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Wearables Connectivity (Engineering Labs) Team Network Infrastructure & Labs - Cellular Connectivity Role Overview We are seeking a Cellular-DevOps Engineer to join our Wearables Cellular team within Engineering Labs. This role sits at the intersection of public and private 5G/LTE cellular network engineering and DevOps automation , supporting the development and testing of next-generation wearable devices with cellular connectivity. You will be responsible for building, operating, and automating the infrastructure that enables end-to-end cellular testing - from RF signal path optimization and modem provisioning to CI/CD pipeline integration and automated IP management services. This is a hands-on engineering role that requires both hardware lab familiarity and strong software/automation skills.
Key Responsibilities Cellular & RF Engineering (40%) • Private 5G/LTE Network Operations : Configure and maintain small-cell/callbox infrastructure supporting NR SA, LTE, and NR-RedCap across multiple frequency bands (n2, n5, n25, n66, B2, B5, B66) • RF Signal Path Management : Optimize RSRP/RSRQ/SINR measurements in shielded test environments; troubleshoot signal path issues including cabling, attenuation, and antenna configuration • Device Modem Provisioning : Manage modem calibration file provisioning, EFS (Embedded File System) operations, QMI/DIAG interfaces, and modem mode configuration • Cellular E2E Test Execution : Run and validate NR attach/detach cycles, data path verification (ping/DNS/iperf3), GNSS integration, and multi-RAT connectivity scenarios • Hardware Lab Operations : Stage and pair devices in shield boxes, manage rack equipment mapping, coordinate with callbox vendors, and maintain reference device baselines
DevOps & Automation (40%): • CI/CD Pipeline Integration : Configure and maintain automated test lanes - both blocking and non-blocking - for cellular test suites within continuous integration frameworks • Infrastructure-as-Code : Manage network ACLs, network configuration pushes, proxy filters, and DNS automation pipelines • Service Development (Python) : Build and maintain automated services such as IP management pipelines (static routing, DNS verification, asset tagging, batch processing) • Database & State Management : Administer MySQL databases, schema migrations, configuration management systems, and service state stores • Monitoring & Observability : Instrument services with time-series metrics, manage alerting thresholds, respond to health alerts, and track SLA compliance • Inventory & Asset Management : Extend and maintain device inventory systems - CLI tools, reservation workflows, and device registration pipelines
Test Framework & Tooling (20%): • E2E Test Development : Author config-driven cellular E2E tests (JavaScript/Jest) covering LTE, NR SA, NR-RedCap, and attach/detach scenarios • Callbox Integration Tooling : Develop and maintain Python/Thrift bridges for callbox queries and control RPCs • Modem Utility Libraries : Contribute to shared libraries for device-side modem management (mode switching, airplane mode, cellular measurements) • Lab Network Tooling : Build and maintain lab network management features (PoE control, port management, VLAN allocation)
Required Qualifications: • 3+ years of experience in cellular/wireless engineering, DevOps, or a combined infrastructure role • Private cellular network experience : Hands-on with 4G LTE and/or 5G NR - including cell planning, RF measurements (RSRP, RSRQ, SINR), and UE attach/registration flows • Programming proficiency : Python (primary) with working knowledge of JavaScript; ability to write production services and test automation • Linux systems administration : Comfortable with shell scripting, systemd services, networking (VLANs, static routing, iptables/nftables), and embedded device interaction (adb, fastboot, serial) • Infrastructure automation : Experience with at least two of: CI/CD pipelines, Infrastructure-as-Code, configuration management, database administration, or monitoring systems • Debugging mindset : Ability to troubleshoot across the full stack - from RF signal levels and modem firmware to service RPCs and database queries
Preferred Qualifications: • Experience with Amarisoft or similar small-cell/callbox platforms (Keysight, R&S) • Familiarity with Qualcomm modem tooling (QXDM, QMI, DIAG, NV item provisioning, EFS management) • Exposure to wearable/IoT device development or testing • Experience with Thrift/gRPC service development and service mesh architectures • Knowledge of MCTP/NCSI or other baseboard management protocols • Background in test automation frameworks (Jest, pytest, or similar) • Familiarity with network security tooling (ACL generation, firewall policy management) • Experience operating shielded/anechoic test environments
Sprachkenntnisse
- English
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