Modem System Test Engineer (m/f/d) – 6G/5G Air Interface - Sulzbach am Taunus
Originally posted 17 August 2026 by the employer.
This role focuses on 6G/5G modem products.
About the role
You will work on the commercialization of global modem products, enabling wireless experiences across mobile devices and networks.
What you'll do
- Validate end-to-end system functionality and performance across the cellular protocol stack (PHY, MAC/RLC/PDCP, RRC, NAS, TCP/IP).
- Define modem key performance indicators and evaluate system performance based on data from conducted, radiated, and live 6G/5G network testing.
- Develop and execute system-level test strategies, methodologies, and test plans for modem features and use cases.
- Analyze 3GPP specifications and carrier requirements, translating them into validation scenarios and test coverage.
- Perform log analysis, debugging, and root cause investigation of modem issues across lab and field environments.
- Support feature integration, certification, and commercialization of global wireless products.
What you'll need
- Bachelor's degree in Electrical Engineering, Computer Engineering, Computer Science, or a related field.
- Strong understanding of digital and wireless communication systems, signal processing, and RF propagation.
- Strong understanding of physical layer procedures such as signal detection, channel estimation, link adaptation, mmWave beam refinement, and massive MIMO.
- Knowledge of 5G NR PHY, MAC, RLC, PDCP, and RRC protocols.
- Knowledge of OFDMA, Wi-Fi, and LTE.
- Knowledge of air interface performance analysis, characterization, and optimization.
- Experience with test equipment such as protocol simulator call boxes and channel emulators for wireless product verification.
- Programming skills in Python and MATLAB.
Nice to have
- Exposure to 5G infrastructure vendor-specific 5G NR call flows, including Ericsson, Nokia, Huawei, ZTE, and Samsung.
- Knowledge of AI/ML concepts and their application to digital communications.
Skills: Modem System Test, 6G/5G Air Interface, cellular protocol stack, PHY, wireless communication systems
This role has been open 37 days — below the 44-day median for RF/Wireless Engineering roles.
RF/Wireless Engineering · RF Frontend
|
Open roles in category
262
|
Median days open
44 d
|
Median salary
$166k
|
See the full market breakdown ▾Category comparison, skills in demand, and who else is hiring
| Metric | Qualcomm | All employers we track in this specialty (262 roles · 34 employers) |
|---|---|---|
| Open roles in this specialty | 27 | 262 |
| Open roles in the wider Analog & Mixed-Signal family | 77 | 1349 · 105 employers |
| Median days open | 62 d | 44 d (+18 d vs this employer) |
| Median salary (USD postings) | — | $166k |
Skills observed across this category: Modem System Test, 6G/5G Air Interface, cellular protocol stack, PHY, wireless communication systems
Who's hiring in this category
- QORVO · 47 open roles · median 36 d
- Skyworks · 39 open roles · median 30 d
- Qualcomm (this employer) · 27 open roles · median 62 d
- Keysight Technologies · 22 open roles · median 163 d
- Apple · 20 open roles · median 20 d
- Analog Devices · 13 open roles · median 40 d
How we counted: 262 open RF/Wireless Engineering (RF Frontend) roles from 34 employers tracked in the SemiconductorJobs index, counted 24 Sept 2026. Specialty figures count only roles carrying this exact specialty label, so an employer's related work in neighbouring specialties is not included there — it is counted in the wider Analog & Mixed-Signal family row. Figures refresh nightly.