We build and connect interfaces between your existing systems: ERP, CRM, shop, legacy, and SaaS tools - via REST, GraphQL, gRPC, webhooks, message brokers, and change data capture. Secure, documented, and operated on European infrastructure.
Leading companies worldwide trust WZ-IT
In most companies the actual software already exists: ERP, CRM, shop, accounting, industry solutions. What is missing are reliable interfaces between them. Manual transfer, nightly CSV exports, and brittle point-to-point scripts cost time and create exactly the inconsistencies that get expensive later.
We build the integration layer: APIs, connectors, webhooks, and middleware that connect your systems cleanly and traceably. The result is a data flow you can understand, monitor, and extend - without dependence on an opaque iPaaS black box.
A whole application instead of just an interface? Custom Business Apps - that is where we build the complete application, not just the connection in between.
From a single API to event-driven middleware - we choose the right architecture per use case instead of solving every problem with the same pattern.
Clean, versioned interfaces built on REST, GraphQL, or gRPC - documented with OpenAPI, with explicit contracts between systems. We design the API along your domain, not as a mirror of a database table.
Connectivity to SAP, Microsoft Dynamics, Odoo, Salesforce, and other business systems. We know the typical pitfalls - tenants, document flows, master data - and address each native API cleanly instead of building fragile direct database access.
SOAP-to-REST wrappers, EDI formats (EDIFACT, X12), CSV, XML, and fixed-width files over SFTP or file share. We wrap legacy systems behind modern, well-testable interfaces without touching the legacy system itself.
Instead of polling systems every minute, they react to events: a new order, a status change, a payment immediately triggers the right follow-up step. With retry logic, idempotency, and dead-letter handling so no event gets lost.
A decoupling layer between your systems with Apache Kafka, RabbitMQ, or MQTT. Producers and consumers do not need to know each other, load spikes are buffered, and new consumers are added without rebuilding what already exists.
Keep systems consistent - via scheduled synchronization or change data capture that propagates changes in near real time. We define the system of record, resolve conflicts deterministically, and make the data flow traceable.
Anywhere two or more systems need to work together reliably, a cleanly built interface pays off over a workaround.
Articles, prices, stock levels, and orders flow automatically between ERP and online shop or customer portal. Orders land in the ERP without a media break, status changes flow back to the customer - without manual re-keying.
You want to give partners, integrators, or your own apps controlled access. We build a documented, secured API with authentication, rate limiting, and versioning - including a developer portal and OpenAPI specification.
An aging SOAP service needs to be consumed by modern applications. We put a REST or webhook facade in front, translate formats and error codes, and decouple new systems from the old protocol.
CRM, accounting, ticketing, and communication tools need to work together. For standardizable flows we use self-hosted n8n, for business-critical integrations we use custom code - or a combination of both.
Integration is often just one building block. When the task is bigger, we cover the rest with adjacent services.
When it is not just the connection that is missing but a complete application is needed - dashboards, portals, line-of-business systems - we build it from the ground up.
To application developmentWhen it is about large data volumes, pipelines, CDC, and analytics, the data platform is the right place - integration and data synchronization mesh here.
To data platformsWe map your systems, data objects, and triggers and define the interface contracts - including system of record, error behavior, and security model. Output: an OpenAPI or event specification everyone works against.
Implementation in iterative releases against test and staging systems, with automated tests, idempotency, and replayability. The first production-ready interfaces are typically available within a few weeks.
We operate the integration with monitoring, alerting, and traceable logging - or hand it over to your team with runbooks. Failed messages land in a dead-letter queue and are not lost.
This page covers the layer between existing systems: APIs, connectors, webhooks, middleware, and data synchronization. We do not build a complete application from scratch, we connect what is already there. If you need a whole application - dashboard, portal, or line-of-business system - Custom Business Apps is the right service. Often we combine both: a new application plus integration into your existing systems.
For synchronous APIs we use REST, GraphQL, or gRPC depending on the requirement and document with OpenAPI. For event-driven integration we use webhooks and message brokers such as Apache Kafka, RabbitMQ, or MQTT. For legacy systems we work with SOAP, EDI formats (EDIFACT, X12), and file-based exchange. The choice follows latency, data volume, and your systems interfaces, not fashion.
