WSDL Experts in Cologne
in minutes from over 15,000 CVs with the power of AI.Hire experts who design SOAP service contracts, define operations and message types in WSDL, and keep integration points clear across Java, .NET, and enterprise systems. Get fast, precise matching with vetted, available freelancers.
Meet FRATCH Experts in Cologne, who have recently used WSDL
Hooman B.
Last position:
Fullstack Developer at Möbel Roller GmbH
- Further development of the existing e-commerce platform based on SAP Commerce (Hybris) to meet the growing demands of digital commerce.
- Ensuring the scalability and performance of the backend, so the platform remained stable and efficient even under heavy user load.
- Development and integration of new OCC REST APIs and services for modular extensions and flexible adjustments, to implement new features quickly.
- Optimization of data flows and interfaces, which significantly improved platform efficiency and system performance.
- Ensuring a maintainable and scalable code base by using Clean Code principles, proven design patterns, and a future-proof architecture.
- Reduction of errors through extensive testing with JUnit, Mockito, and load tests with Gatling, supported by the introduction of automated test processes.
- Improved system performance through targeted refactoring measures and efficient database queries, especially to handle peak loads.
- Use of modern cloud and monitoring tools such as Kubernetes, Google Cloud Platform (GCP), and Grafana to ensure a stable and monitored infrastructure.
- Clear improvement in efficiency, scalability, and reliability of the platform, which now meets the demands of a dynamic and growing e-commerce market.
Burhan D.
Last position:
Enterprise Architect & Solution Architect at DB Netz AG
With project PRIZMA, DB will modernize its infrastructure on the one hand, and develop a fail-safe IT landscape on the other hand, which can be restored quickly and securely in case of a disaster.
- Capture current architectures of existing systems as well as methodical consulting and development of target architectures
- Deepen and maintain the building plan / target IT landscape
- Implement technical architecture concepts & architecture descriptions
- Implement migration concepts for updating and further developing the platform and information systems
- Assess submitted improvement suggestions as part of the project
- Capability management: identify capability gaps, develop target visions, and support transformation planning within the enterprise architecture.
- Create a compatibility matrix of the components in use and compare dependencies of specific versions
- Create an IT concept for extending the platform with the following topics: hardware and software requirements, security, licensing, high availability, load balancing, backup & recovery, update strategy, monitoring integration, etc.
- Coordinate with business architects as well as technical architects from the cross-functional architecture area of the PRISMA program for the topics (backup, Active Directory, monitoring, Citrix, and business applications ...)
- Status meetings and alignment of project planning with the Release Train Engineer / Project Manager
- Advise the Release Train Engineer / Project Manager in identifying project risks
- Advise the System Architect Engineers in steering the implementation of the concept
- Implement the IT concept
- Document the infrastructure
Label: MS Project, LINUX, Windows, ORACLE, Java, REST, SharePoint, Microsoft Exchange, UML, Enterprise Architect, BPMN, AZURE, AWS, V-MODEL, Micro Service, VisualStudio, SAP S/4HANA, SCRUM(SAFE), ESB (TIBCO), Python, Innovator, LeanIX (TOGAF), Ansible, Ansible Tower, Ansible Automation, ROBOT, SpringBoot
Michael K.
Last position:
Enterprise Architect, Lead Architect of the transformation program and coach at Swiss Ministry
- Development of the overall architecture
- Support for the respective workstreams in developing architectures in the areas of infrastructure, data centers, security, and network topology
- Management of the architect pool
- Support for program management in setting up the transformation project based on agile methods
- Consideration of regulatory requirements for IT projects in the federal administration
Rainer L.
Last position:
Senior IT Consultant, Senior Software Architect, Senior Software Developer, Senior DevOps Engineer at Techniker Krankenkasse
Automation of the database major / minor releases for the TKeasy project
Concept for database major / minor release automation
As-is analysis
Evaluation of Redgate Flyway functionality
Concept creation
Products: Redgate Flyway, GitHub, Quest, Erwin Data Modeller, Oracle, Atlassian Jira, Atlassian Confluence
Skills: Docker, Continuous Delivery, Continuous Integration, Redgate Flyway, Major Releases, Minor Releases
Joaquim L.
Last position:
Freelance ABAP Developer, Logistics at Cheplapharm
- Tested integration of TIBCO EBX with SAP S/4HANA via TIBCO BusinessWorks – proof of concept
- Implemented use case: communication between TIBCO EBX and SAP S/4HANA via IDocs to exchange material master data and business partner data
- Customized, configured, and implemented inbound and outbound processing in the SAP S/4HANA environment for communication with the TIBCO EBX software interface
- Distributed classes, characteristics, and values between TIBCO BusinessWorks and SAP S/4HANA and customized the inbound processing
- Documented the technical components
Vladimir M.
Last position:
Developer at Financial services provider
- Support and further development of a framework for developing applications in a banking association: DynS/OSPE
- Migration of the framework to Java 11 and Java 17
- Java8, Java11 and Java17, Spring, Spring-Batch, Spring WebServices, Spring-Security, Spring-Data, JPA, Hibernate, OpenSource libraries etc.
- XML, JAXB, JSON, REST and SOAP services, DB2, Oracle, WebSphere or Liberty AS, FreeMaker, Junit, mock libraries, JaCoCo, Maven, IntelliJ, Eclipse, GitHub, SVN, Jira
Discover over 15,000 top freelancers
Statistics of experts using WSDL
Aggregated from the professional profiles of matched freelancers.
Experience
29 years
Position duration
1.7 years
Positions per freelancer
28
Top business areas
Information Technology, Product Development, Quality Assurance
Top industries
Information Technology, Transportation, Automotive
Certification focus areas
Information Technology, Human Resources, Operations
Bachelor's degree or higher
100%
Master's degree or higher
75%
Doctorate
25%
Certifications per freelancer
2
Most common languages
German, English, Latin
Speak two or more languages
83%
Based on our profile pool as of 19 Sep 2026.
