TCP/IP Expert in Düsseldorf
to connect reliable systems with vetted, available freelancersHire experts who design and troubleshoot IP networks, routing, DNS, DHCP and secure remote connections across enterprise and cloud environments. FRATCH matches you quickly and precisely with vetted, available freelancers suited to your technical needs.
Meet FRATCH Experts in Düsseldorf, who have recently used TCP/IP
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
Hisham E.
Last position:
System Engineer Network & Security at Isringhausen GmbH
- Operation, maintenance and administration of the global network & security system landscape
- Troubleshooting and support in 2nd & 3rd levels and provide technical advice to other dept.
- Configuration of complex LAN/WAN/SD-WAN and WLAN network infrastructures (N5K, N9K, ASR 8000, Wireless Controller WLC9800, AP C91xx and VMware Velo Cloud)
- Control of external service providers as part of service and escalation management
- Implementation and monitoring of system updates (software upgrades, minor/major changes)
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
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
Alois G.
Last position:
Bank DZ Privatbank S.A.
- Various programming tasks as specified
- Work carried out from home office, meetings/tasks via email, phone and Microsoft Teams
- Version control via GIT
- Implementation with RDI, FreeSQL SQL
- Extension of automatic test environment creation as specified - adding automatic transfer of existing iSeries users and preparation as well as anonymization of test data
- Creation of trigger and service programs in SQLRPGLE, FreeRPG, ILE RPG and CLLE
- Development and implementation of the CallKredite project including additional extensions for other departments
- Conversion of RPG to Free-RPG and SQL as well as extension of existing modules as specified
- Migration to a new banking release
- Support for specialist segment / OIV
Jürgen S.
Last position:
IT Consultant / Analyst / Developer / Tester / Support at Automotive Manufacturer
- Analysis, software development/customization, and testing of various transaction and batch objects
- Conducting functional integration and regression tests on TEST and QA platforms under z/OS for later production implementation
- Hardware / Software / Tools: IBM MVS, z/OS, JES2/3, TSO-ISPF, JCL, DB2, SQL, SQL/PL, QMF, QMF for Workstations, SPUFI, FileAid, IMS-DB/DC, MFS, XPEDITER, COBOL, REXX, Windows 10, MS Office 365, MS Teams, batch job management via OPC, BETA92, RVS, BVB, ABL, DIALOGplus, PROBA, PRODPR (VW internal systems), JIRA, CONFLUENCE
Esmail S.
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
Jonas S.
Last position:
Subproject Manager / Consultant – d.3 DMS Solution Implementation at InterRisk Versicherungs-AG
- Planning the migration of the legacy archive to the new d.velop-documents platform
- Managing external service providers and internal project stakeholders
- Connecting existing systems to d.velop documents
- Project planning, control and reporting
Yan O.
Last position:
Software Developer (C++, Python) at Vaillant Heizsysteme
- Implemented communication between heating system modules via the SOME/IP interface in C++
- Developed additional software components in C++
- Executed unit tests and integration tests in the GitLab CI workflow
- Set up desktop publishing functionality
- Tools: C++, Python, Linux, Robot Framework
Humayun S.
Last position:
Test Manager at ProSiebenSat.1 Media SE
- Quality assurance for 7 apps and websites as well as Galileo
- Designing, planning and executing tests
- Designing the test strategy in an agile team
- Planning, monitoring and coordinating test activities
- Reviewing and matching test cases
- Documenting test results
- Reviewing found defects
- Collaborating with developers
- Conducting regression tests
- Creating test summary reports
- Participating in various meetings with all stakeholders
- Approach, tools & systems: Jira, Android Studio, iOS, Android, Agile-Scrum
Heinz-Dieter L.
Last position:
Consultant at CH Crypto Group
- Advice on governance and information security topics: BAIT, MaRisk
- Creating governance documents (policies, guidelines)
- Developing emergency manuals
- Based on BSI IT baseline protection standard 200-4 and ISO2700x
Yvonne S.
Last position:
Senior Management Consultant at Scillcon GmbH
Discover over 15,000 top freelancers
Statistics of experts using TCP/IP
Aggregated from the professional profiles of matched freelancers.
Experience
29 years (Germany: 26 years)
Position duration
2.7 years (Germany: 3.2 years)
Positions per freelancer
18 (Germany: 19)
Top business areas
Information Technology, Project Management, Product Development
Top industries
Information Technology, Telecommunication, Automotive
Certification focus areas
Information Technology, Quality Assurance, Operations
Bachelor's degree or higher
57% (Germany: 87%)
Master's degree or higher
29% (Germany: 54%)
Certifications per freelancer
5 (Germany: 3)
Most common languages
German, English, Arabic
Speak two or more languages
83% (Germany: 99%)
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 TCP/IP
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.
TCP/IP 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 (75%)
- Telecommunication (67%)
- Automotive (50%)
- Manufacturing (50%)
- Government and Administration (50%)
- Energy (42%)
- Transportation (42%)
- Professional Services (42%)
Please note that freelancers can work across multiple industries, so percentages overlap.
