As a Software Engineer at Zefir, your primary responsibilities will include developing and deploying high-performance APIs using technologies like Node.js, Nest.js, and GraphQL. You'll also be building intuitive frontend applications with React.js and Next.js to ensure great user experiences. Additionally, you will collaborate with cross-functional teams to prioritize feature development, own the full lifecycle of projects from ideation to performance monitoring, and contribute to strategic decisions regarding our applications.

To be considered for the Software Engineer position at Zefir, you should have proven expertise in backend API development, specifically using Node.js, Nest.js, and GraphQL. A strong background in frontend technologies such as React.js and Next.js is also essential. Along with technical skills, Zefir looks for an entrepreneurial mindset, excellent problem-solving abilities, and the capacity to work collaboratively with diverse teams. Fluency in English is important for effective communication throughout the organization.

At Zefir, you will work with a range of modern technologies, including Node.js, TypeScript, Nest.js, GraphQL for backend development, and React.js, Next.js for frontend applications. Additionally, experience with AI frameworks and LLM-based libraries, such as Langchain and Pinecone, will be advantageous as you will implement key AI-driven functionalities within our applications.

The culture at Zefir is dynamic, collaborative, and innovation-driven. As a Software Engineer, you'll be part of a team that encourages open communication, embraces diverse perspectives, and prioritizes team success over individual achievements. Monthly team mixers and quarterly All Hands meetings ensure that everyone's contributions are celebrated, fostering a sense of belonging and community within the company.

Zefir offers a competitive salary along with various benefits, including BSPCE (stock options), full healthcare coverage with Alan for you and your family, meal and mobility cards to support daily expenses, and an office located in the Sentier area of Paris with flexible remote work options. We also hold regular team events to unite the team and encourage social connections.

In your answer, focus on specific projects where you utilized Node.js and GraphQL. Discuss how you approached API design, your methods for optimization, and any challenges you faced. Highlight your problem-solving skills and your ability to integrate new features based on user feedback.

When answering this question, emphasize your coding practices such as writing clean, modular code, conducting thorough testing, and implementing end-to-end tests. Discuss your methods for documentation and how you collaborate with others to share best practices to ensure maintainability and scalability.

Utilize the STAR method (Situation, Task, Action, Result) to describe the problem and your approach. Be specific about the technologies you used, your thought process in tackling the issue, and the outcome. This demonstrates analytical skills and resilience in the face of challenges.

Explain your approach to understanding user needs and metrics that inform product decisions. Detail how you communicate with Product Managers to align on priorities, balancing user experience with technical feasibility, and how you adapt when priorities change.

Discuss specific applications you've built using React.js, focusing on state management, component design, and user interface considerations. Highlight frameworks, tools, or libraries you used (e.g., Redux, React Router) and any performance optimization techniques you implemented.

Share the resources you use, such as blogs, online courses, or networking events. Mention any projects you’ve worked on involving new technologies, showcasing your continuous learning and adaptability in an ever-evolving field.

Discuss your approach to conflict resolution, emphasizing patience and open communication. Describe instances where you successfully navigated disagreements through compromise or collaboration, illustrating your ability to prioritize team success.

Highlight specific examples where you identified, evaluated, and introduced a new technology to your team or projects. Discuss the impact it had on the project’s success, such as performance improvements or expedited developments.

Detail the tools or frameworks you’ve used for end-to-end testing and how you plan tests to cover user scenarios. Discuss the importance of testing in ensuring a smooth user experience and your experience in implementing these strategies.

Discuss your learning strategy when approaching new technologies, which may include reading documentation, experimenting through coding challenges, or collaborating with peers. Highlight an example where this strategy led to successful implementation.