C# Experts in Düsseldorf
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Meet FRATCH Experts in Düsseldorf, who have recently used C#
Timo T.
Last position:
Gronic Ident & Sign at Gronic Systems GmbH
Gronic Ident & Sign
Core technologies: Android, Jetpack Compose, Retrofit, Regula Document Reader, Adobe Sign
Android app on dedicated devices for identifications and electronic signatures at the PoS
Youness R.
Last position:
Communication modernization and recipe management between S7-300, S7-1500 and WinCC V7 at Siemens AG
- Consulting and development of suitable communication concepts between S7-300 and S7-1500, taking the existing PROFIBUS infrastructure into account
- Technical support for connecting the S7-300 controllers to the existing recipe data block of the S7-1500
- Assisting in the development of the communication sequence for recipe access (read, write, acknowledge, status handling)
- Configuration of S7 communication (PUT/GET)
- Creation and adaptation of WinCC V7 scripts (C scripts and VBS scripts) for WinCC-based recipe management
- Development, optimization, and integration of recipe processes into the existing WinCC project structure
- Commissioning of the new communication interfaces and recommissioning of the recipe logic on existing systems
- Creation of technical documents: communication sequences, functional descriptions, commissioning documentation
Saruna M.
Last position:
Master's Thesis at Heinrich Heine Universität
- Title: Enhancing Syntactic Awareness in Transformer Language Models for Hindi Dependency Parsing
- Investigated syntactic knowledge captured by transformer language models (RoBERTa, XLM-RoBERTa) for Hindi dependency parsing, a morphologically rich and low-resource language.
- Developed structure-aware model variants (Struct_Roberta_hi, Struct_XLMR) by integrating a CNN-based parser network between transformer layers, inspired by the StructFormer architecture.
- Conducted extensive error analysis including label-wise, distance-based, direction-based, sentence length-based, and LVC/Non-LVC evaluations.
- Evaluated models on downstream NLP tasks (NER, POS tagging) using the IndicXTREME benchmark.
Thorsten L.
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
Olaf R.
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 F.
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.
Frank M.
Last position:
Plan & Code Automation UG
- Operations and rehabilitation
- During this time, development of:
- Websites zentivo-holding.com zyntra3d.com plancodeautomation.com
- Stock trading software
- Automated trading of all financial instruments listed on the stock exchange, with AI integration
- Project management software
- Automated project administration and project management with automated creation of material lists, electrical schematics, PLC programs, HMI programs, AI functions in control technology, project schedules and cost calculations, as well as quotation preparation and cost tracking.
- AI integration
- 3D printing management
- Various methods for creating 3D models from photos, videos or drawings.
- Creation of files suitable for 3D printing, 3D printer management via API.
- AI integration
Tools: Visual Studio, Codex and Cursor, HTML, Java, Python, PHP, C#, Python, SQL, Jason Script.
Andreas G.
Last position:
Senior Fullstack .NET (Core) & Angular Developer at IT Service Provider
- Supporting several agile teams in the new product development of an enterprise CRM and ERP application
- Web frontend development with Angular 17–21 (microfrontends, Domain-Driven Design, MDB-Bootstrap)
- Backend development with C# and .NET 7–10, MongoDB, MassTransit, RabbitMQ, Entity Framework Core, ElasticSearch (microservices, DDD)
- Technical feature design for assigned tasks
- Technical architecture design including forward-looking planning of AI-supported extension options
- Proof-of-concept implementation of AI-supported workflows with n8n and a locally hosted LLM (Ollama)
- Coordination with stakeholders and Product Owners, support with sprint planning
Result: Delivery of production-ready microservices and frontend modules in agile sprint cycles.
Environment: .NET 7–10 · Angular 17–21 · C# · TypeScript · OpenAPI · Microfrontends · DDD · Kubernetes · Docker · Helm · MS SQL Server · PostgreSQL · MongoDB · MassTransit · RabbitMQ · EF Core · ElasticSearch · Kibana · Azure DevOps · KeyCloak · n8n · Ollama
Daniel P.
