Unix Experts in Dusseldorf
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Meet FRATCH Experts in Dusseldorf, who have recently used Unix
Arndt Maas
Last position:
Project Manager for ServiceNow Vulnerability Response at Union Investment Services & IT GmbH
- Led the subproject for implementing Vulnerability Response as part of DORA
- Documented the current processes in compliance, risk & security
- Created the functional design for introducing application, infrastructure, and cloud vulnerabilities
- Agile management of the integration service provider, the technical department, and the company's cross-functional teams
- Integrated the V scanners Tenable, Qualys and Defender, as well as NVD and CISA/KEV
- Integrated GitLab Ultimate for importing and processing SBOMs
- Developed automation rules to match scan results with CIs in the CMDB, assign vulnerabilities and remediation tasks, handle approvals (false positives, exceptions) and closures
- Calculated multiple risk scores and priorities
- Defined dashboards and reports (Workspaces, Performance Analytics)
- Aligned the new processes, especially to improve the CMDB data quality (according to CSDM)
Frank Dostert
Last position:
Project Manager at TEAG Thüringer Energie AG
- Transition of Microsoft Azure operations to BTC AG
- Responsibility: budget of €60k
- Staff: leadership of 5 people
- Tools: Office 365, JIRA, Confluence
Christian Wonneberger
Last position:
Software Engineer, cross-platform Application Manager at International major bank
- Creating interfaces between the legacy platform and the new container solution
- Coordinating required contributions from line units
- Moderating regular status meetings with the software vendor
- Minimally invasive conversion of TWS scheduling from the old to the new platform
- Environment: IBM Mainframe, DB2, CICS, MQ, Red Hat Linux, Oracle, Kubernetes, Kafka, Helm, GitLab, Jenkins
Rashmi Kondli
Last position:
Service Lifecycle Manager at Vodafone Group Services GmbH
Ensured 99%+ platform availability across Android, iOS, and web, maintaining zero customer-impact and zero P1 incidents through proactive monitoring and risk mitigation.
Led Incident, Problem, and Change Management with offshore operations and vendors, driving rapid issue resolution and improving product stability.
Partnered with QA teams and international OpCos to validate defects, reproduce issues, and enhance product quality using real-time customer insights.
Managed end-to-end lifecycle activities including platform migrations, infrastructure upgrades, certificate renewals, and integrations (Identity, API, Messaging).
Established operational excellence and governance by designing service support models, leading Early Life Support (ELS) and post-launch stabilization, delivering KPI reporting, and ensuring seamless transition from project to service management.
Product: Secure Net - Classic, Converged & Home Wifi Protect
Product Description: The all-in-one digital security service that helps keep you and your family safe online when using the Vodafone (Mobile and Broadband) network. Get alerts if your personal information shows up anywhere it shouldn't, whilst we find and block malicious content across all your devices using.
Clients: Vodafone OpCos - Spain, Italy, UK, Ireland, Greece, Turkey, Germany, Portugal, Romania
Role & Location: Service Manager for Lifecycle and Operations at Düsseldorf, Germany
Worked with/on: ITSM Remedy, Jira, Confluence, Splunk, Dynatrace, Tableau, Mongo DB, Google Analytics, App Follow
Archana Ravikumar
Last position:
Power BI Assistant at Cataliquent Projekt GmbH
- Evaluate, design, and implement Power BI solutions for Cat4 reporting, significantly improving reporting efficiency, accuracy, and stakeholder visibility.
- Develop and maintain robust data integration interfaces between Cat4 and Power BI, eliminating manual processing bottlenecks.
- Configure and continuously optimise Power BI reports to deliver sharper management insights and support data-driven decision-making.
- Ensure full GDPR data protection compliance across Power BI reports, proactively identifying and mitigating risks.
- Acquired in-depth product knowledge of CAT4, a globally deployed enterprise platform, enabling effective requirements analysis, solution design, and seamless Power BI integration across client environments.
- Developed and integrated scalable reporting templates within the CAT4 product interface, delivering new product features and enhancing data visualisation, reporting efficiency, and stakeholder visibility across global users.
- Trained and mentored staff on Power BI configuration and best practices, accelerating adoption and embedding a data-driven culture.
- Prepared clear technical documentation and delivered hands-on demonstrations to end users and clients, ensuring smooth adoption and confident use of Power BI solutions integrated with CAT4.
- Researched and recommended licensing strategies for cost-effective and scalable Power BI deployment.
