C# Experts in Cologne
matched in minutes from over 15,000 CVs with the power of AIHire experts who deliver .NET web services, Windows applications, cloud backends and Unity projects with C#, while connecting APIs, databases and deployment pipelines. FRATCH finds precise matches with vetted, available freelancers quickly.
Meet FRATCH Experts in Cologne, who have recently used C#
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
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
Nenad B.
Last position:
Safety Video Analytics Project for Airbus at Airbus
- Developed a real-time video analytics proof-of-concept for deployment on NVIDIA Jetson edge devices.
- Implemented DeepStream pipelines including object detection, tracking, human pose estimation, face anonymization, and zone intrusion detection.
- Built a Qt/Python demonstration UI interfacing with the AI pipeline via REST APIs.
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
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
Ahmed M.
Last position:
Senior Full-Stack Engineer at NEW NETZ
- Built more than 15 frontend applications and more than 10 backend services across internal tools, back-office workflows, and external portals for installers and end customers
- Automate build and release workflows with TypeScript and Azure DevOps
- Mentor junior engineers through code reviews and technical guidance
- Integrate AI-assisted and agentic development practices into engineering workflows
- Coordinate user experience decisions with UX designers
Tech Stack: Claude Code, Codex, AWS (S3, Lambda, AppSync, Resolver), Next.js App Router, ReactJS, NuxtJS, Vue.js, Storybook, JavaScript, TypeScript, GraphQL, Azure DevOps
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
Melanie T.
Last position:
Founder and Game Director at MELLOW Games UG (haftungsbeschränkt)
I won the "serious games funding" from the state of NRW in Germany at the end of 2023 for my game Blueberry. This gave me the chance to put together an international team of freelancers for programming, art, animation and audio. I developed the complete UI and UX as well as level and narrative design for the game, implementing the UI in Unity in close collaboration with my programmer. Blueberry will be released on Steam, Xbox, PS5 and Switch on 28th May 2026.
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.
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
Rodion O.
Last position:
Founder, CTO & Managing Director at MYNR Product Mining GmbH
- Responsible for the architecture and development of an AI-native SaaS platform for industrial product portfolio management.
- Designed the modern data platform architecture on Azure for scalable analytics and enterprise data integration.
- Built enterprise data ingestion and transformation pipelines across complex industrial system landscapes.
- Developed graph-based representations of product structures and dependencies for analytical reasoning.
- Designed and implemented an agentic AI framework for AI-supported decision workflows.
- Built scalable analytical microservices and integrated reporting through modern BI technologies.
- Coordinated backend, AI, and frontend development across the MYNR platform stack.
Ayhan G.
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
Brahim A.
Last position:
Lead Developer at Blazor Web App at WAITS Software- und Prozessberatungsgesellschaft mbH
- Web development with Blazor
- Two-factor authentication for Blazor applications
- Uploading and downloading files
- Bug fixes for existing applications
- Programming interfaces
- Integration of third-party tools and technologies
- Creation of developer tests (unit tests)
Andreas E.
Last position:
Consultant at Iteratec GmbH
Kai B.
Last position:
Freelance CPQ Consultant (Full-Time) at Freelance CPQ Consultant
- Independent CPQ consulting for a portfolio of industrial manufacturers, including Scheidt & Bachmann, Trützschler Group SE, and Weiss Klimatechnik GmbH (Schunk Group)
- Full project coverage: requirements analysis, concept, system design, implementation, testing, and international go-live support
- Deep integration work with SAP ECC (material master replication, SD document creation, material creation, general APICONNECT and other web service interfaces)
- Process consulting: analysis and optimization of internal quoting processes for sales and management
- Knowledge transfer/coaching and pair programming to strengthen internal team skills
Discover over 15,000 top freelancers
Statistics of experts using C#
Aggregated from the professional profiles of matched freelancers.
Experience
21 years (Germany: 20 years)
Position duration
2.9 years
Positions per freelancer
14
Top business areas
Information Technology, Product Development, Quality Assurance
Top industries
Information Technology, Government and Administration, Banking and Finance
Certification focus areas
Project Management, Information Technology, Product Development
Bachelor's degree or higher
95% (Germany: 88%)
Master's degree or higher
77% (Germany: 54%)
Doctorate
5% (Germany: 9%)
Certifications per freelancer
3
Most common languages
German, English, French
Speak two or more languages
100% (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 C#
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.
C# 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 (100%)
- Government and Administration (52%)
- Banking and Finance (44%)
- Transportation (44%)
- Manufacturing (44%)
- Automotive (37%)
- Healthcare (30%)
- Professional Services (30%)
Please note that freelancers can work across multiple industries, so percentages overlap.
