Unix Experts in Cologne
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Meet FRATCH Experts in Cologne, who have recently used Unix
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
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
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.
Achim Reiners
Last position:
Project and Program Manager, PMO Lead at Freelancer / Interim Manager
- Project management for the location consolidation of a major telecom provider (client: Telefonica) since 2023
- IT multi-project management for a large leasing company (client: Athlon) from 2021 to 2022
- Migration of applications to the cloud and to another data center
- Extension and optimization of the application landscape through additional projects
- Project management for developing a platform for internet access on airplanes of various airlines (client: m3Connect/Deutsche Telekom) 2021
- Responsible leadership of an IP network consolidation (infrastructure project) at a major telecom provider (client: Cisco/Vodafone) from 2017 to 2020
- Planning and coordination of migrations and rollouts
- Team leadership integrating different teams (network operators, hardware and service suppliers)
Sebastian Hefczyk
Last position:
Overall Project Manager; Turnaround Manager & Coach at Statutory Health Insurance Fund
- Taking over the troubled project from the internal project management and successful turnaround of project phase 1 (cutover of approx. 1000 servers (VMs)/standard desktops, specialized desktops)
- Responsible project management for the successful phase 1 transition (planning in the shortest possible time followed by implementation (very successful with low ticket volume))
- Stakeholder management – taking over direct (daily before cutover) communication with the client from the Chief Operation Manager in the format of regular meetings in taskforce mode. Rapid rebuilding of the previously lost trust base and restoration of the client relationship for optimal satisfaction
- Taskforce mode to eliminate all existing issues/showstoppers before cutover
- Scope clarification, setup, and scheduling of phase 2 activities (e.g. silo/admin servers)
- Kick-off of phase 2 / handing the project back to the success line for the internal project management/line to handle the remaining defined topics
- Establishing, preparing, and conducting steering committees with V-1 management to align the guardrails
- Moderation of various regular meetings and operational workshops
- Participation in the lessons learned with the client to address dissatisfaction related to the internal project management (before my start! They are extremely satisfied with my work)
- Tools: Atlassian Suite (Confluence/JIRA), MIRO, Sharepoint; MS Office (PowerPoint, Excel, MS Project)
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
René Karges
Last position:
Freelancer at Freelance work
- Business analysis
- Requirements management
- Project management
- Stakeholder management
- Team leadership
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
Pierre Gronau
Last position:
Ansible Automation, Windows Third Level Support at DB InfraGO AG
- PRISMA project
- Ansible automation
- Windows third level support for Windows NT, Windows 2000, Windows 2013, Windows 2016, Windows 2019
Peter Brungs
Last position:
Data Warehouse Consultant (Development and Analysis) at Atruvia AG
- Developed and enhanced ETL loading jobs with IBM DataStage and optimized SQL in an IBM DB2 environment as part of the Agree21 data migration
- Analyzed data quality and developed test procedures
- Created PowerShell scripts and documented GIT deployment processes
- Technologies: RedHat Linux, IBM DB2 with DBVisualizer, IBM InfoSphere DataStage 11.7, JIRA, TortoiseGIT, TortoiseSVN, PowerShell scripts
Robert Meixner
Last position:
Air traffic tax German Customs Administration SOAP Webservices Client Requests at Team GmbH
In the citizens' and business customer portal of the Customs Administration, airlines submit applications for departures and landings every month
These applications are forwarded to the caseworkers via SOAP web service and, after review and processing, any queries or notifications are returned via SOAP web service
PL/SQL programming of SOAP webservices client requests for HTTP/XML message exchange between the BuG portal and the caseworkers
New creation and change requests for Forms and Reports 12 modules
Forms applications start and read SOAP webservice requests via PL/SQL packages, process them and send Reports 12 documents to the airlines
Fabian Zur Heide
Last position:
Freelance IT Specialist
IT specialist Application Engineering / Software Development since 2012
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 Unix
Aggregated from the professional profiles of matched freelancers.
Experience
27 years (Germany: 26 years)
Position duration
2.6 years (Germany: 3.2 years)
Positions per freelancer
23 (Germany: 18)
Top business areas
Information Technology, Product Development, Project Management
Top industries
Information Technology, Banking and Finance, Automotive
Certification focus areas
Information Technology, Project Management, Operations
Bachelor's degree or higher
75% (Germany: 82%)
Master's degree or higher
42% (Germany: 49%)
Certifications per freelancer
4 (Germany: 3)
Most common languages
German, English, French
Speak two or more languages
94% (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 Unix
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
What Unix is
Unix is a family of operating systems built for stability, multiuser access, and strong command-line control. Companies use it for server workloads, internal tools, and environments where reliability matters more than a flashy interface. It still appears in many long-running IT estates, especially where scriptable administration is part of daily work.