SKILLS - BI & Visualisation: Power BI (Desktop, Service, Report Builder), DAX, Power Query
Project and Product Management Tool: CAT4
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)
Hans-Dieter Große-Kreul
Last position:
Training as an AI Expert
I continuously expand my expertise in AI and automation, working with ChatGPT, OpenAI, Manus, Gemini, MS CoPilot, API, LangChain, Hugging Face, Manus, TensorFlow and Auto-GPT as well as Python-based ML frameworks and MLOps tools to intelligently transform classic software development, analysis, and testing processes.
Kai V. Wulffen
Last position:
Process Manager in Operational Change Management at Jungheinrich AG
- Introduction of a central change process
- Technical support for the operational implementation of changes (ITIL technical change management)
- Co-design and technical implementation of digital processes
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
Esmail Saberi
Last position:
Senior Load and Performance Tester at Deutsche Bahn (DB-Netz)
- Design, development, and execution of load and performance tests for the PRISMA project
- Use of Apache Jmeter, Gatling, Apache ActiveMQ, Jms/Tibco Ems, SikuliX, Jython, Amazon AWS, PAN-Client
- Methods: load tests, test automation
Nirajh Sivagnanam
Last position:
Business Analyst/Project Manager at ING-DiBa AG.
- Led the “New UBS Custodian” project in agile mode
- Responsible for planning, coordinating and implementing the project
- Created project and milestone plans, including goal definitions, detailed schedules and resource allocation
- Conducted as-is and to-be process analyses with operational departments
- Prepared detailed requirements analyses and specifications for development teams and IT providers
- Supported the technical implementation of the developed business concepts
- Ensured requirements and specifications were met during the implementation phase
- Managed process activities for KeyLink asset onboarding
- Acted as interface between internal stakeholders, the provider FIS and UBS
- Planned and led the steering committee meetings
Jan G.
Last position:
Master Data Application at confidential
Visualization, search, and maintenance of various types of master data, providing them via a REST API, and implementing a variety of import and export formats.
Implementation, architecture, project management.
Technologies and tools: Angular (Signals, Signal Store, swagger-codegen, standalone components), Java, PostgreSQL, ActiveMQ, JavaScript, Spring Boot (Spring Core, Spring MVC, Spring Data/JPA via Hibernate, Spring Security, Spring Modulith), JUnit, Flyway, QueryDSL, GraphQL, REST API, Node, npm, Maven, SonarQube, GitLab CI/CD pipelines, Docker, Nexus, OpenAPI + Swagger UI, Keycloak, OAuth2, OpenID Connect, IntelliJ IDEA, Jira, Confluence.
Sebastian Chece
Last position:
Public institution responsible for educational institutions in NRW
- Consulting on processes and execution of load tests, performance tests and technical tests of various applications: web portal, file cloud, email, video conferencing, learning/course platform
- Creating the load test framework
- Programming test scripts (JMeter, Selenium)
- Developing batches to support the evaluation
- Executing load tests and evaluating results, including clear reporting, recommendations for action, and bottleneck analysis
- Managing tasks and collaboration to achieve meaningful load test results
Dalia Cananau
Last position:
Oracle Developer at Freelance
- Design and implementation of an OCI-based data warehouse and ETL system to replace legacy mainframe applications
- Developed a database optimization strategy and planned the rapid conversion of JCL and COBOL routines to PL/SQL using AI
- Developed an Oracle Apex-based app for internal administrative processes in the public sector (office equipment, staff training)
- Implemented PL/SQL workflows for approval processes and created a responsive mobile version with JavaScript and CSS
- Used Azure DevOps for backlog management and documentation, and Git for version control
- Developed REST interfaces to CRM systems
- Replaced and reprogrammed Oracle Forms screens with Oracle Apex and updated to the latest Apex versions
- Designed a Git branching strategy and conducted code reviews
- Maintained and further developed an EDI-based data exchange system based on Oracle Advanced Queuing for the public sector in Austria
- Performed data analysis and created charts in the Oracle Apex frontend; installed standalone ORDS and Apex 23.1
- Worked agile using the Spotify model; developed complex Apex pages with support from Oracle JET
- Rebuilt and customized existing PL/SQL packages, created workarounds for database version differences, and optimized queries
- Developed Apex applications for broker pools to manage and optimize Oracle databases in the banking environment, including SSO-based authorization systems with OAuth2 and Keycloak
- Built extensive Oracle Apex applications for BI and data mining modernization projects and developed manual and automated projection methods in the frontend
- Carried out data warehousing projects in the banking sector and used Scrum and Kanban in team projects
Bernhard Döpper
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
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
16 (Germany: 18)
Top business areas
Information Technology, Product Development, Project Management
Top industries
Information Technology, Banking and Finance, Telecommunication
Certification focus areas
Information Technology, Project Management, Strategy
Bachelor's degree or higher
71% (Germany: 82%)
Master's degree or higher
29% (Germany: 49%)
Doctorate
14% (Germany: 11%)
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 Dusseldorf 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 Dusseldorf 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 covers
Unix is a family of operating systems used for reliable servers, network services, and technical back ends. Companies bring in Unix specialists for system setup, user and process management, storage, networking, and automation on business-critical machines.
