SOAP Experts in Cologne
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Meet FRATCH Experts in Cologne, who have recently used SOAP
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.
Yaroslav S.
Last position:
Senior Low-Code Consultant at Freelancer
Structured analysis and evaluation of business processes
Gathering, documenting, and prioritizing requirements
Creating business-friendly and technically executable process models
Use of Camunda tools
Deriving requirements and interfaces from BPMN diagrams
Coordination with stakeholders and business units
Translating business requirements into technical solution designs
Implementing efficient and tailored applications
Systematic collection, analysis, and documentation of requirements
Prioritizing and validating requirements in close collaboration with stakeholders
Alignment between business and development to ensure shared objectives
Creating use cases, user stories, and acceptance criteria
Continuous requirements and change management throughout the project lifecycle
Define project goals and create project plans
Delegate tasks and monitor project progress
Monitor budgets and inform stakeholders
Mendix: Architecture, development, and maintenance of custom applications (Microflows, Domain Model, Security, XPath)
Modeling Mendix workflows for process optimization
Develop scalable apps with Mendix including REST/SOAP integration with SAP, SQL, Azure & SharePoint
UI design for Mendix using Atlas UI, Fluent UI, HTML, CSS, JavaScript
Develop web & mobile apps with Mendix using agile methods (Scrum, Kanban)
Implement business logic with Mendix Microflows and Nanoflows
Performance optimization and architecture improvements for Mendix applications
Conduct Mendix training
Create technical documentation and best practices for Mendix
Coaching and mentoring for low-code development with Mendix
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
Stefan M.
Last position:
Bundesrechtsanwaltskammer
- Design, planning and execution of complex acceptance tests for a document exchange platform for the German justice authorities.
- Validation of decrypted and certificate-based message exchange via web platform, mobile app, and Java API.
- Documentation of test cases, execution steps, and test results.
- Technologies: Windows 11/10, Ubuntu, iOS, Android, Bash for Windows, Java 17, IntelliJ, Git, Jira, Confluence, Citrix Server, xJustiz standard implementation, specific justice software.
Allal K.
Last position:
Java Senior Full Stack Developer at Insurance ÖRAG
- Further development of a policy administration system (contract/claims) for the legal expenses insurer ÖRAG.
- My role: Senior Software Developer.
- The team consists of 12 developers.
- Technologies used: Java 8/21, Java EE, Quarkus, WebLogic, JPA, RabbitMQ, JTA, CI, CD, Jenkins, DB2, Maven, Jenkins, GIT (bitbucket) later GitLab, Junit, Elasticsearch, Mockito, Jira, SonarQube, Scrum, React, Workflow
- Migration and modernization of legacy systems: rewrote C and C++ code in Java to improve maintainability, scalability, and performance. Refactored Python into Java, including optimization and integration into modern architectures.
- Study on the use of AI (Codex) for implementing a Java feature. The goal is to compare the time spent and productivity of AI-supported development with a classic implementation by a developer. The results should show how strongly the use of AI affects development time and efficiency.
- Development of the following tariff calculators for the years 2024/2026: private, companies, doctors, farmers, owner-occupied G + H, landlords, traffic, club, top managers, sales representatives, special criminal law, savings bank, municipal, BayGT, doctors, Dehoga
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
Hamdi R.
Last position:
Full-Stack AI Developer at Karray-Pflege GmbH
PFS-Matching-App
- Integrated an intelligent LLM chatbot using LangChain4j, enabling conversational AI, context-aware question answering, document summarization, and autonomous tool execution.
- Implemented Retrieval-Augmented Generation (RAG), prompt engineering, and AI agent workflows to connect large language models with enterprise data and backend services.
- Developed RESTful APIs and secure backend services to support AI-driven interactions and business processes
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
Armen M.
