FullStack Developper

Cryptonext Security

Paris, Île-de-France, France Hybrid permanent

Posted: March 4, 2025

Required Skills

Job Description

Who we are

CryptoNext Security is a deeptech startup specializing in post-quantum cryptography. Our solutions help businesses and institutions prepare for a future where quantum computers will challenge traditional data security. We work with leading clients in finance, defense, and telecommunications.

On a daily basis, you will

• Design and develop React-based user interfaces for our post quantum cryptography products.
• Collaborate with Product and Backend teams to ensure a smooth and intuitive user experience.
• Optimize performance and ensure cross-browser and cross-device compatibility.
• Integrate REST APIs to interact with our backend services.
• Participate in code reviews and apply best practices (unit testing, continuous integration, documentation).
• Contribute to frontend architecture improvements by suggesting technological upgrades and refactorings.
• Enable improvement of our products even if outside of your common scope
• Embrace our frontend team work principles: “Done over perfect” / we ship/deliver fast: KISS, DRY (don’t repeat yourself), SOLID

Requirements:
The skills you'll need

• Strong expertise in React / Next.js and its ecosystem (React Hooks, Context API).
• Excellent knowledge of TypeScript and robust programming principles.
• Experience with modern UI libraries (Tailwind, or chadcn/ui).
• Experience integrating REST APIs
• Good grasp of frontend performance optimization and related tools (Webpack, Vite, CoreWebVitals).
• Experience with frontend testing frameworks (Jest, React Testing Library, Cypress).
• Familiarity with Git, CI/CD pipelines, and DevOps for automated integration and deployment.

Bonus skills

• gRPC.
• Knowledge of secure coding practices and application security.
• Basic understanding of cryptography and cybersecurity.
• Experience in a startup or deeptech environment.

Benefits:
The team you'll be joining

You will be part of our R&D team, working closely with backend developers, the product team, and UX/UI designers. You will report to the and collaborate with other departments to build high-performance, user-friendly interfaces tailored to our clients’ needs.

Our recruitment process

• Initial discussion with our HR team to explore your background and motivations.
• Technical interview with a developer, including a coding test.
• Meeting with a manager to ensure alignment with our company culture.
• If successful, you’ll receive a final offer! 🚀

What’s in it for you at CryptoNext

• A stimulating work environment with cutting-edge technological challenges.
• A fast-growing startup with a team of passionate professionals.
• Flexible remote work options and an office in Paris.
• A competitive salary, aligned with our compensation philosophy.
• A deep dive into the exciting world of post-quantum cryptography and cybersecurity.

Ready to join the adventure? 🚀 Apply now!

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