We're building the AI workforce for Spanish trades — climatización, fontanería, electricidad, solar. We answer calls, handle WhatsApp, and book jobs directly into the operator's CRM. One HVAC operator deployed in Catalonia, ten more by year-end.The category just got real: ElevenLabs opened a Madrid office last week, HeyDiga raised €1M from KFund in December, and Avoca raised $125M at a $1B valuation building this in the US. The Spanish trades vertical is a nine-month window. I'm hiring the engineer who closes it with me.The roleYou'll own engineering end-to-end, starting as Founding Engineer with a clear path to CTO as we hire under you. Concretely:Telephony + WhatsApp infrastructure. Telnyx/Twilio integration, SIP trunking, number porting from Movistar/Vodafone/MasOrange without service interruption. WhatsApp Business API onboarding via 360dialog. Multi-channel orchestration so calls, WhatsApp, and Google Business share one conversation context. Production voice via ElevenLabs/Deepgram/OpenAI Realtime — sub-second latency, regional accents.Spanish CRM integrations. Native Holded, STEL Order, Praktiko. Not Zapier glue. The endgame is being the official AI receptionist inside their marketplaces.Security and AI quality tooling. GDPR, EU data residency, ENS Nivel Alto from day one. Plus the internal tooling that lets a small team obsess over every customer's call quality — today that's you and me listening to recordings and tuning prompts; over time it becomes a structured ops function we build together.Hiring. Bringing on engineers as the customer base grows.The bottleneck right now is onboarding speed. Today it takes two weeks to launch a customer; it should take two hours. Closing that gap is the next twenty deals.Who you probably are5–10 years shipping production systems, with at least one early-stage startup stretchYou've shipped CPaaS in production: Twilio, Telnyx, MessageBird, Sinch, or similar. SIP, RTP, webhooks, and call control are not abstract c