Founding Fullstack Engineer @Rose

# Founding Fullstack Engineer @Rose* Paris* Full-Time**Our approach**: Unlike traditional chatbots (~5% engagement), achieves **20%+ engagement** through an integrated assistant experience, not an intrusive popup.## Job Description### Rose in a nutshell**The problem**: 85% of B2B website visitors leave without interaction. Meanwhile, they use ChatGPT and Perplexity to compare solutions before even contacting you.**Our mission**: Transform B2B websites into intelligent conversational assistants that engage 100% of traffic, capture quality zero-party data, and increase demo conversions.**Our approach**: Unlike traditional chatbots (~5% engagement), achieves **20%+ engagement** through an integrated assistant experience, not an intrusive popup.**Our clients**: Pennylane, Mayday, AB Tasty are already using Rose in production.You'll join Rose as the **first Founding Engineer** to build the platform alongside, , CTO/Cofounder.You'll work on cutting-edge technical challenges in an environment where every line of code has a direct impact on the product and users.### Your missions**Architecture & Development*** 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.**AI & Performance*** 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.**Integrations & Product*** Build bidirectional integrations with CRMs (Salesforce, HubSpot)* Orchestrate calendar systems (Calendly, Chili Piper) and analytics (Posthog)* Participate in product decisions and user exchanges.### Tech Stack* **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.### Tech Philosophy* 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.## Preferred Experience* **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### Mindset* **Builder first**: you prefer building and iterating rather than debating for hours* **Product-minded*** **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)### Nice to have* **Builder first**: you prefer building and iterating rather than debating for hours* **Product-minded*** **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)### What we offer* **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* Contract Type: **Full-Time*** Location: **Paris*** **Occasional remote authorized**
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