C# Experts in Dusseldorf
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Meet FRATCH Experts in Dusseldorf, who have recently used C#
Olaf Radicke
Last position:
DevOps Architect / Consultant at Authority with increased security requirements
- Identification of requirements (legal, organizational, and technical)
- Design of solution architectures
- Evaluation of concepts and technologies
- Preparation of decision templates
- Architectural Decision Records (ADR)
- Coordination of implementation
- Review of implementations
- Documentation
Klajdo Fyraj
Last position:
Independent Product Developer / Software Architect at rastr.eu
- Architected and deployed a live B2B geocoding and demographic-data platform for Germany, combining address lookup with census-based population statistics through a web application and REST API.
Thorsten Lenzen
Last position:
Senior Security Analyst
- Analysis and remediation of security vulnerabilities in a risk assessment system for energy trading
- System analysis
- Threat modeling
- Decision-making on vulnerability mitigation strategies
- Implementation of vulnerability detection mechanisms
- Security scans
- DevSecOps practices
- Technical environment: Visual Studio Code, JetBrains Suite, MS Threat Modeling Tool, DevSecOps, Git, AWS, DynamoDB, SQL Server, Endur, Snowflake, Orca
- Languages: C#, JavaScript, TypeScript, Python, PowerShell, Bash, Terraform, SQL
Lutz Engelland
Last position:
Freelance Software Developer – GoPro MultiCam Control via COHN at Plutos Company UG
- Development of a pilot system to control and monitor multiple GoPro cameras
- Implementation of start, stop, status, media, download, and diagnostic functions via COHN endpoints
- Realization of camera detection, single and group control, as well as stable session/keep-alive logic
- Setup of a download pipeline with queue, retry handling, and temporary files
- Consistent session, folder, and file naming for multi-camera recordings
- Integration of provisioning, certificates, and network operations
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
Khattab Mennat
Last position:
Software Tester at Atlas Elektronik GmbH
- Deriving test cases in IBM DOORS for various devices according to ISTQB
- Automating and running test cases in Python under Linux
- MobaXtrem, Windchill are in use
Daniel Ubani
Last position:
Senior Application Packaging & Deployment Engineer at Allevio AG (Client: Allianz Technology)
- Enterprise application packaging and deployment for Allianz's global Windows migration programs across Europe, North America, and APAC
- Migrated hundreds of enterprise applications from Windows 10 VDI to Microsoft Azure Windows 365 (Windows 11)
- Created software packages in MSI/MST, FlexApp, PSADT 3/4, and App-V according to enterprise packaging standards
- Developed an ASP.NET packaging automation platform with MongoDB, SQL Server, SharePoint, and Outlook integration
- Built PowerShell modules for automated quality checks of MSI and FlexApp packages
- Developed a release conflict detection module in PowerShell to identify potential deployment issues before production
- Created WDAC monitoring scripts for automated policy oversight and incident response
- Implemented MSGraph API calls in PowerShell for Azure AD and Intune operations
- Created Citrix oData scripts for historical usage analysis (BYOD, VDI, fat clients)
- Developed an Intune Win32 app 'Do Not Disturb' deployment routine for an optimal user experience
- First point of contact for troubleshooting production incidents with packaged applications
- Coordinated application owner, UAT, and release testing for hundreds of deployments
- Administered Microsoft Intune, Citrix environments, and SQL Server security
- Created and tested WDAC policies in Intune; managed configuration policies and Win32 app deployments
- Primary packaging resource for Allianz France since 2019
Alois Gruber
Last position:
Bank DZ Privatbank S.A.
- Various programming tasks as specified
- Work carried out from home office, meetings/tasks via email, phone and Microsoft Teams
- Version control via GIT
- Implementation with RDI, FreeSQL SQL
- Extension of automatic test environment creation as specified - adding automatic transfer of existing iSeries users and preparation as well as anonymization of test data
- Creation of trigger and service programs in SQLRPGLE, FreeRPG, ILE RPG and CLLE
- Development and implementation of the CallKredite project including additional extensions for other departments
- Conversion of RPG to Free-RPG and SQL as well as extension of existing modules as specified
- Migration to a new banking release
- Support for specialist segment / OIV
Kaliyan Muthukrishnan
Last position:
Techno-Functional Consultant – Digital Lab & Manufacturing Systems at Dynavax Technologies
- Led SampleManager LIMS 21.x & LabWare LIMS v8 implementation, reducing manual lab errors by 40% and improving data traceability.
