C Experts in Cologne
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Meet FRATCH Experts in Cologne, who have recently used C
Burhan Dinler
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
Muhammad Jamshaid Iqbal
Last position:
Embedded Linux Intern – IoT Sensor Prototype Development at DHL
- Built a modular C++ 20 embedded Linux acquisition system on a Raspberry Pi, synchronizing IMU and dual-camera data streams to sub-millisecond accuracy.
- Integrated retro-reflective and contrast sensors to trigger acquisition and detect gaps between sorter rails.
- Implemented SPI & I2C sensor communication, GPIO interrupt handling with libgpiod, and CSV & JSON output.
- Designed a multi-threaded acquisition pipeline and an SPSC queue between acquisition and writer threads.
- Built a Python/HTML/CSS based web-server and validated the prototype in a DHL warehouse for defect detection.
- Documented software behavior, configuration, and results for maintainable handover and further development.
Stanislaus Stelle
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
Kai Birkenbusch
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
Andreas Wißkirchen
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
Anup Raj Dubey
Last position:
Cybersecurity Expert at Autosec Innovation Private Limited
- Technically leading an international team on Aurix 2nd Generation (TC3XX) multicore AUTOSAR architecture, supporting various OEM programs.
- Responsible for customer security requirements analysis, asset identification, and deriving TARA and security concepts at the system level.
- Conducted system and software/hardware vulnerability analysis and implemented cybersecurity solutions using Crypto, HSM, MPU, BSW, OS, and ISO 21434-compliant stacks provided by Vector.
- Led architecture discussions with OEMs and suppliers to align cybersecurity strategies with vehicle platforms.
- Contributed to the design and integration and testing of SecOC, UDS authentication and wireless interfaces like WiFi, Bluetooth, V2X ensuring secure and seamless vehicle access.
- Addressed security challenges such as relay attacks, replay attacks, and credential spoofing through advanced threat modeling and mitigation strategies.
Jeanne Yap
Last position:
Process Engineering Intern at Procter & Gamble
- Independently initiated and deployed automated validation workflows using Python, cutting manual processing by 58% and improving efficiency
- Developed a machine learning model for synthetic defect generation, reducing downtime and production costs; deployed locally and via Databricks and Azure AI Factory
- Utilized a small dataset of image data from the production lines and extended this dataset with training on models like cycleGAN and pix2pix
- Built and optimized the Linux-based development environment for training 3D models; maintained reproducibility via GitHub
- Presented technical insights to cross-functional teams (engineers, QA, project managers), ensuring alignment of ML solutions with operational needs
Vladimir Maznicenko
Last position:
Developer at Financial services provider
- Support and further development of a framework for developing applications in a banking association: DynS/OSPE
- Migration of the framework to Java 11 and Java 17
- Java8, Java11 and Java17, Spring, Spring-Batch, Spring WebServices, Spring-Security, Spring-Data, JPA, Hibernate, OpenSource libraries etc.
- XML, JAXB, JSON, REST and SOAP services, DB2, Oracle, WebSphere or Liberty AS, FreeMaker, Junit, mock libraries, JaCoCo, Maven, IntelliJ, Eclipse, GitHub, SVN, Jira
Denis Kirpicev
Last position:
Management Consultant at Freelance Management Consultant
Implementation of custom reporting solutions for financial KPIs aligned with specific business requirements
Development of a machine learning application that achieved a 250% performance improvement
Data Architect "Production-Oriented Quality Assurance" (03/2024–09/2024):
Design and implementation of an analytics platform to detect quality deviations in manufacturing
Build of a scalable data lakehouse architecture on Databricks in combination with SAP ERP data via SAP Datasphere
Close collaboration with the SAP team to harmonize bill of materials and order data
Visualization of KPIs to support shopfloor management
Lead Data Engineer "Sales Performance Monitoring" (08/2023–12/2023):
Design and implementation of a Databricks-based platform for analyzing sales figures and promotion effects
Integration of SAP SD data via SAP BW/4HANA
Use of Azure DevOps to orchestrate ETL jobs and deploy workflows
Technical Project Lead "Cloud Migration & Data Strategy" (02/2023–05/2023):
Migration of a heterogeneous data warehouse stack to a modern cloud architecture on Azure with Databricks as the central processing platform
Development of a governance-compliant data architecture to integrate SAP financial data and non-SAP sources
Technologies: Databricks, Delta Lake, Python, SAP Datasphere, Azure DevOps, PowerBI, SQL
Filipp Trigub
Last position:
Multi-chain LLM copilot for academic teaching and studying at Infolab.ai
- Build a sophisticated AI copilot to augment the students’ learning experience and provide AI-derived insights to professors.
