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Senior Full Stack Engineer (AI & Platform Innovation)
LegionellaDossier · Utrecht, Netherlands
About The Role
Join our team as a Senior Full Stack Engineer, where you will play a crucial role in building AI-heavy product features and the technical foundation behind them. You will design and build full stack applications using Node.js and Next.js, develop AI-native product experiences, and implement and manage self-hosted LLM infrastructure. This is not just a role for integrating APIs or shipping CRUD features; we are looking for an engineer who thinks AI-first by default and is excited about building the infrastructure and product capabilities that will define the next generation of SaaS.
- Designing and building full stack applications using Node.js and Next.js, with a focus on AI-heavy product features.
- Implementing and managing self-hosted LLM infrastructure, experimenting with different open-source and commercial models.
- Working closely with product and engineering leadership on long-term platform strategy, and building AI orchestration layers and intelligent workflows.
- 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
- Experience working with LLMs, embeddings, RAG pipelines, or AI agents
- A full stack mindset and the ability to own features end-to-end
- The ability to move fast without creating chaos
- Understanding of GPU workloads, inference optimization, and AI infrastructure tradeoffs
- Curiosity and obsession with where software engineering is heading next
- Experience comparing model quality, latency, and operational cost
- Knowledge of self-hosted/open-source models such as Llama, Mistral, DeepSeek, Qwen, or similar
- A strong engineering mindset focused on scalability, maintainability, and performance
- We are looking for a senior engineer with strong product intuition and a deep curiosity for modern AI systems
- Experience with Next.js and modern frontend architecture
- You should have:
- Strong experience with Node.js and modern TypeScript ecosystems
- You are the kind of engineer who:
- You probably spend time reading about:
- Inference optimization
- AI developer tooling
- Thinks beyond tickets and sees platform opportunities
- AI infrastructure
- Have experience fine-tuning or evaluating models
- Likes solving hard technical problems
- Have experience with Kubernetes or cloud-native infrastructure
- Wants to help shape the direction of a rapidly scaling platform
- Questions old assumptions and outdated architectures
- Have built AI copilots, autonomous workflows, or internal AI tooling
- Open-source LLM ecosystems
- Experiments with new AI tooling before it becomes mainstream
- Understands the balance between innovation and pragmatism
- Agentic workflows
- Have opinions about when not to use AI
- Retrieval systems
- And you probably already have side projects involving AI
- Have worked with vector databases and retrieval systems
- Emerging platform architectures
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