Linux Experts in Cologne
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Meet FRATCH Experts in Cologne, who have recently used Linux
Hooman Behmanesh
Last position:
Fullstack Developer at Möbel Roller GmbH
- Further development of the existing e-commerce platform based on SAP Commerce (Hybris) to meet the growing demands of digital commerce.
- Ensuring the scalability and performance of the backend, so the platform remained stable and efficient even under heavy user load.
- Development and integration of new OCC REST APIs and services for modular extensions and flexible adjustments, to implement new features quickly.
- Optimization of data flows and interfaces, which significantly improved platform efficiency and system performance.
- Ensuring a maintainable and scalable code base by using Clean Code principles, proven design patterns, and a future-proof architecture.
- Reduction of errors through extensive testing with JUnit, Mockito, and load tests with Gatling, supported by the introduction of automated test processes.
- Improved system performance through targeted refactoring measures and efficient database queries, especially to handle peak loads.
- Use of modern cloud and monitoring tools such as Kubernetes, Google Cloud Platform (GCP), and Grafana to ensure a stable and monitored infrastructure.
- Clear improvement in efficiency, scalability, and reliability of the platform, which now meets the demands of a dynamic and growing e-commerce market.
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
Markus Blohm
Last position:
Consultant, Technical Project Manager at Lanxess
- Project: ESU Windows and SQL Server consolidation / Configuration Management in ServiceNow
- Creation of an as-is analysis of all servers worldwide
- Creation of an as-is analysis of all SQL servers worldwide
- Creation of requirements analyses for SQL and server migrations
- Coordination of requirements with partners for migrations to Hyper-V (on-premises) or Azure Cloud
- Moderation of jour fixe meetings
- Creation of roadmaps and solution models for server migrations
- Setup of test scenarios
- Moderation of workshops for the introduction of a Global Admin Team
- Creation of data models (CMDB) in ServiceNow
- Conducting workshops for the CMDB data model
- Creation of solution models for the CMDB
- Creation of seamless configuration and work documentation for the CMDB
- Creation of reports for license management
- Creation of KPIs for data quality in ServiceNow
- Creation of a service catalog
- Moderation of workshops for creating service requests
- Interface between needs analysis and ServiceNow development team
- Systems used: Windows 7, Windows 10, Microsoft Office 365/2010, Windows Server 20xx, SQL Server 20xx, SharePoint, Azure Cloud, Hyper-V, ServiceNow, various tools
Rafael De Mestre Gebauer
Last position:
Project Lead Automation at Textile industry
Analysis and optimization of end-to-end processes in different business areas such as sales, procurement, order processing and logistics. Redesign of the ERP. Identification of optimization potential, especially in areas with media breaks and manual tasks, as well as creation of a prioritized transformation roadmap with clear business cases and implementation recommendations. Management of automation initiatives. RPA at the production site in China. Evaluation and introduction of relevant AI use cases as well as building basic AI competence in the organization. Training internal employees of the project team and supporting them in the transformation process to develop a continuous improvement culture. Close collaboration with IT and external implementation partners, reporting to senior management.
Main tasks and achievements:
- Analysis of business processes and design of automated processes
- Training and support for employees in China and Germany
- 20% cost savings in logistics
- Regular status reports to management
Christoph Sawicki
Last position:
Test Manager at Logistics
- Coordination and planning, execution, documentation, and analysis of test cases
- Development of test concepts considering best practices (e.g., test pyramid) with a focus on reliable, automatable test runs
- Implementation and maintenance of test cases according to the test concepts
- Technologies: Citrix Workspace, Shopify, Jira, Xray, MS Teams, MS SharePoint, Confluence, MS Office 365
Nenad Biresev
Last position:
Safety Video Analytics Project for Airbus at Airbus
- Developed a real-time video analytics proof-of-concept for deployment on NVIDIA Jetson edge devices.
- Implemented DeepStream pipelines including object detection, tracking, human pose estimation, face anonymization, and zone intrusion detection.
- Built a Qt/Python demonstration UI interfacing with the AI pipeline via REST APIs.
Fahad Razzaq
Last position:
Data Science – Operations Optimization at Netto-marken
Project: Digitalization of Warehouse Processes | Building a Data Analytics Platform.
