XML Experts in Cologne
for reliable data exchange, matched in minutes with vetted freelancersHire experts who design XML schemas, transform structured data with XSLT and XPath, and connect enterprise systems through standards such as SOAP and RSS. FRATCH matches you quickly and precisely with vetted, available freelancers.
Meet FRATCH Experts in Cologne, who have recently used XML
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
Henning U.
Last position:
Senior Expert Data Governance, Master Data Quality and Data Migration at E.ON
- Planning and implementation of a migration strategy for master and transaction data for the continuous loading of a cloud-independent database
- Creation and pilot implementation of a company-wide Business Data Model for customers, suppliers, contracts, products, prices, consumption, invoices, and dunning
- Concept and consulting for a Data Governance Framework incl. definition of committees, roles, processes, and metadata model
- Operationalization of the Data Governance Framework with definition of data standards
- Sub-project management in two pilot projects (PoCs) for Data Governance systems (ErwinDIS and Atlan)
- Training and coaching the data team in migration, data quality, and data modeling
Christoph S.
Last position:
Test Manager at Logistics
- Coordination and planning, execution, documentation, and analysis of test cases
- Development of test concepts considering best practices (e.g., test pyramid) with a focus on reliable, automatable test runs
- Implementation and maintenance of test cases according to the test concepts
- Technologies: Citrix Workspace, Shopify, Jira, Xray, MS Teams, MS SharePoint, Confluence, MS Office 365
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
Peter S.
Last position:
SAP FI/CO/PSM Consulting at Federal Authority
- SAP ERP/ECC, SAP S/4 Hana
- Analysis and documentation of SAP FI/CO, PSM, PSCD customizing
- Analysis, consulting and documentation of S/4 Hana apps for defining and preparing statutory reports
- Clarification of the prerequisites for using S/4 Hana apps to define and prepare statutory reports
- Analysis and documentation of customizing for in-house developments
- Consulting on the integration of SAP FI/CO as well as PSM, PSM-FM (Funds Management), Contract Accounts Receivable and Payable (PSCD)
- Consulting and documentation of customizing adjustments in SAP FI/CO, PSM, PSM-FM and PSCD for the introduction of new company codes and other organizational structures
- Consulting and documentation of required process adjustments
Manuel S.
Last position:
Project Manager at Univention
Industry: digital sovereignty, public sector
Responsibilities:
- Project coordination (teams: consulting, development, testing, deployment/operations)
Products and standards:
- Jira, Confluence, Asana, Miro, Mural
- Open Source, Keycloak, Open Xchange, ownCloud
Alexander K.
Last position:
Software Tester at Buhl Tax Service GmbH
- AI-assisted creation of test cases and test data
- Creation of test cases based on requirements
- Execution of manual tests
- Defect documentation, retesting and tracking
Technologies & Tools: SCRUM, Jira, Confluence, Zephyr Scale
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
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
Alexander R.
Last position:
Business Analyst at Financial Services Provider Landesbank
The Helaba ATLAS project aims to modernize core systems and make them future-proof. As part of the subproject, the existing legacy system for international payments is being replaced by a modern web-based application.
- Analysis of functional and technical requirements
- Analysis and optimization of business processes
- Process modeling
- Preparation and facilitation of workshops
- Defining project scope and prioritizing requirements
- Business process management (analysis, modeling, and optimization)
- Specification of user stories
- Designing business and authorization concepts
- Testing and acceptance
- Designing mockups in Figma
- Creating the UI/UX style guide for web applications Approach: Scrum (agile) Technologies: Jira, Confluence, MS Teams, Conceptboard, Java, Vaadin, Figma
Jens H.
Last position:
#52 Test Manager in Safety-Critical Infrastructure at Telecommunications Company
- Network elements, network, operational and operator-related systems
- Supporting around 20 different products (managed agile)
- Requirements analysis and management (functional and non-functional)
- Test concept and planning (scope, test phases, effort, schedule, resources, organization, etc.)
- Aligning approach with clients and service providers
- Managing and assisting in creation of test cases for system, integration and end-to-end tests
- Guiding and supporting test execution
- Defect management and planning bug fixes with external providers
- Preparing and facilitating workshops
- Regular reporting and creating automated test reports
- Further development of agile testing methodology and configuration of supporting tools
- Conceptual support in developing a quality seal for rating product and service quality of internal and external providers
- Requirements engineering based on ISO/IEC 25010, Scrum, SaFE
- BMC Remedy, Atlassian Confluence, Atlassian Jira (including plugins Xray, Structure), Microsoft Office (incl. Visio), Obsidian, doxis document management system, Gitlab, Obsidian
Discover over 15,000 top freelancers
Statistics of experts using XML
Aggregated from the professional profiles of matched freelancers.
Experience
24 years (Germany: 23 years)
Position duration
3.4 years (Germany: 5.2 years)
Positions per freelancer
18 (Germany: 16)
Top business areas
Information Technology, Product Development, Quality Assurance
Top industries
Information Technology, Banking and Finance, Transportation
Certification focus areas
Information Technology, Project Management, Product Development
Bachelor's degree or higher
96% (Germany: 88%)
Master's degree or higher
65% (Germany: 53%)
Doctorate
4% (Germany: 9%)
Certifications per freelancer
4 (Germany: 3)
Most common languages
German, English, French
Speak two or more languages
94% (Germany: 97%)
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 XML
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.
