SOAP Experts in Dusseldorf
for reliable integrations, matched fast with vetted and available freelancersHire experts who connect enterprise systems, design WSDL-based services and secure XML integrations with WS-Security. Get precise, fast matching with vetted, available freelancers who can work remotely or alongside your team in Dusseldorf.
Meet FRATCH Experts in Dusseldorf, who have recently used SOAP
Emre S.
Last position:
IT Project Manager | SAP E-Invoicing Outbound at Rohde & Schwarz
Project: Introduction of statutory-compliant electronic invoicing (outbound, Germany) in SAP for an international technology group.
- Project management: Planning, steering and reporting of the E-Invoicing outbound rollout across all affected business areas, including budget and resource coordination.
- UAT: Structured user acceptance test with key users per business area, test cases per invoice scenario, and consolidated test results for decision making.
- Defect management: Handover and tracking of defects in Jira, including validation of the generated invoices against the statutory schemas.
- Cutover, go-live and hypercare: Readiness checks and cutover planning aligned with the statutory deadlines, coordination of go-live and stabilization during hypercare.
- Stakeholder management and reporting: Alignment with Finance, Tax, business departments and IT, preparation of status reports and decision papers, and consistent follow-up of open items.
- Change management and documentation: Communicated process changes to the business departments, enabled key users, and created process and compliance documentation to ensure traceability and audit readiness.
Marijn S.
Last position:
Senior Software Engineer at Puls Security GmbH
Optimizing and acceleraÂtion of our Gitlab CI pipeline
Conceptual work for the PoC of the Zero Trust system
Extension of the policy-engine backend in Go
Extension of the policy-testing mechanism in Python
Architectural design of the PEP component of Zero Trust
Documentation of the product
Technologies: Zero Trust, Go, Python, Gitlab CI, Docker, JWT, Domain-Driven Design
Anupriya P.
Last position:
Senior Software Engineer at Telefonica Germany
(Maternity/Parental Leave: July 2023 – Aug 2024)
- Domain: Payment Domain | Client: Telefonica Germany
- Project: General Payment Service
The General Payment Service is responsible for processing of online payments via external payment service provider like Safer pay and PayPal
- Developed Design of Use (DOU) and interface contract documentation, ensuring clarity and compliance across system integrations
- Designed and delivered REST/SOAP web services with Spring Boot and Spring Data JPA, publishing Swagger contracts through WSO2 API Gateway to improve accessibility and governance.
- Spearheaded the on-premises to AWS Cloud migration, re-platforming from Oracle to PostgreSQL on AWS RDS and deploying services on EC2, improving scalability and cost efficiency.
- Containerized microservices using Docker and orchestrated deployments with Kubernetes, streamlining deployment pipelines and improving system reliability.
- Implemented proactive monitoring and logging via AWS CloudWatch and Kibana, ensuring stability and performance during cutover.
- Enhanced collaboration through code reviews and peer reviews, promoting maintainability and clean coding standards.
- Strengthened quality by writing comprehensive JUnit tests and preparing detailed test cases enabling early defect detection
- Delivered automated API testing with Ready API, Postman, and SOAPUI, and conducted performance testing with JMeter, ensuring reliability in high-transaction environments.
Thorsten L.
Last position:
Senior Security Analyst
- Analysis and remediation of security vulnerabilities in a risk assessment system for energy trading
- System analysis
- Threat modeling
- Decision-making on vulnerability mitigation strategies
- Implementation of vulnerability detection mechanisms
- Security scans
- DevSecOps practices
- Technical environment: Visual Studio Code, JetBrains Suite, MS Threat Modeling Tool, DevSecOps, Git, AWS, DynamoDB, SQL Server, Endur, Snowflake, Orca
- Languages: C#, JavaScript, TypeScript, Python, PowerShell, Bash, Terraform, SQL
Klajdo F.
Last position:
Independent Product Developer / Software Architect at rastr.eu
- Architected and deployed a live B2B geocoding and demographic-data platform for Germany, combining address lookup with census-based population statistics through a web application and REST API.