- Configured LW LIMS & SM LIMS 21.2: workflow design, role-based access control (RBAC), and master data management.
- Designed and configured LES workflows: sample lifecycle management, test assignments, approvals, and result review processes.
- Managed Master Menu and CI configuration, ensuring consistency, data integrity, and regulatory compliance.
- Integrated LIMS 21.2 with MES, ERP, EM, WinKQCL (Lonza MODA), SoftMax Pro, Empower, and Chromeleon CDS via REST APIs and web services.
- Implemented PAS-X MES: architecture design, multi-platform implementation (PAS-X, Siemens Opcenter), and integration with PLC, SCADA, and DCS systems.
- Executed IQ/OQ/PQ qualification protocols and Validation Summary Reports (VSR) for QC analytical and utility systems in aseptic and sterile production environments.
- Developed and reviewed Risk Assessments, Traceability Matrices, and Data Integrity evaluations in accordance with ALCOA+, 21 CFR Part 11, and EU Annex 11.
- Led EMA/FDA/WHO inspection readiness, standardized CQV SOPs, enabled digital CQV integration (LIMS/CDS/MES/SCADA/ERP/SDMS), and ensured 21 CFR Part 11 & Annex 11 compliance.
- Managed secure OT cybersecurity: network configuration and access control.
- Configured NuGenesis SDMS for document/data management, CDS/LIMS integration, workflow automation, and reporting.
Daniel Pohl
Last position:
Freelancer in industrial automation engineering at dPSolutions
- Independent work as a PLC and software specialist focusing on automation and custom machinery
- Programming, modernization, expansion and optimization of production plants with focus on efficiency improvements, data transparency and system integration
- PLC programming and safety with Siemens S7 Classic/TIA-Portal, Beckhoff TwinCAT 2/3 and CoDeSys
- Development of high-level language software and database applications (.NET / C#, C++, Visual Basic .NET, Borland/Embarcadero C++)
- Development of custom software solutions for industrial automation, including embedded systems (Raspberry Pi, Arduino, NodeMCU, ESP8266)
- System integration of external systems such as readers, printers, scales, scanners and cameras, as well as various fieldbus systems (Ethernet, Profinet, Profibus, EtherCAT, CAN bus, RS232, TCP/IP)
- Creation of visualizations and HMI applications with Siemens WinCC flexible, Beckhoff HMI and .NET front-ends
- Design, development and integration of machine vision solutions (Keyence, Cognex, AVS Alfavision, camera systems) in PLC and PC environments
- Design and implementation of process data acquisition systems and traceability solutions (100% traceability) based on Microsoft SQL Server (Compact, Express, Server) including stored procedures and direct PLC-SQL communication
- Creation of software and PLC concepts, standard function blocks and project libraries for PLC and high-level language projects
- Design and programming of conveyor, testing, assembly, packaging and grinding systems in industries such as automotive, chemical, food, electronics and machinery and plant engineering
- Conducting workshops and training on Siemens TIA-Portal, STEP7 Classic, Beckhoff TwinCAT (including TwinSAFE) as well as topics like architectures, safety, database integration and documentation
- Creation of technical documentation, manuals, training materials and class documentation with Microsoft Office and Doxygen
- Project management tasks from requirement analysis through planning, concept development and supplier coordination to commissioning, production support and maintenance
Esmail Saberi
Last position:
Senior Load and Performance Tester at Deutsche Bahn (DB-Netz)
- Design, development, and execution of load and performance tests for the PRISMA project
- Use of Apache Jmeter, Gatling, Apache ActiveMQ, Jms/Tibco Ems, SikuliX, Jython, Amazon AWS, PAN-Client
- Methods: load tests, test automation
Jan G.