Last position:
CTO/CPO Platform & Technology at Green Mobility Holding
- Overall responsibility for platform transformation across ERP, CRM, PIM, and AI-driven process automation
- ERP transformation: Implementing and migrating to Microsoft Dynamics 365 Business Central
- CRM & growth stack: Implementing HubSpot as the central CRM and a platform for lead and marketing automation
- Product data & commerce enablement: Introducing an ePIM to scale category management and digital commerce processes
- AI-driven process automation: Designing and implementing agent-based AI workflows to automate processes in business services, accounting, tender management, and marketing
- Building a scalable platform organization including product development, DevOps, UX, cloud engineering, and corporate IT
- Implementing modern product and portfolio governance (e.g., OKRs, portfolio boards, value-based roadmaps) to manage technology-driven initiatives
- Harmonizing heterogeneous system landscapes and transforming them into a modular, scalable platform architecture (ERP, CRM, PIM, integrated customer journeys)
- Coaching and developing product owners, tech leads, delivery managers, and UX teams to build a scalable product organization
René K.
Last position:
Freelancer at Freelance work
- Business analysis
- Requirements management
- Project management
- Stakeholder management
- Team leadership
Andreas K.
Last position:
Backend Developer at Univention GmbH
- Developed a SCIM-compliant Python interface to connect external systems
- Expanded and enhanced UCS modules in Python
- Extended and newly developed Helm charts for container orchestration in Kubernetes
- Maintained and further developed CI/CD pipelines in GitLab
- Implemented automated tests with Pytest and Playwright
'Nubus' is based on a microservice architecture, relies on open source technologies, and runs in Docker containers.
UCS is an IAM complete solution based on Debian, used as an alternative to Microsoft's Active Directory. The work was characterized by the close integration of infrastructure and application logic.
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
Jannik J.
Last position:
Freelance Salesforce Consultant & Developer at Self-employed
- Consulting and delivery of over 30 Salesforce projects (Sales Cloud, Service Cloud, Experience Cloud, Pardot, Marketing Cloud)
- Designing and setting up CRM architectures including requirements management, data modeling, and automation
- Implementing custom solutions (Apex, LWC, Flows, integrations)
- Developing interfaces with ERP, DMS, and email systems (SAP, Microsoft Dynamics, DocuWare, etc.)
- Introducing agile project methods (Scrum, Kanban) in client projects
- Coaching in-house Salesforce teams (admin and dev training)
Daniel L.
Last position:
Developer / Software Architect at rffl.io
- PHP 8.4
- Platform for sweepstakes: API-first approach with Symfony/API Platform
- API Platform 4.2 (REST, JWT, Doctrine/PostgreSQL, API documentation) plus AWS tools
- Symfony 7.3 for infrastructure, hosting, and subsequent operation on AWS with ECS
- Postgres
- AWS RDS, SQS, Fargate, RDS Postgres database, and AWS SQS message queue
- Managing infrastructure with Terraform
- After successfully implementing Terraform, the GmbH was founded as the next organizational step
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
Discover over 15,000 top freelancers
Statistics of experts using SOAP
Aggregated from the professional profiles of matched freelancers.
Experience
20 years
Position duration
3.5 years (Germany: 2.9 years)
Positions per freelancer
13 (Germany: 14)
Top business areas
Information Technology, Product Development, Quality Assurance
Top industries
Information Technology, Government and Administration, Telecommunication
Certification focus areas
Information Technology, Product Development, Project Management
Bachelor's degree or higher
93%
Master's degree or higher
71% (Germany: 55%)
Doctorate
7% (Germany: 9%)
Certifications per freelancer
3
Most common languages
German, English, French
Speak two or more languages
90% (Germany: 95%)
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 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 19 Sep 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 (90%)
- Government and Administration (40%)
- Telecommunication (40%)
- Automotive (35%)
- Banking and Finance (35%)
- Insurance (35%)
- Transportation (35%)
- Professional Services (35%)
Please note that freelancers can work across multiple industries, so percentages overlap.
About the technology
What SOAP is
SOAP, or Simple Object Access Protocol, is a messaging framework for structured communication between applications. It uses XML envelopes and formal service contracts, commonly described with WSDL. SOAP web services remain important where strict interfaces, traceability and reliable enterprise integration matter.
Where it runs
SOAP connects business systems across finance, insurance, logistics, healthcare and public services. It often links established applications with newer portals, middleware or partner systems, especially when a controlled contract matters more than a lightweight interface.
