| text,label |
| How do I print hello world in Python?,simple |
| explain tcp handshake simply,simple |
| How do I reverse a string in JS?,simple |
| whats git stash do,simple |
| Difference between == and === in JavaScript,simple |
| How to check python version in terminal,simple |
| What is a null pointer?,simple |
| Convert celsius to fahrenheit formula,simple |
| What does HTTP 404 mean?,simple |
| What is the use of a .gitignore file?,simple |
| How to exit vim lol,simple |
| What is a REST API?,simple |
| what does async mean in programming,simple |
| How to declare a variable in Go?,simple |
| What's the difference between RAM and ROM?,simple |
| How to install a package with pip,simple |
| What does CRUD stand for,simple |
| What is a boolean?,simple |
| How to copy a file in Linux,simple |
| What does the break statement do,simple |
| Explain how a for loop works with an example,simple |
| What are environment variables and how do I use them,simple |
| How does version control help in team projects,simple |
| Explain recursion with a simple example,simple |
| What is the difference between a process and a thread?,simple |
| How does HTTPS differ from HTTP,simple |
| Explain what a hash function does,simple |
| What is the MVC pattern? simple explanation please,simple |
| How does caching improve performance,simple |
| What is a CDN and when would I use one,simple |
| Explain promises in JavaScript to a beginner,simple |
| how does binary search work,simple |
| Write a Python function to check if a number is prime,simple |
| Show me how to do basic list comprehension in Python,simple |
| Write a simple REST endpoint in Flask,simple |
| How to read a CSV file in Python with pandas,simple |
| Create a simple to-do list app in React,simple |
| How to connect to a SQLite database in Python,simple |
| How to center a div in CSS,simple |
| Make a simple HTTP GET request in Python,simple |
| Write regex to validate an email address,simple |
| How to merge two dictionaries in Python 3,simple |
| Show a basic Docker build and run flow,simple |
| How do I sort a list of objects by a field in Python,simple |
| Write a basic unit test in Jest,simple |
| How to use environment variables in a Node app,simple |
| "My recursive DFS crashes after several calls, help debug",medium |
| "I'm getting a CORS error in my React app, how to fix",medium |
| How do I handle race conditions in concurrent Python code,medium |
| What's the best way to paginate a large dataset in SQL,medium |
| "My API response times are slow, where should I start debugging",medium |
| Explain the CAP theorem with practical examples,medium |
| How to implement JWT authentication in Express,medium |
| Whats the diff between optimistic and pessimistic locking,medium |
| How to do zero-downtime deployments for a web service,medium |
| Best practices for error handling in async Node.js code,medium |
| How to profile a slow Python script,medium |
| Explain database normalization up to 3NF with examples,medium |
| How do I avoid memory leaks in a long-running Node process,medium |
| walk me through setting up CI/CD for a small team,medium |
| How does connection pooling work and when should I use it,medium |
| What are the tradeoffs between monorepo and polyrepo setups,medium |
| Explain event-driven architecture to someone new to it,medium |
| What's the difference between horizontal and vertical scaling,medium |
| How to implement a basic pub-sub system from scratch,medium |
| How to do blue-green deployments without breaking users,medium |
| whats the time complexity of quicksort,medium |
| Explain the difference between BFS and DFS,medium |
| How does a load balancer decide which server to route to,medium |
| Explain backpressure in streaming pipelines,medium |
| What is write-ahead logging in databases,medium |
| How does MVCC work in Postgres,medium |
| Explain the fan-out problem in social feeds,medium |
| What are the tradeoffs of a microservices vs monolith,medium |
| How does consensus work in distributed systems briefly,medium |
| What is tail latency and why does it matter,medium |
| How does a LRU cache work internally,medium |
| Help me pick between SQL and graph DB for a social network app,medium |
| Review this database schema and tell me what's wrong with it,medium |
| Should I use a queue or a database for this job processing use case,medium |
| Walk me through best practices for secrets management,medium |
| What's the right way to handle distributed tracing in my services,medium |
| Design a distributed recommendation system with failure recovery strategies,complex |
| How would you architect a multi-tenant SaaS platform with strict data isolation,complex |
