I started with public vs private subnets and worked outward from there.
Start by clarifying requirements (e.g., number of tiers, public/private resources, compliance needs), then walk through a standard multi-AZ VPC design with public and private subnets, route tables, and gateways. Emphasize security, high availability, and cost trade-offs, and explain how each component enables specific traffic flows.
Pro tip: Mention that NAT Gateways are for outbound internet access from private subnets, while Internet Gateways are for bidirectional traffic to public subnets—and note that NAT Gateways are managed, highly available, and cost more than NAT instances. This shows you understand both architecture and operational cost.
Ask about the number of tiers (web, app, database), whether resources need public internet access, compliance requirements (e.g., Boeing may have strict security), and expected traffic patterns. This ensures your design meets the actual needs.
Choose a CIDR block (e.g., 10.0.0.0/16) and divide into subnets across at least two Availability Zones for high availability. Create public subnets for internet-facing resources and private subnets for backend resources, with separate subnets for each tier if needed.
Attach an Internet Gateway to the VPC for public subnets, and create a route table with a default route to the IGW. For private subnets, create a route table with a default route to a NAT Gateway (placed in a public subnet) to allow outbound internet access without inbound exposure.
Use security groups and network ACLs to control traffic at instance and subnet levels. Deploy NAT Gateways in multiple AZs for redundancy, and consider VPC endpoints for private access to AWS services without traversing the internet.
Mention cost implications (NAT Gateway vs. NAT instance), complexity of multi-AZ vs. single-AZ, and when to use VPC peering or Transit Gateway for hybrid connectivity. Tailor to Boeing's likely need for secure, compliant architectures.
AI-generated suggestions, not part of the candidate's original notes. May be inaccurate — verify before relying on them.
Knew this one pretty well from a past project.
Start by explaining the core mechanism of pre-signed URLs: they are time-limited URLs generated using the signer's credentials that grant temporary access to a specific S3 object. Then, discuss the trade-offs and use cases for uploads versus downloads, emphasizing security, scalability, and the principle of least privilege. Finally, tie it back to real-world scenarios, especially in aerospace or defense contexts where data integrity and access control are critical.
Pro tip: Mention that pre-signed URLs can be generated for both PUT and GET operations, and highlight that for uploads, you can enforce conditions like content length and checksum to prevent tampering—a key consideration in secure environments like Boeing's.
Describe how pre-signed URLs are created using AWS credentials and include a signature that authorizes a specific operation on an S3 object for a limited time.
For uploads, pre-signed URLs allow clients to upload directly to S3 without exposing credentials, reducing server load. For downloads, they provide temporary access to private objects without making them public.
Highlight that pre-signed URLs are secure if scoped narrowly (e.g., specific object, short expiry) but can be misused if overly permissive. Mention the trade-off between convenience and control.
Emphasize how pre-signed URLs can be used in secure data pipelines, such as allowing suppliers to upload parts data or enabling engineers to download sensitive documents without broad S3 access.
AI-generated suggestions, not part of the candidate's original notes. May be inaccurate — verify before relying on them.
Blanked a little on a specific scenario they threw at me about a Lambda needing read access to one S3 bucket but not others.
Start by defining least privilege as granting only the permissions required to perform a task, then walk through how you apply it across IAM roles, policies, and service-to-service permissions. Use a concrete example from your experience to illustrate your process, and highlight trade-offs between security and operational efficiency.
Pro tip: Emphasize that least privilege is an ongoing process, not a one-time setup—mention regular access reviews and automated tools to detect and remediate overly permissive policies. In a high-security environment like Boeing, showing awareness of compliance and audit requirements will set you apart.
Briefly explain that least privilege means granting the minimum permissions necessary for a user or service to perform its function, reducing attack surface and blast radius. Highlight its criticality in regulated industries like aerospace.
Describe how you design roles with specific, narrowly scoped permissions, avoiding wildcards. Use role-based access control (RBAC) and just-in-time elevation for temporary needs.
Explain how you write policies that specify exact actions, resources, and conditions (e.g., IP restrictions, MFA). Use policy validation tools and automated analysis to catch overly permissive statements.
Discuss using service accounts with minimal permissions, mutual TLS, and short-lived credentials. Avoid hard-coded secrets and use identity federation where possible.
Emphasize continuous monitoring with tools like AWS IAM Access Analyzer or CloudTrail, regular access reviews, and automated remediation of policy drift. Mention the importance of logging and auditing for compliance.
AI-generated suggestions, not part of the candidate's original notes. May be inaccurate — verify before relying on them.