharp (Programming Language)C++ (Programming Language)Communications ProtocolsDatabasesFile SystemsElectronic Data Interchange (EDI)MiddlewareEmbedded SoftwareFoxProInternet Information Services (IIS)Web PortalsJSONMicrosoft Windows SDKMicrosoft SQL ServersRadio-Frequency IdentificationPayment GatewaySoftware ArchitectureSecurity SoftwareSimple Object Access Protocol (SOAP)Tcl (Programming Language)Transact-SQLVirtual TerminalWeb ApplicationsWeb ServicesExtensible Markup Language (XML)Transaction Processing (Computing)DevexpressBackendVerifoneApi GatewayRestful Api
.NET, Ansi-C, ASP.NET, API, APIs, Backend, C#, C# .NET, C / C++, communication protocols, databases, DevExpress, Embedded software, interfaces, gateways, EDI, XML, file processing, EMV, NFC, Foxpro, HTML5, IIS, JSON, JavaScript, Jira, Git, SQL-Server, MS-SQL, Windows, Microsoft platform, middleware, system monitoring, security software, REST, SOAP, software architecture, TCL, Transact-SQL, T-SQL, transaction processing, Verifone, virtual terminal, web Apps, web applications, web portals, Web services, RFID, NFC

Languages

GermanGoodEnglishGoodDutchNative speaker

Project history

Senior Software Engineer (Freelance)

CelTom Software

Internet & IT

< 10 team member

Software Architect

ICP Companies BV
* Creation of a generic communication and switching platform for
o Terminals
o Cash-registers
o Web-shops
o Portals
o Hosts (Host-to-Host)
o Mobiles and tablets
* Creation of the transactions processing system (Mimas) for
o Giftcards (Closed Loop and Third Party POSA products)
o Loyalty-, Discount- and Employee- cards
o TopUp, Vouchers, Direct, Credit, Internet Vouchers (POD and POR)
o Ticketing and coupons
o In-lane Lottery and game cards
o SIM card activation (EID validation, OCSP responder)
o Payment (cards, contactless and mobile) and PSP
o Promo's and virtual cards (QR)
o Digital (cash-register) tickets
* Setup architecture and databases for the Mimas system
* Development of maintenance web-portal
* Development of virtual web-terminal
* Development of PIN-Server system
* Development of fleet card authorization system
* Create technical documentation and manuals
* Development of invoicing system (EDI, DES-ADV)

* Development of terminal plug-in components for cash-registers
* Development of reporting system
* Train developers
* Development of system monitoring system
* Development of CTAP embedded terminal and host functions

Senior Software Engineer

Intersolve Hoevelaken
* Maintenance of existing loyalty, giftcard, coupon, voucher terminal
* Development of card generation application
* Development of file processing (import/export) application
* Development of service adaptors for online switching platform
* Functional design and manuals for loyalty and giftcard system
* Create migration plan for large loyalty system (Caribbean Islands)
* Development of mailing service adaptor
* Development of online OV-chip card (railway) switching system
* Internal and acceptance testing of terminal and web applications
* Maintenance of existing COM layer

Software Architect

ICP Companies
* Development of terminal plug-in components for cash-registers
* Development of TMS (Terminal Management Systeem)
* Development of generic online loyalty, prepaid and giftcard system
* Development of authorization and communication systems
* Development of applications for transaction processing
* Development of (chipcard) terminal applications
* Development of test and system monitoring tools
* Development of top-up system for mobile phones
* Development of simulators and virtual terminals
* Development of web portal for retailers
* Create technical documentation for communication protocols
* Supervising certification of CTAP terminals (Equens, Currence)
* Development of PIN algorithms
* Development of terminal initialization/personalization systems

Software Engineer, Software Manager

Smart Concepts
* Planning and project management of development department
* Quality monitoring and employee assessments
* Development of several terminal and backend host applications
* Development of loyalty systems for the Dutch and German market
* Migration and conversion of petrol systems to new generic platform
* Train developers
* Development of debit- and credit- card terminal applications
* Development of card personalization and embossing system




* Development of generic application and middleware framework
* Development of SDK for embedded terminals
* Development of front end processors
* Development of real-time transaction processing systems

Software engineer

CCV
* Development of security software for payment Pinpads
* Development of terminal applications for petrol and loyalty
* Development of functions for debet- and credit- cards
* Development of Chipknip en Chipper terminal
* Development of pin calculation and pinmailer system
* Development of initialization and key loading systems
* Development of front end communication systems
* Development of simulators and tools
* Development of generic libraries and middleware
* Development of financial and administration backend applications

Substitute Z.M.O.K. school teacher

Jongenshuis Hoenderloo (Hoenderloo groep)

Substitute primary school teacher

Municipality of Apeldoorn

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