| Design a system to handle 100k concurrent WebSocket connections reliably,complex |
| Create a comprehensive ML pipeline for training and serving large language models in production,complex |
| How would you build a search engine from scratch that handles typos and semantic similarity,complex |
| Design an event sourcing system with CQRS that handles audit logs and replay,complex |
| Architect a payment processing system with idempotency and exactly-once semantics,complex |
| Design a distributed job scheduling system that handles priorities and retries at scale,complex |
| Build a feature store architecture for real-time and batch ML feature serving,complex |
| How do I build a horizontally scalable notification system for billions of users,complex |
| Design a content delivery system that handles surges from viral content,complex |
| Create a multi-region database replication strategy with minimal lag and failover,complex |
| What are the main challenges with distributed transactions and how do teams solve them,complex |
| Explain the design decisions behind a modern column-store database,complex |
| How do large-scale recommendation systems handle cold start problems,complex |
| What are the engineering tradeoffs of building your own service mesh vs using an existing one,complex |
| How do you design an ML system that can detect data drift in production,complex |
| Describe the architecture of a high-availability storage system with erasure coding,complex |
| What makes building multi-tenant ML inference systems hard and how do teams do it,complex |
| How do you build a rate limiter that works correctly across multiple nodes,complex |
| What are the tradeoffs in designing a log-structured merge-tree storage engine,complex |
| How does a modern stream processing system handle late-arriving data correctly,complex |
| Design a cache eviction strategy for a system with wildly varying access patterns,complex |
| Help me plan a migration from a monolith to services without downtime,complex |
| Review my ML model serving architecture and find the bottlenecks,complex |
| Help me design observability for a system with 50 interdependent services,complex |
| My system has unpredictable latency spikes under load. help me figure out why,complex |
| Build a live chat feature that shows typing indicators in real time,medium |
| How do I push live price updates to thousands of users simultaneously,complex |
| How to build a live dashboard that refreshes every second without overloading the server,medium |
| Implement a collaborative whiteboard where multiple users draw at the same time,complex |
| How do I stream AI responses token by token to the frontend,medium |
| What's the best way to handle live GPS tracking for a delivery app,medium |
| How to implement live autocomplete suggestions as user types,simple |
| design a pub-sub system for live sports score updates,medium |
| How do I schedule a daily ML model retraining job,medium |
| I need to backfill 2 years of historical data into a new table,medium |
| How to generate PDF reports for 100k users in the background,medium |
| Build an ETL pipeline that runs nightly to sync two databases,medium |
| How to batch-send email newsletters to a million subscribers efficiently,medium |
| "My model's accuracy is dropping in production, where do I start",medium |
| How do I version datasets for reproducible ML training,medium |
| Explain the difference between online and batch feature engineering,medium |
| How do I set up A/B testing for two versions of an ML model,medium |
| What's the best way to serve a PyTorch model with low latency,medium |
| How to detect when my training data starts to look different from prod data,complex |
| What should my ML model CI/CD pipeline include,medium |
| How do I handle class imbalance in a production fraud model,medium |
| Build a simple model registry from scratch,medium |
| How to roll back a bad model deployment safely,medium |
| Summarize recent approaches to reducing LLM hallucinations,complex |
| What are the current state-of-the-art methods for time series forecasting,complex |
| Compare different approaches to vector similarity search at scale,medium |
| What are the known failure modes of transformer-based models,medium |
| What does the research say about the effectiveness of chain-of-thought prompting,medium |
| Summarize the tradeoffs of different approximate nearest neighbor algorithms,medium |
| What's the current thinking on retrieval-augmented generation vs fine-tuning,complex |
| What are the main approaches to neural architecture search,complex |
| what language should I learn first as a beginner,simple |