- Connect ERP, CRM and billing systems
- Expose or consume WSDL-based services
- Integrate partner and government interfaces
- Support document and transaction workflows
Ecosystem and tooling
Strong SOAP specialists work with XML Schema, WSDL, XPath and XSLT, as well as frameworks such as JAX-WS, Apache CXF and Spring Web Services. They understand SOAP headers, fault messages, namespaces and transport options, including HTTP and message-oriented middleware. Testing commonly involves SoapUI or comparable service tools.
Security and reliability
SOAP projects often depend on WS-Security for message signing, encryption and authentication. Professionals may also handle WS-Addressing, WS-ReliableMessaging, certificates, policy files and enterprise identity systems. Careful fault handling, retries, logging and schema validation help protect long-running integrations.
When companies need help
Freelance expertise is useful when a legacy service must be stabilized, a partner contract must be integrated or a platform migration threatens existing interfaces. It also helps when internal teams need focused support without losing control of documentation and operations.
- Map undocumented service behavior
- Create or update WSDL and XML schemas
- Diagnose interoperability and certificate issues
- Replace outdated endpoints without breaking consumers
What strong specialists deliver
Effective SOAP professionals clarify the contract before changing code. They can trace a request across applications, explain namespace and encoding problems, test positive and fault paths, and document dependencies for future maintenance. They also know when SOAP is the right fit and when a REST, messaging or event-based design is more suitable. For Cologne-based teams, remote delivery can work well when access, security reviews and communication routines are defined; on-site collaboration may help with complex system landscapes.
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 applications through defined service contracts. Companies rely on it for partner integrations, financial transactions, identity workflows and other processes where formal schemas, security and reliable fault handling are important.
SOAP provides a formal messaging model with WSDL, XML schemas and standards such as WS-Security. REST is usually simpler and more flexible for resource-based web APIs, while SOAP can be preferable when strict contracts, enterprise policies or message-level security are central.
SOAP work often requires XML Schema, WSDL, XPath, XSLT and HTTP knowledge. Useful adjacent skills include Java or .NET service frameworks, API gateways, certificates, identity systems, middleware and automated integration testing.
SOAP experience should match the integration risk, not just the framework name. A specialist handling a simple service call may need a narrower background, while security-heavy or legacy landscapes call for someone who has diagnosed contracts, namespaces, certificates, faults and production dependencies.
SOAP projects can usually be delivered remotely when specialists receive secure access to documentation, test environments and service logs. Cologne companies may choose on-site sessions for system discovery or security reviews, while clear German or English communication keeps distributed work effective.
SOAP quality is visible in precise contracts, predictable fault handling and tests that cover security, schemas and interoperability. Ask for clear interface documentation, traceable logs, deployment guidance and an explanation of how changes will avoid breaking existing consumers.
SOAP can still be sensible when a partner requires it or when formal contracts, message security and enterprise standards are essential. For simpler public APIs, REST or event-driven messaging may reduce complexity, so the decision should follow the integration constraints rather than fashion.
SOAP specialists may deliver service contracts, XML schemas, client or endpoint implementations, security configuration and automated tests. They can also document undocumented interfaces, resolve interoperability problems and support a controlled migration without disrupting connected systems.
The average hourly rate of freelancers in Cologne, Germany who have used SOAP in their recent projects is 96 €, which corresponds to a daily rate of about 770 € based on an 8-hour working day.
Of the freelancers in Cologne, Germany who have used SOAP in their recent projects, 93% hold at least a Bachelor's degree, 71% hold at least a Master's degree, and 7% hold a doctorate.
On average, freelancers in Cologne, Germany who have used SOAP in their recent projects have 20 years of professional experience, with a single engagement typically lasting around 3.5 years.
The most common languages among freelancers in Cologne, Germany who have used SOAP in their recent projects are German (100%), English (90%), and French (15%).
The most common industries among freelancers in Cologne, Germany who have used SOAP in their recent projects are Information Technology (90%), Government and Administration (40%), and Telecommunication (40%).
The most common business areas among freelancers in Cologne, Germany who have used SOAP in their recent projects are Information Technology (100%), Product Development (90%), and Quality Assurance (75%).
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.
Berlin 
Hamburg 
Munich 
Frankfurt 
Stuttgart 
Dusseldorf 
Essen Countries:
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