Daily rate distribution
The chart shows how the daily rates of freelancers in this technology in Cologne are distributed, based on recent contracts on our platform. Each bar covers a rate range — its height shows how many freelancers charge within that range.
Average rates of experts in Cologne using WSDL
Rates are based on recent contracts and do not include FRATCH margin.
The average daily rate is the mean of all daily rates from recent contracts of comparable freelancers on our platform.
The median daily rate is the middle value of all daily rates — half of comparable freelancers charge less, half charge more. Unlike the average, it is barely affected by outliers.
Calculated based on our freelancers’ daily rates as of 19 Sep 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
WSDL experts industry focus
See which industries our matched freelancers work in most often — every figure is calculated live from the freelancers on FRATCH.
- Information Technology (100%)
- Transportation (83%)
- Automotive (67%)
- Banking and Finance (67%)
- Insurance (67%)
- Government and Administration (67%)
- Real Estate (67%)
- Aerospace and Defense (50%)
Please note that freelancers can work across multiple industries, so percentages overlap.
About the technology
What WSDL covers
WSDL, the Web Services Description Language, defines how a SOAP service is described for other systems. It spells out operations, messages, bindings, endpoints, and the structure clients need to call a service correctly.
Typical work
- Service contracts for SOAP interfaces
- Message and XML schema alignment
- Client stubs and server interfaces
- Endpoint and binding updates
- Service versioning and contract changes
Common stack
WSDL work often sits next to SOAP, XML Schema, XSD, and tools such as Apache CXF, JAX-WS, .NET WCF, and older enterprise integration suites. Strong specialists know how WSDL fits into the full service layer, not just the file itself.
Why companies hire help
Companies bring in freelance expertise when a contract is broken, an old service needs to be extended, or different systems no longer agree on messages. In Cologne, this often matters for enterprise IT, logistics, insurance, and public sector environments where SOAP interfaces still connect core applications.
What strong specialists do
A good WSDL specialist reads existing contracts fast, spots mismatches between schema and implementation, and keeps interfaces stable for downstream clients. They also write clear, maintainable definitions, handle namespace issues, and avoid changes that trigger hidden integration failures.
Signs you need one
If service consumers fail after a deployment, generated client code no longer matches the service, or documentation is missing, WSDL expertise is needed. It also helps when you are moving from legacy Web Services Description Language files to cleaner service contracts or modernizing parts of a SOAP estate.
Frequently asked questions
Curious about WSDL? Here are the answers that come up again and again.
WSDL is used to describe a SOAP web service so other systems know how to call it. It defines the operations, messages, data types, and endpoint details that client tools use to generate code and send requests correctly.
WSDL is the contract format most often tied to SOAP services, while OpenAPI is used for REST APIs. If a system already depends on SOAP, WSDL is usually the right fit; if the API is REST-based, OpenAPI is the more common choice.
A strong WSDL specialist usually understands SOAP, XML, XSD, namespaces, and service versioning. In many projects, knowledge of Java, .NET, or integration middleware is also important because the contract must match the code and the runtime behavior.
WSDL work can start with a small amount of context if the existing contract is clear. For safer changes, the specialist should also see the related schema files, sample messages, client expectations, and any downstream systems that depend on the interface.
Yes, WSDL projects are often handled remotely because the work is mostly contract review, implementation support, and testing. For Cologne-based teams, remote collaboration works well when the specialist can join code reviews and test cycles and communicate clearly in English or German as needed.
A strong WSDL freelancer can explain why a contract works, not just edit the file. Look for clear answers about namespaces, bindings, schema changes, backward compatibility, and how they test client and service behavior together.
Web Services Description Language is still relevant wherever SOAP services remain part of the system landscape. Many companies keep these interfaces alive inside billing, logistics, ERP, and other enterprise platforms, so WSDL skills are still useful for support and modernization.
A WSDL engagement usually results in updated service contracts, corrected XML schemas, working client stubs, and clear notes on interface changes. Good specialists also document assumptions and flag any breaking changes before they reach downstream consumers.
The average hourly rate of freelancers in Cologne, Germany who have used WSDL in their recent projects is 106 €, which corresponds to a daily rate of about 844 € based on an 8-hour working day.
Of the freelancers in Cologne, Germany who have used WSDL in their recent projects, 100% hold at least a Bachelor's degree, 75% hold at least a Master's degree, and 25% hold a doctorate.
On average, freelancers in Cologne, Germany who have used WSDL in their recent projects have 29 years of professional experience, with a single engagement typically lasting around 1.7 years.
The most common languages among freelancers in Cologne, Germany who have used WSDL in their recent projects are German (100%), English (83%), and Latin (33%).
The most common industries among freelancers in Cologne, Germany who have used WSDL in their recent projects are Information Technology (100%), Transportation (83%), and Automotive (67%).
The most common business areas among freelancers in Cologne, Germany who have used WSDL in their recent projects are Information Technology (100%), Product Development (100%), and Quality Assurance (100%).
Main locations of FRATCH Experts, who have recently used WSDL
Our freelancers and interim experts are at home across the DACH region — available on-site in the major business hubs or fully remote. Choose a location to discover matched specialists, local market insights and up-to-date availability.
Countries:
Berlin Hamburg Munich 
Cologne Frankfurt Stuttgart Dusseldorf Leipzig Dortmund Essen Bremen Dresden Hanover Nuremberg Request a free demo
Get in touch with the FRATCH team and we will get back to you within 4 hours.
Would you rather directly get in touch?
We always have the time for a call or email!
Philipp Thomaschewski
FRATCH CEO
