Transaction processing
Payments, gift cards, vouchers, loyalty and other real-time transactions: reliable, secure and scalable.
Senior Software Architect · Hands-on developer
Reliable software for complex transactions.
From payment and loyalty to access and membership: CelTom designs and develops systems that have to keep working.
What I help with
From architecture to working software.
You get more than remote advice: an experienced architect who thinks along, builds and takes responsibility for the result.
System integration
APIs, gateways and integrations with terminals, POS systems and external providers.
Modern .NET solutions
C#, .NET 10, Blazor, Razor and SQL Server for maintainable business-critical software.
Proven in practice
The entire chain, from terminal to back office.
Martin Höller has worked on complete real-time platforms: authorisation hosts, gateways, APIs, middleware, databases, web applications, monitoring, reporting and invoicing.
Read Martin's background →Respondit
One modular platform. Room to grow.
From membership administration and events to access control, self-service and online sales.
Discover Respondit