Senior GenAI Security Engineer - Remote (2 days/wk)

Lenstra; Paris; Hybrid; EUR 129,000 - 148,000; Full time

Benefits offered by this job

2 days home office per week

Hybrid work model

Job summary

Lenstra is seeking an Application Security expert to lead AI and cloud security across client environments, shaping policies and security controls from design to production. You will drive threat modeling, design reviews, and secure deployment of identity and access controls for on‑prem and cloud systems.

The role requires deep AWS security expertise, hands-on experience with LLMs, and fluent French and English communication. A hybrid work setup with 2 days of home office per week is offered.

Qualifications

• 5+ years of hands-on AppSec on modern cloud architectures.
• Deep AWS cloud security expertise.
• Solid grasp of LLM architecture, embeddings, vector databases, RAG and inference.
• Hands-on experience securing MCP servers, skills and agentic coding tools (e.g. Claude Code).
• Experience on OWASP Top 10 for LLMs and for Agentic Applications.
• Experience on SAML, OAuth2, OpenID Connect.
• Docker, Kubernetes security and image vulnerability scanning.
• IaC and automation: Terraform, Ansible, CloudFormation.
• Linux and networking (TCP/IP, UDP, HTTP/S, SSH).
• Strong coding skills in Python.
• Fluent French and English.

Responsibilities

• Be the go-to expert on AI and cloud application security, setting policies and best practices company-wide.
• Build and run controls to secure AI and agentic systems: sandboxes, guardrails, compliance checks, vulnerability management.
• Lead design reviews, threat modeling and architecture assessments before risks reach production.
• Deploy identity, authentication and access control (RBAC/ABAC) with the Core & Architecture team, on-prem and in the cloud.
• Help dev teams fix cloud and IaC findings, plug security tooling into CI/CD with low noise and zero slowdown, and track security KPIs.

Skills

AppSec expertise

Cloud security

Python programming

Threat modeling

Communicating in French and English

Security policy & governance

Tools

Docker

Kubernetes (EKS/ECS)

Terraform

CloudFormation

Job description

Lenstra is seeking an Application Security expert to lead AI and cloud security across client environments, shaping policies and security controls from design to production. You will drive threat modeling, design reviews, and secure deployment of identity and access controls for on‑prem and cloud systems.

The role requires deep AWS security expertise, hands-on experience with LLMs, and fluent French and English communication. A hybrid work setup with 2 days of home office per week is offered.