XML 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 (97%)
- Banking and Finance (62%)
- Transportation (53%)
- Automotive (47%)
- Insurance (47%)
- Manufacturing (44%)
- Government and Administration (44%)
- Telecommunication (44%)
Please note that freelancers can work across multiple industries, so percentages overlap.
About the technology
Foundations
XML, or Extensible Markup Language, structures data in a readable, extensible format. It separates content from presentation and lets systems exchange information through defined elements, attributes and document rules. XML remains common in enterprise integration, publishing, configuration and regulated data flows.
What It Builds
Companies use XML for business documents, product catalogs, invoices, feeds, configuration files and service messages. It supports formats such as XHTML, SVG, RSS and industry-specific schemas. Its strict structure helps different applications interpret the same data consistently across teams and vendors.
- Define XML schemas with XSD
- Transform documents with XSLT
- Query and validate content with XPath
- Integrate SOAP and other XML-based services
Ecosystem
The XML ecosystem includes DTD and XSD validation, namespaces, XPath, XSLT and XQuery. Specialists may work with DOM, SAX or streaming parsers, alongside Java, .NET, Python and JavaScript systems. They also use editors, validators, API tools, document databases and continuous integration checks to keep files correct.
When to Hire
Freelance expertise helps when an XML interface is failing, a legacy integration needs modernization or a schema must evolve without breaking consumers. It is also useful for migrations, document automation and audits of complex message flows. In Cologne, specialists may support local teams on-site or collaborate remotely with international stakeholders in English or German.
- Stabilize inconsistent schemas
- Map XML to JSON, CSV or database models
- Diagnose namespace and encoding errors
- Document interfaces for internal and external users
Strong Specialists
Strong XML professionals understand data modeling as well as syntax. They create precise schemas, handle namespaces deliberately, protect backward compatibility and test invalid input. They can explain trade-offs between DOM and streaming approaches, trace transformations through XSLT, and make integrations observable and maintainable.
Project Fit
Before engaging a specialist, clarify the source formats, target systems, validation rules and expected document volume. Share sample files, schemas, transformation logic and error cases where possible. The right professional can then estimate the integration scope, identify hidden dependencies and deliver tested mappings, parsers, schemas or transformation pipelines.
Frequently asked questions
Before you brief your next project: the most common questions about XML.
XML is used to structure, store and exchange data between applications, organizations and services. Common examples include enterprise messages, invoices, configuration files, publishing workflows, product catalogs and document formats.
XML offers namespaces, attributes, mature schema standards and strong support for document-oriented content. JSON is often more compact and convenient for web APIs, while XML remains valuable where validation, mixed content, legacy integration or established enterprise standards matter.
A strong XML specialist often works with XSD, XPath, XSLT, XQuery, namespaces and XML Schema validation. Depending on the project, useful adjacent skills include SOAP, REST, Java, .NET, Python, SQL, API testing and message queues.
The required depth depends on the document and integration landscape, not on the file extension alone. A simple transformation may need focused XSLT knowledge, while a multi-system migration requires expertise in schema design, versioning, parsing, testing and legacy interfaces.
Yes. XML work is often well suited to remote collaboration because schemas, sample documents, mappings and test results can be shared digitally. On-site sessions in Cologne can still help when specialists must map undocumented processes or coordinate closely with business and integration teams.
XML is a strong choice when documents need formal schemas, namespaces, rich hierarchical content or compatibility with established enterprise and industry standards. A different format may be preferable when the main priority is compact payloads and straightforward browser or mobile API consumption.
Ask for clear schemas, representative test files and evidence that valid and invalid documents are handled deliberately. High-quality XML work includes namespace-safe transformations, meaningful validation errors, documented mappings, compatibility considerations and automated tests.
A freelancer should ask which systems produce and consume the documents, which schemas are authoritative, and how changes are versioned. For XML assignments, sample payloads, encoding rules, namespace conventions, error handling and delivery constraints are especially important.
The average hourly rate of freelancers in Cologne, Germany who have used XML in their recent projects is 100 €, which corresponds to a daily rate of about 803 € based on an 8-hour working day.
Of the freelancers in Cologne, Germany who have used XML in their recent projects, 96% hold at least a Bachelor's degree, 65% hold at least a Master's degree, and 4% hold a doctorate.
On average, freelancers in Cologne, Germany who have used XML in their recent projects have 24 years of professional experience, with a single engagement typically lasting around 3.4 years.
The most common languages among freelancers in Cologne, Germany who have used XML in their recent projects are German (100%), English (94%), and French (24%).
The most common industries among freelancers in Cologne, Germany who have used XML in their recent projects are Information Technology (97%), Banking and Finance (62%), and Transportation (53%).
The most common business areas among freelancers in Cologne, Germany who have used XML in their recent projects are Information Technology (100%), Product Development (88%), and Quality Assurance (65%).
Main locations of FRATCH Experts, who have recently used XML
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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Dusseldorf 
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Essen 
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FRATCH CEO