Last position:
Master Data Application at confidential
Visualization, search, and maintenance of various types of master data, providing them via a REST API, and implementing a variety of import and export formats.
Implementation, architecture, project management.
Technologies and tools: Angular (Signals, Signal Store, swagger-codegen, standalone components), Java, PostgreSQL, ActiveMQ, JavaScript, Spring Boot (Spring Core, Spring MVC, Spring Data/JPA via Hibernate, Spring Security, Spring Modulith), JUnit, Flyway, QueryDSL, GraphQL, REST API, Node, npm, Maven, SonarQube, GitLab CI/CD pipelines, Docker, Nexus, OpenAPI + Swagger UI, Keycloak, OAuth2, OpenID Connect, IntelliJ IDEA, Jira, Confluence.
Sebastian Chece
Last position:
Public institution responsible for educational institutions in NRW
- Consulting on processes and execution of load tests, performance tests and technical tests of various applications: web portal, file cloud, email, video conferencing, learning/course platform
- Creating the load test framework
- Programming test scripts (JMeter, Selenium)
- Developing batches to support the evaluation
- Executing load tests and evaluating results, including clear reporting, recommendations for action, and bottleneck analysis
- Managing tasks and collaboration to achieve meaningful load test results
Anouar Taoussi
Last position:
Fullstack Developer Java/Spring Boot at Snipes SE (Deichmann Group)
- Migration of a .NET Core loyalty program for Snipes, used by mobile cash registers in Snipes stores
- Part of the customer’s digitalization strategy in an agile, cross-functional team with a high level of ownership
- Connecting interfaces to third-party systems (e.g. Brandung, CDS)
- Quality assurance through automated tests
- Carrying out developer, unit, and integration tests
- Patterns & methods used: Clean Code, microservice architecture, agile development with SCRUM
- Technologies & tools used: Spring Boot, Java 23, Java Persistence API (JPA), Azure DevOps, Azure Key Vault, Azure PostgreSQL, Docker & Kubernetes, Git, Graylog, Grafana, JUnit, SonarQube, Jira, Confluence, Prometheus, GitLab, GitLab CI/CD, Visual Studio Code
Rachid Raji
Last position:
Self-employed at R&A Engineering GmbH
- Development and programming of PLC controllers and servo drives, such as TIA Portal, Siemens Step7 Classic, RSlogix/Studio5000, Unity Pro and CODESYS
- Visualization systems WinCC, FactoryTalk VIEW
- Integration of various fieldbuses into automation devices (PROFIBUS, PROFINET, DeviceNet, ControlNet, Ethernet/IP, MODBUS)
- Script programming (C# / VB.Net / VBscript / VBA)
- Selection of electrical components and systems
- Commissioning and optimization of simple to complex plants and machines
- Planning and creation of electrical schematics
- Preparation of installation plans
- Preparation of bills of materials and technical calculations
- Feasibility studies
Discover over 15,000 top freelancers
Statistics of experts using C#
Aggregated from the professional profiles of matched freelancers.
Experience
22 years (Germany: 20 years)
Position duration
2.4 years (Germany: 2.9 years)
Positions per freelancer
14
Top business areas
Information Technology, Product Development, Project Management
Top industries
Information Technology, Manufacturing, Banking and Finance
Certification focus areas
Information Technology, Project Management, Product Development
Bachelor's degree or higher
71% (Germany: 88%)
Master's degree or higher
38% (Germany: 54%)
Certifications per freelancer
3
Most common languages
German, English, French
Speak two or more languages
96% (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 Dusseldorf 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 Dusseldorf 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 30 Aug 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
About the technology
C# at a glance
C# is a general-purpose language for business software, web APIs, desktop apps, cloud services, and game tools. It is most often used with the .NET ecosystem and fits teams that need clean structure, strong tooling, and reliable long-term maintenance.