Typical work
- Server installation and configuration
- Shell scripting and cron jobs
- Security hardening and access control
- SSH, logs, backup, and recovery tasks
- Troubleshooting performance and availability
Unix also appears in embedded environments, telecom, finance, and older enterprise stacks that still run core services on AIX, Solaris, or HP-UX.
Tools and ecosystem
Strong Unix professionals work comfortably with POSIX tools, Bash, ksh, sh, vi, awk, sed, grep, tar, and system services. They understand permissions, daemons, init systems, package handling, and how to move safely between Unix and Linux without breaking scripts or operations.
When to bring in help
Companies usually ask for freelance Unix expertise when a migration is risky, a server is unstable, or internal teams need short-term support. In Dusseldorf, that often matters for industrial, logistics, and enterprise environments where remote access, clear documentation, and low-disruption work are important.
What good specialists do
Good Unix experts read system behavior, not just error messages. They document changes, keep scripts portable, and test carefully before touching production.
- They explain root causes clearly
- They know classic command-line workflows
- They keep automation simple and maintainable
- They handle legacy systems without guesswork
Common project shapes
Unix work often comes in the form of incident support, hardening, migration planning, script cleanup, and handover to internal teams. A strong specialist can work with infrastructure teams, application owners, and security stakeholders, then leave the environment easier to operate than before.
Frequently asked questions
Key details about Unix, drawn from the questions we get asked most.
Unix is used for stable server work, network services, scripting, and long-running business systems. It shows up in environments where reliability, clear permissions, and predictable command-line tooling matter more than a modern desktop look.
Unix is the older family that many systems and standards grew from, while Linux is a separate Unix-like operating system. Companies often compare them when they need to keep legacy scripts, admin habits, or platform-specific tooling working across both.
A strong Unix specialist usually knows shell scripting, POSIX tools, SSH, permissions, logs, and service management. Depending on the system, experience with AIX, Solaris, HP-UX, or Linux compatibility also helps.
Unix projects that involve production servers, migrations, or security work need someone who has handled similar systems before. Simple maintenance can be covered faster, but legacy environments and business-critical machines benefit from deeper platform knowledge.
Yes, much Unix work is remote because it is command-line driven and documented through tickets, logs, and change plans. On-site help is useful when hardware access, local networks, or sensitive operations require someone physically present in Dusseldorf.
Ask which Unix variants they know, what production incidents they have handled, and how they approach backups and rollback. It also helps to ask for examples of shell scripts, hardening work, or migrations they have completed.
A good Unix expert explains trade-offs, avoids risky shortcuts, and leaves behind clean documentation. Look for clear change plans, careful testing, and a calm approach to legacy systems rather than flashy claims.
No, Unix is the broader family, while AIX and Solaris are specific operating systems in that ecosystem. A freelancer who understands the differences can keep vendor-specific commands and system behavior from causing avoidable problems.
The average hourly rate of freelancers in Dusseldorf, Germany who have used Unix in their recent projects is 108 €, which corresponds to a daily rate of about 861 € based on an 8-hour working day.
Of the freelancers in Dusseldorf, Germany who have used Unix in their recent projects, 71% hold at least a Bachelor's degree, 29% hold at least a Master's degree, and 14% hold a doctorate.
On average, freelancers in Dusseldorf, 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 Dusseldorf, Germany who have used Unix in their recent projects are German (100%), English (94%), and French (24%).
The most common industries among freelancers in Dusseldorf, Germany who have used Unix in their recent projects are Information Technology (88%), Banking and Finance (71%), and Telecommunication (65%).
The most common business areas among freelancers in Dusseldorf, Germany who have used Unix in their recent projects are Information Technology (100%), Product Development (88%), and Project Management (82%).
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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Frankfurt 
Stuttgart 
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Philipp Thomaschewski
FRATCH CEO
