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Zefir Tech Stack

AI agent automating home sales transactions across Europe

Real Estate Paris, Île-de-France 51–200 employees Founded 2021 Privately Held

Zefir runs an AI transaction layer for residential real estate in France, with an agent orchestrating the full buy-sell journey across brokers, portals, buyers, and documents. The tech stack—Node.js, Next.js, React, Pinecone, Langchain, and RAG—reflects an AI-first architecture built on vector search and retrieval-augmented generation. Current hiring is sales-heavy (4 of 7 open roles), paired with active work on lead qualification and CRM optimization, indicating a phase of distribution build-out after the product core.

Tech Stack 19 technologies

Core StackCustomer.io Twilio HubSpot BigQuery Node.js Nest.js GraphQL TypeScript React Next.js Pinecone Langchain RAG Instagram TikTok Google WhatsApp Excel Google Sheets

What Zefir Is Building

Challenges

  • Reducing transaction time
  • High-volume lead management
  • Optimizing inbound sales
  • Eliminating sales process inefficiencies
  • Integrating ai into sales
  • Scaling crm across business units
  • Optimizing crm contribution to growth
  • Data reliability
  • Cash flow forecasting
  • Improving conversion rates

Active Projects

  • Sales acquisition strategy implementation
  • Ai-driven lead qualification
  • Complex campaigns set-up
  • Experiment framework for crm optimization
  • Financial dashboards
  • Rolling forecasts
  • Data flow optimization
  • Api development with node.js, nest.js, graphql
  • Frontend development with react.js, next.js
  • Ai-driven functionalities with pinecone, langchain, rag

Hiring Activity

Steady7 roles · 3 in 30d

Department

Sales
4
Engineering
1
Finance
1
Marketing
1

Seniority

Mid
3
Intern
1
Junior
1
Manager
1
Senior
1
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About Zefir

Zefir builds an AI transaction layer that automates home sales workflows for European real estate markets, starting in France. The platform deploys an AI agent to manage the entire purchase-and-sale cycle, coordinating local brokers, property portals, buyers, and document workflows. The company was founded in 2021 and operates from Paris with 51–200 employees. Work spans API development (Node.js, Nest.js, GraphQL), frontend engineering (React, Next.js), AI-driven features (Pinecone, Langchain, RAG), financial dashboards, and sales operations including lead qualification and CRM scaling.

HeadquartersParis, Île-de-France
Company Size51–200 employees
Founded2021
Hiring MarketsFrance

Frequently Asked Questions

What is Zefir's tech stack?

Zefir uses Node.js, Nest.js, GraphQL, React, and Next.js for backend and frontend. For AI, Pinecone, Langchain, and RAG power retrieval-augmented generation features. Operational tools include BigQuery, HubSpot, Twilio, Customer.io, and WhatsApp.

What is Zefir working on?

Zefir is focused on AI-driven lead qualification, sales acquisition strategy, CRM optimization experiments, API development, frontend work, and financial dashboards and forecasting to improve conversion rates and reduce transaction time.

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