About the technology
What TCP/IP is
TCP/IP is the Internet protocol suite that enables devices, applications and networks to exchange data. Transmission Control Protocol manages reliable delivery, while Internet Protocol addresses and routes packets across connected networks. Together, these protocols support websites, APIs, cloud services, email and business communications.
Core responsibilities
TCP/IP work covers the design, operation and diagnosis of network communication from local segments to global infrastructure. Specialists define addressing plans, subnetting, routing paths and transport behaviour, then verify that systems remain reachable, secure and resilient under changing traffic conditions. They also trace packet loss, latency and connection failures across multiple network layers.
Ecosystem and tooling
The TCP/IP suite works alongside Ethernet, Wi-Fi, IPv4, IPv6, TCP, UDP, DNS, DHCP, HTTP and TLS. Strong specialists use command-line tools such as ping, traceroute, ip, ss and tcpdump, plus packet analysis with Wireshark. They may also work with firewalls, load balancers, VPN gateways, network monitoring, Linux, Windows Server and cloud networking services.
Where companies use it
- Connecting offices, data centres, cloud environments and remote users
- Supporting web applications, APIs, databases and VoIP services
- Building segmented networks with controlled routing and firewall rules
- Migrating services from IPv4-only designs toward IPv6 readiness
- Investigating outages, slow connections and intermittent reachability
TCP/IP is present in nearly every modern business system, from industrial connectivity and logistics to financial services, healthcare and media platforms. In Düsseldorf, specialists may support local enterprise environments while collaborating remotely with teams in other regions.
When freelance expertise helps
Companies bring in freelance TCP/IP specialists during network migrations, cloud adoption, data-centre changes, security reviews and major incident response. External expertise is also useful when internal teams need an independent design review or must resolve faults that cross application, operating-system and network boundaries. A clear scope should define sites, systems, protocols, access requirements and expected deliverables.
What strong specialists deliver
Good professionals explain network behaviour in practical terms and validate assumptions with packet captures, logs and repeatable tests. They understand both theory and operations, including addressing, routing, name resolution, transport performance and security controls. Their deliverables can include network diagrams, configuration changes, troubleshooting reports, migration plans, monitoring rules and concise handover documentation.
Frequently asked questions
Need clarity? These are the questions we hear most often about TCP/IP.
TCP/IP connects devices and enables applications to exchange data across local networks, the internet and private infrastructure. Companies rely on it for websites, APIs, cloud services, email, remote access, databases and voice or video communication.
TCP/IP is a broad protocol suite rather than a single transport method. TCP prioritizes ordered, reliable delivery, while UDP reduces overhead for use cases such as streaming, DNS and real-time communication; the right choice depends on latency, reliability and application design.
TCP/IP work often requires knowledge of DNS, DHCP, IPv4, IPv6, routing, firewalls, VPNs and network monitoring. Experience with Linux or Windows Server, cloud networking, Wireshark and security controls is also valuable when problems cross several system layers.
TCP/IP projects need a specialist whose background matches the network scope and risk. A contained troubleshooting task may need focused protocol knowledge, while a multi-site migration or cloud redesign calls for proven work with routing, security, documentation and change control.
TCP/IP work can often be delivered remotely through secure access, packet captures, monitoring data and carefully planned maintenance windows. On-site support may still matter for cabling, hardware, physical connectivity or facilities where remote access is unavailable; teams should agree on access and communication expectations early.
TCP/IP quality shows in structured diagnosis, clear evidence and controlled changes. Ask the specialist to explain how they isolate packet loss, routing errors, DNS failures and firewall blocks, then review sample diagrams, test plans and handover documentation.
TCP/IP expertise may include both IPv4 and IPv6, but not every specialist has equal production experience with IPv6. Ask about dual-stack design, address planning, routing, DNS records, firewall policies and migration testing if IPv6 is part of the project.
TCP/IP assignments with companies in Düsseldorf may involve office networks, industrial systems, cloud connectivity or security-sensitive infrastructure. Remote collaboration is common, but professionals should clarify documentation language, maintenance windows, access procedures and whether occasional on-site work is expected.
The average hourly rate of freelancers in Dusseldorf, Germany who have used TCP/IP in their recent projects is 90 €, which corresponds to a daily rate of about 721 € based on an 8-hour working day.
Of the freelancers in Dusseldorf, Germany who have used TCP/IP in their recent projects, 57% hold at least a Bachelor's degree and 29% hold at least a Master's degree.
On average, freelancers in Dusseldorf, Germany who have used TCP/IP in their recent projects have 29 years of professional experience, with a single engagement typically lasting around 2.7 years.
The most common languages among freelancers in Dusseldorf, Germany who have used TCP/IP in their recent projects are German (100%), English (83%), and Arabic (8%).
The most common industries among freelancers in Dusseldorf, Germany who have used TCP/IP in their recent projects are Information Technology (75%), Telecommunication (67%), and Automotive (50%).
The most common business areas among freelancers in Dusseldorf, Germany who have used TCP/IP in their recent projects are Information Technology (92%), Project Management (67%), and Product Development (58%).
Main locations of FRATCH Experts, who have recently used TCP/IP
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 Request a free demo
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Philipp Thomaschewski
FRATCH CEO
