Description:

Zefir is Europe's fastest-growing Real Estate Marketplace, transforming how homes are bought and sold.
The company has achieved over €1 billion in Gross Merchandise Volume (GMV) and grown to a €15 million annual revenue run rate in just 20 months.
Zefir is backed by over €40 million from top-tier investors, including Sequoia Capital and Fintech Collective.
The Engineering Team is rapidly expanding from 9 to over 30 engineers, focusing on solving meaningful problems for customers.
Engineers at Zefir take full ownership of their work, ensuring impactful feature delivery.
Responsibilities include developing and deploying robust APIs using Node.js, Nest.js, and GraphQL, building frontend applications with React.js and Next.js, and collaborating with cross-functional teams.
Engineers will own the full lifecycle of features, write clean and maintainable code, implement end-to-end tests, and contribute to strategic decisions regarding web applications and infrastructure.
The role involves leveraging LLM-based libraries and implementing AI-driven functionalities.

Requirements:

Proven expertise in backend API development using Node.js, Nest.js, and GraphQL is required.
Strong experience in building responsive, user-friendly interfaces with React.js and Next.js is necessary.
An entrepreneurial mindset with the ability to turn ambitious ideas into practical solutions is essential.
Excellent problem-solving skills and the ability to recommend effective technological solutions quickly are required.
Candidates must be highly collaborative, open-minded, and comfortable working with diverse teams.
An ambitious, performance-oriented attitude is expected, along with fluency in English for effective communication.
Experience with LLM-based libraries, AI frameworks (e.g., Langchain), and vector databases (e.g., Pinecone) is required, including knowledge of Retrieval-Augmented Generation (RAG) and related workflows.

A competitive salary is offered, with a salary calculator available for simulations.
BSPCE (Stock Options) are available for all employees, with monthly vesting after the first year over a four-year period.
Full healthcare coverage is provided for team members, their partners, and children through Alan.
The office is located in Sentier, Paris (2nd arrondissement), with flexible remote work options.
A Swile meal card is provided, offering €11 per worked day.
A Swile mobility card is available, providing €42/month to support sustainable transportation options.
Monthly team events, including Mixers and quarterly All Hands meetings, are organized to celebrate company wins and foster connections.