- Built a web-based workforce allocation system that digitized daily shift planning by matching worker expertise to operational zones, replacing manual coordination with a structured workflow adopted across the site, saving supervisors time on daily planning.
- Developed a real-time operational visibility dashboard giving supervisors a live view of task throughput and outstanding workload across warehouse zones throughout the day, helping reduce overtime and idle labour costs.
- Developed a slotting optimization solution to improve warehouse picking efficiency and reduce picking time per order, working directly with operations teams from concept through production deployment.
Technologies used: Python, Django, PostgreSQL, Pandas, NumPy, HTML, Java, JavaScript, Docker, Kubernetes, AWS, Power BI, GitHub Actions CI/CD, GitOps, Claude, OpenAI
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.
Sophia Wagner
Last position:
AI Engineer & Technical Consultant at Freelance
- Delivered ML pipelines for OCR, semantic search, and computer vision
- Integrated Azure AI Agents and GPT workflows for automation and QA
- Deployed cloud-based FastAPI services with scalable architecture
- Created integration docs and advised on LLM production readiness
Rainer Langbehn
Last position:
Senior IT Consultant, Senior Software Architect, Senior Software Developer, Senior DevOps Engineer at Techniker Krankenkasse
Automation of the database major / minor releases for the TKeasy project
Concept for database major / minor release automation
As-is analysis
Evaluation of Redgate Flyway functionality
Concept creation
Products: Redgate Flyway, GitHub, Quest, Erwin Data Modeller, Oracle, Atlassian Jira, Atlassian Confluence
Skills: Docker, Continuous Delivery, Continuous Integration, Redgate Flyway, Major Releases, Minor Releases
Stefan Marx
Last position:
Bundesrechtsanwaltskammer
- Design, planning and execution of complex acceptance tests for a document exchange platform for the German justice authorities.
- Validation of decrypted and certificate-based message exchange via web platform, mobile app, and Java API.
- Documentation of test cases, execution steps, and test results.
- Technologies: Windows 11/10, Ubuntu, iOS, Android, Bash for Windows, Java 17, IntelliJ, Git, Jira, Confluence, Citrix Server, xJustiz standard implementation, specific justice software.
Jens Rehsack
Last position:
Technical Product Owner at App Development
Development of a mobile app to slow down the progression of dementia
Coordination of software development (TPO – Technical Product Owner)
agile requirements management (agile requirements engineering)
prioritization of tasks in consultation with stakeholders
stakeholder management
documentation and management of the software architecture
conducting PoC for technology decisions
Documentation as Code
docToolchain, arc42, req42, aim42, tpo42, C4 model, Archimate
ADR, Architecture Decision Records
Docker
Pre-Commit, Conventional Commits, Semantic Versioning
Liberating Structures, Agile Principles, Holacracy, Sociocracy 3.0
Mobile frameworks
AI developing interfaces, LLM
Cordova, Unity
Google Gemini, OpenAI, Character.AI
Prompt 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
Emmanouil Tzouridis
Last position:
Senior Analytics Engineer at Trade Republic Bank GmbH
- Implementation of analytics and automation solutions for the Anti Financial Crime business unit
- Providing the infrastructure, including reusable data models and feature ingestion for production ML and rule based models in the areas of Account Take-Over and Card fraud detection, as well as Customer Risk Assessment
- Tools used: Snowflake, dbt, Looker, AWS, Python, Airflow, Metaflow
Christian Hunkirchen
Last position:
Developer at Opereon Consulting GmbH
- Developed a shop website
- Integrated an AI language model
- Developed tools for AI-powered webhooks
- Technical tools: REACT.js; Elevenlabs; MCP; n8n; HTTP
Discover over 15,000 top freelancers
Statistics of experts using Linux
Aggregated from the professional profiles of matched freelancers.
Experience
20 years (Germany: 21 years)
Position duration
2.4 years (Germany: 5.2 years)
Positions per freelancer
15 (Germany: 14)
Top business areas
Information Technology, Product Development, Quality Assurance
Top industries
Information Technology, Banking and Finance, Telecommunication
Certification focus areas
Information Technology, Project Management, Product Development
Bachelor's degree or higher
86%
Master's degree or higher
65% (Germany: 55%)
Doctorate
11%
Certifications per freelancer
4 (Germany: 3)
Most common languages
German, English, French
Speak two or more languages
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 Linux
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
Linux in practice
Linux is the core operating system behind many servers, cloud instances, containers, and embedded systems. Companies bring in specialists to keep it secure, stable, and easy to automate. It is often the base layer for web services, internal tools, and infrastructure platforms.
