Peak3 is an award-winning vertical SaaS provider, enabling more relevant, convenient, and affordable insurance protection for everyone through our technology and ingenuity. We combine insurance core, distribution, and AI solutions to deliver a step change in performance for insurers, MGAs, and insurance intermediaries. From greenfield embedded insurance ventures to multi-country core modernization programs, our SaaS solutions power top customers across life, health, and P&C; insurance.
About The Role As a Principal AI Full-Stack Engineer on the AI Platform team, you'll own the design, build, and operation of the agentic AI systems powering our core insurance products — architecting LLM inference chains, building production AI infrastructure, shipping full-stack features from model to UI, and setting technical direction for the team. Design and optimize LLM inference chains: prompt engineering, structured outputs, fine-tuning (LoRA/PEFT), evals, and observability.
Stand up production-grade AI infrastructure: vector databases, semantic retrieval, model gateways, inference acceleration,



and cost governance.
Own full-stack delivery — frontend (React/Next.js), backend (Python/TypeScript), cloud-native deployment (K8s/Serverless) — taking demos to policy volumes in the millions.
Proven track record shipping and operating production software at scale, ideally including an LLM/AI system taken from prototype to production.
Fluent in Python or TypeScript and a modern frontend framework, with genuine comfort spanning backend, frontend, infrastructure, data, and model code.
Hands-on LLM engineering depth: Solid AI infrastructure grounding — vector databases, embedding models, model deployment/serving, inference optimization, distributed systems — with the operational discipline for regulated environments.
External technical signals — open-source contributions, technical writing, conference talks.
Interest in multimodal AI, long-context engineering, applied AI safety/alignment, o

📌 Principal Fullstack Engineer (Madrid)
🏢 Peak3 (Formerly Za Tech)
📍 Madrid