Cloud Engineer • Behavioral • hard

Tell me about a major cloud outage you experienced. How did you respond?

#Outage #On-Call

Practice

Cloud Engineer • Behavioral • hard

Describe a time you migrated a critical workload to the cloud with zero downtime.

#Cloud Migration

Practice

Cloud Engineer • Behavioral • easy

How do you stay updated with new cloud services and features?

#Continuous Learning

Practice

Cloud Engineer • Behavioral • medium

Tell me about a time you significantly reduced cloud infrastructure costs.

#FinOps #Impact

Practice

Cloud Engineer • Behavioral • medium

Describe a situation where you had to choose between two cloud architectures. How did you decide?

#Architecture #Tradeoffs

Practice

Cloud Engineer • Behavioral • medium

Tell me about a time you improved the reliability of a cloud-based data system.

#SRE #Impact

Practice

Cloud Engineer • Behavioral • medium

How do you communicate a complex cloud architecture to non-technical stakeholders?

#Stakeholders

Practice

Cloud Engineer • Behavioral • medium

Describe your experience with incident post-mortems. What do you include?

#Post-Mortem #Learning

Practice

Cloud Engineer • Behavioral • medium

Tell me about a time you caused a significant production outage. How did you handle the immediate mitigation, and what was the post-mortem process?

#Incident Management #Ownership #Blameless Culture

Practice

Cloud Engineer • Behavioral • medium

Describe a situation where you strongly disagreed with a senior engineer or a cross-functional partner on an architectural decision. How did you resolve the conflict?

#Conflict Resolution #Communication #Data-Driven Decisions

Practice

Cloud Engineer • Behavioral • medium

Tell me about a time you had to optimize a system or infrastructure to reduce costs or improve efficiency. What metrics did you use to measure success?

#Efficiency #Impact #Metrics

Practice

Cloud Engineer • Coding • medium

Given a massive, 100GB web server log file, write a script to find the top K most frequent IP addresses making requests. The script must run on a machine with only 4GB of RAM.

#Log Parsing #Memory Management #Heaps #Hash Maps

Practice

Cloud Engineer • Coding • medium

Write a concurrent script in Python or Go to monitor a local directory for new files and upload them to a remote storage service. It must handle network failures and retries gracefully.

#Concurrency #Error Handling #File I/O #Asynchronous Programming

Practice

Cloud Engineer • Coding • easy

Write a function to validate if a given string is a valid IPv4 or IPv6 address. Do not use built-in IP validation libraries.

#String Manipulation #Validation #Edge Cases

Practice

Cloud Engineer • Coding • hard

Implement a thread-safe bounded blocking queue. It should support enqueue and dequeue operations, blocking if the queue is full or empty, respectively.

#Multithreading #Synchronization #Data Structures

Practice

Cloud Engineer • System Design • hard

Design a data lake on AWS using S3, Glue, and Athena.

#AWS #S3 #Athena

Practice

Cloud Engineer • System Design • hard

How would you set up a streaming data pipeline on GCP using Pub/Sub and Dataflow?

#GCP #Pub/Sub #Dataflow

Practice

Cloud Engineer • System Design • hard

How would you architect a data platform that reduces spend by 40% without impacting performance?

#FinOps #Cloud

Practice

Cloud Engineer • System Design • hard

How do you implement disaster recovery for a cloud data warehouse?

#DR #RTO #RPO

Practice

Cloud Engineer • System Design • hard

Design a globally distributed rate limiter for Meta's Graph API. It needs to handle millions of requests per second and enforce limits based on user ID and application ID.

#Rate Limiting #Distributed Systems #Redis #Concurrency

Practice

Cloud Engineer • System Design • hard

Design a photo storage system similar to what Instagram uses. It must handle billions of reads and millions of writes per day with extremely low latency.

#Blob Storage #CDN #Caching #Database Scaling

Practice

Cloud Engineer • System Design • medium

Design a distributed caching system for Meta's newsfeed. How do you handle cache invalidation and the 'thundering herd' problem?

