Mateo Rodriguez

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Posted Frontend: normalize and display server validation errors
Posted Vite env handling: explicit prefixes only
Posted Prettier config for consistent formatting
Posted ESLint config that avoids bikeshedding
Posted Next.js bundle analyzer for targeted performance work
Posted Response compression (only when it helps)
Posted Security headers with helmet (baseline hardening)
Posted Multipart upload streaming (busboy)
Posted SQL upsert for counters (ON CONFLICT DO UPDATE)
Posted Frontend: copy-to-clipboard with fallback
Posted Backend: normalize errors with a single Express handler
Posted Frontend: toast notifications via a small event bus
Posted Frontend: skeleton loading instead of spinners
Posted Batched writes with COPY (conceptual)
Posted Prisma: avoid N+1 with include/select
Posted SQL migration safety: add column nullable, backfill, then constrain
Posted GraphQL persisted queries (hash allowlist)
Posted tRPC router pattern for type-safe APIs
Posted Service worker: cache static assets safely
Posted Web Vitals reporting to an API endpoint
Posted Next.js middleware for auth gating
Posted React Hook Form + Zod resolver
Posted MSW for frontend API mocking in tests
Posted Email sending with nodemailer + templates
Posted Cron scheduling with node-cron (with guard)
Posted BullMQ job idempotency via dedupe id
Posted Partial index for “active” rows in Postgres
Posted Postgres advisory lock for one-at-a-time work
Posted Password reset tokens: hash + expiry
Posted JWT access + refresh token rotation (conceptual)
Posted CORS configuration that’s explicit (no *)
Posted ETag + conditional GET for read-heavy endpoints
Posted HTTP keep-alive agent for outbound calls
Posted HTTP client timeout with AbortController (fetch)
Posted Simple concurrency limiter for batch operations
Posted TypeScript path aliases (tsconfig + bundler)
Posted OpenAPI generation for REST endpoints
Posted N+1 avoidance with DataLoader (GraphQL)
Posted OAuth PKCE flow (high level helper)
Posted Password hashing with Argon2
Posted Sentry initialization with release + environment
Posted Typed env parsing with zod
Posted Accessible modal with focus trap
Posted IntersectionObserver infinite scroll hook
Posted Debounced search input (React)
Posted Exponential backoff with jitter for retries
Posted Circuit breaker wrapper for flaky third-party APIs
Posted Repository pattern for DB access (small, pragmatic)
Posted API input coercion for query params (Zod preprocess)
Posted Prisma transaction with retries for serialization errors
Posted Playwright smoke test for auth flow
Posted Testing Express routes with Supertest + Jest
Posted Health checks with readiness + liveness
Posted Docker multi-stage build for Next.js
Posted GitHub Actions: cache + tests + build
Posted API pagination response contract (page info)
Posted Feature flags with a typed registry
Posted Streaming CSV import (Node streams)
Posted Safe markdown rendering (remark + rehype)
Posted Sanitize user HTML safely (DOMPurify + JSDOM)
Posted Prometheus metrics for request latency
Posted API error shape that frontend can rely on
Posted Pre-signed S3 upload from the browser
Posted CSRF protection with double-submit cookie
Posted Content Security Policy headers (defense-in-depth)
Posted React Error Boundary + error reporting hook
Posted React Query optimistic update for likes
Posted Next.js Route Handler with auth guard
Posted WebSocket server with topic subscriptions (ws)
Posted SSE endpoint for server-to-browser events
Posted OpenTelemetry tracing for Node HTTP
Posted BullMQ worker with retries + dead-letter
Posted Transactional outbox in Node (DB write + event)
Posted Cursor-based pagination with stable ordering
Posted Rate limiting by IP + user (Express)
Posted Redis cache-aside for expensive reads
Posted Webhook signature verification (timing-safe compare)
Posted Idempotency keys for “create” endpoints
Posted Postgres connection pooling with pg + max lifetime
Posted Graceful shutdown for Node HTTP servers
Posted Runtime validation for request bodies (Zod)
Posted Request ID + structured logging (Express + pino)