OpenAI
Leading AI research laboratory developing state-of-the-art foundation models like GPT-4.
5 Rounds
~21 Days
Very Hard
The Interview Loop
Recruiter Screen (30 min)
Standard fit check, behavioral questions, and resume overview.
Technical Loop (3-4 Rounds)
Deep dive into domain knowledge, coding, and system design.
Interview Question Bank
DevOps Engineer
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Behavioral
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medium
Tell me about a time you had to debug a critical production outage under extreme pressure. What was your process?
#Incident Response
#Debugging
#Communication
DevOps Engineer
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Behavioral
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medium
Describe a situation where you disagreed with a machine learning researcher or software engineer about infrastructure architecture. How did you resolve it?
#Conflict Resolution
#Collaboration
#Empathy
DevOps Engineer
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Behavioral
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easy
Tell me about a time you automated a tedious process that saved your team significant time.
#Automation
#Initiative
#Impact
DevOps Engineer
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Behavioral
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medium
OpenAI moves incredibly fast. Tell me about a time you had to make a trade-off between doing something 'the right way' and doing it quickly to meet a critical business need.
#Trade-offs
#Technical Debt
#Prioritization
DevOps Engineer
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Behavioral
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medium
Tell me about a time you discovered a significant security vulnerability or misconfiguration in your infrastructure. How did you handle it?
#Security
#Incident Response
#Integrity
DevOps Engineer
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Coding
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medium
Write a script to parse a massive, 500GB log file to find the top 10 IP addresses making requests, optimized for memory constraints.
#File I/O
#Data Structures
#Memory Management
#Streaming
DevOps Engineer
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Coding
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medium
Implement a token bucket rate limiter in Go or Python that can be used across a distributed system.
#Concurrency
#Distributed Systems
#Redis
DevOps Engineer
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Coding
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medium
Write a function to check if a given CIDR block overlaps with a list of existing CIDR blocks in a VPC.
#Networking
#Bit Manipulation
#IP Addressing
DevOps Engineer
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Coding
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medium
Given a list of server dependencies (e.g., A depends on B, B depends on C), write a script to determine the correct startup order.
#Graphs
#Topological Sort
#DFS/BFS
DevOps Engineer
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Coding
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hard
Write a concurrent Go program (or Python with asyncio) to ping 10,000 endpoints and return a list of unreachable ones within a strict 5-second timeout.
#Concurrency
#Networking
#Goroutines
#Asyncio
DevOps Engineer
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Coding
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medium
Implement a basic load balancer in Python that distributes incoming requests to a list of backend servers using a weighted round-robin algorithm.
#Load Balancing
#Math
#Data Structures
DevOps Engineer
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System Design
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hard
Design a distributed checkpointing system for large-scale model training that needs to write terabytes of state data every 10 minutes without blocking GPU execution.
#Distributed Systems
#Storage
#High Throughput
#GPU Infrastructure
DevOps Engineer
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System Design
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hard
Design a high-throughput, low-latency API gateway for LLM inference that handles streaming responses (e.g., Server-Sent Events).
#API Gateway
#Load Balancing
#Streaming
#WebSockets/SSE
DevOps Engineer
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System Design
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medium
Design a CI/CD pipeline for deploying a microservice that serves a new machine learning model to millions of users, ensuring zero downtime.
#Deployment Strategies
#Canary Releases
#Rollbacks
#Testing
DevOps Engineer
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System Design
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hard
Design an auto-scaling system for inference nodes based on custom metrics like queue depth and GPU memory fragmentation, rather than just CPU usage.
#Auto-scaling
#Custom Metrics
#KEDA
#Capacity Planning
DevOps Engineer
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System Design
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medium
Design a highly available internal DNS architecture for a multi-region cloud environment that supports millions of internal queries per second.
#DNS
#Networking
#High Availability
DevOps Engineer
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System Design
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hard
Design a centralized logging architecture capable of ingesting petabytes of logs per day from distributed inference servers with sub-minute search latency.
#Logging
#Big Data
#Elasticsearch
#Kafka
DevOps Engineer
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System Design
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hard
Design a system to securely distribute multi-gigabyte model weights to thousands of edge inference nodes globally with minimal latency and network cost.
