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What does PM2 do for Node.js applications?
PM2 restarts crashed processes and manages multiple workers.
Environment configuration and secrets management in Node.js?
Use environment variables, load from .env file (dev only), never commit secrets.
WebSocket optimization for high-frequency data?
Large payloads increase latency, frequent tiny messages waste overhead, solutions include compression, selective fields, and batching.
Cross-server Socket.IO communication in horizontal scaling?
Local io.emit() only reaches local sockets, need adapter (Redis) for inter-server broadcast.
How to sync state across multiple user devices?
Attach userId to each socket, track active sockets per user, broadcast user state to all their sockets.
How to authenticate WebSocket connections using JWTs?
Client sends JWT on connection, server validates via middleware, socket is attached to user.
How does Socket.IO handle WebSocket failures with fallbacks?
Transports are communication protocols, WebSocket is primary, long-polling is fallback, client auto-detects and downgrades.
How do Socket.IO rooms organize client communication?
Rooms group sockets for targeted broadcasting, socket can join multiple rooms, emit to room broadcasts to all members.
How to add Socket.IO to an Express application?
Create HTTP server with express(), attach Socket.IO to it, listen on server not app, define event handlers.
Socket.IO emit methods: socket, io, broadcast differences?
Socket.emit() sends to one client, broadcast.emit() to all except sender, io.emit() to all.
HTTP request-response versus WebSocket connections?
HTTP is request-initiated, pull-based, client waits for response. WebSocket is persistent, bidirectional, either side sends data anytime.
How do you handle errors across piped streams safely?
Pipe connects streams but errors don't auto-propagate, must listen on each stream. Use pipeline() helper for auto-cleanup.
postMessage vs SharedArrayBuffer in worker_threads tradeoffs?
Structured cloning copies data, SharedArrayBuffer shares memory.
How does Node.js cluster module enable zero-downtime restarts?
Master-worker architecture, graceful shutdown of old workers, routing new requests to new workers.
Fixing text overflow from long localized labels
Avoid fixed widths, use flexible layouts, allow wrapping or word-break, ellipsis as last resort, pseudo-localize to test.
Translating a Job Story into mobile features
Decompose situation, motivation, expected outcome; map commute constraints to offline, audio, quick-scan features.
Scaling one researcher across three squads
Triage by impact, enable democratized research with guardrails, build reusable templates and a shared repository.
Defining and instrumenting UX KPIs for a feature
Tie KPIs to user goals via a framework like HEART, define events before building, validate tracking pre-launch.
Tracing a research insight to shipped code
Give insights stable IDs, link them through tickets to commits and feature flags via tool integrations, measure outcome metrics.
Architecting a multi-tenant ResearchOps platform
Tenant isolation model, RBAC plus governance and classification, searchable metadata and a taxonomy for cross-team synthesis.