Hybrid Senior FullStack Developer

at CryptoNext Security

• Job title: Senior FullStack Developer
• Job type: Full Time
• Experience level: Senior
• Salary: Not specified
• Degree requirement: Postgraduate Degree
• Tech skills: Docker, JavaScript, Kafka, Kubernetes, Node.js, React, TypeScript
• Location requirements: Hybrid, Paris, France

About the role

• Full Stack Developer at CryptoNext building observability tools for cryptographic operations. Collaborating across the stack with engineering teams to enhance product architecture and functionality.

Responsibilities

• As a Full Stack Developer, you will contribute to the development of DISCOVERY, our next-generation observability and orchestration platform.
• Work across the entire stack — backend services, data flows, and frontend interfaces — collaborating closely with product, backend, and infrastructure teams.
• Design, develop, and maintain full-stack features for the DISCOVERY platform.
• Build modern, responsive React front-ends integrated with Node.js and Kafka backends.
• Participate in architectural decisions and propose technical improvements aligned with long-term product vision.
• Design and implement REST and event-driven APIs.
• Ensure performance, scalability, and resilience across distributed components.
• Collaborate with backend engineers on domain modeling, API contracts, and data flows.
• Implement advanced data visualization and monitoring features using the ELK stack.
• Integrate backend logs, metrics, and analytics into frontend dashboards.
• Participate in code reviews and uphold high engineering standards.
• Contribute to technical documentation and promote software craftsmanship.
• Apply KISS, DRY, SOLID, and pragmatic engineering principles.
• Contribute to deployment workflows, CI/CD pipelines, and automation initiatives.
• Work with Docker/Kubernetes-based environments to ensure smooth delivery.

Requirements

• 10+ years of experience in software development, ideally in a software editor or deeptech environment.
• Master’s degree from a French engineering school or European equivalent.
• Strong hands-on expertise in:
• Node.js
• React
• TypeScript
• Strong understanding of Docker, Kubernetes, and containerized deployments.
• Experience with message-driven architectures (Kafka or equivalent).
• Solid understanding of the ELK stack and its application in observability/analytics contexts.
• Comfortable with CI/CD, Git workflows, automated testing, and modern DevOps practices.
• Deep grasp of software design principles and maintainability.
• Fluent in English.

Benefits

• Join a fast-growing deeptech company at the cutting edge of quantum-safe cybersecurity.
• Work on challenging engineering problems using modern technologies.
• Build next-generation observability tools for cryptographic operations.
• Flexible remote policy + office in central Paris.
• Competitive compensation aligned with your seniority and expertise.
• Direct impact on the future of secure communications.