Typical work
- Server setup and hardening
- Shell scripting and automation
- User, file, and process management
- Network and service troubleshooting
- Support for legacy applications and tools
Unix specialists help keep these systems predictable under load. They work on routine maintenance, incident fixes, and changes that must not interrupt business-critical services.
Tooling and ecosystem
Strong Unix work usually includes the shell, standard system utilities, cron, SSH, and text tools such as awk, sed, and grep. Depending on the environment, experts may also handle package management, logging, permissions, init systems, and storage configuration. In Cologne, this often matters for companies with mixed on-premise and remote operations.
When to bring in help
Bring in freelance expertise when a Unix environment is hard to maintain, poorly documented, or tied to older applications. A specialist is also useful for migrations, build automation, access cleanup, and incident response. Companies often look for support when internal teams need deep command-line skill without adding permanent headcount.
What strong experts do
- Read and explain system behavior quickly
- Write clear scripts that others can maintain
- Work safely on production systems
- Document changes and recovery steps
- Spot fragile assumptions before they break
Good Unix professionals are precise. They know when to use standard tools, when to avoid custom changes, and how to keep systems understandable for the next person.
Collaboration in practice
Unix work can be done remotely when access, documentation, and change control are in place. On-site support helps when teams need close coordination with operations, infrastructure, or local compliance processes. In Cologne, English is often enough for technical collaboration, but German can help in mixed teams and handover sessions.
Frequently asked questions
Need clarity? These are the questions we hear most often about Unix.
Unix is used for server operations, scripting, system administration, and running long-lived business applications. It is common in environments that value stable command-line workflows, controlled access, and predictable behavior. Many teams still rely on Unix for services that should change carefully and run without much interruption.
Unix is the original family that shaped many later systems, while Linux is a separate open-source kernel with a Unix-like design. macOS is also Unix-based, but it is used differently and comes with Apple’s own tooling and desktop focus. For hiring, this means you should check whether the expert knows classic Unix systems, Unix shell work, or broader Unix-like administration.
A strong Unix specialist usually knows shell scripting, permissions, process handling, logging, SSH, and basic networking. In many projects, they also need awk, sed, grep, cron, and safe change management. If the system is tied to older software, experience with package handling and service control is valuable too.
A Unix freelancer is most useful when a system is old, under-documented, or too sensitive for trial-and-error changes. Teams also bring in help for audits, migrations, automation, and hard-to-trace incidents. If your internal staff can maintain the system but need deeper command-line expertise for a short period, freelance support fits well.
Yes, most Unix tasks can be handled remotely if secure access, logging, and change approval are in place. Remote work is a natural fit for scripting, troubleshooting, and documentation. On-site time is only needed when hardware, restricted networks, or team handovers make local presence useful.
A strong Unix expert explains what they changed, why they changed it, and how to roll it back. They avoid fragile one-off fixes and prefer readable scripts and standard tools. Look for people who can diagnose problems from logs, reproduce issues calmly, and document the result clearly.
Unix projects often focus on continuity: maintenance, stabilization, scripting, and keeping existing services healthy. Linux migrations usually add more platform change, packaging differences, and application compatibility checks. If your current stack is already Unix-based, the best freelancer is often someone who can preserve behavior while improving operations.
Ask which Unix variants they know, what shell and automation tools they use, and whether they have worked on systems similar to yours. You should also ask how they handle access, change control, backups, and incident communication. The best answers are concrete and show they understand both the technical system and the operational risk.
The average hourly rate of freelancers in Cologne, Germany who have used Unix in their recent projects is 103 €, which corresponds to a daily rate of about 827 € based on an 8-hour working day.
Of the freelancers in Cologne, Germany who have used Unix in their recent projects, 75% hold at least a Bachelor's degree and 42% hold at least a Master's degree.
On average, freelancers in Cologne, Germany who have used Unix in their recent projects have 27 years of professional experience, with a single engagement typically lasting around 2.6 years.
The most common languages among freelancers in Cologne, Germany who have used Unix in their recent projects are German (100%), English (94%), and French (19%).
The most common industries among freelancers in Cologne, Germany who have used Unix in their recent projects are Information Technology (94%), Banking and Finance (63%), and Automotive (56%).
The most common business areas among freelancers in Cologne, Germany who have used Unix in their recent projects are Information Technology (100%), Product Development (81%), and Project Management (75%).
Main locations of FRATCH Experts, who have recently used Unix
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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Hamburg 
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Stuttgart 
Dusseldorf 
Essen Request a free demo
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Philipp Thomaschewski
FRATCH CEO
