DevCerts
Best practices, practical recommendations, and relevant updates on certification, exam preparation, public verification, and professional credibility for developers and IT teams.
Recent articles
Connection pools protect latency only when they are sized against the database, not against application traffic. In Go services, `database/sql`, `pgx`, PgBouncer, timeouts, transactions, and deadlocks must be treated as one production system.
Go is not automatically the right backend language, but it becomes hard to ignore when runtime behavior, concurrency, deployment simplicity, and long-lived services matter more than framework speed or ecosystem familiarity.
A production webhook endpoint is not just another controller action. In PHP applications, safe webhook handling means verifying signatures, responding fast, retrying deliberately, and making every event idempotent.
React escapes a lot by default, but production security failures usually happen at the edges: token storage, unsafe HTML rendering, weak CSP, and unreviewed npm dependencies. This article turns those risks into practical engineering decisions.
Laravel profiling is not about collecting every possible event. It is about choosing the right level of visibility for the question you need to answer: local debugging, aggregate performance trends, or production incident analysis.
Many Vue performance issues are not caused by slow rendering alone. They come from oversized reactive graphs, uncontrolled watchers, and computed properties that hide expensive work or trigger circular updates.
TypeScript starts paying off in large projects when teams stop treating types as decoration and use them to protect boundaries: API contracts, DTOs, shared models, and gradual migration from JavaScript.
When a PostgreSQL-backed application “freezes”, the database server is often healthy. The real problem is usually concurrency: long transactions, row locks, migration locks, or deadlocks turning normal requests into lock wait chains.
Go makes concurrency cheap, but not free. In production services, leaked goroutines, ignored contexts, and unbounded retries often show up as memory growth, hanging requests, noisy shutdowns, and incidents that are hard to reproduce locally.
Slow Python API endpoints are rarely caused by Python alone. The real causes usually sit at the boundaries: fake async code, blocking calls inside event loops, exhausted database pools, inefficient ORM queries, and expensive JSON serialization.
Most Kubernetes pod failures are not mysterious once you separate symptoms from causes. This guide explains CrashLoopBackOff, OOMKilled, ImagePullBackOff, logs, events, and probes through a practical diagnosis workflow.
Complex Vue forms become hard to maintain when validation, dynamic fields, autosave, and dirty tracking are scattered across components. A production-ready approach treats the form as a structured state model with explicit rules, reusable field adapters, and predictable side effects.