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.
Candidates should possess an entrepreneurial mindset with the ability to turn ambitious ideas into practical solutions.
Excellent problem-solving skills are essential, with the ability to evaluate and recommend effective technological solutions quickly.
The ideal candidate should be highly collaborative, open-minded, and comfortable working with diverse teams.
An ambitious and 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 through Alan for team members, their partners, and children.
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 per 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.