Wireless Embedded Software Engineer

Embedded Software Engineer Mid-level (L4 equivalent) 2-5 years

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The job description

Tech stack. C, BLE 5.x stacks, Wi-Fi (802.11), Zigbee/Thread, LoRa/LoRaWAN, RF debugging (spectrum analyzer, sniffer), Nordic/Silicon Labs/Espressif SDKs

About the role

You will join a wireless sensor company whose mesh-networked devices monitor infrastructure across cities and industrial sites. The wireless team owns the radio firmware: protocol stacks, mesh routing, and the RF performance that determines whether a thousand-node deployment works or falls apart. This role matters because wireless is unforgiving: you cannot patch physics, and a deployment that works on the bench but fails in a concrete building is a failed product.

What you will achieve

Ship a Thread-based mesh firmware supporting 500+ node networks with 99% end-to-end delivery in real building environments, proven in three pilot deployments, with deployment reports shared across engineering and product
Drive BLE 5.x long-range performance to the link budget limit, achieving reliable connections at 10x the range of the previous generation in open-field testing, documented in the RF performance baseline
Reduce join and commissioning time for new nodes from minutes to under 30 seconds across the full mesh, measured in the 500-node test deployment
Build an RF validation suite (conducted and radiated) that catches antenna and matching regressions before production, integrated into the hardware release gate, with pass/fail criteria agreed with the hardware team
Own coexistence testing against Wi-Fi and other 2.4 GHz interferers, holding packet delivery above 98% in congested spectrum as verified in chamber testing

What you will bring

Must-haves

2-5 years developing wireless firmware on commercial stacks such as BLE, Wi-Fi, Zigbee, Thread, or LoRaWAN
Strong C with a working understanding of RF fundamentals: link budgets, RSSI interpretation, and antenna matching basics
Hands-on experience with at least one vendor wireless SDK such as Nordic nRF Connect, Silicon Labs, or Espressif IDF
Experience debugging wireless issues with sniffers, spectrum analyzers, and protocol analyzers
Knowledge of mesh networking concepts: routing, flooding, sleepy end devices, and commissioning flows
Familiarity with wireless certification processes including FCC, CE, and Bluetooth SIG qualification
Low-power wireless design: connection intervals, advertising strategies, and sleep coordination across the network

Nice-to-haves

Experience with sub-GHz proprietary protocols or LoRaWAN network server integration
Knowledge of Wi-Fi 6 features relevant to IoT such as TWT and BSS coloring
Familiarity with Matter over Thread commissioning and certification