| i dont understand what a variable is can you explain,simple |
| "what is a function in programming, explain like im 10",simple |
| confused about what an IDE is,simple |
| how does the internet actually work at a high level,simple |
| can you explain what a server is in simple terms,simple |
| difference between frontend and backend for a beginner,simple |
| what does it mean when code throws an exception,simple |
| what is an algorithm in plain english,simple |
| "i keep seeing JSON everywhere, what is it",simple |
| my app keeps crashing randomly and I have no idea why,medium |
| things are working locally but broken in prod,medium |
| "users are complaining the app is slow, what do I check",medium |
| "I want my system to handle more traffic, where do I start",medium |
| something in my pipeline is failing silently and I cant find it,medium |
| I think theres a memory leak but im not sure how to confirm,medium |
| "my build times are getting really long, any ideas",medium |
| "we're seeing weird behavior only on Tuesdays, what could cause that",complex |
| my service works fine for 1000 users but breaks at 10k,complex |
| i need to make this faster but dont know where the bottleneck is,medium |
| the tests pass locally but fail in CI,medium |
| "I need to start from scratch on the backend, any advice",medium |
| "I'm overwhelmed by all the infra options, how do I choose",medium |
| k8s vs docker compose for small team,medium |
| async vs sync quick explanation,simple |
| best db for high write throughput?,medium |
| tf is a sidecar container,simple |
| diff btwn put and patch in REST,simple |
| pg vs mysql for 2025 project,simple |
| how 2 make docker container smaller,simple |
| whats service mesh tho,medium |
| lambda vs ec2 for event processing,medium |
| sql joins quick ref plz,simple |
| should i use nosql or sql???,medium |
| how often shud i commit to git lol,simple |
| How do I set up a load balancer for a Node app on a single cloud provider,medium |
| What's a good container resource request/limit strategy for variable workloads,medium |
| How do I set up auto-scaling that doesn't overreact to short spikes,medium |
| Walk me through setting up a basic VPC with public and private subnets,medium |
| How to manage infrastructure changes safely across multiple environments,medium |
| How do I reduce cold start time for serverless functions,medium |
| What's involved in running a multi-region active-active setup,complex |
| Set up a service that auto-scales based on queue depth,complex |
| This async function returns before the data is ready sometimes,medium |
| "My database writes are way slower than reads, what's going on",medium |
| My service mesh is dropping about 2% of requests silently,complex |
| I have a Heisenbug that disappears when I add logging,complex |
| Memory usage grows by 10MB every hour in my Java service,complex |
| This race condition only happens in prod under high load,complex |
| How do I implement debounce in vanilla JavaScript,simple |
| Write a generic binary search tree in TypeScript,medium |
| Write a parser for a simple expression language,complex |
| Implement consistent hashing in Go,complex |
| Show me how to write a custom React hook for pagination,medium |
| Write a middleware that logs every request and response,simple |
| Implement a simple in-memory LRU cache in Python,medium |
| How to write a CLI tool in Go with flags and subcommands,medium |
| Write a function that retries an async operation with jitter,medium |
| Show me how to do pagination with cursor-based approach in GraphQL,medium |
| Write a simple distributed lock using Redis primitives,complex |
| What factors should I weigh when choosing a message broker,medium |
| "How do teams manage config across dev, staging, and prod",medium |
| What are the tradeoffs of server-side vs client-side rendering,medium |
| What's the difference between circuit breaker and retry patterns,medium |
| How to model hierarchical data in a relational database,medium |
| When should I use a graph database instead of a relational one,medium |
| How do I implement full-text search without an external service,medium |
| How do I measure the latency of each service call in my stack,medium |
| How do I reduce API response time from 800ms to under 200ms,complex |
| How to safely run database migrations with millions of rows in prod,complex |
| What are the hardest parts of building a reliable job queue,complex |
| How to implement soft deletes and why it gets complicated,medium |
| How do I build multi-language support into my app from the start,medium |
| What are common GDPR compliance considerations for a SaaS app,medium |