#Caching #Distributed Systems #Memcached

Practice

Cloud Engineer • Technical • hard

Compare AWS, GCP, and Azure for a data-intensive workload. What are the key differentiators?

#AWS #GCP #Azure

Practice

Cloud Engineer • Technical • medium

What is the shared responsibility model in cloud security?

#Cloud Security #IAM

Practice

Cloud Engineer • Technical • easy

Explain IaaS, PaaS, and SaaS with examples.

#IaaS #PaaS #SaaS

Practice

Cloud Engineer • Technical • hard

What is a VPC (Virtual Private Cloud)? How do you design a secure VPC architecture?

#VPC #Security

Practice

Cloud Engineer • Technical • easy

Explain the difference between regions, availability zones, and edge locations.

#Regions #AZs

Practice

Cloud Engineer • Technical • medium

How does auto-scaling work? What are the different scaling strategies?

#Auto-Scaling #EC2

Practice

Cloud Engineer • Technical • medium

What is a cloud-native application? How does it differ from a lifted-and-shifted one?

#Cloud Native #Migration

Practice

Cloud Engineer • Technical • hard

Explain multi-cloud vs hybrid cloud architectures and their tradeoffs.

#Multi-Cloud #Hybrid

Practice

Cloud Engineer • Technical • hard

Explain Kubernetes architecture: control plane, nodes, pods, and services.

#K8s #Containers

Practice

Cloud Engineer • Technical • hard

What is a Kubernetes Operator and when would you build one?

#Operators #CRD

Practice

Cloud Engineer • Technical • hard

How does container networking work in Kubernetes?

#Networking #CNI

Practice

Cloud Engineer • Technical • medium

Explain Kubernetes resource requests vs limits. What happens if a pod exceeds its memory limit?

#Resources #OOM

Practice

Cloud Engineer • Technical • hard

What is a service mesh? Explain how Istio works.

#Istio #Service Mesh

Practice

Cloud Engineer • Technical • hard

How would you set up horizontal pod autoscaling based on custom metrics?

#HPA #Custom Metrics

Practice

Cloud Engineer • Technical • medium

Explain the difference between Docker and containerd.

#Docker #containerd

Practice

Cloud Engineer • Technical • medium

How does a Kubernetes Ingress controller work?

#Ingress #Load Balancing

Practice

Cloud Engineer • Technical • hard

Explain Terraform's state management. What happens if the state file is corrupted?

#IaC #State

Practice

Cloud Engineer • Technical • medium

What is the difference between Terraform and Pulumi?

#Terraform #Pulumi

Practice

Cloud Engineer • Technical • medium

How do you manage secrets in cloud infrastructure? (HashiCorp Vault, AWS Secrets Manager)

#Secrets Management #Vault

Practice

Cloud Engineer • Technical • medium

Explain idempotency in infrastructure provisioning.

#Idempotency #Terraform

Practice

Cloud Engineer • Technical • hard

How do you handle Terraform state across multiple teams?

#State Management #Collaboration

Practice

Cloud Engineer • Technical • hard

Compare AWS EMR, GCP Dataproc, and Azure HDInsight for Spark workloads.

#EMR #Dataproc #Spark

Practice

Cloud Engineer • Technical • medium

Explain the difference between AWS Lambda and EC2 for data processing.

#Lambda #Serverless

Practice

Cloud Engineer • Technical • hard

What is BigQuery Slots? How do you optimize BigQuery query costs?

#GCP #Cost

Practice

Cloud Engineer • Technical • medium

Explain AWS S3 storage classes and lifecycle policies.

#S3 #Cost

Practice

Cloud Engineer • Technical • medium

How does AWS Glue Data Catalog work with Athena?

#Glue #Athena

Practice

Cloud Engineer • Technical • hard

What is zero-trust networking? How do you implement it on cloud?

#Zero Trust #Networking

Practice

Cloud Engineer • Technical • medium

Explain TLS/SSL termination in a cloud load balancer.

