To succeed in the Aircall interview process, you must demonstrate mastery across several core domains. Below is a breakdown of the primary evaluation areas, what they entail, and how you can prepare.
Threat Modeling and Architecture Review
This area is critical because Aircall continuously ships new features and integrations that must be secure by design. Interviewers will evaluate your ability to look at a complex system, identify potential threat vectors, and propose robust security controls. Strong performance means you can systematically break down an architecture, prioritize risks based on business impact, and design pragmatic defenses.
Be ready to go over:
- Data flow analysis – Mapping how sensitive data (like PII or VoIP streams) moves through a system and identifying trust boundaries.
- Threat frameworks – Utilizing methodologies like STRIDE or PASTA to systematically uncover vulnerabilities in proposed designs.
- Mitigation strategies – Designing scalable security controls such as rate limiting, encryption in transit/at rest, and zero-trust principles.
- Advanced concepts (less common) – Securing WebRTC architectures, voice-specific attack vectors (like SIP toll fraud), and complex microservices mesh security.
Example questions or scenarios:
- "Walk me through how you would threat model a new integration between Aircall and a third-party CRM like Salesforce."
- "If we are designing a new real-time transcription service for voice calls, what are the primary security risks, and how would you mitigate them?"
- "Describe a time you found a fundamental architectural flaw late in the development lifecycle. How did you handle it?"
Application Security and Vulnerability Management
As a Product Security expert, you are the last line of defense against application-layer attacks. This area tests your knowledge of common vulnerabilities, secure coding practices, and how to embed security tooling into the CI/CD pipeline. We look for candidates who can go beyond simply running a scanner to actually understanding the root cause of vulnerabilities and helping developers fix them.
Be ready to go over:
- OWASP Top 10 and beyond – Deep understanding of injection, broken authentication, SSRF, IDOR, and modern API security flaws.
- Security tooling – Practical experience integrating SAST, DAST, and SCA tools into development pipelines without slowing down engineering velocity.
- Authentication and Authorization – Mastery of OAuth 2.0, SAML, OIDC, and role-based access control (RBAC) implementations.
- Advanced concepts (less common) – Bypassing modern WAFs, exploiting complex race conditions, and cryptographic implementation flaws.
Example questions or scenarios:
- "How would you explain the impact of an Insecure Direct Object Reference (IDOR) vulnerability to a junior developer, and how would you guide them to fix it?"
- "We want to implement a new SAST tool across 50 engineering teams. How do you roll this out to ensure high adoption and low friction?"
- "Walk me through the flow of OAuth 2.0. Where are the most common security pitfalls when developers implement it?"
Cloud Security and DevSecOps
Aircall operates entirely in the cloud, meaning our infrastructure security is deeply intertwined with our product security. You will be evaluated on your ability to secure AWS environments, manage identity and access, and ensure that our infrastructure as code (IaC) is secure by default.
Be ready to go over:
- AWS Security – Deep knowledge of IAM, S3 policies, Security Groups, VPCs, and AWS-native security services.
- Container and Kubernetes Security – Securing Docker images, managing Kubernetes RBAC, and understanding container escape vectors.
- Infrastructure as Code (IaC) – Writing secure Terraform configurations and implementing automated checks for misconfigurations.
- Advanced concepts (less common) – Cloud-native incident response, advanced AWS IAM privilege escalation paths, and serverless security.
Example questions or scenarios:
- "How do you ensure that developers cannot accidentally expose an S3 bucket or an internal API to the public internet?"
- "Describe your approach to managing secrets and credentials in a highly distributed microservices environment."
- "If an alert triggers showing unusual cross-account IAM role assumption in our AWS environment, what are your immediate next steps?"
Leadership and Cross-Functional Influence
As a Staff Security Engineer, your technical skills must be matched by your ability to lead. This area evaluates how you drive consensus, mentor others, and build a security-conscious culture. Strong candidates demonstrate emotional intelligence, strategic thinking, and the ability to align security goals with business objectives.
Be ready to go over:
- Stakeholder management – Balancing product deadlines with essential security requirements.
- Mentorship – Elevating the security knowledge of the broader engineering organization through training or champion programs.
- Strategic planning – Building and executing a multi-quarter product security roadmap.
- Advanced concepts (less common) – Leading incident response communications with executive leadership or managing external bug bounty relationships.
Example questions or scenarios:
- "Tell me about a time you had to block a major product release due to a critical security issue. How did you manage the relationship with the product manager?"
- "How do you scale security knowledge across an engineering team of 200+ developers when you are the only security engineer?"
- "Describe a major security initiative you proposed, designed, and drove to completion. What was the impact?"
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