| How to structure feature permissions for a role-based system,medium |
| How do teams handle long-running transactions safely,complex |
| Explain the saga pattern for distributed business transactions,complex |
| How do I profile and reduce cold starts in a containerized environment,complex |
| What's the deal with linear vs append-only data structures,medium |
| What's the tradeoff between normalization and query performance,medium |
| How to design an API that can evolve without breaking clients,medium |
| Build a data pipeline that handles schema changes gracefully,complex |
| How do large teams coordinate on a shared database schema,complex |
| What are signs that a monolith is ready to be broken up,medium |
| What are the practical gotchas of running containers in production,medium |
| How do you calculate the right timeout values for service calls,medium |
| What's a sensible default observability stack for a new service,medium |
| How do I model financial transactions to avoid double-spend issues,complex |
| What does a healthy on-call rotation look like for a small team,simple |
| How do embedding models differ from generative models,medium |
| What are practical ways to reduce inference cost for an LLM app,complex |
| How do you do canary deployments for ML models specifically,complex |
| What is quantization and does it hurt model quality much,medium |
| what is a transformer architecture in one paragraph,simple |
| How do I pick the right embedding dimension for my use case,medium |
| How do I check if a key exists in a Python dict,simple |
| What does the yield keyword do in Python,simple |
| How to check disk usage on Linux,simple |
| What is a constructor in OOP,simple |
| How do I pass command line args to a Python script,simple |
| What does idempotent mean in APIs,simple |
| How to make a GET request with curl,simple |
| How to format a date in Python,simple |
| How to flatten a nested list in Python,simple |
| What is port forwarding,simple |
| What is SSH and how does it work simply,simple |
| What does it mean to serialize data,simple |
| How to convert JSON to a Python dict,simple |
| What is the purpose of a package.json file,simple |
| How to run a shell command from Python,simple |
| What is method overloading,simple |
| How to read a file line by line in Python,simple |
| What is an abstract class,simple |
| What is a webhook,simple |
| How to swap two variables without a temp in Python,simple |
| What is a singleton pattern,simple |
| How to install npm packages globally,simple |
| What does TTL mean in networking,simple |
| How to generate a random number in Python,simple |
| What is a closure in JavaScript,simple |
| How do distributed systems handle network partitions,medium |
| What's the right way to handle long-running HTTP requests,medium |
| How do I mock database calls in Python unit tests,medium |
| Explain vector clocks and why they matter,medium |
| How does connection draining work in a load balancer,medium |
| How to do graceful shutdown of a web server,medium |
| When should you use a message queue vs direct API calls,medium |
| How do you implement search autocomplete efficiently,medium |
| How to detect and prevent SQL injection,medium |
| Explain the difference between eager and lazy loading,medium |
| How to handle long-polling vs webhooks vs SSE,medium |
| What strategies exist for handling API versioning,medium |
| What is change data capture and when would I use it,medium |
| How do I handle timezone-aware datetimes in Python correctly,medium |
| How to batch database writes without losing data,medium |
| How do I prevent data loss during a service restart,medium |
| What is the strangler fig pattern and when to use it,medium |
| How do I do canary releases for a REST API,medium |
| How to write idempotent database migrations,medium |
| How do I implement a distributed counter accurately,medium |
| Best practices for structuring a large SQL query,medium |
| How to handle long transactions that might timeout,medium |
| How would you design a globally consistent metadata store,complex |
| Explain the internals of a modern query optimizer,complex |
| Design a distributed rate limiter that works across data centers,complex |
| Architect a system that guarantees exactly-once delivery at scale,complex |
| How do you build a time-series database optimized for high cardinality,complex |
| Design the data model for a multi-tenant permission system at scale,complex |
| How do large-scale ML inference systems handle model versioning safely,complex |
| What are the challenges and solutions for live migrating stateful containers,complex |
