UML Experts in Cologne
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Meet FRATCH Experts in Cologne, who have recently used UML
Burhan Dinler
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
Rainer Langbehn
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
Hüseyin Altuntas
Last position:
Business Analyst at Niedersächsisches Ministerium für Inneres, Sport und Digitalisierung
- Responsibility, also as rollout manager, for the successful transition of a basic OZG platform into the client's standard operations by planning and implementing measures along Service Transition and Service Operation according to ITIL, including workshops in a SAFe environment with more than 40 operational stakeholders
- Building and maintaining cross-organizational stakeholder relationships by organizing and running various information sessions on technical configurations and user guides (platform and EfA services)
- Designing and improving various operational and project documents such as the ITIL operations manual, OLA, SLA, service support concept and rollout instructions
- Modeling project-based processes according to BPMN 2.0, EPK and UML related to OZG services with the goal of integrating them into the operational e-government process landscape (SOA)
- Coordinating operational stakeholders and KPI reporting to the project management team using agile methods according to SAFe
- Tech stack / tools: Microsoft 365 (SharePoint, OneNote, Outlook, Teams), Skype for Business, Cisco Webex, ADONIS, MindManager, Jira, Confluence
Jens Rehsack
Last position:
Technical Product Owner at App Development
Development of a mobile app to slow down the progression of dementia
Coordination of software development (TPO – Technical Product Owner)
agile requirements management (agile requirements engineering)
prioritization of tasks in consultation with stakeholders
stakeholder management
documentation and management of the software architecture
conducting PoC for technology decisions
Documentation as Code
docToolchain, arc42, req42, aim42, tpo42, C4 model, Archimate
ADR, Architecture Decision Records
Docker
Pre-Commit, Conventional Commits, Semantic Versioning
Liberating Structures, Agile Principles, Holacracy, Sociocracy 3.0
Mobile frameworks
AI developing interfaces, LLM
Cordova, Unity
Google Gemini, OpenAI, Character.AI
Prompt development
Stanislaus Stelle
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 Rautzenberg
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 Hagemeyer-Lee
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
Manuel Schneider
Last position:
Project Manager at Univention
Industry: digital sovereignty, public sector
Content:
- Project steering (teams: consulting, development, testing, deployment/operations)
Products and standards:
- Jira, Confluence, Asana, Miro, Mural
- Open Source, Keycloak, Open Xchange, ownCloud
René Karges
Last position:
Freelancer at Freelance work
- Business analysis
- Requirements management
- Project management
- Stakeholder management
- Team leadership
Vladimir Maznicenko
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
Louis Nguenkam
Last position:
Specialist in Adobe Experience Manager & Microservices at Nguenkam Consulting & Engineering
Java 11/21
Springboot
Swagger/OpenApi
Azure Pipelines
Trivy Integration
Apache Sling
OSGI
Java Content Repository (JCR)
Apache Jackrabbit Oak
Adobe HTL
GraphQL
Maven
GitLab
IntelliJ
Azure Cloud
Azure DevOps
Terraform
AEM specialist in the Scrum team
Development and deployment of microservices via Open API interfaces
Operation of microservices in the Azure Cloud
Implementation of AEM modules and integration with microservices
Member of the knowledge transfer team and a backend coordination team
Sebastian Thees
Last position:
Software Engineer / Cloud Engineer at OC Fulfillment GmbH
- Hybrid role as the first software engineer in the company to bootstrap the organization, laying out technical foundation and advising management on organizational aspects.
- Set up the SaaS platform architecture, selected languages and tools, and designed processes to deliver customer value quickly and reliably.
- Designed and implemented build and continuous deployment pipeline with multi-tenant approach enabling extreme scaling of the SaaS platform.
- Established initial ITSM and support processes, provided monitoring and alarming, and participated in the on-call team.
- Proposed new approaches to scale the platform and improve backend interfaces to mitigate bugs and communication overhead.
- Mentored new employees and served as a trustful team member and lateral leader.
- Conducted interviews for technical roles.
- Used technologies: Typescript, Node.js, Bash, Google Cloud Platform (App Engine, Cloud Run, Cloud Functions, Google Endpoints, Firebase), GitHub Actions, Docker, Terraform, MongoDB, Firebase, REST APIs, GraphQL.
Last position:
Rewe Digital
- Creation of Spring Boot integration tests
- Creation of JUnit tests for the coupon system
- Creation of component tests for Kafka topics
- Creation of CI/CD pipeline scripts
- Creation of UI tests with Playwright
- Creation of UI tests with Cypress
- Review of developer unit tests
- Planning the test architecture for integration tests
- Creation of the test automation concept
- Evaluation and creation of test reports
Kristian Carstensen
Last position:
Owner at CARSTENSEN MANAGEMENT GMBH
Allal Kharaz
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
Discover over 15,000 top freelancers
Statistics of experts using UML
Aggregated from the professional profiles of matched freelancers.
