C Experts in Düsseldorf
, matched in minutes from over 15,000 CVs with the power of AIHire experts who create embedded software, operating-system components and performance-critical applications with C, supported by strong knowledge of Linux, microcontrollers and debugging tools. FRATCH connects you with vetted, available freelancers through fast, precise AI matching.
Meet FRATCH Experts in Düsseldorf, 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-department collaboration with other specialist teams for operations, further development and reporting.
Firewall vulnerability analysis.
Firewall rule approvals.
Troubleshooting IP communication issues in the network and firewall infrastructure.
Security-critical IT infrastructure, processing of personal data, compliance with legal regulations.
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.
Florian E.
Last position:
Lead Software Engineer
- In this role, I was responsible as Lead Software Engineer for automating various meat production lines.
- My focus was on developing highly available (High Availability) systems using C/C++.
- I also implemented and supported container orchestration with Kubernetes to ensure smooth and scalable production operations.
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
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
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
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
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.
Andreas W.
Last position:
Freelancer at Infrafibre Networks GmbH
- Assessing the current status (planning stage / rollout status) of the so-called inter-polygon routes
- Creating an end-to-end project plan for the individual routes, considering active and passive components and tasks
- Monitoring and controlling the implementation of the plan
- Optimizing the chosen network architecture
- Creating network and splice diagrams
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 19 Sep 2026.
Daily rate distribution
The chart shows how the daily rates of freelancers in this technology in Düsseldorf 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 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 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 (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, general-purpose programming language built for direct control over memory, processors and hardware interfaces. It is used where predictable execution, small runtimes and efficient resource use matter. The C programming language remains central to embedded devices, operating systems, network services and industrial software.
What C builds
C specialists deliver software that must run close to the hardware or remain dependable under strict resource limits.
- Firmware for microcontrollers, sensors and control units
- Operating-system kernels, drivers and system utilities
- Real-time applications for industrial and automotive equipment
- Network stacks, storage components and command-line tools
Ecosystem and tooling
C work commonly sits within a toolchain rather than a single framework. Professionals use GCC or Clang, Make or CMake, Git, GDB, static analyzers and unit-test libraries. They may also work with POSIX, Linux APIs, RTOS environments, cross-compilers and vendor-specific SDKs.
When companies need specialists
Companies bring in freelance C expertise when an existing codebase needs careful modernization, a hardware product requires new firmware, or performance and stability problems demand low-level investigation. Strong specialists can join a defined delivery, support an internal team or take ownership of a difficult subsystem.
- Refactor unsafe or difficult-to-maintain code
- Port software across processors, operating systems or toolchains
- Trace memory errors, race conditions and timing faults
- Create test plans for hardware-dependent behavior
Skills beside C
Effective C professionals understand data structures, pointers, memory ownership and concurrency. They also read hardware documentation, reason about compilation and linking, and use profilers, debuggers and sanitizers. Depending on the project, valuable adjacent knowledge includes C++, Python for tooling, SQL, shell scripting, electronics and CI pipelines.
Signs of strong expertise
Look for specialists who explain trade-offs clearly and can show how they manage interfaces, error handling and resource limits. Practical quality includes readable code, reproducible builds, meaningful tests and disciplined review of undefined behavior. For Düsseldorf-based teams, remote collaboration can work well when requirements, hardware access and documentation are organized; on-site work may help when equipment or laboratory testing is central.
Frequently asked questions
Key details about C, drawn from the questions we get asked most.
C is used for firmware, operating-system components, device drivers, real-time control software and high-performance libraries. It is a strong fit when software must interact directly with hardware or run with limited memory and processing capacity.
C offers a small language core and direct control, but it leaves more memory-safety responsibility to the programmer. C++ adds abstraction and object-oriented features, while Rust provides stronger compile-time safety; the right choice depends on existing code, hardware support, team skills and delivery constraints.
A strong C specialist may also know Linux or POSIX, embedded operating systems, GCC or Clang, CMake, Git and GDB. Knowledge of microcontrollers, communication protocols, electronics, Python tooling or C++ can be important for the surrounding system.
The required depth depends on the risk and scope of the system rather than a fixed duration. A small utility may need solid language fundamentals, while safety-critical firmware, kernel work or complex concurrency requires proven experience with debugging, testing and the target platform.
Yes, many C tasks can be completed remotely through source control, build automation, remote debugging and clear technical documentation. On-site collaboration in Düsseldorf is more useful when the work depends on physical prototypes, laboratory equipment or restricted hardware access.
Ask how the specialist handles ownership, pointer arithmetic, allocation failures, concurrency and undefined behavior in C. Review a practical example involving debugging or code review, and ask how they would test behavior that depends on timing or hardware.
Quality in C shows in clear ownership rules, bounded resource use, defensive error handling and interfaces that are easy to test. Check whether the specialist uses compiler warnings, static analysis, sanitizers, automated tests and reproducible builds rather than relying only on manual inspection.
ANSI C refers to standardized versions of the C language, while ISO C is the international standardization path used for later revisions. A specialist should understand the language version supported by the compiler and target platform, and avoid relying on extensions that reduce portability unless they are deliberate.
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 763 € 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.
Berlin 
Hamburg 
Munich 
Cologne 
Frankfurt 
Stuttgart 
Leipzig 
Dortmund 
Essen 
Hanover 
Nuremberg Request a free demo
Get in touch with the FRATCH team and we will get back to you within 4 hours.
Would you rather directly get in touch?
We always have the time for a call or email!
Philipp Thomaschewski
FRATCH CEO
