C Experts in Dusseldorf
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Meet FRATCH Experts in Dusseldorf, who have recently used C
Rudolf E.
Last position:
Datacenter Engineer, Network & Security Administrator at International Insurance Group
Operation and further development of the network and security infrastructure.
Monitoring, analysis and resolution of network and security incidents.
Cross-departmental collaboration with other teams on operations and further development, and reporting.
Firewall vulnerability analysis.
Firewall access requests.
Troubleshooting IP communication issues on network and firewall infrastructure.
Security-critical IT infrastructure, processing of personal data, compliance with legal requirements.
Products: Palo Alto Networks Firewalls, Cisco ACI, Checkpoint Firewalls, F5
Technologies: SDN, SDWAN, Cisco EPIC, Cisco ACI
Achim R.
Last position:
Project and Program Manager, PMO Lead at Freelancer / Interim Manager
Successful delivery of projects on behalf of customers:
-> 2023 – present: Project management for the consolidation of sites/data centers for a large telecommunications provider (infrastructure project, customer: Telefonica)
Opening and preparing new sites
Application migrations
Decommissioning and handover of old sites
-> 2021 – 2022: IT multi-project management for a large car leasing company (customer: Athlon)
Migration of applications to the cloud and to another data center
Additional projects to expand and optimize the application landscape
-> 2021: Project management for the development of a platform providing internet access on aircraft operated by various airlines (customer: m3Connect/German Telekom)
-> 2017-2020: Responsible management of an IP network consolidation (infrastructure project, customer: Cisco/Vodafone) at a large telecommunications provider
Planning and coordination of migrations and their rollout
Team leadership and integration of different teams (network operators, hardware and service providers)
René S.
Last position:
Self-employed Interim Manager and Project Consultant at Energy utility company
- Analysis of the existing water price calculation for formal errors and gaps in the factual arguments with regard to the legal and regulatory framework (including AVBWasserV, KAG RP, statutes, NEV pursuant to BGH) and best practices in the water industry
- Operational assurance of controlling for the water division
- Regulatory optimization of the existing pricing strategy
- Factual assessment of existing legal proceedings in the water sector
- Professional support for all stakeholders in the water division
- Implementation and roll-out of a new water price calculation tool
- Knowledge transfer to the controlling department and professional training of new employees
- Bridging a vacancy by carrying out the water price calculation
- Review of the pricing strategy from a regulatory perspective
- Establishment of a PMO and assumption of PMO tasks
- Professional advice on preparing the annual financial statements
- Professional sparring for the Executive Board, Legal and Finance/Controlling in the water sector
- Optimization, adjustment and redesign of business processes in the Finance/Controlling environment
- Regulatory adjustments to the existing controlling system
- Advising the Executive Board of the holding company and working with subsidiaries
- Support with impairments together with the auditor
- Opportunity and risk analyses for existing legal proceedings and negotiations
- Drafting of price adjustment clauses and participation in arbitration proceedings
- Reorganization of investment structures
- Reporting to the Head of Legal, Head of Corporate Development, as well as CEO and CSO
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.
Andreas W.
Last position:
Freelancer at Infrafibre Networks GmbH
- Determining the current status (planning status / expansion status) of the so-called interpolygon routes
- Preparing an end-to-end project plan for the individual routes, taking active and passive components and activities into account
- Monitoring and controlling plan implementation
- Optimizing the selected network architecture
- Creating network and splice plans
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
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
Kacper K.
Last position:
Author
Seqnaut and Sycosm (WIP) – Embedded Audio DSP & Synthesis Platform
- Embedded audio DSP framework — synthesizers, effects, drum machines; modular audio graph
- Sequencing: PianoRoll, StepGrid, MasterClock; 8-voice polyphonic synth; CLI + OSC
- Transient Detector — dual-envelope adaptive threshold, guitar attack detection
- Hardware: Teensy 4.1, custom AFE design tapping BOSS GX-100; MIDI FX integration
Label: C++23, C, Python, CMake, FreeRTOS, Teensy 4.1 (ARM Cortex-M7), Teensy Audio (Stoffregen), DaisySP, I2S/SAI, OSC, MIDI
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
Stanislaus S.
