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Senior Ai Backend Engineer

France; Poland, Lyon · Job Posted July 03, 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. ✨ In 2025, LumApps strengthened its leadership position by partnering with Beekeeper, a pioneer in frontline employee experience solutions. This strategic collaboration expands our reach and impact across all types of workers — from HQ to the frontline. Our mission: To make people feel that they belong and have a purpose. To create an environment where all employees are engaged and work together towards the same goal. Over 700 leading companies trust our solution to: 🎯 Improve the productivity of their teams with our AI-powered Collaborative Experience Platform integrated with both Google and Microsoft collaborative suites, 🎯 Transform employees into real ambassadors of their company, 🎯 Make employees more efficient and better connected to their peers and relevant information, regardless of their location, with the tools and information they need at their fingertips, 🎯 Help companies reduce turnover, accelerate employee onboarding, better collaborate and share knowledge, and even improve their customer experiences. With a team of over 600 Lumies spread across 11 offices (Lyon, Paris, Lille, Sophia Antipolis, London, Barcelona, Hamburg, Austin, Tokyo, Zurich, Krakow), we support large enterprises all around the world. Over the past year, we have been driving an ambitious phase in our journey under the impulse of our new shareholder Bridgepoint, aimed at propelling us to become the clear leader in our market and shine worldwide in our industry. We are looking for individuals who are excited to actively participate in this transformation. The AI Agents Platform Team is at the heart of LumApps' most ambitious product bets. We design, build, and evolve the backend systems that power AI-driven experiences across the platform — from conversational agents and agentic workflows to RAG pipelines, multi-agent orchestration, and real-time streaming infrastructure. Our backend scope includes: Agent Engine: the core orchestration layer powering multi-agent systems using Google ADK and AWS Strands, with LLM routing, tool execution, stateful session management, and real-time streaming via the AG-UI protocol and Server-Sent Events; RAG & Knowledge Retrieval: retrieval-augmented generation pipelines that connect agents to LumApps content, with source attribution, reranking, and sub-agent exploration; Agent Studio Backend: the data layer and API surface for creating, configuring, and governing AI agents at scale — tools, permissions, feature flags, YAML-driven agent definitions, and multi-tenant architecture; Observability: tracing and metrics via Langfuse and OpenTelemetry to monitor LLM calls, tool invocations, and agent behavior in production.

Job Responsibility

  • Independently scope and implement solutions for team projects
  • make well-reasoned design decisions
  • handle open-ended problems and ambiguity
  • ship frequently
  • estimate rigorously
  • communicate technical issues and decisions clearly to cross-functional audiences
  • write meaningful code reviews
  • proactively identify and resolve problems
  • design with security in mind
  • mentor junior engineers
  • lead and coach within team
  • elevate testing practices
  • help drive hiring by reviewing technical tests and conducting technical interviews

Requirements

  • 3-5 years of professional backend experience
  • solid Python skills
  • strong grasp of Clean Architecture and SOLID principles
  • experience or strong curiosity with agent orchestration frameworks like Google ADK or AWS Strands
  • experience or strong curiosity with RAG architectures
  • experience or strong curiosity with LLM providers such as Google Gemini running on Vertex AI and Mistral
  • understanding of Flask, SQLAlchemy, Alembic, Redis, PostgreSQL, Pub/Sub, GCS
  • knowledge of deploying to GCP and production monitoring via OpenTelemetry and Langfuse
  • write unit tests, component tests
  • communicate in English fluently
  • security-conscious engineer
  • collaborative teammate

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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