Job Description

The Optical Networks System & Automation group develops pluggable transceiver modules for coherent optical fiber transmission. The applications include Communication Service Provider (CSP) network node as well as intra and inter data center connections. Our team is part of a module development team comprising hardware development, full custom ASIC (Application-Specific Integrated Circuits) design, experts for optical components and firmware (FW) development. We are closely working together with all functions required from the product definition to manufacturing.


We are expanding our FW team and looking for highly motivated engineers to join us in developing the next generations of transmission systems. The FW team is responsible for designing, integrating, and verifying all software parts required for an optical coherent transceiver module. This includes software targeting a complex multi-processor system embedded in custom hardware, low level driver software, algorithms controlling optical components and the digital signal processor, higher layer control software and the management interface application.



Independent development of DSP / ARM embedded software using a Real Time Operating System (RTOS). Implement and validate the code, document the test results including creation of automated test. Work in interdisciplinary teams (HW (hardware), ASIC (Application-Specific Integrated Circuits), optics, factory). Cover systems engineering aspects and documentation (collect and understand features and dependencies / impact; work out feature implementation details; define SW UG (software user guide); interface to SW). Increase the quality of our code by extending the test framework and adding test cases for our CI/CD pipeline (continuous integration and continues delivery). Provide automation solutions (e.g. Jenkins, Python). Understand the various functional areas: + Device drivers and link drivers including PL Ls (Phase-Locked Loops)
+ Control concepts for optical devices including stability analysis
+ DSP (Digital Signal Processing) configuration in the field of coherent optical communication
+ High-speed ADC (Analog-to-Digital Converter)/ DAC (Digital-to-Analog Converter) configuration and control
+ Various protocols used in the field of coherent optical communication

Must have:

Master degree in electrical engineering / computer science / computer engineering or a related field (or Bachelor Degree with + 5 years of experience). Fluent in English language (spoken and written) and intermediate in German language (spoken and written, at least B1- B2 preferred with the aim to become fluent). Experience with Python. Profound knowledge of C programming language and knowledge of C++. Experience with revision control systems (e.g., Git & Gerrit, Bitbucket) . Very good analytical way of thinking and good communication skills with ability to work independently and self-organized.

Nice to have:

Profound knowledge of embedded programming concepts. Experience with Eclipse based IDE (Integrated Development Environment) or Visual Studio Code. Experience with advanced control loop theory and communications theory. Knowledge of coherent optical communication systems and signal processing. Knowledge of OTN (Optical Transport Network)/OCH (Optical Channel) and/or GBE (Gigabit Ethernet) frame structure. Knowledge of system theory for optical communication systems. Experience in feedback control systems and digital signal processing. Knowledge of components for optical transmission (laser, EDFA, MZM, …). Collaboration with multi-site, cross-functional, international teams. Flexibility and ability to cope with project pressure.

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About the Business Group

A robust digital backbone is the unsung hero of modern life, underpinning everything from daily interactions to cloud computing and critical infrastructure. The Network Infrastructure team is passionate about pushing the boundaries of what's possible in networking, tackling the toughest challenges and delivering innovative solutions.



We deliver trusted, purpose-built IP, optical, fixed, and data center solutions that power the internet, drive the global economy, and support the mission-critical industries that keep the world running.

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If you’re interested in this role but don’t meet every listed requirement, we still encourage you to apply. Unique backgrounds, perspectives, and experiences enrich our teams, and you may be just the right candidate for this or another opportunity.



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