What teams build
- ASP.NET Core APIs and web back ends
- Blazor and MVC web applications
- Windows apps and internal business tools
- Azure services, workers, and integrations
- Unity-based features and supporting tools
Ecosystem and stack
Strong C# specialists work across .NET, ASP.NET Core, Entity Framework Core, LINQ, and NuGet packages. They also know how to use Visual Studio, Rider, test frameworks, logging, dependency injection, and CI pipelines without adding complexity.
When to bring in freelancers
Companies bring in freelance C# experts when a product needs a new service, a legacy .NET codebase needs cleanup, or a team is short on specialist capacity. In Dusseldorf, this often comes up for enterprise software, logistics, finance, retail, and industrial systems that need stable integrations.
What strong experts deliver
Good professionals write code that is easy to review, test, and extend. They handle API design, async programming, data access, authentication, error handling, and performance issues with care.
They also document decisions clearly and work well with product, backend, and cloud teams, whether the project is remote or on site.
How to judge fit
A strong C# specialist can explain trade-offs in .NET versions, show practical experience with production services, and spot weak points in architecture before they become problems. Look for clear thinking, solid testing habits, and recent work in the same type of system you need.
Frequently asked questions
Questions about C#? Start with the answers below.
C# is used for business applications, APIs, cloud services, desktop software, and tooling inside the .NET ecosystem. It is a common choice when a company wants maintainable code, strong type safety, and a broad set of libraries for web, data, and integration work.
Bring in a C# freelancer when the team needs extra capacity, a specific .NET skill set, or help with a legacy system. It also makes sense for short projects such as API builds, migrations, code reviews, or performance fixes where a full-time hire would be slow to justify.
C# is often compared with Java for server-side systems and with JavaScript for web work, but it usually wins when a team wants tight integration with the .NET stack. Compared with JavaScript, it is better suited to strongly typed back-end code and larger application structure; compared with Java, it often feels more integrated in Microsoft-centered environments.
A strong C# professional usually knows ASP.NET Core, Entity Framework Core, SQL, REST APIs, testing tools, and cloud basics such as Azure. For many projects, knowledge of authentication, messaging, logging, and clean architecture matters just as much as the language itself.
For a small API or a focused internal tool, one strong C# specialist may be enough. Larger systems need someone who can handle architecture, data access, deployment, and code quality across the full .NET stack, especially when older code must be stabilized.
C# work is usually very remote-friendly because most of the value comes from code, tests, and clear technical decisions. On-site time can still help when a team is modernizing a large .NET system, aligning with stakeholders, or working through complex domain rules in Dusseldorf.
Look for a C# specialist who writes readable code, tests important paths, and can explain why they chose a certain approach. Strong signals include production experience with .NET, careful handling of async code and data access, and a habit of improving the system instead of only adding features.
Yes, C# remains a strong choice for new software when a project needs reliable backend logic, modern tooling, and a mature ecosystem. It is especially practical for companies already using .NET, Azure, or Microsoft-based infrastructure, but it also works well for greenfield applications that need structure from the start.
The average hourly rate of freelancers in Dusseldorf, Germany who have used C# in their recent projects is 97 €, which corresponds to a daily rate of about 772 € based on an 8-hour working day.
Of the freelancers in Dusseldorf, Germany who have used C# in their recent projects, 71% hold at least a Bachelor's degree and 38% hold at least a Master's degree.
On average, freelancers in Dusseldorf, Germany who have used C# in their recent projects have 22 years of professional experience, with a single engagement typically lasting around 2.4 years.
The most common languages among freelancers in Dusseldorf, Germany who have used C# in their recent projects are German (100%), English (96%), and French (18%).
The most common industries among freelancers in Dusseldorf, Germany who have used C# in their recent projects are Information Technology (86%), Manufacturing (64%), and Banking and Finance (50%).
The most common business areas among freelancers in Dusseldorf, Germany who have used C# in their recent projects are Information Technology (96%), Product Development (89%), and Project Management (75%).
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.
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Frankfurt 
Stuttgart 
Dortmund 
Essen 
Nuremberg Request a free demo
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Philipp Thomaschewski
FRATCH CEO
