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Summary: This role involves building AI-powered solutions, collaborating with a key client, and integrating modern AI tools to enhance product capabilities. Highlights: 1. Build and ship features across the stack, with a backend focus 2. Integrate and experiment with modern AI tools 3. Varied role mixing product work with real client impact **Fullstack Developer (AI\-Focused) — Madrid \| Hybrid** At Tendios, we build AI\-powered solutions that help our clients move faster and smarter. We're growing — and we're looking for a Fullstack Developer to join us in Madrid and work hand\-in\-hand with one of our key clients in the city. **The role** You'll split your time between Tendios and a client engagement in Madrid (2–4 days per week on\-site with the client, the rest hybrid with our team). You won't just be writing code — you'll be the bridge between our product expertise and the client's day\-to\-day needs, helping them get the most out of our platform and AI tooling. **What you'll do** * Build and ship features across our stack — heavier on the backend, with some frontend work when needed * Design and evolve APIs, services, and data models that power AI\-driven workflows * Work directly with a client in Madrid: understanding their problems, proposing solutions, and delivering them * Integrate and experiment with modern AI tools (LLM APIs, agentic workflows, RAG, etc.) to push what our product can do * Collaborate with our team remotely on architecture, code reviews, and product direction **What we're looking for** * Solid experience with **Node.js / TypeScript** on the backend * Comfortable with **Vue** on the frontend (you don't need to be a CSS wizard, but you should be able to ship a clean UI) * Working knowledge of both **SQL and NoSQL** databases — you understand when to use which and why * Hands\-on experience with **AI tools and LLM APIs** (Claude, OpenAI, or similar) — prompt engineering, function calling, and basic agentic patterns * A pragmatic mindset: you ship, you iterate, you talk to users * Based in Madrid (or willing to relocate) and comfortable working on\-site with a client part of the week * Fluent in English; Spanish is a strong plus given the client context **Nice to have** * Experience consulting or working embedded with a client team * Familiarity with cloud infrastructure (AWS, GCP, or similar) * Interest in AI product development beyond just calling APIs — you've built something with agents, RAG, or evals **What we offer** * A hybrid setup based in Madrid * A varied role that mixes product work at Tendios with real client impact * Direct exposure to cutting\-edge AI tooling — we're not just talking about it, we're building with it * A small, ambitious team where your work is visible and your ideas matter Interested? Send us a quick note and your CV — we read every application. A few notes on choices I made: * **No seniority label** as you requested, but the phrasing ("solid experience," "hands\-on," "working knowledge") naturally filters for junior\-to\-mid without scaring off the right people or attracting overpaid seniors. * **No salary listed** — common on LinkedIn for this band, and it gives you negotiation room. If you want to include it (LinkedIn does boost visibility for posts with salary), I'd suggest "€30,000–€35,000 \+ benefits" or just "Competitive." * **Spanish framed as "strong plus"** rather than required — broadens the pool slightly while signaling it matters for the client work. * I leaned into the **consulting/client angle** since that's the differentiator: it makes the role sound more interesting than a typical dev seat, which helps justify the salary band.