Last position:
Freelance specialist in industrial automation technology at dPSolutions
- Self-employed PLC and software specialist focusing on automation and special-purpose machinery
- Programming, modernization, expansion and optimization of production systems, focusing on increased efficiency, 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)
- Integration of external systems such as reading devices, printers, scales, scanners and cameras, as well as various bus systems (Ethernet, Profinet, Profibus, EtherCAT, CAN bus, RS232, TCP/IP)
- Creation of visualizations and HMI applications with Siemens WinCC flexible, Beckhoff HMI and .NET frontends
- Planning, development and integration of machine vision solutions (Keyence, Cognex, AVS Alfavision, camera systems) in PLC and PC environments
- Design and implementation of process data collection 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
- Planning and programming of conveyor, inspection, assembly, packaging and grinding systems in industries such as automotive, chemical, food, electronics, machinery and systems engineering
- Conducting workshops and training on Siemens TIA Portal, STEP7 Classic, Beckhoff TwinCAT (including TwinSAFE), as well as topics such as 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 requirements analysis through planning, concept development and supplier coordination to commissioning, production support and customer support
Lutz E.
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
Younes H.
Last position:
Senior Backend Developer at PTA
- Development and maintenance of database-driven applications for managing supplier and food contracts, with extensive use of Oracle PL/SQL for complex business logic and data processing
- Optimization of PL/SQL procedures, functions, and triggers to ensure the performance and scalability of Oracle database solutions
- Ensuring compliance with best practices in PL/SQL development and implementing standards for code quality and data integrity
- Close collaboration with backend and frontend teams to ensure smooth integration between the Oracle database, C#-based APIs, and Azure cloud services
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
Khattab M.
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
Peter H.
Last position:
Product Owner / Senior Business Analyst
- Analysis of the possibility of transferring market location data to a separate microservice in an overarching web portal
- Development of a more user-friendly target process based on the current process in coordination with users
- Coordination of the related architecture concept with architects/developers
- Coordination of the related epics and user stories with the relevant business departments
- Backlog prioritization and project planning (including effort estimation)
- Testing and acceptance of implemented user stories
- Technologies/tools used: MS Office, Jira, Mural, Kotlin, React, GitHub, MS Azure, SQL, Postman, XML, JSON, Kafka, Balsamiq, BPMN
Jörg N.
Last position:
Senior Software Architect at Nieveler IT Consulting
- Redesign of the “Hessian Platform for Migration and Refugees”
- Technologies: C#, .NET 8.0, ASP.NET WebAPI, Blazor
- Architecture principles: Domain Driven Design, Mediator Pattern, Outbox Pattern, IOSP, Clean Code
- Methodologies: SCRUM, coaching, team lead
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
2.3 years (Germany: 2.9 years)
Positions per freelancer
18 (Germany: 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
74% (Germany: 88%)
Master's degree or higher
41% (Germany: 53%)
Certifications per freelancer
3
Most common languages
German, English, French
Speak two or more languages
97%
Based on our profile pool as of 9 Oct 2026.
Daily rate distribution
The chart shows how the daily rates of experts in this technology in Düsseldorf are distributed, based on recent contracts on our platform. Each bar covers a rate range — its height shows the share of experts charging within that range.
Average rates of experts in Düsseldorf 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 9 Oct 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 (84%)
- Manufacturing (63%)
- Banking and Finance (50%)
- Retail (44%)
- Professional Services (41%)
- Energy (38%)
- Government and Administration (38%)
- Telecommunication (38%)
Please note that freelancers can work across multiple industries, so percentages overlap.
About the technology
What C# is
C# is a strongly typed, object-oriented language from Microsoft. It runs mainly on the cross-platform .NET platform and is used for web applications, APIs, desktop software, cloud services, games and enterprise systems. Its tooling supports clear, maintainable code across large codebases.
