software-defined-modem
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The Modem That Refuses to Stay Put: Hojun Kim’s Bet on Software-Defined Roads
After years designing chips, Hojun Kim is trying to make road infrastructure age more like software: upgradeable, interoperable and ready for the next radio standard.
Ettifos
Ettifos is a South Korea-based, 5G-focused V2X (vehicle-to-everything) company building the communication layer that lets cars, roadside infrastructure, and pedestrians exchange safety and traffic data in real time. Its flagship SIRIUS platform uses a software-defined modem that can switch between LTE-V2X and 5G-V2X with a software update, and its plug-and-play V2X-AIR onboard unit brings standards-compliant connectivity to both new and existing vehicles. Founded in 2018, the company works with partners like Keysight, Autotalks, Audi, and Kapsch TrafficCom, and closed a Series B round in 2025 to scale a C-V2X hardware accelerator chip and expand into U.S. and European markets.