- Build a multi-chain LLM system adapting to user needs at its own accord with a Weaviate vector DB based RAG system and evaluated it with Ragas.
- Build responsive react frontend, and backend systems handling auth, data management and auxiliary services as a RESTful API.
- Deployed and managed the app to the cloud in a production environment including the CICD via multi-stage deployment.
Ingo Cousin
Last position:
Founder, freelance CMS expert at CMS Consulting Cousin
- Freelance work as a CMS expert
Fatih Karakurt
Last position:
Mobile App Developer at ING Belgium
- Part of a squad focused on intensive module development and integration
- Close collaboration with other squads and teams to integrate modules and essential components
- Use of SwiftUI and the Coordinator pattern to develop clean and understandable code
- Creative collaboration with UX designers in Figma and implementation in code
- Industry: Banking
- Project language: English
- Organizational form: Kanban
- Tools: Azure, Confluence, Figma, Teams
- Team size: 40 people
- Version control: Git, GitFlow, Azure
- App Store product: ING Banking
- Programming languages: SwiftUI, Swift
- Patterns: Coordinator, MVVM
- Swift Package Manager
- Localization: Yes
- Testing: XCTest, XCUITest
Andreas Beckers
Last position:
Senior Frontend Developer at Roadex
- Development of an app
- Technologies: React Native, Expo, SupaBase, TypeScript, GitHub, Trello
Ange Gouanou
Last position:
Career Reorientation and Development
- Further training in practical application of artificial intelligence
- Further training in CAM configuration with practical implementation
- Support for volunteer projects
Allal Kharaz
Last position:
Java Senior Full Stack Developer at Insurance ÖRAG
- Further development of a policy administration system (contract/claims) for the legal expenses insurer ÖRAG.
- My role: Senior Software Developer.
- The team consists of 12 developers.
- Technologies used: Java 8/21, Java EE, Quarkus, WebLogic, JPA, RabbitMQ, JTA, CI, CD, Jenkins, DB2, Maven, Jenkins, GIT (bitbucket) later GitLab, Junit, Elasticsearch, Mockito, Jira, SonarQube, Scrum, React, Workflow
- Migration and modernization of legacy systems: rewrote C and C++ code in Java to improve maintainability, scalability, and performance. Refactored Python into Java, including optimization and integration into modern architectures.
- Study on the use of AI (Codex) for implementing a Java feature. The goal is to compare the time spent and productivity of AI-supported development with a classic implementation by a developer. The results should show how strongly the use of AI affects development time and efficiency.
- Development of the following tariff calculators for the years 2024/2026: private, companies, doctors, farmers, owner-occupied G + H, landlords, traffic, club, top managers, sales representatives, special criminal law, savings bank, municipal, BayGT, doctors, Dehoga
Discover over 15,000 top freelancers
Statistics of experts using C
Aggregated from the professional profiles of matched freelancers.
Experience
20 years (Germany: 23 years)
Position duration
2.1 years (Germany: 3.1 years)
Positions per freelancer
13 (Germany: 14)
Top business areas
Information Technology, Product Development, Quality Assurance
Top industries
Information Technology, Automotive, Manufacturing
Certification focus areas
Information Technology, Operations, Project Management
Bachelor's degree or higher
93% (Germany: 88%)
Master's degree or higher
73% (Germany: 61%)
Doctorate
13% (Germany: 11%)
Certifications per freelancer
2 (Germany: 3)
Most common languages
German, English, French
Speak two or more languages
100% (Germany: 98%)
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 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 30 Aug 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
About the technology
Core use
C is the language behind software that must stay small, fast, and close to the hardware. It is used for firmware, operating systems, network tools, databases, and performance-sensitive libraries. Many teams still call it C, ANSI C, or ISO C, depending on the codebase and standard in use.