| How do you design a distributed queue that handles backpressure gracefully,complex |
| How to build a cross-region active-active database with conflict resolution,complex |
| What's involved in building a low-latency high-throughput matching engine,complex |
| How do you prevent thundering herd in a distributed caching layer,complex |
| Explain how columnar compression works and affects query performance,complex |
| How would you build a fully auditable event log with tamper detection,complex |
| Design an adaptive routing system that handles heterogeneous backend capacity,complex |
| How to safely migrate a live system from eventual to strong consistency,complex |
| What are the deep performance considerations for building a JVM-based service,complex |
| Design a system for online learning where models update from live user feedback,complex |
| How do you build observability into a system that handles 1M events per second,complex |
| "Design a content moderation pipeline that handles text, images, and video at scale",complex |
| How would you build a distributed ID generation system with time ordering,complex |
| Design a real-time anomaly detection system for infrastructure metrics,complex |
| What are the tradeoffs of CRDT-based conflict resolution vs OT for collaborative apps,complex |
| How do you safely deprecate an internal API used by 30 downstream services,complex |
| How do you design a low-latency ad bidding system that handles 500k QPS,complex |
| Design an autoscaling inference cluster for multimodal AI models with cost controls,complex |
| How would you build a multi-cloud disaster recovery system with RPO under 1 minute,complex |
| Architect a real-time personalization engine for an e-commerce platform at scale,complex |
| How to architect a platform for running untrusted user code securely at scale,complex |
| Design a self-healing infrastructure system that detects and remediates issues autonomously,complex |
| How to build a horizontally scalable session management system with sub-millisecond lookup,complex |
| Design a large-scale data anonymization pipeline that preserves analytical utility,complex |
| Design a system to detect and mitigate DDoS attacks in real time without blocking legitimate users,complex |
| What is a namespace in programming,simple |
| How to create an empty array in JavaScript,simple |
| What is a heap in data structures,simple |
| What is a semaphore,simple |
| Whats the difference between i++ and ++i,simple |
| How to get current timestamp in Unix seconds in Python,simple |
| What is a race condition in one line,simple |
| How to check type of variable in Python,simple |
| What is the difference between deep copy and shallow copy,simple |
| Help me pick between a managed queue and a self-hosted broker for my use case,medium |
| What caching strategy makes sense for my read-heavy product catalog,medium |
| Review my API rate limiting approach and identify weaknesses,medium |
| How should I structure config management across 20 services,medium |
| Help me plan a database migration with minimal developer disruption,medium |
| What observability gaps do teams typically miss in their first production service,medium |
| How does Raft consensus algorithm actually work step by step,complex |
| Explain the internals of how a distributed hash table routes requests,complex |
| What are the deep tradeoffs in choosing between push vs pull architectures,complex |
| What are the failure modes of leader election in a distributed system,complex |
| Explain fencing tokens and why they matter for distributed locking,complex |
| How do modern databases maintain ACID guarantees without sacrificing throughput,complex |
| How does the Linux kernel handle context switching,medium |
| Explain how JIT compilation works at a high level,medium |
| What is copy-on-write and how is it used in OS design,medium |
| Explain how virtual memory paging works,medium |
| How do file system journaling and checksums protect against corruption,medium |
| What is a content negotiation in HTTP,simple |
| How to convert a dict to a sorted list of tuples in Python,simple |
| How do I set a timeout on a network call in Python,simple |
| What is the difference between INNER JOIN and LEFT JOIN,simple |
| What is the difference between TCP and UDP,simple |
| What is the Observer design pattern,simple |
| "Architect an end-to-end data lake with governance, lineage, and query federation",complex |
| Build a cross-cloud identity federation system with SSO and fine-grained permissions,complex |
| Architect a horizontal scaling strategy for a stateful multiplayer game backend,complex |
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