Skip to content
← Back to job listings

Senior Full Stack Engineer (AI & Platform Innovation)

LegionellaDossier · Utrecht, Netherlands

External listingfull-timeabout 1 month ago

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

This is an external listing. JobSpring does not represent or verify the employer. Report this listing