Where it fits
- Embedded systems and device firmware
- System software and runtime components
- Protocol handling and low-level tooling
- Legacy product maintenance and refactoring
C is still common in Cologne teams that work on industrial systems, connected devices, telecom, and infrastructure software. It also appears in projects that must integrate with C++ or other higher-level stacks while keeping a stable native layer.
Tooling and standards
Strong specialists know compilers, build systems, debuggers, memory analysis tools, and the rules of modern C standards. They work with headers, translation units, static libraries, shared libraries, and cross-platform builds. Good C work depends on disciplined testing, code review, and careful use of pointers, ownership, and APIs.
When to bring in help
Companies bring in freelance C experts when a product has hard performance limits, difficult bugs, or old code that still matters. They are also useful when teams need a clean bridge between hardware, drivers, and application code.
What strong experts deliver
A strong C specialist writes code that is readable, portable, and easy to maintain. They trace memory issues, reduce undefined behavior, improve build reliability, and document interfaces clearly. They also know when to keep the design simple instead of adding layers that hide the real problem.
Good fit for Cologne teams
In Cologne, C experts often work with local product teams on-site for hardware-heavy or security-sensitive tasks, then continue remotely for reviews and maintenance. For distributed work, clear documentation and a shared build setup matter more than location. The best specialists adapt quickly to the team’s standard and release process.
Frequently asked questions
What clients ask us most about C — answered in short.
C is used where software must be efficient, predictable, and close to the system. Companies choose it for firmware, kernels, networking code, embedded products, and core libraries that other software depends on.
Choose C when the priority is a small runtime, direct control, and broad portability. Compared with C++, it avoids heavier abstractions; compared with Rust, it is usually simpler to fit into older toolchains and existing native codebases.
A strong C specialist should also be comfortable with build systems, debugging, memory analysis, and basic operating-system concepts. Knowledge of CMake, Make, Git, Linux, compilers, and test tooling is often important in practice.
A C project works best when the scope is clear: target platform, compiler, standard, build setup, and performance or safety constraints. The more legacy code or hardware dependency there is, the more important a careful initial review becomes.
Often yes, especially for maintenance, code review, and library work. For firmware, lab access, or hardware bring-up, Cologne teams may prefer some on-site time at the start, then move the rest of the work remote.
Look for clean code, careful handling of pointers and memory, and the ability to explain trade-offs in plain language. A good C specialist also asks about the compiler, platform, test strategy, and failure modes before writing changes.
C experts are often brought in for crashes, leaks, buffer handling problems, race conditions, and undefined behavior. They also help when old code compiles but behaves differently across platforms or toolchains.
Yes. Many long-lived products still depend on ANSI C or code written to older C conventions, and those systems often need maintenance rather than a rewrite. A good specialist knows how to work safely within those constraints while modernizing the parts that can change.
The average hourly rate of freelancers in Cologne, Germany who have used C in their recent projects is 98 €, which corresponds to a daily rate of about 786 € based on an 8-hour working day.
Of the freelancers in Cologne, Germany who have used C in their recent projects, 93% hold at least a Bachelor's degree, 73% hold at least a Master's degree, and 13% hold a doctorate.
On average, freelancers in Cologne, Germany who have used C in their recent projects have 20 years of professional experience, with a single engagement typically lasting around 2.1 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 (35%).
The most common industries among freelancers in Cologne, Germany who have used C in their recent projects are Information Technology (88%), Automotive (53%), and Manufacturing (53%).
The most common business areas among freelancers in Cologne, Germany who have used C in their recent projects are Information Technology (100%), Product Development (82%), and Quality Assurance (53%).
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 
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.
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Philipp Thomaschewski
FRATCH CEO
