At HeyDiga we build conversational AI agents that answer the phone and WhatsApp for service businesses in Spain, Italy and France. Our product is called SONIA, and we don't sell it as software: she's a virtual employee who picks up calls, manages appointments, answers questions and never leaves a call unanswered. We work with hair salons, beauty centres, car repair shops, restaurants and clinics. Behind every call there's a full machine learning pipeline: automatic speech recognition (ASR), an LLM that reasons and makes decisions, and text-to-speech (TTS). Your job is to make SONIA not just talk and reason well, but do it fast and reliably across thousands of real calls and WhatsApp conversations every month. No demos: what you build goes to production and a real customer hears it. design, build and operate the APIs and services in TypeScript (Node.js / Bun) that power real-time voice conversations — scalable, reliable and secure, because every failure is a call nobody answers. integrate and orchestrate LLMs, STT and TTS (OpenAI, Whisper, ElevenLabs and our own models) — streaming, caching, fallbacks, prompt versioning and voice edge cases such as retries on failed transcriptions, fallback voices and latency budgets. build with React and Tailwind the surfaces our customers and internal team use — dashboards, analytics and agent configuration tooling. cloud (AWS/GCP), deployment pipelines, monitoring,



token-usage tracking and logging for real-time voice processing. Quality and technical judgement: clean architecture, DDD, hexagonal design, auth/authz, rate limiting and tests where they really matter. You will work directly with the founders, ship to production daily and have a real say in how the product, the platform and the team evolve. of production experience with modern web stacks. AI coding agents (Claude Code, Cursor, Codex or similar) as a core part of your daily workflow — not as an occasional helper — and you understand how they work under the hood: tokens, context windows, sub-agents, tools and orchestration. relational databases, SQL and data modelling ; Docker and can set up a sensible testing strategy (Jest, Cypress or similar). Autonomous, pragmatic and product-minded: comfortable with ambiguity and able to ship fast without sacrificing quality. Spanish and English , Polyglot backend: Python, Go, Ruby or Java . System design and DevOps: microservices, API security, CI/CD, observability (Datadog, Sentry, PostHog). Node.js, Bun Frontend: React, Tailwind CSS Data: relational databases (SQL) Infra & DevOps: Docker, AWS / GCP, CI/CD Meaningful equity in an early-stage, venture-backed company. Work side by side with senior founders who have built and scaled top Spanish tech companies. An AI-native engineering culture: we don't just build AI, we use it intensively to build faster and better. #

📌 Senior Software (España)
🏢 heydiga
📍 España