Cloud Engineer (AWS) interview questions & mock practice
What interview questions are asked for a Cloud Engineer (AWS)?
A Cloud Engineer (AWS) interview in 2026 runs across 4 rounds — aws fundamentals, networking & security, architecture round, scenario / troubleshooting. Below are the most-asked Cloud Engineer (AWS) interview questions and a focused prep plan. Rehearse every answer out loud with the free timed practice below before the real one.
- AWS
- EC2 / S3
- IAM
- VPC
- Terraform
- Lambda
- Cloud Architecture
Free interview practice · Cloud Engineer (AWS)
Practise your Cloud Engineer (AWS) interview now — free
Step through the 12 most-asked Cloud Engineer (AWS) questions one at a time, under a timer, just like the real thing. Jot your answer, then reveal what a strong answer covers. No signup needed to practise.
The Cloud Engineer (AWS) interview process
AWS core services, networking, IAM and architecture — the cloud-engineering interview for cloud-native teams and companies migrating to AWS.
1. AWS fundamentals
EC2, S3, IAM, VPC and core managed services.
2. Networking & security
VPCs, subnets, security groups, IAM policies and encryption.
3. Architecture round
Design a scalable, highly available AWS architecture.
4. Scenario / troubleshooting
Cost optimisation and debugging a cloud issue.
Most-asked Cloud Engineer (AWS) interview questions
12 of the questions Cloud Engineer (AWS) candidates are asked most often in India. Practise answering each one out loud in the timed practice above.
- 1. What is the difference between EC2, Lambda, and ECS/Fargate?
- 2. Explain the difference between S3 storage classes and when you'd use each.
- 3. What is the difference between a security group and a network ACL?
- 4. How does IAM work — explain users, roles, policies and the principle of least privilege?
- 5. What is a VPC, and how do public and private subnets differ?
- 6. Explain the difference between a NAT gateway and an internet gateway.
- 7. How do you design a highly available, fault-tolerant architecture on AWS?
- 8. What is the difference between horizontal and vertical scaling, and how do Auto Scaling groups help?
- 9. Explain the difference between Amazon RDS, DynamoDB and Aurora.
- 10. How do you secure data at rest and in transit on AWS?
- 11. What is CloudFormation / Terraform, and why use infrastructure as code?
- 12. How would you reduce the AWS bill for an over-provisioned environment?
How to prepare for your Cloud Engineer (AWS) interview
Know the core services cold: EC2, S3, IAM, VPC, RDS, Lambda, and load balancers — and when to use each.
Understand networking and security deeply: VPCs, subnets, route tables, security groups, NACLs and IAM policies.
Be able to whiteboard a highly available, multi-AZ architecture and justify your choices.
Learn infrastructure as code (Terraform or CloudFormation) and basic cost-optimisation levers.
Consider an AWS certification (Solutions Architect Associate) — many roles screen for it.
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Interview prep guides
Cloud Engineer (AWS) interview — FAQs
What questions are asked in a Cloud Engineer (AWS) interview?
Common Cloud Engineer (AWS) interview questions include: What is the difference between EC2, Lambda, and ECS/Fargate? Explain the difference between S3 storage classes and when you'd use each. What is the difference between a security group and a network ACL? How does IAM work — explain users, roles, policies and the principle of least privilege? Interviews usually run across 4 rounds — AWS fundamentals, Networking & security, Architecture round, Scenario / troubleshooting. Practise them with the free timed practice on this page.
How many rounds are in a Cloud Engineer (AWS) interview?
A typical Cloud Engineer (AWS) interview has 4 rounds: AWS fundamentals (EC2, S3, IAM, VPC and core managed services.); Networking & security (VPCs, subnets, security groups, IAM policies and encryption.); Architecture round (Design a scalable, highly available AWS architecture.); Scenario / troubleshooting (Cost optimisation and debugging a cloud issue.).
How do I prepare for a Cloud Engineer (AWS) interview?
To prepare for a Cloud Engineer (AWS) interview: Know the core services cold: EC2, S3, IAM, VPC, RDS, Lambda, and load balancers — and when to use each. Understand networking and security deeply: VPCs, subnets, route tables, security groups, NACLs and IAM policies. Be able to whiteboard a highly available, multi-AZ architecture and justify your choices. Then rehearse every question out loud with the timed practice on this page before the real thing.
What skills do I need for a Cloud Engineer (AWS) role?
Core Cloud Engineer (AWS) skills tested in interviews include AWS, EC2 / S3, IAM, VPC, Terraform, Lambda, Cloud Architecture. OnJob shows you exactly which of these skills stand between you and a 100% match on every live Cloud Engineer (AWS) job.
Is the Cloud Engineer (AWS) mock interview practice free?
Yes. The questions, the answer guidance and the timed practice on this page are free and need no signup. With a free OnJob account you can also take timed role tests and free certification tests. Personalised AI role and skill tests are part of the paid plans.
Ace your Cloud Engineer (AWS) interview
Rehearse every Cloud Engineer (AWS) question out loud on this page, then sign in to take a timed role test or a free certification in the OnJob practice hub.