Hakuna Matata Tech Cloud Engineer Interview: Rounds, Questions and Preparation

What the job involves

As a Cloud Engineer at an Indian IT services or fast-growing product company, you will help build, deploy, and maintain cloud infrastructure on platforms like AWS, Azure, or GCP. Day to day work includes writing infrastructure-as-code, setting up CI/CD pipelines, monitoring systems, and supporting client environments. You will often work in shifts or on-call rotations to ensure high availability for customers.

Role and Technical Knowledge

1. 1

   What is the difference between a security group and a network ACL in AWS?

   Explain that security groups are stateful and operate at the instance level, while network ACLs are stateless and operate at the subnet level. Mention default rules and use cases.

2. 2

   How would you host a simple static website on AWS with low cost?

   Cover S3 static hosting, Route 53 for DNS, CloudFront for CDN, and optionally ACM for SSL. Highlight cost optimisation by avoiding EC2.

3. 3

   What is Infrastructure as Code, and why is it useful for a services company?

   Define IaC as managing infrastructure through code files. Mention repeatability, version control, reduced manual errors, and faster client deployments.

4. 4

   Explain the difference between vertical and horizontal scaling in cloud.

   Vertical means increasing instance size, horizontal means adding more instances. Discuss when to use each, and mention auto scaling groups for horizontal scaling.

Practical Scenarios

1. 5

   A client reports that their website is slow during peak hours. How would you investigate and fix it?

   Start with monitoring tools like CloudWatch or Grafana to check CPU, memory, and network. Suggest adding a load balancer, caching with CloudFront or Redis, and scaling out with auto scaling.

2. 6

   You need to deploy the same application to three different client environments with minor changes. How would you approach this?

   Use Terraform workspaces or parameterised templates. Keep environment specific variables separate. Mention CI/CD pipelines with approval gates.

3. 7

   What steps would you take if an EC2 instance is not reachable via SSH?

   Check security group rules, network ACLs, route tables, instance status checks, and key pair permissions. Also verify the instance is in a public subnet or has a bastion host.

4. 8

   How would you reduce cloud costs for a small client with a monthly bill that is growing?

   Suggest rightsizing instances, using reserved instances or savings plans, deleting unused resources, setting up billing alarms, and moving cold data to cheaper storage tiers.

Behavioural and Situational

1. 9

   Tell me about a time you learned a new technology quickly for a project or assignment.

   Use the STAR method. Focus on the steps you took, resources used, and the outcome. Show curiosity and self learning.

2. 10

   How would you handle a situation where a senior engineer gives you feedback that you disagree with?

   Show respect, ask clarifying questions, and explain your reasoning with data. Be open to changing your mind if the feedback is valid.

3. 11

   Describe a time you worked in a team to solve a problem under time pressure.

   Highlight communication, task division, and staying calm. Mention the result and what you learned about teamwork.

4. 12

   Why do you want to work as a Cloud Engineer in an IT services company?

   Talk about exposure to multiple clients and technologies, learning opportunities, and the chance to solve real business problems. Avoid saying you only want to work on one cloud provider.

HR and Company Fit

1. 13

   Are you comfortable working in rotational shifts or being on call for client support?

   Be honest but positive. If you are flexible, say so and mention that you understand cloud services often need 24/7 support. If not, explain how you manage availability.

2. 14

   Where do you see yourself in three years as a Cloud Engineer?

   Show a clear growth path, such as moving from associate to cloud engineer, earning certifications like AWS Solutions Architect, and taking more ownership of client infrastructure.

3. 15

   What do you know about our company and why do you want to join us?

   Research the company's services, clients, and culture. Mention specific projects or values that appeal to you. Connect your skills to their needs.

4. 16

   How do you keep your cloud knowledge up to date?

   Mention blogs, official documentation, YouTube channels, hands-on labs, and certifications. Show that you learn continuously, not just during exams.