Dmitry T.
Last position:
Web Software Engineer at Freelancer
Third-side integration development (REST: Amazon, OpenAI, Etsy, Shopware, Prestashop, etc)
Performance optimization (Refactoring, SQL analysis)
LMS development and deployment (Moodle)
Cloud deployment automation (Amazon, Azure, Gitlab CI/CD, Docker)
Backend and Frontend development (Laravel, VueJs)
Collaboration with partner-developers (national and international)
Shirtigo GmbH
GRELLARTIG Digital GmbH
velpTEC edutainment GmbH
Stanislaus S.
Last position:
Security Consultant at Rohde & Schwarz AG at Star Labs GmbH
- Worked on FPGA enhanced network encryption device with secure boot, TPM2.0 and smart card integration for BSI approved usage with Post Quantum Cryptography
- Developed and audited Linux drivers
- Collaborated using GitLab, Gerrit, Confluence and Jira
- Technologies: C, C++, Secure Boot
Dalia C.
Last position:
Oracle Developer at Freelance
- Design and implementation of an OCI-based DWH and ETL system to replace legacy mainframe applications
- Development of a database optimization strategy and planning the rapid conversion of JCL and COBOL routines to PL/SQL with the help of AI
- Development of an Oracle Apex-based app for internal administrative processes in the public sector (office equipment, employee training)
- Implementation of PL/SQL workflows for approval processes and creation of a responsive mobile version with JavaScript and CSS
- Use of Azure DevOps for backlog and documentation, as well as Git for version control
- Development of REST interfaces for CRM systems
- Replacement and reprogramming of Oracle Forms screens with Oracle Apex and upgrading to the latest Apex versions
- Design of a Git branching strategy and conducting code reviews
- Maintenance and further development of an EDI-based data exchange system based on Oracle Advanced Queuing for the public sector in Austria
- Data analysis and creation of charts in the Oracle Apex frontend; installation of standalone ORDS and Apex 23.1
- Agile working according to the Spotify Model; development of complex Apex screens with the support of Oracle JET
- New development and customization of existing PL/SQL packages, workarounds for database version differences and query optimization
- Development of Apex applications for broker pools to manage and optimize Oracle databases in the banking sector, including SSO-based authorization systems with OAuth2 and Keycloak
- Development of extensive Oracle Apex applications for BI and data mining modernization projects, as well as development of manual and automated projection methods in the frontend
- Implementation of data warehousing projects in the banking sector and use of Scrum and Kanban in team-oriented projects
René T.
Last position:
Managing Director at Le Shop Vegan
- Shop & ERP system, performance marketing
- Fulfilment: setup & operation of warehouse & shipping
- Finance: control & liquidity planning
Daniel U.
Last position:
Senior Application Packaging & Deployment Engineer at Allevio AG (Client: Allianz Technology)
- Enterprise application packaging and deployment for Allianz's global Windows migration programs across Europe, North America, and APAC
- Migrated hundreds of enterprise applications from Windows 10 VDI to Microsoft Azure Windows 365 (Windows 11)
- Created software packages in MSI/MST, FlexApp, PSADT 3/4, and App-V according to enterprise packaging standards
- Developed an ASP.NET packaging automation platform with MongoDB, SQL Server, SharePoint, and Outlook integration
- Built PowerShell modules for automated quality checks of MSI and FlexApp packages
- Developed a release conflict detection module in PowerShell to identify potential deployment issues before production
- Created WDAC monitoring scripts for automated policy oversight and incident response
- Implemented MSGraph API calls in PowerShell for Azure AD and Intune operations
- Created Citrix oData scripts for historical usage analysis (BYOD, VDI, fat clients)
- Developed an Intune Win32 app 'Do Not Disturb' deployment routine for an optimal user experience
- First point of contact for troubleshooting production incidents with packaged applications
- Coordinated application owner, UAT, and release testing for hundreds of deployments
- Administered Microsoft Intune, Citrix environments, and SQL Server security
- Created and tested WDAC policies in Intune; managed configuration policies and Win32 app deployments
- Primary packaging resource for Allianz France since 2019
Sebastian C.