Yes. We have built connectors to SAP, Microsoft Dynamics, Odoo, Salesforce, and other systems. We use the vendor documented API or official integration layer instead of fragile direct database access. That keeps the connection stable even after updates to the ERP or CRM system.
Authentication via OAuth2 and OpenID Connect, API keys, or mTLS depending on context. On top of that come rate limiting, input validation, scopes for fine-grained permissions, and complete audit logging. For identity and authorization topics we use the same building blocks as on our member and tenant platforms, so auth stays central and traceable.
Every integration gets monitoring, alerting, and traceable logging. Failed messages land in a dead-letter queue and can be replayed in a controlled way instead of silently getting lost. We operate the integration on European infrastructure as a managed service - or hand it over to your team with runbooks.
We start with an analysis of your system landscape and define the interface contracts. On that basis you receive a binding fixed price per integration or a package for several interfaces. We deliver in iterative releases - the first production-ready interfaces are typically available within a few weeks. We agree the concrete scope individually with you.
No risk: worst case, you leave with a clearer understanding of your project than before.
“I got to know Timo and Robin as dedicated and professional partners who make a lot of things possible for their clients that initially seem impossible. I felt very well advised. The services offered have thoroughly convinced me. (translated)”
Andrea Pawlowski
Communications Manager, Golem.de
Golem.de - leading German IT news outlet.
“With Timo and Robin, you're not only on the safe side technically - you also get the best human support! Whether it's quick help in everyday life or complex IT solutions: the guys from WZ-IT think along with you, act quickly and speak a language you understand. The collaboration is uncomplicated, reliable and always on an equal footing. That makes IT fun - and above all: it works! Big thank you to the team! (translated)”
Sonja Aßer
Data Manager, ARGE
ARGE Neue Medien - master data & digital standards for plumbing and building technology.
“I recently worked with Timo and the WZ-IT team, and honestly, it turned out to be one of the best tech decisions I have made for my business. Right from the start, Timo took the time to walk me through every step in a simple and calm way. No matter how many questions I had, he never rushed me. The results speak for themselves. With WZ-IT, we reduced our monthly expenses from $1,300 down to $250. This was a huge win for us.”
Aleksandr Shuliko
CTO, EVA Real Estate, UAE
EVA Real Estate - leading real-estate agency in Dubai.
“WZ-IT manages our Proxmox cluster reliably and professionally. The team handles continuous monitoring and regular updates for us and responds very quickly to any issues or inquiries. They also configure new nodes, systems, and applications that we need to add to our cluster. With WZ-IT's proactive support, our cluster and the business-critical applications running on it remain stable, and high availability is consistently ensured. We value the professional collaboration and the noticeable relief it brings to our daily operations.”
Pascal Hakkers
Managing Director, Aphy B.V., Netherlands
Aphy - AI platform for hotel back-office.
“WZ-IT provided very competent support in implementing our server and virtualization infrastructure. As part of the project, a Proxmox-based virtualization environment was set up along with a virtual machine for our application systems. Additionally, a structured backup concept was implemented. A particular focus was on security: the setup of a VPN tunnel and the clean implementation of encryption and access concepts were professionally executed. The structured consulting as well as the reliable and swift implementation deserve special mention. We are very satisfied with the services provided and are happy to recommend WZ-IT.”
John Hellmerichs
Managing Director, AInergy GmbH
AInergy - consultancy for energy and facility management.
“We have had very good experiences with Mr. Wevelsiep and WZ-IT. The consultation was professional, clearly understandable, and at fair prices. The team not only implemented our requirements but also thought along and proactively. Instead of just processing individual tasks, they provided us with well-founded explanations that strengthened our own understanding. WZ-IT took a lot of pressure off us with their structured approach - that was exactly what we needed and is the reason why we keep coming back. (translated)”
Matthias Zimmermann
Managing Director, Annota GmbH
Annota - healthtech startup with an AI documentation assistant.
“Timo and Robin from WZ-IT set up a RocketChat server for us - and I couldn't be more satisfied! From the initial consultation to the final implementation, everything was absolutely professional, efficient, and to my complete satisfaction. I particularly appreciate the clear communication, transparent pricing, and the comprehensive expertise that both bring to the table. Even after the setup, they take care of the maintenance, which frees up my time enormously and allows me to focus on other important areas of my business - with the good feeling that our IT is in the best hands. I can recommend WZ-IT without reservation and look forward to continuing our collaboration! (translated)”
Sebastian Maier
Managing Director, Yonju GmbH
Yonju - business coaching and AI products.