Where it is used
C# fits products that need reliable business logic, secure integrations and long-term support.
- ASP.NET Core websites, REST APIs and backend services
- Windows applications with WPF or Windows Forms
- Cloud workloads, serverless functions and Azure services
- Games and interactive experiences with Unity
- Internal systems for finance, manufacturing and logistics
Ecosystem and tooling
The ecosystem includes .NET, ASP.NET Core, Entity Framework Core, LINQ and NuGet packages. Professionals commonly work with Visual Studio or JetBrains Rider, Git, automated tests, Docker, SQL databases and CI/CD pipelines. Azure is a frequent cloud environment, while AWS and Google Cloud are also supported.
When to bring in expertise
Companies often need freelance specialists during a new product build, a migration from older .NET Framework applications or a move from monoliths to services. Specialist support is also useful when a team must improve performance, strengthen security, connect external systems or release features without slowing existing delivery.
What strong professionals deliver
Strong C# professionals make sound choices about architecture, APIs, data access and deployment. They understand asynchronous programming, dependency injection, testing and observability, and can explain trade-offs clearly. In Düsseldorf, collaboration may combine remote delivery with on-site workshops, with German or English depending on the team.
How quality is assessed
Review experience with the relevant .NET version, application type and delivery environment rather than language knowledge alone. Look for readable code, practical test coverage, secure handling of data and evidence of successful integrations. A useful technical discussion should cover maintainability, deployment, monitoring and how the professional would reduce project risk.
Frequently asked questions
Questions about C#? Start with the answers below.
C# is commonly used for ASP.NET Core websites, REST APIs, enterprise applications, Windows desktop software and cloud services. It is also widely used with Unity for games and interactive applications.
C# and Java both suit structured backend and enterprise systems, with mature tooling and strong typing. TypeScript is often preferred for browser and full-stack JavaScript ecosystems, while C# offers especially close integration with .NET, Azure and Windows environments.
A strong C# specialist may also work with ASP.NET Core, Entity Framework Core, SQL, Docker, Git and cloud services. Experience with API design, automated testing, CI/CD and observability is valuable for production systems.
The right level depends on the system’s complexity, risk and delivery stage. For a simple API, practical experience with ASP.NET Core and testing may be enough; regulated, distributed or legacy systems call for deeper architecture and migration experience.
C# work is well suited to remote collaboration because source code, builds, tests and deployments can be managed online. For teams in Düsseldorf, remote delivery can be combined with on-site workshops, and the expected working language should be agreed before the engagement.
C# is often a strong choice when a company needs a typed, long-lived application with structured tooling, high concurrency or close .NET integration. Python may be more convenient for scripting, data exploration and rapid experiments, so the choice should follow the product’s runtime and maintenance needs.
Ask a C# professional to explain a comparable system, including architecture, testing, data access, security and deployment decisions. A code review or technical discussion should reveal whether they write maintainable code and handle trade-offs instead of relying on framework defaults.
C# specialists often support older .NET Framework applications as well as modern .NET systems. Useful experience includes dependency analysis, gradual migration, compatibility testing and keeping the existing application stable while new components are introduced.
The average hourly rate of freelancers in Dusseldorf, Germany who have used C# in their recent projects is 93 €, which corresponds to a daily rate of about 744 € based on an 8-hour working day.
Of the freelancers in Dusseldorf, Germany who have used C# in their recent projects, 74% hold at least a Bachelor's degree and 41% 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 2.3 years.
The most common languages among freelancers in Dusseldorf, Germany who have used C# in their recent projects are German (100%), English (97%), and French (19%).
The most common industries among freelancers in Dusseldorf, Germany who have used C# in their recent projects are Information Technology (84%), Manufacturing (63%), 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 (97%), Product Development (91%), 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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Dortmund 
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FRATCH CEO
