Inteligencia Artificial jobs in Spain

Full-Stack Developer (AWS | React | MongoDB | Pinecone | AI) – Onsite in Cádiz, Spain (Spain)

Siteware is a leading German AI SaaS platform, enabling companies to build and operate productive AI agents without coding—from chat agents to phone / voice bots to task agents. Core components include our app marketplace, an agent builder, model orchestration (e.g., ChatGPT, Gemini, Claude, DALL E, Midjourney), as well as our proprietary technologies DMSP – Dynamic Multi Step Prompting and SiteCore for quality assurance of knowledge data. Data protection is our top priority: GDPR-compliant, EU servers, and our own trust center.

Why Cádiz, Spain ?

We are expanding our engineering presence in the Málaga area (Our Office is in Cádiz, Spain) — one of Europe’s most dynamic tech hubs with Málaga TechPark and a new Google Security Engineering Center (GSEC) in the city. This allows you to work in an environment with a high density of top talents, excellent quality of life, and strong infrastructure.

You will develop core functionalities of our AI platform and work onsite in Cádiz, Spain , shoulder to shoulder daily with our lead developer & co-founder—short distances, quick decisions, maximum impact.

We are not looking for titles but for innovators. Experience is a plus—what counts is your drive :

• You are excited about Siteware and AI, try things out, study topics, build prototypes.
• You enjoy diving into new subjects (RAG, Pinecone, n8n, telephony, eval frameworks—whatever comes up).
• You tinker and find ways even when requirements are unclear.
• You take ownership, don’t give up, measure outcomes, and improve them.

If this speaks to you, apply even if you don’t (yet) meet all technical points.

• End-to-end product development : New features for agent builder & app marketplace, scalable APIs, MCPs, and custom integrations.
• AI in production : Building RAG pipelines including vector search (Pinecone) and prompt-stable flows; fine-tuning appropriate models and systematic prompt evaluation.
• Automation : Designing and operating robust workflows (with Siteware directly, make & n8n self-hosted), event / job orchestration, in-app communication, webhooks.
• Voice & telephony : Integrating our voice / phone agents with telephony / SIP providers, transcription / TTS services.
• Security & compliance : Privacy-by-design, logging, observability, and cost control for multi-model setups (tokens).

• Frontend : React (TypeScript), Next.js, Zustand / Redux, Vite; UI with design system.
• Backend : Node.js / TypeScript (NestJS / Express), GraphQL / REST, WebSockets.
• Data & AI : MongoDB (Atlas), Pinecone (or Weaviate / pgvector), LangChain / LlamaIndex, embeddings & fine-tuning pipelines.
• Cloud & DevOps : AWS (ECS / EKS or Fargate, Lambda, S3, CloudFront, API Gateway, SQS / SNS), Docker, Terraform / CDK, GitHub Actions.
• Automation : Siteware, make & n8n (self-hosted), cron / queues, secrets management (AWS Secrets Manager).

Note: Our platform integrates several leading models in one account and delivers them GDPR-compliantly.)

• 4+ years full-stack (React / TypeScript + Node.js) in production SaaS systems.
• Deep AWS experience (infrastructure as code, containers / Lambda, monitoring).
• MongoDB in production (schema design, performance, indexes).
• Vector databases & RAG (preferably Pinecone) – from chunking to retrieval tuning.
• Prompt engineering & AI model fine-tuning (open source or API models, evaluation).
• Automation with make and / or n8n (flows, error handling, idempotency).
• Onsite mindset : willingness to work closely onsite in Cádiz, Spain with the co-founder / lead engineer (not a pure remote role).

• Experience with telephony / SIP, STT / TTS (e.g., Twilio / Plivo, Whisper, ElevenLabs).
• Knowledge of Claude, Gemini, OpenAI APIs, tools like LangSmith / Promptfoo.
• Data pipelines (Airbyte / dbt), OpenTelemetry, SSO / OAuth, rate limiting, cost budgets.
• German or Spanish; fluent English spoken and written.

• Product with traction : From chat to phone agents—real business processes, no lab project.
• Ownership & speed : Direct access to the co-founder, fast releases, clear impact.
• Privacy “made in Germany” : GDPR-compliant platform, EU servers, trust center.
• Learning budget & hardware choice, modern tools, peer reviews, CI / CD.
• Location advantage Málaga-Area : Working in a European AI / cybersecurity hotspot with a strong community (GSEC, Málaga TechPark).
• Attractive, fair salary (market-level), good growth prospects, flexible start dates.

• Primarily onsite : 11311 Guadiaro, Cádiz, Spanien (Spain).
• Close collaboration with our lead developer & co-founder—pairing, architecture sessions, joint customer demos.
• Optional occasional travel to Germany (customer meetings / team offsites).

Send us your resume, GitHub / portfolio, and 2–3 short bullet points about an AI project (role, stack, impact) via our contact page (navigation “Contact”) or directly via the support / sales contact on the website. Subject : “Full-Stack Cádiz .”

1. 30-minute personal introduction (product & role) with founder Andreas Jansen
2. 75-minute tech talk with a small code walkthrough (no Leetcode) with technical lead and co-founder
3. 1 month meet & build remote with the co-founder (architecture session & pairing) with technical lead and co-founder
4. Meet & build onsite with the co-founder (architecture session & pairing) with technical lead and co-founder
5. After 2 to 4 months : offer for permanent employment from Siteware GmbH