Software Engineer

The role

The Software Engineer will develop and deploy APIs and frontend applications. They will own the full lifecycle of features from ideation to performance monitoring using Node.js, React.js, and AI-driven functionalities.

What you will do

• Develop and deploy robust, high-performance APIs using Node.js (TypeScript), Nest.js, and GraphQL.
• Build intuitive frontend applications with React.js and Next.js.
• Collaborate with Product Managers and cross-functional teams to prioritize features.
• Own the full lifecycle of features from ideation and design through implementation, deployment, and performance monitoring.
• Write clean, maintainable, thoroughly-tested code.
• Implement comprehensive end-to-end (E2E) tests.
• Contribute to strategic decisions about web applications and infrastructure.
• Leverage LLM-based libraries and implement AI-driven functionalities using Pinecone and Langchain.

Required qualifications

• Entrepreneurial mindset with ability to turn ambitious ideas into practical solutions.
• Excellent problem-solving skills.
• Highly collaborative and open-minded.
• Ambitious and performance-oriented.
• Fluent in both English and French, written and spoken.

Benefits

• Competitive salary
• BSPCE (Stock Options) with monthly vesting after year one over a 4-year period
• Full healthcare coverage with Alan for team members, partners, and children
• Office in Le Peletier, Paris (9th arrondissement)
• Flexible remote work options
• Swile meal card: €11 per worked day
• Swile mobility card: €45/month
• Monthly Mixers
• Quarterly All Hands

Before you apply

• Hiring for this role starts again from mid-November 2026.
• If you apply now, your profile joins a talent pool for up to 2 years.
• Interview process emphasizes hands-on exercises, case studies, or discussions about previous work.

About the company

Zefir is building an AI autopilot for home sales in Europe. The company is backed by €60 million from Sequoia Capital and Kima Ventures.