Top Cybersecurity Jobs in France

Design, implement, and maintain Firefox security architecture and cryptography stack (WebPKI, cryptographic protocols). Build web platform security features, debug multi-threaded cross-platform native code, improve performance and memory usage, collaborate across teams, and contribute to technical design and standards-based implementations.

Lead and operate global network security: design and implement security for LAN/WAN/Wi‑Fi, firewalls, proxies and VPNs; manage incidents, third‑level troubleshooting, vendor relationships, change control, continuity and network security roadmap; collaborate with regional network, security and service teams.

Design and recommend Microsoft-centric security architectures, perform scoping and studies, deploy and implement Defender, Azure, O365 and identity security solutions, and support investigations and client advisory across major-account projects.

Maintain and mature Mozilla's ISMS and support ISO 27001 and SOC 2 Type 2 audits. Manage SoA, risk treatment plans, policy program, gap tracking and remediation, internal audit support, and cross-functional evidence collection. Advise leadership on audit risk and certification readiness.

Provide Microsoft-ecosystem security consulting for major accounts: assess and scope projects, recommend architectures, deploy security solutions across endpoints, identity, Office 365, and Azure, and support investigations and client advisory work.

Deliver and assess cyber security controls across the NIST framework for LCH SA, manage vulnerability and incident processes, oversee outsourced security services, produce SLA/KPI reporting, automate control checks via scripting, and support IT security colleagues to ensure a resilient, compliant information system for a regulated financial clearing house.

Design, implement, and maintain cybersecurity solutions for government and critical infrastructure. Integrate security controls, monitor SIEM events, remediate vulnerabilities, secure on-prem/cloud/hybrid environments, automate detection/response, produce risk and audit documentation, and advise stakeholders.

Lead strategy and roadmap for Operations Security product family, covering IAM, network and cloud security. Manage demand and backlog, own EPICs, oversee ITFM and product lifecycle, coordinate squads and resources, engage stakeholders (CISO, global teams), and ensure delivery of security operations excellence and value realization.

Advise and design Microsoft security architectures (EMS, Defender, Azure Sentinel, identity/PAM/PIM), analyze and validate technical solutions, oversee implementations, provide presales input, perform technology watch, and support delivery teams.

Lead Microsoft security pre-sales: design and present Microsoft security architectures (on‑prem, cloud, hybrid), support sales with proposals and costing, deliver POCs, maintain partner relations, develop offerings, and monitor sensitive projects using Microsoft security stack (Defender, Sentinel, Entra ID, Purview, Azure Security).

Owner of offensive security testing and continuous perimeter monitoring across external domains, IPs, DNS, VPS, and office infrastructure. Conduct adversary emulation against endpoints/EDR/XDR, scoped web/API tests, and document exploitation chains. Translate findings into defensive controls, support Purple Teaming, and improve asset tracking and remediation metrics.

Lead full‑stack development and platform reliability for the Firefox Add‑ons ecosystem: implement features, automated moderation pipelines, reviewer tools, observability, deployments, incident response, and security-focused improvements while collaborating across product, design, QA, and community contributors.

Design and implement secure Linux-based product, network, and server architectures with automation. Lead cloud infrastructure and application deployment projects, support regulatory and product security management, and advise on APIs (REST, MQTT, OPC-UA). Work in a cross-functional team using containerization, CI/CD, and infrastructure-as-code tools.

Audit, design, deploy and lead endpoint security architectures across Windows, macOS and mobile. Implement and harden EDR/XDR solutions (Microsoft Defender, Intune, BitLocker), mentor client teams, manage incidents, and ensure compliance with frameworks like ANSSI and NIST.

Enterprise-focused sales specialist driving adoption of SASE and networking security solutions. Build and manage pipeline, collaborate with account teams and partners, position SASE offerings, win new logos, and grow/renew revenue in mid-to-large accounts.

Provide strategic procurement and contract advice across major public and private projects, lead end-to-end procurement processes, support post-contract management under NEC4, develop procurement services and supply-chain intelligence, contribute to business development, and mentor/manage teams while supporting CIPS/MCIPS accreditation.

Own and execute the indirect commercial strategy: design a partner programme, recruit and onboard partners, source and qualify first opportunities with partners, manage and enable long-term partner relationships, represent the company at industry events, and maintain disciplined indirect forecasting and CRM-driven reporting.

Own direct revenue for enterprise, government and OEM accounts: define commercial strategy, prospect, qualify opportunities, construct proposals and RFP responses, manage forecasting and CRM discipline, and represent the company at industry events.

Design, build, and harden Chromium-based browser components in C++ to power Menlo's AI/agent initiatives; apply networking and HTTP security expertise; integrate AI agents and MCP servers; build tooling in Python or Rust; deploy and operate cloud infrastructure (AWS/GCP, Kubernetes, Terraform); debug and optimize performance-critical systems; collaborate cross-functionally.

Design, build, and operate Threat Protection and ShadowAI services: scalable distributed systems and APIs that detect and control risky web and generative AI usage. Own features end-to-end, maintain availability and latency SLOs, write tests, perform code reviews, use AI-assisted tools, and collaborate with cross-functional teams to improve detection accuracy and production reliability.

Own the Nordics & Benelux region, build and manage strategic account pipelines, run consultative sales processes with CISOs and security leaders, deliver outcome-based demos with Solutions Engineers, collaborate with partners and internal teams, and accurately forecast revenue to close high-impact deals.

Own a UK region and build a pipeline of strategic, high-value accounts. Execute consultative account plans from prospecting through close, engage CISOs and security leaders, deliver outcome-based demos with Solutions Engineers, collaborate with partners and internal teams, accurately forecast revenue, and contribute go-to-market feedback.

Design, build, and operate multi-region VM and Kubernetes infrastructure on GCP and AWS. Lead IaC standards with Terraform/Spacelift, implement observability (Grafana/Prometheus/OTel), manage core platform services (DNS, certs, ingress, service mesh), drive automation and CI/CD, mentor engineers, and participate in 24x7 on-call incident response and post-incident reviews.

Develop and extend Menlo Security's web isolation remote browser technology across desktop and mobile. Work on Chromium internals, networking, video/audio, HTML5 features (WebGL/WebRTC), containerization, scaling and load balancing with a strong systems-level Linux and security focus.

Build and own end-to-end TypeScript features across a monorepo: design typed HTTP APIs, model and query PostgreSQL, implement React SPAs with modern tooling, write unit/integration tests, use AI-assisted tools responsibly, review code, and collaborate with Product and QA to ship secure, reproducible software.