About the technology
C# at a glance
C# is a strongly typed, object-oriented language from Microsoft. It runs mainly on the .NET platform and supports web services, desktop software, cloud systems, games and internal business applications. Its tooling combines mature libraries with modern language features.
What it builds
C# specialists create applications that need clear domain logic, reliable integration and long-term maintainability.
- ASP.NET Core websites, REST APIs and backend services
- Windows applications with WPF or Windows Forms
- Cloud workloads, background services and event-driven systems
- Unity games, simulations and interactive 3D experiences
Ecosystem and tooling
The ecosystem includes .NET, ASP.NET Core, Entity Framework Core, NuGet and Visual Studio. Strong professionals also work with SQL databases, Docker, Azure or other cloud services, automated testing and continuous delivery. They choose libraries carefully and keep dependencies maintainable.
When companies need support
Freelance expertise helps when a team is modernising a .NET Framework application, splitting a monolith, extending an API or preparing a C# product for cloud deployment. It is also useful for stabilising legacy code, improving test coverage or connecting software to enterprise systems. In Cologne, remote collaboration can cover much of the work, while local professionals can support workshops and on-site coordination in German or English.
Signs of strong expertise
Quality is visible in technical decisions and delivered software, not in familiarity with syntax alone.
- Clear separation of domain, application and infrastructure concerns
- Secure API design, validation and dependable error handling
- Effective unit, integration and end-to-end testing
- Practical database modelling and performance awareness
- Documented deployment, monitoring and operational handover
Selecting the right specialist
Review projects that resemble the system, users and delivery stage you have in mind. Ask how the professional would approach architecture, testing, releases and technical debt in your context. For a new product, product thinking and rapid feedback matter; for a regulated or established system, traceability, compatibility and careful rollout may matter more.
Frequently asked questions
Need clarity? These are the questions we hear most often about C#.
C# is used for ASP.NET Core web applications, REST APIs, Windows software, cloud services and Unity games. It is also common in enterprise systems that need structured business logic, database access and integration with other services.
C# and Java both support object-oriented, strongly typed application development and large enterprise ecosystems. C# is closely integrated with .NET, Visual Studio and Microsoft services, while Java offers a broad JVM ecosystem and strong portability across many environments.
A strong C# specialist often works with .NET, ASP.NET Core, Entity Framework Core, SQL, REST, Docker and cloud services. Depending on the project, knowledge of Azure, message brokers, frontend frameworks, DevOps practices or Unity can also be important.
The right level depends on the system rather than on a fixed number of years. A small API may need solid C# and testing skills, while a legacy migration or distributed platform calls for experience with architecture, production operations and safe releases.
Yes. C# work is well suited to remote collaboration through source control, issue tracking, code reviews and shared development environments. Teams in Cologne should agree on working hours, documentation and whether German or English is used for technical and business communication.
C# is a strong choice when a company needs a structured backend, mature tooling, reliable typing or close integration with Microsoft services. Python may be preferable for data-heavy experimentation, while JavaScript or TypeScript can be central when the main requirement is full-stack web development.
Ask for examples of delivered systems and discuss the decisions behind their design. A capable C# freelancer should explain testing, dependency management, security, database behaviour, observability and deployment in terms that fit your product and operational constraints.
Yes. C# with modern .NET and ASP.NET Core supports containerised services, serverless workloads, APIs and event-driven applications. Its value depends on fit: teams should assess runtime requirements, existing skills, hosting choices and the ecosystem needed for the product.
The average hourly rate of freelancers in Cologne, Germany who have used C# in their recent projects is 91 €, which corresponds to a daily rate of about 729 € based on an 8-hour working day.
Of the freelancers in Cologne, Germany who have used C# in their recent projects, 95% hold at least a Bachelor's degree, 77% hold at least a Master's degree, and 5% hold a doctorate.
On average, freelancers in Cologne, Germany who have used C# in their recent projects have 21 years of professional experience, with a single engagement typically lasting around 2.9 years.
The most common languages among freelancers in Cologne, Germany who have used C# in their recent projects are German (100%), English (100%), and French (15%).
The most common industries among freelancers in Cologne, Germany who have used C# in their recent projects are Information Technology (100%), Government and Administration (52%), and Banking and Finance (44%).
The most common business areas among freelancers in Cologne, Germany who have used C# in their recent projects are Information Technology (100%), Product Development (100%), and Quality Assurance (67%).
Main locations of FRATCH Experts, who have recently used C#
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
