Domain-Driven Design Experts in Cologne
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Meet FRATCH Experts in Cologne, who have recently used Domain-Driven Design
Hooman Behmanesh
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.
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
Ayhan Gezer
Last position:
Senior QA Engineer / Test Automation Engineer / SDET at Rewe digital
Consulting, designing, and implementing the software testing lifecycle for multiple Android apps and backends Introducing test automation with Appium, SpringBootTest, RestAssured Setting up and managing emulators Developing an E2E library, an integration library, a Testcontainers library, and other libraries Developing, implementing, and advising on CI strategies Building the test environment with Testcontainers and virtualization Developing and implementing test cases for integration tests and end-to-end tests Establishing a maintainable test architecture with low entry barriers to simplify the creation of automated tests Some tools and technologies used: JUnit, RestAssured, Testcontainers, Kubedock, Appium, Android emulator, Jira Xray, Mockito, WireMock, Spring Framework, Kotlin
Jacqueline Haefke
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
Alexander Stier
Last position:
TYPO3 Senior Fullstack Developer, Backend & Frontend at Vergleich.de Gesellschaft für Verbraucherinformation mbH via HALIAN GmbH
- Typoscript
- Extbase
- Fluid
- Typescript
- requireJS
- WebVital
Jacqueline Krech
Last position:
OTTO
- Design, development, and monitoring of microservices
- Migrating functions from a monolithic system into separate microservices
- Designing and implementing new microservices (backend and frontend)
- Setting up and maintaining a CI/CD pipeline (GitHub Actions)
- Configuring cloud infrastructure with AWS CDK and Terraform
- Designing and implementing event-driven communication with AWS SNS/SQS and Apache Kafka
- Ensuring code quality through Test Driven Development (TDD), static code analysis, and Clean Code
Sara Schönherr
Last position:
Senior Software Developer with a Focus on UI/UX at vGen GmbH
Development of an interactive prototype for the concept of an AI-supported Enterprise Architecture Management tool. The goal was to present complex relationships between IT systems, business processes, and departments in a way that is easy to understand and to support decision-making in the context of IT transformations.
The prototype combined data-driven analyses with guided questions and interactive visualizations. A central part was the integration of a RAG process to provide domain-specific EAM knowledge in context. The focus was on quick idea validation, user-centered interaction design, and the technical feasibility of a scalable overall concept.
Design, implementation, and validation of a RAG process for domain-specific EAM knowledge with Python, LangChain, and graph/vector databases (Neo4J, Milvus)
Business and technical requirements analysis as well as definition of an MVP
Development of the architecture and technology concept using Angular, Spring Boot, GraphQL, and Kubernetes
Design of an interaction concept and creation of a brand style guide with Figma
Development of interactive prototypes with Angular, Konva.js, and TypeScript
Integration of CI/CD processes with GitLab CI/CD
Discover over 15,000 top freelancers
Statistics of experts using Domain-Driven Design
Aggregated from the professional profiles of matched freelancers.
Experience
19 years (Germany: 20 years)
Position duration
2.1 years (Germany: 1.9 years)
Positions per freelancer
12 (Germany: 15)
Top business areas
Information Technology, Product Development, Quality Assurance
Top industries
Information Technology, Banking and Finance, Media and Entertainment
Certification focus areas
Information Technology, Human Resources, Product Development
Bachelor's degree or higher
100% (Germany: 95%)
Master's degree or higher
100% (Germany: 54%)
Certifications per freelancer
3
Most common languages
German, English, Spanish
Speak two or more languages
100% (Germany: 98%)
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 Domain-Driven Design
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
What DDD Means
Domain-Driven Design, often called DDD, is a way to design software around the business domain instead of only around tables or technical layers. It helps teams name things clearly, separate responsibilities, and keep core rules visible in the codebase.
What It Covers
- Bounded contexts and context mapping
- Aggregates, entities, value objects, and domain events
- Ubiquitous language for business and specialists
- Strategic design for services, modules, and integrations
These ideas are useful in products with changing rules, many teams, or several systems that must stay aligned.
