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LumApps Logo LumApps · IT - Software Development

Senior Fullstack Engineer - AI

France, Lyon · Job Posted June 15, 2026
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Job Description

LumApps is now more than just an Employee Experience Platform — it is an AI-powered Employee Hub that supports companies in their digital transformation of communication, collaboration, and engagement with their customers, partners, and above all their employees. Our platform is a proven leader in this dynamic market with a truly unique vision and product. It has been deployed by Fortune 500 clients around the world and is delivering meaningful business benefits. LumApps is identified as a leader in Gartner's Magic Quadrant for Intranet Packaged Solutions as well as in Intranets Forrester Wave, and regularly selected for the French Tech Next40/120 program.

Job Responsibility

  • Define and own the technical vision for the AI Agents tribe across the stack
  • Drive major architectural decisions — from agent communication protocols (MCP, A2A, AG-UI) and streaming patterns to data modeling, service boundaries, and state management — while tracking implications on adjacent systems and teams
  • Independently scope and implement complex end-to-end solutions, from API and data layer through to the user-facing experience
  • Identify and proactively tackle technical debt
  • Plan and execute projects that span multiple teams within the tribe
  • Partner with product and engineering leadership to translate roadmap goals into concrete technical strategies, providing reliable project estimates and owning delivery accountability
  • Define canonical patterns and lead-by-example on testing, performance, observability, and security
  • Conduct rigorous code reviews and challenge both specifications and implementations when needed
  • Mentor Software Engineers, providing actionable feedback on strategy, impact, execution, and technical depth
  • Share knowledge through engineering articles, internal presentations

Requirements

  • 6+ years of professional software engineering experience, with deep expertise in Python for backend services and solid command of TypeScript and React (v17+) on the frontend
  • Strong opinions on API design, service boundaries, component design, performance optimization, and maintainability at scale in a large monorepo
  • Comfortable building production microservices following Clean Architecture / SOLID principles — designing clear domain layers, working with relational databases (PostgreSQL, SQLAlchemy), event-driven patterns (Pub/Sub), and REST/OpenAPI contracts
  • Shipped and operated services in the cloud (GCP and/or Azure)
  • Hands-on experience or strong curiosity with agent interoperability protocols like the Model Context Protocol (MCP) and Agent-to-Agent (A2A), agent-to-UI streaming via the AG-UI protocol (SSE, WebSockets), and integrating with LLM providers such as Google Gemini and Mistral running on Vertex AI, using agentic frameworks like Google ADK or Strands Agents
  • Can design systems end-to-end
  • Thinks about functional correctness, technical scalability, and security implications simultaneously
  • Has contributed to or led significant architectural decisions in a production codebase
  • Proficient with backend unit/component/integration testing (pytest and equivalents) as well as frontend tooling (Jest, React Testing Library, Storybook, Playwright)
  • Speaks English fluently
  • Able to give direct, constructive feedback, share knowledge proactively, and care about building a team culture grounded in psychological safety and technical excellence
  • Designs with authentication, authorization, and tenant isolation in mind
  • Builds services to be observable and resilient from the start

What we offer

  • Hybrid work model – 2 days at the office, 3 days remote
  • RTT days – ~10 extra days off per year
  • Meal vouchers (SWILE) + free snacks & coffee
  • Yoga classes in Paris office
  • Supportive parental leave and family moments
  • Health insurance (ALAN) – 60% covered + full life & disability cover
  • Afterworks, team celebrations & seasonal parties
  • Equipment of your choice
  • French & English lessons, professional development & access to Leeto CSE
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