#Content Delivery
#Peer-to-Peer
#Security
#Edge Computing
DevOps Engineer
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Technical
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hard
How do you handle Kubernetes node failures in a cluster running long-lived, stateful GPU training jobs?
#Kubernetes
#Fault Tolerance
#StatefulSets
#GPU Scheduling
DevOps Engineer
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Technical
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medium
Explain how you would optimize Docker image builds for a massive Python monorepo to reduce CI times from 45 minutes to under 10 minutes.
#Docker
#CI/CD
#Caching
#Monorepo
DevOps Engineer
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Technical
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medium
How does Terraform handle state lock, and what exactly happens if the state file gets corrupted during a massive infrastructure rollout?
#Terraform
#State Management
#Disaster Recovery
DevOps Engineer
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Technical
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hard
Describe how you would monitor and alert on GPU utilization, memory bottlenecks, and interconnect health across a 10,000-node cluster.
#Prometheus
#DCGM
#GPU Monitoring
#Alerting
DevOps Engineer
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Technical
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hard
What is InfiniBand, and how does RDMA differ from traditional TCP/IP networking in the context of distributed model training?
#InfiniBand
#RDMA
#TCP/IP
#High Performance Computing
DevOps Engineer
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Technical
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medium
How do you manage and rotate secrets in a multi-tenant Kubernetes environment at scale without restarting pods?
#Kubernetes
#Secret Management
#Vault
#Security
DevOps Engineer
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Technical
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easy
Explain the difference between Kubernetes Deployments, StatefulSets, and DaemonSets. When would you use each for AI workloads?
#Kubernetes Resources
#Workload Management
DevOps Engineer
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Technical
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medium
How do you troubleshoot a 'CrashLoopBackOff' error in Kubernetes, specifically if the pod contains a GPU-bound container that fails silently?
#Debugging
#Containers
#GPU
DevOps Engineer
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Technical
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hard
What are the challenges of using Terraform with hundreds of developers, and how do you structure the repositories and state files to prevent bottlenecks?
#Terraform
#Scaling Teams
#Architecture
DevOps Engineer
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Technical
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medium
How do you handle database schema migrations in a zero-downtime CI/CD pipeline?
#CI/CD
#Database Migrations
#Zero Downtime
DevOps Engineer
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Technical
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hard
Explain how Prometheus handles high cardinality data and how you would mitigate a cardinality explosion caused by a misconfigured label.
#Prometheus
#TSDB
#Monitoring
DevOps Engineer
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Technical
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medium
Walk me through the exact lifecycle of a Kubernetes pod from the moment `kubectl apply` is executed to when the container is running.
#Kubernetes Architecture
#API Server
#Kubelet
#Scheduler
DevOps Engineer
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Technical
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hard
How do you secure a multi-tenant Kubernetes cluster where different research teams need strict compute and network isolation?
#Kubernetes Security
#Network Policies
#RBAC
#Multi-tenancy
DevOps Engineer
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Technical
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hard
What is eBPF, and how can it be used for network observability and security in a high-throughput microservices architecture?
#eBPF
#Linux Kernel
#Observability
#Cilium
DevOps Engineer
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Technical
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medium
How do you implement blue-green deployments for a stateful application backed by a relational database?
#Deployment Strategies
#Databases
#Stateful Applications
DevOps Engineer
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Technical
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medium
Explain the role of a Service Mesh (like Istio or Linkerd). What specific problems does it solve, and what overhead does it introduce?
#Service Mesh
#Microservices
#mTLS
#Traffic Management
DevOps Engineer
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Technical
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hard
How would you design a disaster recovery plan for a cloud-native LLM application relying heavily on managed cloud services (e.g., Azure Cosmos DB, Blob Storage)?
#Disaster Recovery
#Azure
#RTO/RPO
#High Availability
Difficulty Radar
Based on recent AI-sourced data.
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The "Standard" Interviewer
Senior EngineerFocuses on core competencies, system constraints, and clear communication.
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Think Out Loud
Always explain your thought process before writing code or drawing architecture.