Where It Fits
DDD is common in business software, insurance, logistics, e-commerce, and internal platforms with complex workflows. In Cologne, it often supports teams that need close product and domain collaboration while working with German-speaking stakeholders and distributed experts.
When To Hire
Companies usually bring in freelance DDD professionals when a system has grown hard to change, the domain model no longer matches real business needs, or new services must be split from a larger codebase. They also help during redesigns, domain workshops, and recovery work after unclear architecture decisions.
Strong Expertise
A strong DDD specialist can turn domain discussions into clear models that engineers, product owners, and business experts can all use. Look for people who can:
- challenge vague terms and define a shared language
- spot natural boundaries between contexts
- connect architecture choices to business rules
- work with event-driven systems, CQRS, and testing around domain behavior
Ecosystem And Practice
DDD is not tied to one tool or framework. It is often applied with Java, .NET, Kotlin, or TypeScript systems, plus messaging, persistence, and testing tools that support the model. The best experts keep the focus on the domain first, then choose the simplest design that holds up as the software grows.
Frequently asked questions
Need clarity? These are the questions we hear most often about Domain-Driven Design.
Domain-Driven Design is used to build software around complex business rules, not just technical layers. Teams use it when the language of the business matters and when different parts of the system need clear boundaries. It is common in products where rules change often and the code must stay understandable.
DDD focuses on the domain model and the relationships inside the business problem, while layered architecture mainly organizes code by technical responsibility. A layered system can still use DDD ideas, but DDD adds concepts like bounded contexts, aggregates, and a shared language. That makes it better for systems with real business complexity.
Domain-Driven Design is not only for large systems, but it pays off most when the business logic is hard to keep in your head. Small systems with simple CRUD flows often do not need the full approach. The right choice depends on how much domain knowledge the team must preserve.
A strong Domain-Driven Design specialist should understand business analysis, modeling, communication, and code structure. Useful adjacent skills include event-driven design, testing, persistence mapping, and service decomposition. They should also be able to work with product and domain experts without hiding behind jargon.
Bring in DDD expertise when the domain model is unclear, teams disagree on terminology, or one system has become too mixed up to change safely. Freelancers are also useful for workshops, context mapping, and helping teams redesign a problematic core. They can add focus without forcing a long internal ramp-up.
Domain-Driven Design is a design approach, not a deployment style like microservices or an integration style like event-driven architecture. It often helps define good service boundaries and business events, but it does not require either one. In practice, DDD can guide both microservices and monoliths.
Yes. Domain-Driven Design depends on clear language and good workshop habits, so remote sessions can work well if the team prepares properly. For Cologne-based companies, a mix of remote collaboration and on-site domain workshops can be effective, especially when many stakeholders need to agree on terms.
A good Domain-Driven Design expert asks sharp questions, exposes hidden assumptions, and turns messy business talk into a model people trust. Look for examples of bounded contexts, domain events, and decisions tied to real business constraints. Strong work should make the system easier to change, not just more complicated.
The average hourly rate of freelancers in Cologne, Germany who have used Domain-Driven Design in their recent projects is 98 €, which corresponds to a daily rate of about 785 € based on an 8-hour working day.
Of the freelancers in Cologne, Germany who have used Domain-Driven Design in their recent projects, 100% hold at least a Bachelor's degree and 100% hold at least a Master's degree.
On average, freelancers in Cologne, Germany who have used Domain-Driven Design in their recent projects have 19 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 Domain-Driven Design in their recent projects are German (100%), English (100%), and Spanish (14%).
The most common industries among freelancers in Cologne, Germany who have used Domain-Driven Design in their recent projects are Information Technology (86%), Banking and Finance (43%), and Media and Entertainment (43%).
The most common business areas among freelancers in Cologne, Germany who have used Domain-Driven Design in their recent projects are Information Technology (100%), Product Development (100%), and Quality Assurance (86%).
Main locations of FRATCH Experts, who have recently used Domain-Driven Design
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 
Dusseldorf 
Nuremberg Request a free demo
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Philipp Thomaschewski
FRATCH CEO
