Hybrid Senior Data Engineer – Platform

at CryptoNext Security

• Job title: Senior Data Engineer – Platform
• Job type: Full Time
• Experience level: Senior
• Salary: Not specified
• Degree requirement: Postgraduate Degree
• Tech skills: AWS, Cyber Security, ElasticSearch, ETL, Google Cloud Platform, Grafana, Kafka, Postgres, Prometheus
• Location requirements: Hybrid, Paris, France

About the role

• Senior Data & Platform Engineer leading the design and operations of data systems for post-quantum cryptography. Working on COMPASS, the observability platform for innovative cybersecurity solutions.

Responsibilities

• As Senior Data & Platform Engineer, you will lead the design, setup, and operation of the entire data backbone powering **COMPASS**.
• Define and maintain the **end-to-end data model** for COMPASS (entities, relationships, vocabulary, lifecycle).
• Translate product requirements into **robust database schemas**, indexing strategies, and normalization/denormalization choices.
• Ensure **semantic consistency** and data governance rules across all services.
• Design, validate, and maintain ingestion pipelines using **Kafka**, ensuring data correctness and consistency.
• Define the **canonical formats** exchanged across Kafka (ingestion), PostgreSQL (storage), and Elasticsearch (search).
• Validate and standardize data structures produced by probes, sensors, and backend services.
• Work closely with backend teams to design **API-level data contracts** aligned with the data model.
• Optimize queries, indexes, and persistence strategies for real-time workloads and analytics.
• Contribute to platform-wide observability by defining **structured logs**, metadata standards, and ingestion patterns.
• Promote best practices for **data quality**, versioning, retention, and schema evolution.

Requirements

• **15+ years** of experience in software or data engineering in a distributed or complex environment.
• Master’s degree from a French engineering school or European equivalent.
• Deep expertise in:
• **Data modeling** & relational schema design
• **PostgreSQL** administration & performance optimization
• **Kafka** (setup, topics/partitions, consumer groups, schema registry, monitoring)
• **Elasticsearch / ELK stack**
• Strong hands-on experience with:
• Stream processing architectures
• ETL/ELT workflows
• Data lifecycle management
• Proven ability to design data flows with **clean, contract-based schemas**.
• Strong commitment to code quality, documentation, and operational reliability.
• Fluency in English.
• **Bonus**
• Experience with ClickHouse, Grafana, or Prometheus.
• Understanding of secure data handling and cryptographic components.
• Familiarity with AWS/GCP or hybrid on-prem architectures.
• Background in cybersecurity, observability, or high-throughput systems.
• Experience with large-scale data retention strategies and analytics workloads.

Benefits

• Join a **deeptech company** at the forefront of post-quantum cybersecurity.
• Build the **core data infrastructure** of a cutting-edge observability platform.
• Collaborate with world-class cryptographers and software engineers.
• Flexible hybrid/remote policy and office in central Paris.
• Competitive compensation aligned with seniority and expertise.
• Direct impact on a product used by major financial and defense clients.
• A chance to shape the **future of quantum-safe data engineering**.