“Counting on WZ-IT team was crucial, their expertise and solutions gave us the pace to deploy in production our services, even suggesting and performing improvements over our configuration and setup. We expect to keep counting on them for continuous maintenance of our services and implementation of new solutions.”
Gabriel Sanz Señor
Managing Director, Odiseo Solutions
Odiseo Solutions - software engineering for the space industry.
“I got to know Timo and Robin as dedicated and professional partners who make a lot of things possible for their clients that initially seem impossible. I felt very well advised. The services offered have thoroughly convinced me. (translated)”
Andrea Pawlowski
Communications Manager, Golem.de
Golem.de - leading German IT news outlet.
“With Timo and Robin, you're not only on the safe side technically - you also get the best human support! Whether it's quick help in everyday life or complex IT solutions: the guys from WZ-IT think along with you, act quickly and speak a language you understand. The collaboration is uncomplicated, reliable and always on an equal footing. That makes IT fun - and above all: it works! Big thank you to the team! (translated)”
Sonja Aßer
Data Manager, ARGE
ARGE Neue Medien - master data & digital standards for plumbing and building technology.
“I recently worked with Timo and the WZ-IT team, and honestly, it turned out to be one of the best tech decisions I have made for my business. Right from the start, Timo took the time to walk me through every step in a simple and calm way. No matter how many questions I had, he never rushed me. The results speak for themselves. With WZ-IT, we reduced our monthly expenses from $1,300 down to $250. This was a huge win for us.”
Aleksandr Shuliko
CTO, EVA Real Estate, UAE
EVA Real Estate - leading real-estate agency in Dubai.
“WZ-IT manages our Proxmox cluster reliably and professionally. The team handles continuous monitoring and regular updates for us and responds very quickly to any issues or inquiries. They also configure new nodes, systems, and applications that we need to add to our cluster. With WZ-IT's proactive support, our cluster and the business-critical applications running on it remain stable, and high availability is consistently ensured. We value the professional collaboration and the noticeable relief it brings to our daily operations.”
Pascal Hakkers
Managing Director, Aphy B.V., Netherlands
Aphy - AI platform for hotel back-office.
“WZ-IT provided very competent support in implementing our server and virtualization infrastructure. As part of the project, a Proxmox-based virtualization environment was set up along with a virtual machine for our application systems. Additionally, a structured backup concept was implemented. A particular focus was on security: the setup of a VPN tunnel and the clean implementation of encryption and access concepts were professionally executed. The structured consulting as well as the reliable and swift implementation deserve special mention. We are very satisfied with the services provided and are happy to recommend WZ-IT.”
John Hellmerichs
Managing Director, AInergy GmbH
AInergy - consultancy for energy and facility management.
“We have had very good experiences with Mr. Wevelsiep and WZ-IT. The consultation was professional, clearly understandable, and at fair prices. The team not only implemented our requirements but also thought along and proactively. Instead of just processing individual tasks, they provided us with well-founded explanations that strengthened our own understanding. WZ-IT took a lot of pressure off us with their structured approach - that was exactly what we needed and is the reason why we keep coming back. (translated)”
Matthias Zimmermann
Managing Director, Annota GmbH
Annota - healthtech startup with an AI documentation assistant.
“Timo and Robin from WZ-IT set up a RocketChat server for us - and I couldn't be more satisfied! From the initial consultation to the final implementation, everything was absolutely professional, efficient, and to my complete satisfaction. I particularly appreciate the clear communication, transparent pricing, and the comprehensive expertise that both bring to the table. Even after the setup, they take care of the maintenance, which frees up my time enormously and allows me to focus on other important areas of my business - with the good feeling that our IT is in the best hands. I can recommend WZ-IT without reservation and look forward to continuing our collaboration! (translated)”
Sebastian Maier
Managing Director, Yonju GmbH
Yonju - business coaching and AI products.
“Counting on WZ-IT team was crucial, their expertise and solutions gave us the pace to deploy in production our services, even suggesting and performing improvements over our configuration and setup. We expect to keep counting on them for continuous maintenance of our services and implementation of new solutions.”