Last position:
Public institution responsible for educational institutions in NRW
- Consulting on processes and execution of load tests, performance tests and technical tests of various applications: web portal, file cloud, email, video conferencing, learning/course platform
- Creating the load test framework
- Programming test scripts (JMeter, Selenium)
- Developing batches to support the evaluation
- Executing load tests and evaluating results, including clear reporting, recommendations for action, and bottleneck analysis
- Managing tasks and collaboration to achieve meaningful load test results
Jacqueline H.
Last position:
Kitchen Appliance Manufacturer
Setting up and enhancing an international subscription management system
Migrating and decommissioning a Hybris-SAP system and integrating Zuora
Implementing numerous interfaces to various systems (external and internal)
Setting up and improving monitoring with Grafana, Prometheus, and Databricks
Introducing logging with Loki
Implementing business requirements using jQuery, Thymeleaf, Spring Boot, Java, Go, and Python
Adjusting and extending the GitLab CI pipelines
Setting up and extending infrastructure as code with Terraform and ArgoCD on AWS
Setting up and running E2E and performance tests
Expanding the Databricks business intelligence solution to provide various KPIs
Responsibilities: Architecture, DevOps, development, unit tests, coaching employees and apprentices, E2E, smoke, and integration tests, agile methods consulting (Kanban, Scrum)
Technologies and methods: Java, Go, Kotlin, Node.js, Spring Boot, SOAP/REST, Quarkus, Thymeleaf, Vaadin, Slack, Jira, Confluence, IntelliJ, GitLab, SQS, Kafka, AWS, Kubernetes, Terraform, Maven, Gradle, GitLab CI, Databricks
Daniel M.
- SaaS including subscription management and mobile app
Discover over 15,000 top freelancers
Statistics of experts using SOAP
Aggregated from the professional profiles of matched freelancers.
Experience
17 years (Germany: 20 years)
Position duration
3 years
Positions per freelancer
11 (Germany: 14)
Top business areas
Information Technology, Product Development, Quality Assurance
Top industries
Information Technology, Banking and Finance, Manufacturing
Certification focus areas
Information Technology, Product Development, Project Management
Bachelor's degree or higher
91% (Germany: 93%)
Master's degree or higher
64% (Germany: 55%)
Doctorate
27% (Germany: 9%)
Certifications per freelancer
12 (Germany: 3)
Most common languages
German, English, French
Speak two or more languages
100% (Germany: 96%)
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 Dusseldorf 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 Dusseldorf using SOAP
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.
SOAP 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 (85%)
- Banking and Finance (62%)
- Manufacturing (62%)
- Retail (54%)
- Education (38%)
- Government and Administration (38%)
- Telecommunication (38%)
- Automotive (31%)
Please note that freelancers can work across multiple industries, so percentages overlap.
About the technology
What SOAP does
SOAP is an XML-based messaging protocol for exchanging structured data between applications. It commonly supports enterprise integrations where strict contracts, formal error handling, security policies and reliable communication matter. Services can run over HTTP and other transport protocols.
Where it fits
SOAP is widely used to connect banking, insurance, healthcare, manufacturing and public-sector systems. It appears in internal service layers, partner integrations, payment workflows and legacy platforms that must continue exchanging data with newer applications. Dusseldorf companies often bring in specialists when established enterprise systems need dependable integration without disrupting core operations.
Core ecosystem
- WSDL defines service operations, messages and data types.
- XML Schema validates the structure and content of exchanged data.
- SOAP headers carry metadata such as authentication and transaction details.
- WS-Security, WS-Addressing and WS-ReliableMessaging support demanding integrations.
- Java JAX-WS, Spring Web Services, .NET WCF and Apache CXF are common tooling choices.
Typical deliverables
- Model service contracts and XML schemas for new integrations.
- Build SOAP endpoints and client connectors for enterprise applications.