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
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
Bernhard D.
Last position:
Enterprise Architect. And responsible for the cross-functional architecture as well as all domains with a focus on the sales at Süddeutsche Krankenversicherung
Creation of business and technical concepts as well as support for enterprise architecture management as part of the migration to the Adesso standard insurance solutions and the renewal of surrounding systems
Interface definitions
Business analysis and creation of the business concepts for input management and sales
Creation of architecture guidelines and processes
Processing technical and business decisions in the architecture board
Definition of service processes and system management aspects
Creation of the technical target operating model
Creation of an integration architecture for AI/LLMs from the providers Commasoft and Insiders
CommaSoft (Alan) webpages and web services
Insiders for Smartfix based on web services
Creation of a question catalog for a security/regulatory check.
Analysis of threats using threat modeling / STRIDE incl. creation of a set of measures to secure the systems
System environment: Jira, Confluence, Java, Enterprise Architect, VAIT/DORA, KritisV, GDPR, IT ServiceMgmt, Adesso Ecosphere and Insure Health, DoPIX and successor product, SmartFix, SmartFlow, Zabas, Kolumbus, Clarc archive, BiPRO, AI / LLM, MS Azure, AWS, TOM/FMO
Gernot L.
Last position:
Founder and Managing Director at Softwerk/Ruhr GmbH
- Architecting and developing SaaS platform for graphical definition and execution of pandas data processing pipelines
- Developed POlyglott, an open-source Python CLI tool for translation workflow management featuring PO file parsing, quality linting with glossary enforcement, and DeepL API integration for machine translation
- Developed web application for material compliance management (EU REACH) using Django and modern web technologies
- Built automated infrastructure platform using Proxmox, Terraform, and Ansible — VM provisioning, configuration management, internal DNS, and fleet-wide security hardening across multiple subnets
Ehsan A.
Last position:
Clinical Data Scientist at Freelance
- Conduct data management and statistical analysis for clinical studies on behalf of CROs.
- Guest lecturer at Ivancity University, Paris, specializing in data anonymization techniques and statistical disclosure control.
- Provide scientific and medical writing services for pharmaceutical companies.
- Perform optical mapping data analysis and develop software tools with a focus on algorithm optimization and technical support.
Discover over 15,000 top freelancers
Statistics of experts using C
Aggregated from the professional profiles of matched freelancers.
Experience
21 years
Position duration
2.1 years (Germany: 3.1 years)
Positions per freelancer
16 (Germany: 13)
Top business areas
Information Technology, Product Development, Project Management
Top industries
Information Technology, Manufacturing, Telecommunication
Certification focus areas
Information Technology, Product Development, Project Management
Bachelor's degree or higher
78% (Germany: 90%)
Master's degree or higher
52% (Germany: 65%)
Doctorate
4% (Germany: 11%)
Certifications per freelancer
3 (Germany: 2)
Most common languages
German, English, French
Speak two or more languages
97% (Germany: 98%)
Based on our profile pool as of 29 Oct 2026.
Daily rate distribution
The chart shows how the daily rates of experts in this technology in Dusseldorf 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 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 29 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 (70%)
- Manufacturing (63%)
- Telecommunication (57%)
- Healthcare (40%)
- Automotive (37%)
- Energy (33%)
- Banking and Finance (33%)
- Retail (33%)
Please note that freelancers can work across multiple industries, so percentages overlap.
About the technology
Core language
C is a compiled, procedural programming language built for direct control over memory, data representation and processor resources. It is used for operating-system components, firmware, device drivers, networking software and performance-sensitive libraries. Its stable standards and small runtime make it suitable where predictable behavior matters.
Systems and products
C runs close to hardware and supports software that must remain fast, compact and dependable. Typical deliverables include:
- Microcontroller firmware for connected devices and industrial equipment
- Linux and POSIX system components, utilities and device drivers
- Networking stacks, storage layers and embedded database modules
- Multimedia, telecommunications and real-time processing libraries
Toolchain and ecosystem
Strong C specialists work across compilers such as GCC and Clang, build systems including Make and CMake, and debuggers such as GDB. They understand static analysis, sanitizers, linker scripts, cross-compilation and version control. Depending on the system, they may also use embedded Linux, an RTOS, POSIX APIs, Git and automated test pipelines.
