GCP Cloud Engineer interview questions & mock practice
A GCP Cloud Engineer interview in 2026 runs across 4 rounds — cloud fundamentals, networking & iam, iac & automation, scenario & culture fit. Below are the most-asked GCP Cloud Engineer interview questions and a focused prep plan. Rehearse every answer with OnJob's free AI mock interview and get instant, specific feedback before the real one.
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The GCP Cloud Engineer interview process
Google Cloud services, networking, IAM and infrastructure as code — the cloud interview for product companies and enterprises running GCP workloads across India.
Cloud fundamentals
Projects, regions, zones, the resource hierarchy and core GCP services.
Networking & IAM
VPCs, firewall rules, load balancing, IAM roles and service accounts.
IaC & automation
Terraform or Deployment Manager and CI/CD with Cloud Build.
Scenario & culture fit
Designing a scalable, cost-aware architecture; troubleshooting and team fit.
Most-asked GCP Cloud Engineer interview questions
12 of the questions GCP Cloud Engineer candidates are asked most often in India. Practise answering each one out loud in your AI mock interview.
- 1. Explain the GCP resource hierarchy: organisation, folders, projects and resources.
- 2. What is the difference between a region and a zone in Google Cloud?
- 3. When would you choose Compute Engine, App Engine, Cloud Run or GKE for a workload?
- 4. How does IAM work in GCP, and what is the difference between primitive, predefined and custom roles?
- 5. What are service accounts, and how do you grant a workload access to other GCP services securely?
- 6. What is the difference between Cloud Storage, Persistent Disk and Filestore?
- 7. Explain the difference between Cloud SQL, Spanner, Bigtable and Firestore, and when to use each.
- 8. How do VPC networks, subnets and firewall rules work in GCP?
- 9. What is the difference between a global and a regional load balancer in Google Cloud?
- 10. How do you manage secrets in GCP using Secret Manager?
- 11. How would you design an autoscaling, highly available web service on GCP?
- 12. Tell me about a time you optimised GCP costs or resolved a production incident.
How to prepare for your GCP Cloud Engineer interview
Know the compute spectrum — Compute Engine, App Engine, Cloud Run and GKE — and when each is the right call.
Understand the data services deeply: Cloud SQL, Spanner, Bigtable, Firestore and BigQuery, and the workloads each fits.
Be precise about IAM: roles, service accounts, the principle of least privilege, and workload identity in GKE.
Practice Terraform on GCP and wire a build through Cloud Build, since IaC and CI/CD come up in most rounds.
Prepare a real architecture or incident story covering autoscaling, networking, or a cost optimisation you delivered.
Practise other roles
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Interview prep guides
GCP Cloud Engineer interview — FAQs
What questions are asked in a GCP Cloud Engineer interview?
Common GCP Cloud Engineer interview questions include: Explain the GCP resource hierarchy: organisation, folders, projects and resources. What is the difference between a region and a zone in Google Cloud? When would you choose Compute Engine, App Engine, Cloud Run or GKE for a workload? How does IAM work in GCP, and what is the difference between primitive, predefined and custom roles? Interviews usually run across 4 rounds — Cloud fundamentals, Networking & IAM, IaC & automation, Scenario & culture fit. Practice all of them with instant AI feedback using OnJob's free mock interview.
How many rounds are in a GCP Cloud Engineer interview?
A typical GCP Cloud Engineer interview has 4 rounds: Cloud fundamentals (Projects, regions, zones, the resource hierarchy and core GCP services.); Networking & IAM (VPCs, firewall rules, load balancing, IAM roles and service accounts.); IaC & automation (Terraform or Deployment Manager and CI/CD with Cloud Build.); Scenario & culture fit (Designing a scalable, cost-aware architecture; troubleshooting and team fit.).
How do I prepare for a GCP Cloud Engineer interview?
To prepare for a GCP Cloud Engineer interview: Know the compute spectrum — Compute Engine, App Engine, Cloud Run and GKE — and when each is the right call. Understand the data services deeply: Cloud SQL, Spanner, Bigtable, Firestore and BigQuery, and the workloads each fits. Be precise about IAM: roles, service accounts, the principle of least privilege, and workload identity in GKE. Then run a full AI mock interview on OnJob to rehearse out loud and get instant, specific feedback before the real thing.
What skills do I need for a GCP Cloud Engineer role?
Core GCP Cloud Engineer skills tested in interviews include GCP, Networking, IAM, Terraform, GKE, BigQuery, Cloud Run, Cost Optimisation. OnJob shows you exactly which of these skills stand between you and a 100% match on every live GCP Cloud Engineer job.
Is OnJob's GCP Cloud Engineer mock interview free?
Yes. OnJob's AI mock interview is free to start (₹0) and gives you instant feedback on your answers. Pro (₹99/month) adds unlimited interview-prep AI alongside recruiter tracking and unlimited applications.
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