Gabriel Sanz Señor
Managing Director, Odiseo Solutions
Odiseo Solutions - software engineering for the space industry.
“I got to know Timo and Robin as dedicated and professional partners who make a lot of things possible for their clients that initially seem impossible. I felt very well advised. The services offered have thoroughly convinced me. (translated)”
Andrea Pawlowski
Communications Manager, Golem.de
Golem.de - leading German IT news outlet.
“With Timo and Robin, you're not only on the safe side technically - you also get the best human support! Whether it's quick help in everyday life or complex IT solutions: the guys from WZ-IT think along with you, act quickly and speak a language you understand. The collaboration is uncomplicated, reliable and always on an equal footing. That makes IT fun - and above all: it works! Big thank you to the team! (translated)”
Sonja Aßer
Data Manager, ARGE
ARGE Neue Medien - master data & digital standards for plumbing and building technology.
“I recently worked with Timo and the WZ-IT team, and honestly, it turned out to be one of the best tech decisions I have made for my business. Right from the start, Timo took the time to walk me through every step in a simple and calm way. No matter how many questions I had, he never rushed me. The results speak for themselves. With WZ-IT, we reduced our monthly expenses from $1,300 down to $250. This was a huge win for us.”
Aleksandr Shuliko
CTO, EVA Real Estate, UAE
EVA Real Estate - leading real-estate agency in Dubai.
“WZ-IT manages our Proxmox cluster reliably and professionally. The team handles continuous monitoring and regular updates for us and responds very quickly to any issues or inquiries. They also configure new nodes, systems, and applications that we need to add to our cluster. With WZ-IT's proactive support, our cluster and the business-critical applications running on it remain stable, and high availability is consistently ensured. We value the professional collaboration and the noticeable relief it brings to our daily operations.”
Pascal Hakkers
Managing Director, Aphy B.V., Netherlands
Aphy - AI platform for hotel back-office.
“WZ-IT provided very competent support in implementing our server and virtualization infrastructure. As part of the project, a Proxmox-based virtualization environment was set up along with a virtual machine for our application systems. Additionally, a structured backup concept was implemented. A particular focus was on security: the setup of a VPN tunnel and the clean implementation of encryption and access concepts were professionally executed. The structured consulting as well as the reliable and swift implementation deserve special mention. We are very satisfied with the services provided and are happy to recommend WZ-IT.”
John Hellmerichs
Managing Director, AInergy GmbH
AInergy - consultancy for energy and facility management.
“We have had very good experiences with Mr. Wevelsiep and WZ-IT. The consultation was professional, clearly understandable, and at fair prices. The team not only implemented our requirements but also thought along and proactively. Instead of just processing individual tasks, they provided us with well-founded explanations that strengthened our own understanding. WZ-IT took a lot of pressure off us with their structured approach - that was exactly what we needed and is the reason why we keep coming back. (translated)”
Matthias Zimmermann
Managing Director, Annota GmbH
Annota - healthtech startup with an AI documentation assistant.
“Timo and Robin from WZ-IT set up a RocketChat server for us - and I couldn't be more satisfied! From the initial consultation to the final implementation, everything was absolutely professional, efficient, and to my complete satisfaction. I particularly appreciate the clear communication, transparent pricing, and the comprehensive expertise that both bring to the table. Even after the setup, they take care of the maintenance, which frees up my time enormously and allows me to focus on other important areas of my business - with the good feeling that our IT is in the best hands. I can recommend WZ-IT without reservation and look forward to continuing our collaboration! (translated)”
Sebastian Maier
Managing Director, Yonju GmbH
Yonju - business coaching and AI products.
“Counting on WZ-IT team was crucial, their expertise and solutions gave us the pace to deploy in production our services, even suggesting and performing improvements over our configuration and setup. We expect to keep counting on them for continuous maintenance of our services and implementation of new solutions.”
Gabriel Sanz Señor
Managing Director, Odiseo Solutions
Odiseo Solutions - software engineering for the space industry.
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Whether a specific IT challenge or just an idea - we look forward to the exchange. In a brief conversation, we'll evaluate together if and how your project fits with WZ-IT.
Leading companies trust WZ-IT
Timo Wevelsiep & Robin Zins
Managing Directors of WZ-IT
