Interviewing a cloud engineer means testing real depth across compute, networking, IAM, and infrastructure as code, not just service-name familiarity. Assess how they design for high availability and disaster recovery, enforce least-privilege access, control cloud spend, and automate provisioning. Strong candidates reason about tradeoffs, write maintainable Terraform or CloudFormation, and treat security and cost as first-class design constraints.
Push past surface-level service knowledge into design tradeoffs: how they structure networks, scope IAM, and recover from failure. Ask them to reason about a real architecture and to explain how their infrastructure-as-code stays repeatable and reviewable. The strongest cloud engineers automate relentlessly, design least-privilege by default, test their disaster-recovery procedures, and can defend cost-optimization decisions with concrete numbers and reasoning.
Design a highly available web application across multiple availability zones. Walk me through compute, load balancing, data, and failure modes.
What to look for: Multi-AZ redundancy, autoscaling, a managed or replicated datastore, health checks and failover, and an honest discussion of single points of failure and recovery behavior.
How do you structure your Terraform (or CloudFormation/Bicep) so environments are repeatable and changes are safe to apply?
What to look for: Modular reusable code, remote state with locking, separate workspaces or accounts per environment, plan-review before apply, and avoiding manual console drift.
Explain how you'd design IAM for a team with least privilege. How do you avoid both over-permissioning and operational gridlock?
What to look for: Role-based access, scoped policies, avoiding wildcards, using groups/roles over long-lived keys, and periodic access review balanced against developer velocity.
Walk me through a VPC design: subnets, routing, security groups, and how traffic reaches a private workload safely.
What to look for: Public/private subnet separation, NAT or gateway design, least-open security groups, and secure ingress patterns rather than opening broad ranges.
Your monthly cloud bill jumped 30% with no obvious cause. How do you investigate and bring it down?
What to look for: Cost-allocation tags, cost explorer/anomaly tools, right-sizing, identifying idle or orphaned resources, reserved/savings plans, and a FinOps mindset rather than guessing.
How do you design and validate a disaster-recovery plan? How do you set and prove RTO and RPO?
What to look for: Backup and replication strategy, defined recovery objectives, runbooks, and actually testing failover rather than assuming the plan works.
Tell me about a production outage in cloud infrastructure you helped resolve. What was the root cause and the fix?
What to look for: A clear diagnosis, a permanent fix not just a restart, and a follow-up such as added monitoring, an IaC change, or improved alerting.
Describe a piece of infrastructure you migrated to infrastructure as code. What changed afterward?
What to look for: Reduced drift, faster repeatable provisioning, version control and review, and an honest account of the migration challenges.
Give an example of a cost-optimization effort you led and its measurable impact.
What to look for: Specific levers pulled, before/after savings, and ensuring performance and availability weren't sacrificed for cost.
Tell me about a time you removed infrastructure friction for a development team.
What to look for: Self-service environments, automation, clear runbooks, and partnership rather than gatekeeping.
A deployment to production needs zero downtime, but it includes a database schema change. How do you approach it?
What to look for: Backward-compatible migrations, blue/green or canary rollout, decoupling schema changes from code changes, and a rollback plan.
An engineer asks for broad admin access to ship faster. How do you respond without becoming a blocker?
What to look for: Offering scoped roles, temporary elevated access with expiry, or a self-service path, holding least-privilege while still enabling speed.
You inherit an account with no IaC, manual changes everywhere, and unclear ownership. Where do you start?
What to look for: Discovery and inventory, importing critical resources into IaC, tightening obvious security/cost issues first, and incremental codification rather than a risky big-bang rewrite.
A workload is hitting scaling limits during traffic spikes. How do you diagnose and fix it?
What to look for: Identifying the bottleneck (compute, connections, database), tuning autoscaling, caching, load testing, and validating with metrics rather than over-provisioning blindly.
How do you document cloud architecture and runbooks so others can operate what you build?
What to look for: Clear diagrams, decision records, runbooks for common operations and incidents, and keeping docs current as infrastructure changes.
How do you partner with developers when their app design conflicts with cloud cost or security best practice?
What to look for: Explaining tradeoffs, proposing alternatives, and finding a workable middle ground rather than dictating or rubber-stamping.
How do you set up monitoring and on-call so the team learns about issues before customers do?
What to look for: Meaningful alerts on the right signals, actionable runbooks, avoiding alert fatigue, and a shared on-call culture rather than one person owning all pages.
How do you stay current with cloud services and bring useful changes back to your team?
What to look for: A genuine learning habit, evaluating new services critically against real needs, and sharing knowledge rather than chasing hype.
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