Freelance System Engineer – Network and Communication Systems

Project overview

Hello everyone,

for one of our clients in the defense sector, we are looking for an experienced Systems Engineer (m/f/d) with a focus on network architecture, requirements engineering, and communication systems.

As part of a challenging project in the area of secure, mission-critical communication, you will be responsible for the conception and further development of the network architecture of a modern communication platform.

The focus is on system architecture, deriving technical requirements, defining interfaces, and developing security and communication concepts.

The platform is based on a cloud-native Kubernetes environment and distributed embedded systems.

Responsibilities

Conception and further development of the system and network architecture for complex communication systems

Derivation and specification of system and subsystem requirements from business and technical requirements

Execution of requirements engineering, including end-to-end traceability of requirements to tests

Creation, coordination, and documentation of interface control documents (ICDs)

Development of network architectures for IP-based communication systems

Conception of communication authorizations, role, and policy models

Development of security, segmentation, and prioritization concepts

Definition of test and verification strategies at the system level and corresponding acceptance criteria

Coordination of technical requirements and architectural decisions with development teams and external partners

Ensuring the technical feasibility of system requirements in cloud-native and embedded environments

Requirements (Must-have)

Several years of professional experience in Systems Engineering, ideally at least 5 years

Sound knowledge in requirements engineering and the derivation of system and subsystem requirements

Experience with end-to-end traceability of requirements to verification

Experience in creating and coordinating interface control documents (ICDs)

Sound knowledge in the architecture of IP-based networks (IPv4/IPv6, routing, addressing, network segmentation)

Experience with the conception of communication authorizations, role, and policy models

Knowledge in the development of test and verification strategies at the system level

Basic understanding of cloud-native architectures, especially Kubernetes, microservices, and CI/CD

Willingness to undergo security screening according to SÜG (Ü2, possibly Ü3)

Very good German and good English skills

Desirable Knowledge (Nice-to-have)

Model-Based Systems Engineering (MBSE), SysML, Cameo, or Capella

Software Defined Networking (SDN), Control and Data Plane

Network architectures with changing topologies, mesh networks, and Delay Tolerant Networking (DTN)

Tactical or military communication systems

Network management according to FCAPS

Network simulation and emulation with ns-3 or Containerlab

Hardware-in-the-Loop (HIL) and Software-in-the-Loop (SIL)

Basic programming skills in C++, Go, or Python

Experience with embedded systems and resource-constrained platforms

Project experience in defense, aviation, or critical infrastructure

Experience in complex projects with multiple development teams and external suppliers

If interested, I look forward to receiving your CV and your hourly rate. If suitable, we will gladly arrange an appointment to discuss the details!

Best regards,

Florian Gaudchau

Project details

November / December 2026

6 months (extension very likely)

Bremen / Hybrid

On-site: 3 days per week (Tuesday, Wednesday, Thursday)

Monday and Friday

• Start: 2026-11
• Duration: 6 Monate
• Remote: hybrid
• Location: Bremen, Deutschland, DE
• Languages: German