#TLS #Load Balancer

Practice

Cloud Engineer • Technical • medium

How do cloud IAM roles and policies work? Explain least-privilege principle.

#IAM #Permissions

Practice

Cloud Engineer • Technical • medium

What is AWS PrivateLink? When would you use it?

#PrivateLink #VPC

Practice

Cloud Engineer • Technical • hard

How would you implement network segmentation for a multi-tier application?

#Security #Subnets

Practice

Cloud Engineer • Technical • medium

What are SLOs, SLAs, and SLIs? How do you define them for a data platform?

#SLO #Reliability

Practice

Cloud Engineer • Technical • hard

Explain chaos engineering. How would you implement it for a data pipeline?

#Chaos Engineering #Fault Injection

Practice

Cloud Engineer • Technical • medium

How do you do capacity planning for a cloud data platform?

#Scaling #Planning

Practice

Cloud Engineer • Technical • easy

What is a runbook? How do you create effective runbooks for data infrastructure?

#Runbook #On-Call

Practice

Cloud Engineer • Technical • medium

Explain the three pillars of observability: logs, metrics, and traces.

#Logs #Metrics #Traces

Practice

Cloud Engineer • Technical • medium

How would you set up CloudWatch dashboards for a data pipeline?

#CloudWatch #AWS

Practice

Cloud Engineer • Technical • medium

What is OpenTelemetry? How does it standardize observability?

#OpenTelemetry #Tracing

Practice

Cloud Engineer • Technical • hard

You are paged because a Linux server is experiencing a high load average (e.g., 40 on a 16-core machine), but CPU utilization is under 10%. How do you troubleshoot this?

#OS Troubleshooting #I/O Wait #Process States

Practice

Cloud Engineer • Technical • medium

Explain the exact difference between an L4 load balancer and an L7 load balancer. Describe how Direct Server Return (DSR) works in a massive scale environment like Meta's.

#Load Balancing #OSI Model #TCP/IP #DSR

Practice

Cloud Engineer • Technical • hard

You notice a sudden spike in 5xx HTTP errors from a specific microservice cluster. Walk me through your exact debugging steps from the edge load balancer down to the application layer.

#Microservices #Debugging #Observability

Practice

Cloud Engineer • Technical • medium

Explain the difference between TCP and UDP. How does the QUIC protocol improve upon TCP, and why would Meta use it for video streaming or WhatsApp calls?

#Protocols #TCP/UDP #QUIC #Latency

Practice

Cloud Engineer • Technical • medium

What happens exactly when a process runs out of memory in Linux? Explain the OOM Killer mechanism and how you would configure a critical database process to avoid being killed.

#Memory Management #OOM Killer #Kernel Tuning

Practice

Meta

The Interview Loop

Recruiter Screen (30 min)

Technical Loop (3-4 Rounds)

Interview Question Bank

Tell me about a major cloud outage you experienced. How did you respond?

Describe a time you migrated a critical workload to the cloud with zero downtime.

How do you stay updated with new cloud services and features?

Tell me about a time you significantly reduced cloud infrastructure costs.

Describe a situation where you had to choose between two cloud architectures. How did you decide?

Tell me about a time you improved the reliability of a cloud-based data system.

How do you communicate a complex cloud architecture to non-technical stakeholders?

Describe your experience with incident post-mortems. What do you include?

Tell me about a time you caused a significant production outage. How did you handle the immediate mitigation, and what was the post-mortem process?

Describe a situation where you strongly disagreed with a senior engineer or a cross-functional partner on an architectural decision. How did you resolve the conflict?

Tell me about a time you had to optimize a system or infrastructure to reduce costs or improve efficiency. What metrics did you use to measure success?

Given a massive, 100GB web server log file, write a script to find the top K most frequent IP addresses making requests. The script must run on a machine with only 4GB of RAM.

Write a concurrent script in Python or Go to monitor a local directory for new files and upload them to a remote storage service. It must handle network failures and retries gracefully.

