Interview Prep Guide

AWS Well-Architected Production Interview Questions

AWS architecture questions covering identity, reliability, observability, networking, cost, data protection, and incident recovery.

Applied AWS Questions

  1. How do security groups and network ACLs differ?

    Security groups are stateful controls attached to resources; network ACLs are stateless subnet-level controls with explicit inbound and outbound evaluation.

  2. How would you choose between SQS, SNS, and EventBridge?

    Choose SQS for durable queue consumption, SNS for push fan-out, and EventBridge for routed event integration and filtering.

  3. What should an AWS observability strategy include?

    Use metrics, structured logs, traces, audit events, service-level indicators, and actionable alerts tied to ownership and runbooks.

  4. How do you manage secrets and temporary credentials on AWS?

    Prefer workload identities and short-lived role credentials, store secrets in managed services, rotate them, and restrict retrieval by purpose.

Advanced AWS Questions

  1. How would you design for multi-AZ reliability?

    Distribute stateless capacity and stateful replicas, remove single-zone dependencies, automate health routing, and test recovery against defined objectives.

  2. How do RTO and RPO guide disaster-recovery architecture?

    RTO defines acceptable recovery time and RPO acceptable data loss; together they determine replication, backup, automation, and cost choices.

  3. How would you control AWS cost without harming reliability?

    Allocate and measure cost, remove waste, match capacity to demand, use appropriate commitments, optimize data transfer, and validate changes against service objectives.

  4. How would you protect an internet-facing AWS API?

    Combine edge controls, TLS, identity, authorization, throttling, validation, private service boundaries, least privilege, logging, and incident response.

AWS Architecture Scenarios

  1. Traffic increases tenfold during a sale. How do you prepare the AWS workload?

    Load-test the full path, identify quotas and bottlenecks, pre-scale where needed, add caching and queues, degrade safely, and rehearse operational response.

  2. An IAM credential may be compromised. What are your first actions?

    Contain access, revoke or rotate credentials, preserve evidence, inspect audit activity and affected resources, remediate persistence, and communicate through the incident process.

  3. A regional dependency fails. How do you decide whether to fail over?

    Use tested health criteria, data-consistency status, recovery objectives, capacity readiness, and business impact rather than a single alarm.

Additional Frequently Tested Questions

  1. How do multiple Availability Zones improve reliability?

    They place redundant capacity in separate failure domains so a workload can continue when one zone loses service.

  2. How should backup success be verified?

    Restore backups regularly into a controlled environment and prove the recovered data and application meet defined recovery-point and recovery-time objectives.

  3. Why should distributed workloads use bounded retries with jitter?

    Backoff reduces request rate during failure and jitter prevents many clients from retrying in synchronized waves.

  4. What does designing for graceful degradation mean in AWS?

    It means preserving the core customer outcome when a nonessential dependency or feature is unavailable.