LegionellaDossier is hiring a Senior Full Stack Engineer (AI & Platform Innovation)

Node.js / Next.js / Self-Hosted LLMs / AI Systems BriqSafe (currently operating as LegionellaDossier) is the Netherlands' leading SaaS platform for water safety compliance. Since our founding in 2015, we've grown to a team of 30+ professionals in Utrecht, helping organizations across the Netherlands and the UK manage, automate, and prove compliance around water safety. We're now expanding into Spain and beyond, with a clear ambition: become the global market leader within the next five years. Our platform is undergoing a complete transformation, replacing our legacy system with a modern, scalable architecture built on microservices, event-driven communication, and a far more intelligent feature set. We are not looking for someone who simply integrates APIs or ships CRUD features. We are looking for an engineer who thinks AI-first by default. Someone who understands that modern software development is shifting from traditional applications toward intelligent systems, autonomous workflows, AI-assisted operations, and model-driven product experiences. Someone who gets excited about building the infrastructure and product capabilities that will define the next generation of SaaS. The Role You will play a key role in building AI-heavy product features and the technical foundation behind them. This includes: - Designing and building full stack applications using Node.js and Next.js - Developing AI-native product experiences - Implementing and managing self-hosted LLM infrastructure - Experimenting with different open-source and commercial models - Optimizing inference performance, scalability, and operational costs - Evaluating which models perform best for specific use cases - Building AI orchestration layers and intelligent workflows - Creating systems that combine automation, context-awareness, and real-world operational data - Working closely with product and engineering leadership on long-term platform strategy This is not a “bolt AI onto an existing app” role. AI will become part of the core platform architecture. What you’ll do We are looking for a senior engineer with strong product intuition and a deep curiosity for modern AI systems. You should have: - Strong experience with Node.js and modern TypeScript ecosystems - Experience with Next.js and modern frontend architecture - A full stack mindset and the ability to own features end-to-end - Experience working with LLMs, embeddings, RAG pipelines, or AI agents - Knowledge of self-hosted/open-source models such as Llama, Mistral, DeepSeek, Qwen, or similar - Understanding of GPU workloads, inference optimization, and AI infrastructure tradeoffs - Experience comparing model quality, latency, and operational cost - A strong engineering mindset focused on scalability, maintainability, and performance - The ability to move fast without creating chaos - Curiosity and obsession with where software engineering is heading next Bonus points if you: - Have experience with Kubernetes or cloud-native infrastructure - Have worked with vector databases and retrieval systems - Have built AI copilots, autonomous workflows, or internal AI tooling - Have experience fine-tuning or evaluating models - Have opinions about when not to use AI What you bring You are the kind of engineer who: - Experiments with new AI tooling before it becomes mainstream - Thinks beyond tickets and sees platform opportunities - Questions old assumptions and outdated architectures - Likes solving hard technical problems - Understands the balance between innovation and pragmatism - Wants to help shape the direction of a rapidly scaling platform You probably spend time reading about: - Open-source LLM ecosystems - AI infrastructure - Agentic workflows - Retrieval systems - Inference optimization - AI developer tooling - Emerging platform architectures And you probably already have side projects involving AI. What we offer: - The opportunity to build AI-first systems from the ground up - Real ownership and influence on technical direction - A rapidly growing international SaaS platform - Complex technical challenges with real-world impact - Freedom to experiment and innovate - A strong engineering culture focused on building scalable systems - The chance to help define the next evolution of BriqSafe We are moving fast. The platform is expanding internationally, new verticals are being launched, and AI is becoming a foundational part of how we build products and operate internally. If that excites you, we should talk.