- Map data between ERP, CRM, billing and operational systems.
- Add authentication, signing, encryption and policy enforcement.
- Test fault responses, namespaces, compatibility and message ordering.
When expertise matters
Companies seek freelance specialists when a service must integrate with a bank, insurer, supplier or government interface that requires SOAP. Other triggers include undocumented legacy services, failed production messages, a migration from WCF or JAX-WS, and a need to expose stable contracts to modern applications. Strong specialists can review existing WSDL files, isolate integration risks and document decisions clearly for distributed teams.
Signs of quality
A capable professional understands XML namespaces, schemas, XSD validation, WSDL design and the difference between transport security and message security. They can trace a fault from application logs through headers and network traffic, then reproduce it with suitable tools such as SoapUI or automated contract tests. Look for careful versioning, readable mappings, explicit fault contracts and practical knowledge of REST, messaging systems and identity standards.
Frequently asked questions
Curious about SOAP? Here are the answers that come up again and again.
SOAP is used to exchange structured XML messages between systems through formally defined service contracts. Companies use it for enterprise integrations, partner interfaces, financial transactions, identity services and other workflows where security, validation and predictable error handling are important.
SOAP provides a protocol with formal rules for envelopes, headers, faults and extensions such as WS-Security. REST is an architectural style that often uses HTTP and JSON with less ceremony, so the right choice depends on existing contracts, security requirements, interoperability needs and the systems that must connect.
A strong SOAP specialist should understand XML, XSD, WSDL, XPath, namespaces and HTTP. Useful adjacent skills include Java or .NET, Spring Web Services or WCF, identity standards, certificate management, message queues, API gateways, automated testing and observability.
The required depth depends on the integration risk rather than the size of the codebase. A straightforward client connection may need solid XML and WSDL knowledge, while regulated or business-critical SOAP services call for someone who can handle WS-Security, certificates, contract evolution, retries, faults and production diagnostics.
SOAP work is often suitable for remote collaboration when the team can provide secure access to specifications, test environments and logs. For projects involving protected systems or complex stakeholder coordination in Dusseldorf, occasional on-site workshops can help, while clear documentation and fluent communication remain essential.
Ask the SOAP professional to explain a real integration from contract design through testing and production support. Good answers cover namespaces, schema validation, fault handling, message-level security, compatibility and how they diagnosed failures rather than focusing only on endpoint implementation.
Keep SOAP when partner contracts, regulatory controls, generated clients or established enterprise workflows depend on it and the service remains reliable. A replacement can make sense when the interface is hard to maintain, consumer needs have changed or a carefully planned migration reduces operational risk.
Teams often use SoapUI to send requests, inspect envelopes, validate responses and test faults. Professionals may also use automated contract tests, XML schema validators, application logs, network tracing and build tools integrated with Java or .NET delivery pipelines.
The average hourly rate of freelancers in Dusseldorf, Germany who have used SOAP in their recent projects is 99 €, which corresponds to a daily rate of about 795 € based on an 8-hour working day.
Of the freelancers in Dusseldorf, Germany who have used SOAP in their recent projects, 91% hold at least a Bachelor's degree, 64% hold at least a Master's degree, and 27% hold a doctorate.
On average, freelancers in Dusseldorf, Germany who have used SOAP in their recent projects have 17 years of professional experience, with a single engagement typically lasting around 3 years.
The most common languages among freelancers in Dusseldorf, Germany who have used SOAP in their recent projects are German (100%), English (100%), and French (38%).
The most common industries among freelancers in Dusseldorf, Germany who have used SOAP in their recent projects are Information Technology (85%), Banking and Finance (62%), and Manufacturing (62%).
The most common business areas among freelancers in Dusseldorf, Germany who have used SOAP in their recent projects are Information Technology (100%), Product Development (85%), and Quality Assurance (69%).
Main locations of FRATCH Experts, who have recently used SOAP
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.
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Hamburg 
Munich 
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Frankfurt 
Stuttgart 
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Philipp Thomaschewski
FRATCH CEO
