WSDL Expert in Cologne
for reliable SOAP integrations, matched in minutes with vetted and available professionalsHire experts who define SOAP service contracts, maintain XML and XSD schemas, and connect enterprise systems through WSDL-based integrations. FRATCH matches you quickly and precisely with vetted, available freelancers for your project.
Meet FRATCH Experts in Cologne, who have recently used WSDL
Joaquim L.
Last position:
SAP Senior ABAP Developer
SAP Data Migration Greenfield QM
In the QM module project, the focus was on migrating inspection plans and transferring Dynpro applications from the ECC system to the HANA system while adhering to development guidelines and clean code principles. The project involved the use of technologies and concepts such as ABAP Objects (ABAP OO), Clean Code practices, SMOD/CMOD enhancements, User Exits, Function Exits, BAdIs, interfaces, and classes. Writing complex reports for download and upload of change pointer information of inspection plan header.
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
Assessment of the current state
Evaluation of Redgate Flyway functionalities
Concept development
Products: Redgate Flyway, GitHub, Quest, Erwin Data Modeller, Oracle, Atlassian Jira, Atlassian Confluence
Knowledge: Docker, Continuous Delivery, Continuous Integration, Redgate Flyway, Major Releases, Minor Releases
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.
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
30 years (Germany: 26 years)
Position duration
1.5 years (Germany: 2.2 years)
Positions per freelancer
28 (Germany: 17)
Top business areas
Information Technology, Product Development, Quality Assurance
Top industries
Information Technology, Automotive, Transportation
Certification focus areas
Information Technology, Project Management, Customer Service
Bachelor's degree or higher
100%
Master's degree or higher
80% (Germany: 56%)
Doctorate
20% (Germany: 7%)
Certifications per freelancer
4 (Germany: 2)
Most common languages
German, English, Latin
Speak two or more languages
100% (Germany: 97%)
Based on our profile pool as of 29 Oct 2026.
Daily rate distribution
The chart shows how the daily rates of experts in this technology in Cologne are distributed, based on recent contracts on our platform. Each bar covers a rate range — its height shows the share of experts charging 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 29 Oct 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%)
- Automotive (83%)
- Transportation (83%)
- 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
Service contracts
WSDL, or Web Services Description Language, is an XML-based format for describing web services. It defines available operations, message structures, data types, bindings and service endpoints, giving client and server teams a shared contract for SOAP communication. Companies use it to make enterprise integrations explicit and predictable.
SOAP integration
WSDL is closely tied to SOAP services, where the contract guides message exchange between systems. It supports document-oriented and remote-procedure-style integrations across internal applications, partner networks and legacy environments. Experts use the contract to generate client stubs, validate requests and coordinate changes between service owners.
Schemas and tooling
Strong WSDL work depends on the surrounding XML ecosystem. Professionals commonly work with XML Schema Definition (XSD), SOAP headers, namespaces, WS-Addressing, WS-Security and policy files. They may also use contract generators, SOAP testing tools, API gateways, Java or .NET service frameworks, and service registries where the environment requires them.
Where it fits
Companies bring in freelance expertise when a service landscape needs integration, repair or controlled modernization.
- Define or revise contracts for SOAP services
- Generate and troubleshoot clients from WSDL files
- Map XML schemas between enterprise systems
- Diagnose namespace, binding and endpoint errors
- Prepare migration paths toward REST or OpenAPI where appropriate
When specialists help
External specialists are useful during ERP, CRM, banking, insurance, logistics and public-sector integration work, especially when documentation is incomplete or several vendors share responsibility. In Cologne, local teams may need on-site workshops for interface discovery, while distributed delivery can cover contract reviews, testing and implementation remotely. Clear technical English and, where needed, German communication help keep decisions traceable.
What quality looks like
A capable WSDL professional reads the contract critically rather than treating it as generated boilerplate. They understand XML namespaces, schema imports, bindings, SOAP faults, security headers and backward compatibility. They test real payloads, document assumptions, protect sensitive data and explain how a contract change affects clients, deployments and partner systems.
Frequently asked questions
Curious about WSDL? Here are the answers that come up again and again.
WSDL describes the interface of a web service in a machine-readable XML contract. It tells client and server teams which operations exist, which messages and data types they use, how requests are bound to SOAP, and where the service is available.
WSDL is most commonly associated with SOAP and formal XML contracts, while REST describes an architectural style based on resources and HTTP behavior. OpenAPI usually documents REST or HTTP APIs in a more lightweight format, so the right choice depends on existing systems, governance, security requirements and partner expectations.
Web Services Description Language work usually requires strong XML and XSD knowledge, along with SOAP, namespaces, bindings and fault handling. Experience with WS-Security, Java or .NET service frameworks, API testing and enterprise integration patterns is also valuable.
WSDL projects need a professional who has handled the specific level of contract complexity involved, not simply someone familiar with the file format. Straightforward client generation may need focused integration experience, while regulated or partner-heavy systems call for deeper knowledge of schemas, security, versioning and production troubleshooting.
WSDL work is often suitable for remote collaboration because contracts, schemas, test payloads and service logs can be reviewed digitally. On-site sessions in Cologne can still help when teams must discover undocumented interfaces, align several departments or coordinate access to protected enterprise systems.
WSDL quality shows in precise contract analysis, valid XML, reliable test cases and clear handling of namespaces, imports, faults and compatibility. Ask a professional to explain a past integration problem, the evidence used to diagnose it, and how changes were communicated to consuming teams.
WSDL may remain the practical choice when established partners, transactional guarantees, enterprise security policies or generated SOAP clients depend on it. Replacement makes more sense when the surrounding ecosystem has moved to REST or event-driven integration and the migration benefits outweigh the risk of disrupting existing consumers.
Web Services Description Language assignments require clarity about the authoritative contract, available schemas, service ownership, environments and test access. Freelancers should also confirm whether they are expected to modify the service, generate clients, resolve production faults, document the interface or support a broader modernization effort.
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, 80% hold at least a Master's degree, and 20% hold a doctorate.
On average, freelancers in Cologne, Germany who have used WSDL in their recent projects have 30 years of professional experience, with a single engagement typically lasting around 1.5 years.
The most common languages among freelancers in Cologne, Germany who have used WSDL in their recent projects are German (100%), English (100%), and Latin (33%).
The most common industries among freelancers in Cologne, Germany who have used WSDL in their recent projects are Information Technology (100%), Automotive (83%), and Transportation (83%).
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.
Berlin Hamburg Munich 
Cologne Frankfurt Stuttgart Dusseldorf Leipzig Dortmund Essen Bremen Dresden Hanover Nuremberg 
Munich Request a free demo
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FRATCH CEO