When expertise matters
Companies bring in freelance C professionals when a codebase must run on constrained hardware, integrate with an unfamiliar board or meet strict reliability requirements. In Dusseldorf and the wider Germany market, C skills are relevant to industrial automation, automotive systems, medical equipment, telecommunications and energy technology. Specialists can also support modernization without replacing proven low-level components.
Delivery and collaboration
A C project benefits from clear hardware boundaries, reproducible builds and tests that cover memory, timing and failure behavior. Remote work is practical when repositories, toolchains, hardware access and technical documentation are organized; on-site collaboration can help when physical devices or lab equipment are central. Dusseldorf-based teams may also value German-language communication alongside English technical work.
Signs of quality
Look for professionals who can explain ownership, lifetime, concurrency and resource limits in concrete terms. Useful evidence includes:
- Safe memory handling and disciplined interface design
- Experience with compiler warnings, static analysis and debugging tools
- Tests for hardware faults, timing constraints and boundary conditions
- Clean build automation and documentation for future maintainers
Strong specialists make careful trade-offs between portability, performance and maintainability. They also know when C is the right foundation and when a safer or higher-level component should sit around it.
Frequently asked questions
Key details about C, drawn from the questions we get asked most.
C is commonly used for firmware, operating-system components, device drivers, networking stacks and performance-sensitive libraries. It is a strong fit when software needs compact binaries, predictable resource use and direct interaction with hardware.
C offers a small language core and direct control with little runtime overhead. C++ adds abstraction and object-oriented features, while Rust provides stronger memory-safety guarantees; the right choice depends on existing code, toolchain constraints, hardware and safety requirements.
A strong C specialist often works with GCC or Clang, Make or CMake, GDB, Git and static-analysis tools. Embedded assignments may also require Linux, POSIX, an RTOS, hardware interfaces, cross-compilation and automated testing.
The required depth depends on the system rather than the language alone. A small utility may need a professional who is comfortable with builds and testing, while firmware, drivers or safety-critical code require proven work with memory, concurrency, hardware faults and release constraints.
C work can often be completed remotely when source code, build environments, documentation and test access are available. On-site work in Dusseldorf may be useful for hardware bring-up, laboratory testing or close coordination with manufacturing and industrial teams.
Look for specific deliverables such as firmware modules, drivers, portable libraries or optimized system components. Ask how the professional handled memory ownership, compiler diagnostics, testing, performance limits and failures in the target environment.
Quality in C shows through clear interfaces, controlled ownership, useful tests and builds that reproduce reliably across supported targets. Review warning settings, static-analysis results, error handling, documentation and the reasoning behind low-level trade-offs.
ANSI C is a commonly used name for standardized C, while ISO C refers to the international standard maintained by ISO. In practice, teams should confirm the language version, compiler extensions, portability expectations and target platform before work begins.
The average hourly rate of freelancers in Dusseldorf, Germany who have used C in their recent projects is 95 €, which corresponds to a daily rate of about 764 € based on an 8-hour working day.
Of the freelancers in Dusseldorf, Germany who have used C in their recent projects, 78% hold at least a Bachelor's degree, 52% hold at least a Master's degree, and 4% hold a doctorate.
On average, freelancers in Dusseldorf, Germany who have used C in their recent projects have 21 years of professional experience, with a single engagement typically lasting around 2.1 years.
The most common languages among freelancers in Dusseldorf, Germany who have used C in their recent projects are German (97%), English (97%), and French (13%).
The most common industries among freelancers in Dusseldorf, Germany who have used C in their recent projects are Information Technology (70%), Manufacturing (63%), and Telecommunication (57%).
The most common business areas among freelancers in Dusseldorf, Germany who have used C in their recent projects are Information Technology (93%), Product Development (87%), and Project Management (60%).
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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