Telephony Engineer - Spain

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About this role

Telephony Engineer - Spain Spain About HappyRobot HappyRobot is the AI-native operating system for the real economy-a system that closes the circuit between intelligence and action. By combining real-time truth, specialized AI workers, and an orchestrating intelligence, we help enterprises run complex, mission-critical operations with true autonomy. Our AI OS compounds knowledge, optimizes at every level, and evolves over time. We're starting with supply chain and industrial-scale operations, where resilience, speed, and continuous improvement matter most-freeing humans to focus on strategy, creativity, and other high-value tasks. You can learn more about our vision in our Manifesto. HappyRobot has raised $62M to date, including our last $44M Series B in September 2025. Our investors include Y Combinator (YC), Andreessen Horowitz (a16z), and Base10-partners who believe in our mission to redefine how enterprises operate. We're channeling this investment into building a world-class team: people with relentless drive, sharp problem-solving skills, and the passion to push limits in a fast-paced, high-intensity environment. If this resonates, you belong at HappyRobot. About the Role We're looking for a Telephony Engineer based in Madrid to own and scale the real-time voice infrastructure that powers HappyRobot's AI workers across Europe. You'll be the go-to person for everything telephony on this side of the Atlantic-from SIP trunking and SBC configuration to CCaaS integrations and network troubleshooting. Our European client base is growing fast across large-scale logistics, telcos, and enterprise operations, and we need someone who can deploy, debug, and evolve our voice infrastructure with the same speed and

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