Write a function to validate if a given string is a valid IPv4 or IPv6 address. Do not use built-in IP validation libraries.

Implement a thread-safe bounded blocking queue. It should support enqueue and dequeue operations, blocking if the queue is full or empty, respectively.

Design a data lake on AWS using S3, Glue, and Athena.

How would you set up a streaming data pipeline on GCP using Pub/Sub and Dataflow?

How would you architect a data platform that reduces spend by 40% without impacting performance?

How do you implement disaster recovery for a cloud data warehouse?

Design a globally distributed rate limiter for Meta's Graph API. It needs to handle millions of requests per second and enforce limits based on user ID and application ID.

Design a photo storage system similar to what Instagram uses. It must handle billions of reads and millions of writes per day with extremely low latency.

Design a distributed caching system for Meta's newsfeed. How do you handle cache invalidation and the 'thundering herd' problem?

Compare AWS, GCP, and Azure for a data-intensive workload. What are the key differentiators?

What is the shared responsibility model in cloud security?

Explain IaaS, PaaS, and SaaS with examples.

What is a VPC (Virtual Private Cloud)? How do you design a secure VPC architecture?

Explain the difference between regions, availability zones, and edge locations.

How does auto-scaling work? What are the different scaling strategies?

What is a cloud-native application? How does it differ from a lifted-and-shifted one?

Explain multi-cloud vs hybrid cloud architectures and their tradeoffs.

Explain Kubernetes architecture: control plane, nodes, pods, and services.

What is a Kubernetes Operator and when would you build one?

How does container networking work in Kubernetes?

Explain Kubernetes resource requests vs limits. What happens if a pod exceeds its memory limit?

What is a service mesh? Explain how Istio works.

How would you set up horizontal pod autoscaling based on custom metrics?

Explain the difference between Docker and containerd.

How does a Kubernetes Ingress controller work?

Explain Terraform's state management. What happens if the state file is corrupted?

What is the difference between Terraform and Pulumi?

How do you manage secrets in cloud infrastructure? (HashiCorp Vault, AWS Secrets Manager)

Explain idempotency in infrastructure provisioning.

How do you handle Terraform state across multiple teams?

Compare AWS EMR, GCP Dataproc, and Azure HDInsight for Spark workloads.

Explain the difference between AWS Lambda and EC2 for data processing.

What is BigQuery Slots? How do you optimize BigQuery query costs?

Explain AWS S3 storage classes and lifecycle policies.

How does AWS Glue Data Catalog work with Athena?

What is zero-trust networking? How do you implement it on cloud?

Explain TLS/SSL termination in a cloud load balancer.

How do cloud IAM roles and policies work? Explain least-privilege principle.

What is AWS PrivateLink? When would you use it?

How would you implement network segmentation for a multi-tier application?

What are SLOs, SLAs, and SLIs? How do you define them for a data platform?

Explain chaos engineering. How would you implement it for a data pipeline?

How do you do capacity planning for a cloud data platform?

What is a runbook? How do you create effective runbooks for data infrastructure?

Explain the three pillars of observability: logs, metrics, and traces.

How would you set up CloudWatch dashboards for a data pipeline?

What is OpenTelemetry? How does it standardize observability?

You are paged because a Linux server is experiencing a high load average (e.g., 40 on a 16-core machine), but CPU utilization is under 10%. How do you troubleshoot this?

Explain the exact difference between an L4 load balancer and an L7 load balancer. Describe how Direct Server Return (DSR) works in a massive scale environment like Meta's.

You notice a sudden spike in 5xx HTTP errors from a specific microservice cluster. Walk me through your exact debugging steps from the edge load balancer down to the application layer.

Explain the difference between TCP and UDP. How does the QUIC protocol improve upon TCP, and why would Meta use it for video streaming or WhatsApp calls?

What happens exactly when a process runs out of memory in Linux? Explain the OOM Killer mechanism and how you would configure a critical database process to avoid being killed.

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