Test Engineer Cellular Devices & Iot (kddi Spherience)
Kddi Spherience AB / Datajobb / Stockholm
2025-09-22
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We are seeking a senior Test Engineer with deep expertise in cellular technologies and IoT devices to join our growing global Operations team. In this role, you will design and execute test cases, validate end-to-end connectivity, and support device certification during customer implementation phases. You will play a critical role in ensuring that cellular devices, SIMs, and platforms behave reliably across multiple radio access technologies (2G/3G/4G/5G/5G SA), while collaborating closely with global partners, mobile network operators, and enterprise customers.
This is an exciting opportunity to influence how testing is structured in a fast-growing team and contribute directly to the success of connected mobility programs worldwide.
About KDDI
We are a global Top 10 telecommunications pioneer and a Global Fortune 500 company providing our international customer base with data centers, networks, content delivery, system integration, and more. We connect vehicles from several of the world's largest Automotive OEMs, as well as mobility and IoT programs across the globe. Our industry-leading Telehouse data center provides colocation at over 40 sites in 23 cities across 12 countries, including London, New York, Frankfurt, and Shanghai. Leveraging our strengths as a telecom provider, we combine IT and network expertise to deliver secure, scalable, and stress-free connectivity for our customers.
Responsibilities
Review Statements of Work (SOWs) and technical documents to derive end-to-end test plans.
Develop, execute, and document test cases covering:
RAT selection and handover
eSIM profile activation and fallback (SGP.22 / SGP.32)
Attach/detach, PDP context activation, roaming scenarios
Voice (VoLTE/VoNR/eCall) and data session validation
Manage internal and external test activities with customers, MNO partners, and third-party labs.
Act as single point of contact for defect reporting, root cause analysis, and troubleshooting across device, SIM, and network layers.
Capture and analyze device and network traces using tools such as QXDM, QCAT, Wireshark, AT commands.
Share knowledge gained from testing with internal project and operations teams to ensure smooth launches.
Support device certification activities (e.g., GCF/PTCRB, operator IOT testing).
Identify opportunities to automate recurring test procedures and improve efficiency.
Stay current on emerging technologies (5G SA, NTN, private networks) and incorporate into test strategies.
Knowledge and Skills
Technical Skills
Strong knowledge of Wireless, Cellular 4G/5G (NSA & SA), RAT mobility, VoLTE/VoNR
Solid understanding of eSIM/eUICC, SGP.22/SGP.32 flows, and SIM lifecycle
Familiarity with Packet Core, APNs, IP networking, DNS, VPN/IPsec
Hands-on experience with test tools: QXDM, QCAT, Wireshark, AT command interface
Exposure to IoT services, cloud/virtualization, and API-driven environments preferred
Soft Skills
Excellent written and verbal communication skills, able to explain complex technical findings clearly
Strong analytical mindset and structured approach to problem-solving
Collaborative, customer-focused, and comfortable working with international stakeholders
Proactive, detail-oriented, and committed to quality and timely delivery
Requirements
Bachelor's degree in Telecommunications, Computer Science, Engineering, or related field (or equivalent experience)
5+ years of hands-on experience in device and network testing (cellular / IoT / automotive preferred)
Proven experience with multi-RAT device testing, roaming validation, and SIM/eSIM integration
Familiarity with operator certification processes (IOT), GCF/PTCRB conformance is an advantage
Ability to work independently and manage multiple priorities in a fast-paced, global environment
Join Us
Joining KDDI Spherience as a Test Engineer offers an exciting opportunity to work with cutting-edge IoT, telecom, and connected mobility technologies. If you are a motivated professional with a passion for cellular device testing and delivering high-quality solutions, we encourage you to apply.
Så ansöker du Sista dag att ansöka är 2025-10-22
E-post:
j.malmqvist@kddia.com Arbetsgivarens referens Arbetsgivarens referens för detta jobb är "Test Engineer".
Omfattning Detta är ett heltidsjobb.
Arbetsgivare Kddi Spherience AB (org.nr 559471-5020),
https://spherience.io/ Lindetorpsvägen 25 (
visa karta)
121 63 JOHANNESHOV
Jobbnummer 9519299