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10 Specs
API & Backend
Intermediate
Production-Ready REST API (Express)
Error handling, Zod validation, rate limiting, CORS, and structured logging
API & Backend
Intermediate
GraphQL API with Apollo Server
Schema, resolvers, context, dataloaders, and error handling
API & Backend
Intermediate
tRPC End-to-End Type Safety
tRPC router, procedures, React Query integration, and error handling
API & Backend
Advanced
Secure Webhook Handler
Signature verification, idempotency, retry handling, and queue processing
API & Backend
Intermediate
API Rate Limiting Strategies
Token bucket, sliding window, Redis-backed, and per-user limits
API & Backend
Intermediate
File Upload to S3/R2
Presigned URLs, multipart upload, progress tracking, and file validation
API & Backend
Intermediate
Background Jobs with BullMQ
Queue setup, workers, retries, job scheduling, and monitoring dashboard
API & Backend
API & Backend
Intermediate
Real-Time Updates with SSE
EventSource API, reconnection, broadcasting, and Express/Fastify SSE
API & Backend
Intermediate
WebSocket Chat with Socket.io
Rooms, namespaces, auth middleware, reconnection, and scaling
API & Backend