Senior Security Operations Engineer

Academic Key; Paris; Hybrid; EUR 110,000 - 140,000; Full time

Job summary

DiliTrust in Paris – La Défense is seeking a Senior Security Operations Engineer to protect its SaaS platform, cloud infrastructure, networks and production environments. You will join the Infrastructure & Security team, a 12-person group across Europe and North America, embedding security into architecture, operations and delivery.

You will monitor threats, respond to incidents, manage vulnerabilities, implement hardening, and automate with IaC, Terraform and Ansible.

Qualifications

• Minimum 5 years in Security Operations or related field.
• Experience with security monitoring, incident response, vulnerability management, hardening and operational security.
• Strong automation and DevOps mindset; prefer automating processes over manual work.
• Excellent communication, autonomous, analytical with a service-oriented mindset.
• Fluent English; able to collaborate in an international team.

Responsibilities

• Monitor the security of networks, cloud infrastructure, systems, applications and endpoints.
• Administer, configure and improve security tools (CNAPP, SIEM, EDR, bastion, ZTNA, PKI, WAF).
• Continuously evolve detection mechanisms and threat-detection scenarios.
• Investigate security alerts and incidents, support root-cause analysis, remediation and post-incident reviews.
• Automate deployments with Infrastructure as Code and scripting.
• Define and deliver the team's security roadmap with Hiring Manager and peers.

Skills

Linux

Docker

Kubernetes

Networking

IaC

PKI

CNAPP

SIEM

EDR

WAF

Tools

Terraform

Ansible

AWX

Job description

Senior Security Operations Engineer

DiliTrust · Paris - La Défense

Permanent

As a Security Operations Engineer, you will help protect DiliTrust's SaaS platform, cloud infrastructure, networks and production environments. You will join the Infrastructure & Security team, a 12-person team spread across France, Canada and Spain, and work in an international context (Europe, North America and EMA). The infrastructure you will secure is managed in an automated way and counts more than 350 assets hosted across our cloud providers. You will contribute to the continuous improvement of our security posture through monitoring, incident response, vulnerability management, hardening and automation, and you will work closely with infrastructure, DevOps, development and product teams so that security is embedded into our architectures, operations and delivery processes.

Missions

• Security monitoring & incident response
  • Monitor the security of networks, cloud infrastructure, systems, applications and endpoints.
  • Administer, configure and continuously improve our security tools, including CNAPP, SIEM, EDR, bastion, ZTNA, PKI, antivirus and WAF solutions.
  • Continuously evolve our detection mechanisms and threat-detection scenarios.
  • Investigate security alerts and incidents, support incident handling, and contribute to root-cause analysis, remediation and post-incident reviews.
• Hardening, vulnerabilities & secure architecture
  • Implement hardening measures and support vulnerability identification, prioritization, remediation and follow-up through action plans.
  • Validate the security aspects of IT architectures and application projects.
  • Actively participate in security audits and penetration tests: scoping, support during the exercise, remediation of findings and follow-up.
  • Test products and run technical validations on prototype environments before they reach production.
• Automation & Infrastructure as Code
  • Automate deployments and security / infrastructure operations using Infrastructure as Code, configuration management and scripting.
  • Create and maintain security procedures, incident-response playbooks, operational documentation and technical standards.
• Roadmap, watch & knowledge sharing
  • Define and deliver the team's security roadmap together with the Hiring Manager and your peers.
  • Keep an active watch on threats and security news, and share what you learn with the team.

Candidate Profile

• Experience & seniority
  • You have at least 5 years of professional experience in Security Operations, Cybersecurity, Infrastructure Security, Cloud Security or a related field (network, systems or cloud engineering with a strong security component).
  • You have practical experience with security monitoring, incident response, vulnerability management, system hardening and operational security.
• Mindset & collaboration
  • You are passionate about cybersecurity and interested in automation and the DevOps culture; you would rather automate a process than repeat it.
  • You are analytical, autonomous, versatile and rigorous, with a strong sense of service and good synthesis skills.
  • Communicate clearly with both technical and non-technical stakeholders, and you are confident in your expertise without losing the team spirit.
  • You enjoy working collaboratively in an international, distributed team and have a good command of English.
• Technical Skills : Required
  • Good knowledge of Linux (Debian-based environments in particular), Docker and Kubernetes.
  • Good knowledge of networking, enough to design, routing and firewall rules: TCP/IP, DNS and TLS; static routing, VLANs, segmentation and NAT; stateful and application-level firewall rule design; reverse proxies and load balancers; VPN and overlay technologies (WireGuard, IPsec); ZTNA principles (identity-aware access, device posture, micro-segmentation); cloud networking (VPC, peering, private endpoints).
  • Ability to manage network and security configurations as code, using Infrastructure as Code and automation tools such as Terraform, Ansible and AWX.
  • Good knowledge of PKI and certificate management: CA hierarchies, certificate lifecycle (issuance, renewal, revocation, automation), TLS / mTLS, key and secret management.
  • Administration of security tools: CNAPP, SIEM, EDR, bastion, ZTNA and PKI, including interpreting security events and alerts.
  • Hands-on experience with WAF (policy and rule tuning).
  • Familiarity with monitoring tools such as Prometheus, Grafana and Datadog.
  • Ability to script and automate repetitive operational or security tasks.
• Nice to have
  • Knowledge of Google Cloud Platform or an equivalent cloud environment.
  • An active interest in security news, emerging threats, conferences and meetups.
• Our Security & Infrastructure Environment :
  • Cloud: Google Cloud Platform and other cloud providers, with automated infrastructure management (700+ assets)
  • Systems & containers: Linux (Debian), Docker, Kubernetes
  • Automation: Ansible, AWX, Terraform
  • Network & access: ZTNA, bas