Typical work
- Server setup and hardening for production systems
- Shell scripting and automation with Bash
- Package, user, and permission management
- Troubleshooting network, storage, and boot issues
- Support for containers, virtualization, and cloud images
Tooling around it
Strong Linux professionals work comfortably with systemd, SSH, cron, logs, package managers, and common command-line tools. They often combine Linux with Ansible, Docker, Kubernetes, Nginx, or monitoring stacks. Good work is practical: clear configs, repeatable setups, and clean handovers.
When companies need help
A freelance specialist is useful when a team needs quick support for a server migration, a security review, or a failing production host. They also help when internal staff know the application layer but need deeper operating system expertise. In Cologne, this often fits mixed setups where on-site coordination and remote administration both matter.
What strong specialists do
- Diagnose issues fast from logs, metrics, and command output
- Keep services available through careful change management
- Document steps so teams can maintain the system later
- Work cleanly across development, staging, and production
- Communicate clearly with infrastructure and application teams
Common project areas
Linux expertise shows up in cloud migrations, container hosts, CI runners, proxy servers, file services, and edge devices. It also matters for security work, performance tuning, and system recovery. For many companies, the right specialist is the one who keeps the platform predictable and supportable, not just working today.
Frequently asked questions
Everything clients usually want to know about Linux, in one place.
Linux is used as the operating system for servers, cloud workloads, containers, network services, and many embedded devices. Companies rely on it when they need a stable base for web apps, internal platforms, automation, and secure infrastructure.
Linux is usually chosen for command-line control, automation, container workloads, and broad server tooling. Windows Server is often preferred when a company depends heavily on Microsoft-specific software, directory services, or desktop integration.
A strong Linux specialist usually knows Bash, SSH, systemd, networking basics, and log analysis. Depending on the project, Ansible, Docker, Kubernetes, Nginx, storage systems, and cloud platforms are also important.
A Linux project can be small, such as fixing access, permissions, or a service startup issue, or it can be broad, such as rebuilding server standards and automation. For production systems, you usually want someone who has handled similar environments before, not only someone who knows the shell.
Yes, Linux work is often well suited to remote collaboration because most tasks can be done over SSH, VPN, and shared logs. For hardware, network racks, or urgent on-site changes in Cologne, a local presence can still be useful.
A good Linux freelancer explains root cause clearly, makes changes safely, and leaves behind readable documentation. Look for clean system design, sensible automation, and a habit of verifying before and after each change.
Common Linux deliverables include hardened server setups, automation scripts, recovery plans, package baselines, and monitoring-ready configurations. Teams also ask for migration notes, access models, and maintenance documentation that others can use later.
Yes, Linux remains the default foundation for many cloud hosts, container nodes, and build systems. Even when teams work in managed services, they still need specialists who understand the operating system beneath them.
The average hourly rate of freelancers in Cologne, Germany who have used Linux in their recent projects is 93 €, which corresponds to a daily rate of about 742 € based on an 8-hour working day.
Of the freelancers in Cologne, Germany who have used Linux in their recent projects, 86% hold at least a Bachelor's degree, 65% hold at least a Master's degree, and 11% hold a doctorate.
On average, freelancers in Cologne, Germany who have used Linux in their recent projects have 20 years of professional experience, with a single engagement typically lasting around 2.4 years.
The most common languages among freelancers in Cologne, Germany who have used Linux in their recent projects are German (100%), English (96%), and French (11%).
The most common industries among freelancers in Cologne, Germany who have used Linux in their recent projects are Information Technology (91%), Banking and Finance (47%), and Telecommunication (45%).
The most common business areas among freelancers in Cologne, Germany who have used Linux in their recent projects are Information Technology (98%), Product Development (72%), and Quality Assurance (64%).
Main locations of FRATCH Experts, who have recently used Linux
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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Stuttgart 
Dusseldorf 
Leipzig 
Dortmund 
Essen 
Bremen 
Dresden 
Hanover 
Nuremberg Request a free demo
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FRATCH CEO
