Staff Security Engineer, Product Security

Aircall is a unicorn, AI-powered customer communications platform used by 22,000+ companies worldwide to drive revenue, resolve issues faster, and scale customer-facing teams. We’re redefining customer communications by bringing voice, SMS, WhatsApp, and AI together into one seamless workspace.
Our momentum comes from a simple idea: help teams work smarter, not harder. Aircall’s AI Voice Agent automates routine calls, AI Assist streamlines post-call work, and AI Assist Pro delivers real-time guidance so people can do their best work. The result is higher revenue, faster resolutions, and teams that scale with confidence.
Aircall is headquartered in Paris, our European HQ, with a strong North American presence anchored in Seattle, our North American HQ, and teams across Madrid, London, Berlin, San Francisco, New York City, Sydney, and Mexico City. We’ve built a product customers love and a business that’s scaling quickly, backed by world-class investors and driven by rapid AI innovation across multiple product lines.At Aircall, you’ll join a company in motion. We’re ambitious, product-driven, and execution-focused, with visible impact, fast decisions, and real growth.
How we work at Aircall: We’re customer-obsessed, data-driven, and focused on delivering meaningful outcomes. We value ownership, continuous learning, and thoughtful speed. If you thrive in a collaborative, fast-moving environment where trust and impact matter, you’ll feel at home here.
As a Staff Security Engineer, Product Security, you will drive Aircall’s product security strategy and execution by embedding security into the product lifecycle — from design to deployment. You will partner closely with Engineering, Product, and Platform leaders to ensure Aircall’s systems are secure, resilient, and reliable by default, risks are proactively mitigated, and security enables teams to ship quickly and safely without compromising availability or customer trust.
This is a Staff-level role, which means you will operate with broad scope and significant autonomy, owning cross-cutting initiatives that improve product security maturity and system reliability across teams. You will be expected to influence architecture and development practices at scale, set technical direction, create repeatable patterns and guardrails, and mentor engineers across the organization — not only solving security problems, but ensuring solutions are durable, scalable, and operationally sound over time.

Responsibilities:

• Drive and scale secure-by-design practices across product and engineering teams, integrating security into design, development, CI/CD, and release workflows.
• Lead security design and architecture reviews for major product initiatives; define security requirements, controls, and patterns that teams can adopt consistently.
• Own and evolve threat modeling practices, ensuring risks are systematically identified early and mitigations are validated.
• Perform deep technical assessments (manual code review, targeted security testing, validation of fixes) for high-impact findings and critical services.
• Identify and reduce classes of vulnerabilities across Aircall’s codebases and services (e.g., auth/authz flaws, injection, logic issues, SSRF, API security, cloud misconfigurations).
• Build and improve security tooling and automation that scales across engineering (e.g., guardrails, CI checks, policy-as-code, leveraging AI for autonomous security-review processes  that don’t slow delivery).
• Triage and drive remediation of vulnerabilities discovered through internal testing, automated detection, and external reports (including coordinated disclosure where applicable).
• Investigate and respond to product security incidents, helping with containment, root cause analysis, and prevention. Participate in on-call/threat-response rotations, escalating and coordinating during high-severity events.
• Stay up to date on attacker techniques (MITRE ATT&CK, red team reports, threat intel) and propose new detection patterns or responses accordingly.
• Serve as a trusted advisor to engineering and product leadership, translating security risks into pragmatic, prioritized actions and tradeoffs.
• Own cross-team product security initiatives (e.g., secure SDLC improvements, secure design frameworks, security champions, org-wide security patterns and standards).
• Mentor and up-level engineers across security and product teams through reviews, pairing, coaching, and security education.

Should have:

• 8+ years of relevant experience in Product Security / Application Security / Secure Software Engineering (or equivalent).
• Proven track record of leading product security work across multiple teams and influencing architecture and SDLC maturity at scale.
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