Modem System Test Engineer, 6G/5G Air Interface

We are seeking a motivated engineer to join the Modem System Test (MST) team in Tokyo. In this role, you will contribute to building next-generation wireless technologies including 5G NR and emerging 6G systems, with opportunities to apply AI/ML techniques to end products and engineering workflows. You will work closely with cross-functional teams, including software development, system design, hardware design, and RF design, to integrate, test, characterize, certify, and commercialize 6G/5G modem products for global markets.

You will directly impact the quality, performance, and commercialization of global modem products, enabling cutting-edge wireless experiences across mobile devices and networks. The ideal candidate is curious about emerging technologies, eager to learn, and comfortable working in a collaborative technical environment. Strong communication and interpersonal skills are essential, along with a proactive, hands-on approach to testing and lab-based work.

Key Responsibilities

You will support verification and performance evaluation for complex digital modem products across 6G and 5G cellular technologies in carrier lab mainly, infra vendor lab, field and with test equipment like protocol simulator. Core responsibilities include:

• 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, optimizing 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 robust 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.

Minimum Qualifications

3+ years System Test Engineering experience in 5G/4G mobile communications system, protocols, or related work experience.

Preferred Qualifications

• 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, Perl and MATLAB.
• Knowledge of AI/ML concepts and their application to digital communications is a plus.
• Proficient communication and reporting skills
• Speaking Japanese and English is required at operator lab

Minimum Qualifications

• Bachelor's degree in Engineering, Information Systems, Computer Science, or related field.

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