Founding Fullstack Engineer @Rose
- Architecture & Development
- AI & Performance
- Integrations & Product
Co-build the technical architecture with the CTO (backend, frontend, infrastructure) Develop core features: conversational AI engine, interactive experiences, third-party integrations, back-office Make technical choices that structure the platform for the next 5 years
Participate to the implementation of RAG (Retrieval-Augmented Generation) systems in production with Vector database and knowledge graph Optimize real-time performance Develop guardrails and testing mechanisms to ensure AI response quality
Build bidirectional integrations with CRMs (Salesforce, HubSpot) Orchestrate calendar systems (Calendly, Chili Piper) and analytics (Posthog) Participate in product decisions and user exchanges
- Backend : Python, Fast API, PostgreSQL, MongoDB Vector Database, Neo4j
- Frontend : React, TypeScript AI/ML : LLMs, Vector embeddings, prompt engineering, Langgraph
- Infrastructure : GCP, GitHub Actions, monitoring and observability
- We favor pragmatism over theoretical perfection, iteration velocity over over-engineered architectures, and user impact over technical elegance. You'll work in an environment where we ship quickly, test with real users every week, and learn constantly.
- 4+ years of experience in fullstack development on B2B SaaS products
- Mastery of React/TypeScript on the frontend and a modern backend framework
- Experience with Python
- Experience with SQL and NoSQL databases , REST or GraphQL API design
- Ability to define technical architectures and challenge design decisions
- Experience deploying and monitoring applications in production
- Builder first : you prefer building and iterating rather than debating for hours
- Product-minded : you think about user impact before technical elegance
- Ownership : you make decisions, own the results, and adjust
- Adaptability : you're comfortable with ambiguity and pivots of an early-stage startup
- Technical curiosity : you love learning (generative AI, for example, even if you're a beginner)
- UX and design sensibility
- Experience with complex third-party integrations (CRM, analytics, calendars)
- Experience with generative AI or LLMs
- International or multilingual context
- Competitive salary aligned with the senior engineer market in Paris
- Lastest Macbook Pro
- Premium health insurance (Alan or equivalent)
- Joining a renowned startup studio: you'll be in a dynamic environment, surrounded by smart and ambitious people in a fun atmosphere
- Lovely offices at Hexa, in Paris (75010)
- Hybrid remote: 2 days a week in the office, the rest is up to you
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