Experience
25 years (Germany: 24 years)
Position duration
2.1 years (Germany: 5.2 years)
Positions per freelancer
19 (Germany: 16)
Top business areas
Information Technology, Product Development, Quality Assurance
Top industries
Information Technology, Banking and Finance, Telecommunication
Certification focus areas
Information Technology, Project Management, Product Development
Bachelor's degree or higher
93% (Germany: 91%)
Master's degree or higher
73% (Germany: 64%)
Doctorate
20% (Germany: 9%)
Certifications per freelancer
5 (Germany: 4)
Most common languages
German, English, French
Speak two or more languages
100% (Germany: 97%)
Based on our profile pool as of 30 Aug 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 UML
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 30 Aug 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
About the technology
UML Basics
UML, the Unified Modeling Language, is a standard way to describe software and system structure. It helps teams make requirements, behavior, and architecture visible before code is written. Companies use it to reduce ambiguity and keep product, engineering, and stakeholders aligned.
Common Diagrams
- Class diagrams for objects, relationships, and domain models
- Sequence diagrams for interactions and message flow
- Use case diagrams for user goals and system scope
- Activity diagrams for workflows and decision paths
- State diagrams for lifecycle changes and transitions
Where It Helps
UML is useful in product design, integration work, legacy modernization, and technical documentation. It is also common when teams need to explain a complex system to business, QA, or external partners. In Cologne, it often supports collaboration across distributed teams and German-speaking stakeholders.
Tooling
Strong UML experts work with modeling tools and documentation habits that fit the team. They know how to keep diagrams simple, current, and useful instead of decorative. Typical environments include shared repositories, wiki pages, and tools that support versioned design work.
When to Bring in Help
- A project has unclear requirements or many interfaces
- Architecture needs to be explained to non-technical stakeholders
- Legacy systems need a clean model before change work starts
- Teams want consistent diagrams for documentation and reviews
- Delivery moves faster when a specialist shapes the model early
What Good Specialists Do
Good UML professionals choose the right diagram for the question, not the most complex one. They connect models to real system behavior and keep naming, scope, and dependencies precise. The best work reads clearly for both technical teams and management, and it stays useful after the first workshop.
Frequently asked questions
Not sure where to start with UML? These answers cover the essentials.
UML is used to describe software structure, behavior, and workflows in a clear visual form. Companies rely on it for requirements, architecture, integration design, and documentation that different teams can read the same way. It is especially helpful when a system is too complex for plain text alone.
Yes. UML stands for Unified Modeling Language, and both terms refer to the same standard. Searchers also use the phrase when they want class diagrams, sequence diagrams, or other model views for a software system.
UML is broader than BPMN because it covers both system structure and behavior, while BPMN focuses more on business process flow. Compared with plain documentation, UML gives teams a shared visual model that is easier to review and keep consistent across conversations. The right choice depends on whether the main need is software design or process mapping.
A strong UML specialist usually understands software architecture, requirements analysis, domain modeling, and technical writing. They should also be comfortable working with product owners, quality teams, and implementation specialists so the diagrams reflect real decisions. For larger systems, integration thinking and data flow knowledge matter too.
A UML freelancer works best when the project scope, main actors, key flows, and system boundaries are already known. They can help refine messy input, but they are most effective when they can talk to stakeholders and review existing material. If the system is highly regulated or highly complex, more domain context is needed early.
Yes, UML is often a good fit for remote collaboration because diagrams can be reviewed asynchronously. The key is to use clear naming, shared sources of truth, and short review cycles so models do not drift from the code or the requirements. In Cologne-based teams, remote work often pairs well with occasional on-site workshops.
Look for UML work that is easy to read, tied to real decisions, and tailored to the audience. Good specialists can explain why they chose a class, sequence, or activity view and what business or technical question it answers. Avoid diagrams that are overloaded, inconsistent, or disconnected from the actual system.
UML projects usually start with the diagram that answers the main question fastest. If you need to define scope, use case diagrams help; if you need to show behavior, sequence or activity diagrams are often better; if you need structure, class diagrams are the usual starting point. A good freelancer will recommend the right view instead of forcing one template.
The average hourly rate of freelancers in Cologne, Germany who have used UML in their recent projects is 108 €, which corresponds to a daily rate of about 868 € based on an 8-hour working day.
Of the freelancers in Cologne, Germany who have used UML in their recent projects, 93% hold at least a Bachelor's degree, 73% hold at least a Master's degree, and 20% hold a doctorate.
On average, freelancers in Cologne, Germany who have used UML in their recent projects have 25 years of professional experience, with a single engagement typically lasting around 2.1 years.
The most common languages among freelancers in Cologne, Germany who have used UML in their recent projects are German (100%), English (100%), and French (24%).
The most common industries among freelancers in Cologne, Germany who have used UML in their recent projects are Information Technology (100%), Banking and Finance (82%), and Telecommunication (65%).
The most common business areas among freelancers in Cologne, Germany who have used UML in their recent projects are Information Technology (94%), Product Development (76%), and Quality Assurance (76%).
Main locations of FRATCH Experts, who have recently used UML
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 
Dortmund 
Essen 
Nuremberg Request a free demo
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Philipp Thomaschewski
FRATCH CEO
